{"id":105,"date":"2021-12-30T07:42:23","date_gmt":"2021-12-30T07:42:23","guid":{"rendered":"http:\/\/www.devblog.cn\/?p=105"},"modified":"2025-03-24T10:21:02","modified_gmt":"2025-03-24T02:21:02","slug":"jetpack-viewmodel%e6%ba%90%e7%a0%81%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"http:\/\/www.devblog.cn\/?p=105","title":{"rendered":"Jetpack-ViewModel\u6e90\u7801\u89e3\u6790"},"content":{"rendered":"

ViewModel\u6e90\u7801\u89e3\u6790<\/h1>\n

\n \u6e90\u7801\u7248\u672c\uff1a
\n * ViewModel<\/strong>\uff1a2.8.7
\n * androidx.activity:activity<\/strong>\uff1a1.10.1
\n * androidx.fragment:fragment<\/strong>\uff1a1.8.6
\n * \u66f4\u65b0\u65f6\u95f4<\/strong>\uff1a2025-3\u6708
\n * \u9700\u4f1a\u4f7f\u7528<\/strong>\uff1aLifecycle<\/code><\/p>\n

\u5bfc\u822a\uff1a<\/strong>
\n * Jetpack-Lifecycle\u6e90\u7801\u89e3\u6790<\/a>
\n * Jetpack-LiveData\u6e90\u7801\u89e3\u6790<\/a>
\n * Jetpack-ViewModel\u6e90\u7801\u8be6\u89e3<\/a>
\n * \u66f4\u591a\u7684\u6587\u7ae0\u770b\u8fd9\u91cc\uff1a\u4e3b\u9875<\/a>\n<\/p><\/blockquote>\n

\u4f7f\u7528<\/h1>\n

\u58f0\u660eViewModel<\/h2>\n
class MyViewModel : ViewModel() {\n\n    override fun onCleared() {\n        super.onCleared()\n    }\n}\n<\/code><\/pre>\n
\u83b7\u53d6ViewModel<\/h2>\n
class MyActivity : AppCompatActivity() {\n\n    override fun onCreate(savedInstanceState: Bundle?) {\n        \/\/ \u83b7\u53d6ViewModel\n        val viewModel = ViewModelProvider(this).get(MyViewModel::class.java)\n    }\n}\n<\/code><\/pre>\n
viewModels()\u6269\u5c55\u65b9\u6cd5<\/h2>\n
\/\/ Activity\nComponentActivity.viewModels()\n\/\/ Fragment\nFragment.viewModels()\nFragment.activityViewModels()\nFragment.createViewModelLazy()\n<\/code><\/pre>\n
\u589e\u52a0\u3001\u83b7\u53d6Closeable<\/h2>\n
val closeable = object : AutoCloseable {\n    override fun close() {\n        \/\/ ViewModel\u9500\u6bc1\u65f6\uff0c\u4f1a\u81ea\u52a8\u5148\u901a\u77e5\u6b64\u56de\u8c03\uff0c\u540e\u901a\u77e5ViewModel\u7684onCleared()\u56de\u8c03\u3002\n    }\n}\nviewModel.addCloseable(closeable) \/\/ \u589e\u52a0Closeable\nviewModel.addCloseable(key, closeable) \/\/ \u901a\u8fc7key\u589e\u52a0Closeable\uff0c\u5982\u679c\u6b64key\u4e4b\u524d\u5df2\u7ecf\u589e\u52a0Closeable\uff0c\u4ed6\u4f1a\u7acb\u5373\u901a\u77e5\u4e4b\u524d\u7684\u90a3\u4e2aAutoCloseable\u5173\u95ed\u3002\nval myCloseable = viewModel.getCloseable<AutoCloseable>(key) \/\/ \u901a\u8fc7key\u83b7\u53d6Closeable\n<\/code><\/pre>\n
ViewModel\u751f\u547d\u5468\u671f<\/h2>\n
\"enter<\/div><\/p>\n
\u5bf9\u5e94\u5173\u7cfb<\/h2>\n
    \n
  1. \u4eceandroidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u6e90\u7801\u5f97\u77e5\uff1a\u4e00\u4e2a<\/strong>androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u5bf9\u5e94\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\u3002<\/li>\n
  2. \u4eceViewModelStore<\/code>\u6e90\u7801\u5f97\u77e5\uff1a\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>ViewModel<\/code>\u3002<\/li>\n
  3. \u4eceViewModel<\/code>\u6e90\u7801\u5f97\u77e5\uff1a\u4e00\u4e2a<\/strong>ViewModel<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>AutoCloseable<\/code>\u3002<\/li>\n<\/ol>\n
    \u603b\u7ed3<\/strong>\uff1a\u4e00\u4e2a<\/strong>androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u5bf9\u5e94\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\uff0c\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>ViewModel<\/code>\uff0c\u4e00\u4e2a<\/strong>ViewModel<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>AutoCloseable<\/code>\u3002<\/p>\n
    \u6e90\u7801<\/h1>\n
    \u58f0\u660eViewModel<\/h2>\n
    ViewModel\u7c7b<\/strong><\/p>\n
    public actual abstract class ViewModel {\n\n    private val impl: ViewModelImpl?\n\n    public actual constructor() {\n        impl = ViewModelImpl()\n    }\n\n    public actual constructor(viewModelScope: CoroutineScope) {\n        impl = ViewModelImpl(viewModelScope)\n    }\n\n    public actual constructor(vararg closeables: AutoCloseable) {\n        impl = ViewModelImpl(*closeables)\n    }\n\n    public actual constructor(viewModelScope: CoroutineScope, vararg closeables: AutoCloseable) {\n        impl = ViewModelImpl(viewModelScope, *closeables)\n    }\n\n    @Deprecated(message = \"Replaced by `AutoCloseable` overload.\", level = DeprecationLevel.HIDDEN)\n    public constructor(vararg closeables: Closeable) {\n        impl = ViewModelImpl(*closeables)\n    }\n\n    \/\/ \u5f53ViewModel\u88ab\u6e05\u9664\u65f6\u8c03\u7528\n    protected actual open fun onCleared() {}\n\n    @MainThread\n    internal actual fun clear() {\n        impl?.clear()\n        \/\/ \u901a\u77e5\n        onCleared()\n    }\n\n    public actual fun addCloseable(key: String, closeable: AutoCloseable) {\n        impl?.addCloseable(key, closeable)\n    }\n\n    \/\/ \u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684Closeable\u5bf9\u8c61\uff0c\u5b83\u5c06\u5728ViewModel.onCleared()\u88ab\u8c03\u7528\u4e4b\u524d\u88ab\u76f4\u63a5\u5173\u95ed\u3002\n    \/\/ \u5982\u679conCleared()\u5df2\u7ecf\u88ab\u8c03\u7528\uff0ccloseable\u5c06\u4e0d\u4f1a\u88ab\u6dfb\u52a0\uff0c\u800c\u662f\u7acb\u5373\u88ab\u5173\u95ed\u3002\n    public actual open fun addCloseable(closeable: AutoCloseable) {\n        impl?.addCloseable(closeable)\n    }\n\n    @Deprecated(message = \"Replaced by `AutoCloseable` overload.\", level = DeprecationLevel.HIDDEN)\n    public open fun addCloseable(closeable: Closeable) {\n        impl?.addCloseable(closeable)\n    }\n\n    public actual fun <T : AutoCloseable> getCloseable(key: String): T? = impl?.getCloseable(key)\n}\n<\/code><\/pre>\n
    \u6211\u4eec\u63a5\u4e0b\u6765\uff0c\u770b\u4e00\u4e0bAutoCloseable<\/code>\u63a5\u53e3\u3002<\/p>\n
    public interface AutoCloseable {\n\n    void close() throws Exception;\n}\n<\/code><\/pre>\n
    ViewModel<\/code>\u7c7b\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u4ed6\u7684\u6240\u6709\u5b9e\u73b0\u90fd\u662f\u7531\u4ed6\u7684\u5b9e\u73b0\u7c7bViewModelImpl<\/code>\u5b9e\u73b0\u7684\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0bViewModelImpl<\/code>\u7c7b\u3002<\/p>\n
    \n  \u8bf4\u660e\uff1a<\/p>\n
      \n
    1. AutoCloseable<\/code>\u63a5\u53e3\uff0c\u4e3a\u5728ViewModel<\/code>\u9500\u6bc1<\/strong>\u65f6\u4f1a\u81ea\u52a8\u5173\u95ed<\/strong>\uff08\u8c03\u7528close()<\/code>\uff09\u3002<\/li>\n
    2. ViewModel<\/code>\u6784\u9020\u65b9\u6cd5<\/strong>\uff0c\u53ef\u4ee5\u6307\u5b9aCoroutineScope<\/code>\u3002<\/li>\n
    3. ViewModel<\/code>\u6784\u9020\u65b9\u6cd5<\/strong>\u3001addCloseable()<\/code>\u3001getCloseable()<\/code>\uff0c\u53ef\u4ee5\u6dfb\u52a0\u83b7\u53d6<\/strong>AutoCloseable<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
      internal class ViewModelImpl {\n\n    \/\/ \u9501\n    private val lock = SynchronizedObject()\n\n    \/\/ \u6709key\u7684AutoCloseable\u96c6\u5408\uff0c\u4fdd\u5b58\u4e0e\u6b64ViewModel\u5173\u8054\u7684String\u952e\u548cAutoCloseable\u8d44\u6e90\u4e4b\u95f4\u7684\u6620\u5c04\u3002\n    \/\/ \u5728ViewModel.onCleared()\u88ab\u8c03\u7528\u4e4b\u524d\uff0c\u76f8\u5173\u7684\u8d44\u6e90\u5c06\u88abAutoCloseable.close()\u3002\u8fd9\u5728ViewModel\u53d1\u5e03\u65f6\u63d0\u4f9b\u4e86\u81ea\u52a8\u7684\u8d44\u6e90\u6e05\u7406\u3002\n    private val keyToCloseables = mutableMapOf<String, AutoCloseable>()\n\n    \/\/ \u65e0key\u7684AutoCloseable\u96c6\u5408\n    private val closeables = mutableSetOf<AutoCloseable>()\n\n    \/\/ \u6807\u8bb0\u662f\u5426\u662f\u5df2\u6e05\u9664\n    @Volatile\n    private var isCleared = false\n\n    constructor()\n\n    constructor(viewModelScope: CoroutineScope) {\n        \/\/ \u6dfb\u52a0\u5230\u6709key\u7684AutoCloseable\u96c6\u5408\uff0c\u5e76\u628aviewModelScope\u8f6c\u4e3aAutoCloseable\uff08\u4f1a\u5728\u5173\u95ed\u65f6\uff0c\u81ea\u52a8\u53d6\u6d88\u6b64\u4f20\u5165\u7684viewModelScope\uff09\u3002\n        addCloseable(VIEW_MODEL_SCOPE_KEY, viewModelScope.asCloseable())\n    }\n\n    constructor(vararg closeables: AutoCloseable) {\n        \/\/ \u6dfb\u52a0\u5230\u65e0key\u7684AutoCloseable\u96c6\u5408\n        this.closeables += closeables\n    }\n\n    constructor(viewModelScope: CoroutineScope, vararg closeables: AutoCloseable) {\n        \/\/ \u540c\u65f6\u64cd\u4f5c\u4e0a\u97622\u4e2a\n        addCloseable(VIEW_MODEL_SCOPE_KEY, viewModelScope.asCloseable())\n        this.closeables += closeables\n    }\n\n    @MainThread\n    fun clear() {\n        if (isCleared) return \/\/ \u5df2\u7ecf\u6e05\u9664\uff0c\u518d\u6e05\u9664\u5219\u76f4\u63a5\u8fd4\u56de\u3002\n\n        \/\/ \u6807\u8bb0\u5df2\u7ecf\u6e05\u9664\n        isCleared = true\n        \/\/ \u52a0\u9501\uff0c\u4fdd\u8bc1\u53ea\u80fd\u5355\u7ebf\u7a0b\u8fdb\u3002\n        synchronized(lock) {\n            \/\/ \u901a\u77e5\u5173\u95edkeyToCloseables\u7684\u6240\u6709\n            for (closeable in keyToCloseables.values) {\n                \/\/ \u901a\u77e5\u6b64closeable\u5173\u95ed\n                closeWithRuntimeException(closeable)\n            }\n            \/\/ \u901a\u77e5\u5173\u95edcloseables\u7684\u6240\u6709\n            for (closeable in closeables) {\n                closeWithRuntimeException(closeable)\n            }\n            \/\/ \u53ea\u6e05\u9664\u6ca1\u6709\u952e\u7684\u8d44\u6e90\uff0c\u4ee5\u9632\u6b62\u8d44\u6e90\u7684\u610f\u5916\u91cd\u65b0\u521b\u5efa\u3002\u4f8b\u5982\uff0cviewModelScope\u5c06\u88ab\u91cd\u65b0\u521b\u5efa\uff0c\u4ece\u800c\u5bfc\u81f4\u610f\u5916\u884c\u4e3a\u3002\n            \/\/ \u6e05\u7a7acloseables\n            closeables.clear()\n        }\n    }\n\n    \/\/ \u6dfb\u52a0\u5230\u6709key\u7684AutoCloseable\u96c6\u5408\uff0c\u65b9\u4fbf\u540e\u7eed\u83b7\u53d6\u3002\u5982\u679c\u6b64key\u4e4b\u524d\u5df2\u7ecf\u6709\u4e86\uff0c\u4ed6\u4f1a\u7acb\u5373\u901a\u77e5\u4e4b\u524d\u7684\u90a3\u4e2aAutoCloseable\u7acb\u5373\u5173\u95ed\u3002\n    fun addCloseable(key: String, closeable: AutoCloseable) {\n        \/\/ \u5c3d\u7ba1\u5728\u7528\u6237\u8c03\u7528onCleared()\u4e4b\u540e\u4e0d\u5e94\u8be5\u505a\u4efb\u4f55\u903b\u8f91\u64cd\u4f5c\uff0c\u4f46\u6211\u4eec\u786e\u4fdd\u5982\u679c\u5b83\u5df2\u7ecf\u88ab\u8c03\u7528\uff0c\u5c1d\u8bd5\u5c06\u6dfb\u52a0\u7684closeable\u7acb\u5373\u5173\u95ed\uff0c\u4ee5\u786e\u4fdd\u4e0d\u4f1a\u6709\u6cc4\u6f0f\u3002\n        if (isCleared) {\n            \/\/ \u5df2\u7ecf\u6e05\u9664\uff0c\u76f4\u63a5\u901a\u77e5closeable\u5173\u95ed\uff0c\u5e76\u8fd4\u56de\u3002\n            closeWithRuntimeException(closeable)\n            return\n        }\n\n        \/\/ \u6dfb\u52a0\u5230\u6709key\u7684AutoCloseable\u96c6\u5408\uff0c\u5982\u679c\u6b64key\u4e4b\u524d\u5df2\u7ecf\u6709\u4e86\uff0c\u4ed6\u4f1a\u7acb\u5373\u901a\u77e5\u4e4b\u524d\u7684\u90a3\u4e2aAutoCloseable\u7acb\u5373\u5173\u95ed\u3002\n        val oldCloseable = synchronized(lock) { keyToCloseables.put(key, closeable) }\n        closeWithRuntimeException(oldCloseable)\n    }\n\n    \/\/ \u6dfb\u52a0\u5230\u65e0key\u7684AutoCloseable\u96c6\u5408\n    fun addCloseable(closeable: AutoCloseable) {\n        \/\/ \u540c\u4e0a\n        if (isCleared) {\n            closeWithRuntimeException(closeable)\n            return\n        }\n\n        \/\/ \u6dfb\u52a0\u5230\u65e0key\u7684AutoCloseable\u96c6\u5408\uff0c\u7531\u4e8e\u6b64\u96c6\u5408\u662fSet\u96c6\u5408\uff0c\u6240\u4ee5\u76f8\u540c\u7684closeable\u518d\u6b21\u6dfb\u52a0\uff0c\u5219\u4e0d\u4f1a\u6dfb\u52a0\u3002\n        synchronized(lock) { closeables += closeable }\n    }\n\n    \/\/ \u83b7\u53d6\u6b64key\u5bf9\u5e94\u7684AutoCloseable\uff0c\u4ece\u6709key\u7684AutoCloseable\u96c6\u5408\u4e2d\u83b7\u53d6\uff0c\u5982\u679c\u6ca1\u6709\u5219\u4e3a\u7a7a\u3002\n    fun <T : AutoCloseable> getCloseable(key: String): T? =\n        @Suppress(\"UNCHECKED_CAST\")\n        synchronized(lock) { keyToCloseables[key] as T? }\n\n    \/\/ \u901a\u77e5\u53c2\u6570closeable\u5173\u95ed\n    private fun closeWithRuntimeException(closeable: AutoCloseable?) {\n        try {\n            \/\/ \u901a\u77e5\u5173\u95ed\n            closeable?.close()\n        } catch (e: Exception) {\n            throw RuntimeException(e)\n        }\n    }\n}\n<\/code><\/pre>\n
      ViewModelImpl<\/code>\u7c7b\uff0c\u662fViewModel<\/code>\u5b9e\u73b0\u7c7b\uff0c\u5176\u5185\u90e8\u7ef4\u62a4\u4e862\u4e2aAutoCloseable<\/code>\u96c6\u5408\u3002<\/p>\n
      \u5c0f\u7ed3<\/h3>\n
      \n  \u8bf4\u660e\uff1a<\/p>\n
        \n
      1. ViewModel<\/code>\uff1a\u4e3aView<\/code>\u5c42\u63d0\u4f9b\u6570\u636e\uff0c\u53ef\u5728\u914d\u7f6e\u53d8\u66f4<\/strong>\u540e\u4fdd\u6301\u76f8\u5e94\u72b6\u6001\u3002<\/li>\n
      2. AutoCloseable<\/code>\u63a5\u53e3\uff1a\u4f1a\u5728ViewModel<\/code>\u9500\u6bc1<\/strong>\u65f6\uff0c\u4f1a\u81ea\u52a8\u6536\u5230\u5173\u95ed\u901a\u77e5<\/strong>\uff08\u8c03\u7528close()<\/code>\uff09\u3002<\/li>\n
      3. \u5173\u7cfb<\/strong>\uff1a\u4e00\u4e2a<\/strong>ViewModel<\/code>\uff0c\u5bf9\u5e94\u591a\u4e2a<\/strong>AutoCloseable<\/code>\u3002<\/li>\n
      4. CoroutineScope<\/code>\uff1aViewModel<\/code>\u6784\u9020\u65b9\u6cd5<\/strong>\uff0c\u53ef\u4ee5\u6307\u5b9aCoroutineScope<\/code>\u3002<\/li>\n
      5. AutoCloseable<\/code>\uff1aViewModel<\/code>\u6784\u9020\u65b9\u6cd5<\/strong>\u3001addCloseable()<\/code>\u3001getCloseable()<\/code>\uff0c\u53ef\u4ee5\u6dfb\u52a0\u83b7\u53d6<\/strong>AutoCloseable<\/code>\u3002<\/li>\n
      6. ViewModel<\/code>\u7684clear()<\/code> \u65b9\u6cd5\uff0c\u4f1a\u5148\u901a\u77e5<\/strong>\u6240\u6709AutoCloseable<\/code>\u5173\u95ed<\/strong>\uff0c\u7136\u540e\u518d\u901a\u77e5<\/strong>ViewModel<\/code>\u7684onCleared()<\/code>\u56de\u8c03\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
        \u83b7\u53d6ViewModel<\/code>\uff0c\u662f\u901a\u8fc7ViewModelProvider(this).get(MyViewModel::class.java)<\/code>\u83b7\u53d6\u7684\uff0c\u6211\u4eec\u5148\u6765\u770bViewModelProvider<\/code>\u7684\u521b\u5efa<\/strong>\uff0c\u7136\u540e\u518d\u6765\u770b\u5176get()<\/code>\u65b9\u6cd5\u83b7\u53d6\u3002<\/p>\n
        \u521b\u5efaViewModelProvider<\/h2>\n
        new\u521b\u5efa<\/h3>\n
        public actual open class ViewModelProvider private constructor(\n    private val impl: ViewModelProviderImpl,\n) {\n\n    \/\/ \u4ee5\u4e0b\u4e24\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u90fd\u662f\u8c03\u7528\u7684\u6b64\u6784\u9020\u65b9\u6cd5\uff0c\u800c\u6b64\u6784\u9020\u65b9\u6cd5\u53c8\u662f\u8c03\u7528\u7684\u4e0a\u9762\u7684\u4e3b\u6784\u9020\u65b9\u6cd5\u3002\n    @JvmOverloads\n    public constructor(\n        store: ViewModelStore,\n        factory: Factory,\n        defaultCreationExtras: CreationExtras = CreationExtras.Empty,\n    ) : this(ViewModelProviderImpl(store, factory, defaultCreationExtras))\n\n    public constructor(\n        owner: ViewModelStoreOwner,\n    ) : this(\n        store = owner.viewModelStore,\n        factory = ViewModelProviders.getDefaultFactory(owner),\n        defaultCreationExtras = ViewModelProviders.getDefaultCreationExtras(owner)\n    )\n\n    public constructor(\n        owner: ViewModelStoreOwner,\n        factory: Factory,\n    ) : this(\n        store = owner.viewModelStore,\n        factory = factory,\n        defaultCreationExtras = ViewModelProviders.getDefaultCreationExtras(owner)\n    )\n}\n<\/code><\/pre>\n
        ViewModelProvider<\/code>\u7c7b\u7684\u521b\u5efa<\/strong>\uff0c\u9700\u8981\u521b\u5efaViewModelProviderImpl<\/code>\u7c7b\uff0c\u800cViewModelProviderImpl<\/code>\u7c7b\u7684\u521b\u5efa<\/strong>\u9700\u8981ViewModelStore<\/code>\u3001ViewModelProvider.Factory<\/code>\u3001CreationExtras<\/code>\u3002<\/p>\n
        \n  \u8bf4\u660e\uff1a<\/p>\n
          \n
        1. ViewModelProviderImpl<\/code>\uff1a\u4ed6\u662fViewModelProvider<\/code>\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u5176\u5185\u90e8\u7684get()<\/code>\u65b9\u6cd5\u5c31\u662f\u8c03\u7528\u7684\u6b64\uff0c\u8be6\u7ec6\u770b\u540e\u9762\u7684-\u83b7\u53d6ViewModel<\/strong>\u3002<\/li>\n
        2. ViewModelStore<\/code>\uff1a\u53ef\u4ee5\u4eceViewModelStoreOwner<\/code>\u4e2d\u83b7\u53d6\u3002<\/li>\n
        3. ViewModelProvider.Factory<\/code>\uff1a\u672a\u6307\u5b9a\uff0c\u5219\u9ed8\u8ba4<\/strong>\u4e3aViewModelProviders.getDefaultFactory(owner)<\/code>\u3002<\/li>\n
        4. CreationExtras<\/code>\uff1a\u672a\u6307\u5b9a\uff0c\u5219\u9ed8\u8ba4<\/strong>\u4e3aViewModelProviders.getDefaultCreationExtras(owner)<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
          create\u521b\u5efa<\/h3>\n
          public actual companion object {\n    @JvmStatic\n    @Suppress(\"MissingJvmstatic\")\n    public actual fun create(\n        owner: ViewModelStoreOwner,\n        factory: Factory,\n        extras: CreationExtras,\n    ): ViewModelProvider = ViewModelProvider(owner.viewModelStore, factory, extras)\n\n    @JvmStatic\n    @Suppress(\"MissingJvmstatic\")\n    public actual fun create(\n        store: ViewModelStore,\n        factory: Factory,\n        extras: CreationExtras\n    ): ViewModelProvider = ViewModelProvider(store, factory, extras)\n\n    @JvmField\n    public actual val VIEW_MODEL_KEY: Key<String> = ViewModelProviders.ViewModelKey\n}\n<\/code><\/pre>\n
          ViewModelProvider.create()<\/code>\u65b9\u6cd5\uff0c\u5185\u90e8\u8c03\u7528\u4e0a\u9762\u76843\u53c2\u7684\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n
          \u5c0f\u7ed3<\/h3>\n
          \n  \u8bf4\u660e\uff1a<\/p>\n
            \n
          1. ViewModelProvider<\/code>\uff1aViewModel<\/code>\u63d0\u4f9b\u8005\uff0c\u7528\u4e8e\u83b7\u53d6ViewModel<\/code>\uff08\u5185\u90e8\u5982\u679c\u6ca1\u6709\uff0c\u5219\u4f1a\u521b\u5efaViewModel<\/code>\u5e76\u4fdd\u5b58\uff0c\u8be6\u7ec6\u770b\u540e\u9762\uff1a\u83b7\u53d6ViewModel<\/strong>\uff09\u3002<\/li>\n
          2. ViewModelProvider<\/code>\u7684\u521b\u5efa\uff0c\u5206\u4e3a2\u79cd\uff0cnew\u521b\u5efa<\/strong>\u3001create\u521b\u5efa<\/strong>\uff08viewModels()<\/code>\u6269\u5c55\u65b9\u6cd5\u7528\u7684\u662f\u6b64\uff0c\u8be6\u7ec6\u770b\u540e\u9762\uff1aviewModels()\u6269\u5c55\u65b9\u6cd5<\/strong>\uff09\u3002<\/li>\n
          3. ViewModelProvider<\/code>\u7c7b\u7684\u521b\u5efa<\/strong>\uff0c\u5176\u5185\u90e8\u6838\u5fc3\u7c7b<\/strong>\uff1a\n
              \n
            1. ViewModelStore<\/code>\uff1aViewModel<\/code>\u5546\u5e97\uff0c\u7528\u6765\u5b58\u50a8<\/strong>\u6216\u83b7\u53d6<\/strong>ViewModel<\/code>\uff0c\u8be6\u7ec6\u770b\u540e\u9762\uff1a\u83b7\u53d6ViewModelStore<\/strong>\u3002<\/li>\n
            2. Factory<\/code>\uff1aViewModel<\/code>\u7684\u521b\u5efa\u5de5\u5382\uff0c\u7528\u6765\u521b\u5efaViewModel<\/code>\u5b9e\u4f8b\uff0c\u8be6\u7ec6\u770b\u540e\u9762\uff1a\u83b7\u53d6Factory<\/strong>\u3002<\/li>\n
            3. CreationExtras<\/code>\uff1a\u4e3aFactory<\/code>\u521b\u5efa<\/strong>ViewModel<\/code>\u63d0\u4f9b\u989d\u5916<\/strong>\u4fe1\u606f\uff0c\u8be6\u7ec6\u770b\u540e\u9762\uff1a\u83b7\u53d6CreationExtras<\/strong>\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/blockquote>\n
              \u6211\u4eec\u4f9d\u6b21\u770b\u4e00\u4e0b\u521b\u5efa<\/strong>ViewModelProvider<\/code>\u9700\u8981\u7684\u6838\u5fc3\u7c7b<\/strong>\uff08ViewModelStore<\/code>\u3001ViewModelProvider.Factory<\/code>\u3001CreationExtras<\/code>\uff09\u4ed6\u4eec\u662f\u5982\u679c\u83b7\u53d6<\/strong>\u7684\uff0c\u6700\u540e\u518d\u6765\u770b\u4e00\u4e0bViewModelProvider<\/code>\u7684get()<\/code>\u65b9\u6cd5\u3002<\/p>\n
              \u83b7\u53d6ViewModelStore<\/h2>\n
              ViewModelStore<\/h3>\n
              ViewModelStore\u7c7b<\/strong><\/p>\n
              public open class ViewModelStore {\n\n    \/\/ ViewModel\u96c6\u5408\n    private val map = mutableMapOf<String, ViewModel>()\n\n    \/\/ \u4fdd\u5b58ViewModel\uff0c\u5982\u679ckey\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u503c\u8fdb\u884c\u8986\u76d6\uff0c\u4e4b\u524d\u7684ViewModel\u5219\u8c03\u7528clear()\u6e05\u7a7a\u903b\u8f91\u3002\n    @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n    public fun put(key: String, viewModel: ViewModel) {\n        val oldViewModel = map.put(key, viewModel)\n        oldViewModel?.clear()\n    }\n\n    \/\/ \u83b7\u53d6ViewModel\uff0c\u5982\u679c\u6ca1\u6709\u5219\u4e3anull\u3002\n    @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n    public operator fun get(key: String): ViewModel? {\n        return map[key]\n    }\n\n    \/\/ \u83b7\u53d6\u6240\u6709\u7684key\n    @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n    public fun keys(): Set<String> {\n        return HashSet(map.keys)\n    }\n\n    \/\/ \u901a\u77e5\u6240\u6709ViewModel\u7684clear()\uff08\u6e05\u7a7a\uff09\uff0c\u5e76\u6e05\u9664\u5176\u5185\u90e8ViewModel\u96c6\u5408\u3002\n    public fun clear() {\n        for (vm in map.values) {\n            vm.clear()\n        }\n        map.clear()\n    }\n}\n<\/code><\/pre>\n
              ViewModelStore<\/code>\u4e3aViewModel<\/code>\u5546\u5e97\uff0c\u5b83\u662f\u7528\u6765\u5b58\u50a8<\/strong>\u6216\u83b7\u53d6<\/strong>ViewModel<\/code>\u7684\uff0c\u662f\u4f7f\u7528LinkedHashMap<\/code>\u6765\u5b9e\u73b0\u7684\u3002\u5176clear()<\/code>\u65b9\u6cd5\u4f1a\u901a\u77e5\u6240\u6709ViewModel<\/code>\u7684clear()<\/code>\uff08\u6e05\u7a7a\uff09\uff0c\u5e76\u6e05\u9664<\/strong>\u5176\u5185\u90e8ViewModel<\/code>\u96c6\u5408<\/strong>\u3002<\/p>\n
              \u9ed8\u8ba4ViewModelStore<\/h3>\n
              \u5728\u521b\u5efaViewModelProvider<\/code>\u7c7b\u65f6\uff0cViewModelStore<\/code>\u662f\u53ef\u4ee5\u4eceViewModelStoreOwner<\/code>\u4e2d\u83b7\u53d6\u7684\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e00\u4e0b\u4ed6\u7684\u5b9e\u73b0\u3002<\/p>\n
              ViewModelStoreOwner\u7c7b<\/strong><\/p>\n
              public interface ViewModelStoreOwner {\n\n    public val viewModelStore: ViewModelStore\n}\n<\/code><\/pre>\n
              ViewModelStoreOwner<\/code>\u4e3aViewModelStore<\/code>\u7684\u6301\u6709\u8005\uff0c\u901a\u8fc7\u5b83\u7684\u5b50\u7c7b\u53ef\u4ee5\u83b7\u53d6\u5230ViewModelStore<\/code>\u3002<\/p>\n
              androidx<\/code>\u7684Activity<\/code>\u548cFragment<\/code>\u90fd\u5df2\u7ecf\u5b9e\u73b0\u4e86ViewModelStoreOwner<\/code>\uff0c\u6211\u4eec\u5206\u522b\u770b\u4e00\u4e0b\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n
              Activity<\/h4>\n
              androidx.activity.ComponentActivity\u7c7b<\/strong><\/p>\n
              open class ComponentActivity() :\n    androidx.core.app.ComponentActivity(),\n    ContextAware,\n    LifecycleOwner,\n    ViewModelStoreOwner,\n    HasDefaultViewModelProviderFactory,\n    SavedStateRegistryOwner,\n    OnBackPressedDispatcherOwner,\n    ActivityResultRegistryOwner,\n    ActivityResultCaller,\n    OnConfigurationChangedProvider,\n    OnTrimMemoryProvider,\n    OnNewIntentProvider,\n    OnMultiWindowModeChangedProvider,\n    OnPictureInPictureModeChangedProvider,\n    OnUserLeaveHintProvider,\n    MenuHost,\n    FullyDrawnReporterOwner {\n\n    private var _viewModelStore: ViewModelStore? = null\n\n    override val viewModelStore: ViewModelStore\n\n        get() {\n            \/\/ \u4e0d\u80fd\u5728onCreate\u8c03\u7528\u4e4b\u524d\u83b7\u53d6ViewModel\n            checkNotNull(application) {\n                (\"Your activity is not yet attached to the \" +\n                    \"Application instance. You can't request ViewModel before onCreate call.\")\n            }\n            \/\/ \u786e\u4fddViewModelStore\n            ensureViewModelStore()\n            \/\/ \u8fd4\u56deViewModelStore\n            return _viewModelStore!!\n        }\n\n    private fun ensureViewModelStore() {\n        if (_viewModelStore == null) {\n            val nc = lastNonConfigurationInstance as NonConfigurationInstances?\n            if (nc != null) {\n                \/\/ \u4ece NonConfigurationInstances \u4e2d\u6062\u590dViewModelStore\n                _viewModelStore = nc.viewModelStore\n            }\n            if (_viewModelStore == null) {\n                \/\/ _viewModelStore\u4e3a\u7a7a\uff0c\u5219\u521b\u5efa\u3002\n                _viewModelStore = ViewModelStore()\n            }\n        }\n    }\n<\/code><\/pre>\n
              androidx<\/code> Activity<\/code>\u5b9e\u73b0\u4e86ViewModelStoreOwner<\/code>\uff0c\u83b7\u53d6ViewModelStore<\/code>\uff0c\u5148\u4ece NonConfigurationInstances<\/code> \u4e2d\u6062\u590dViewModelStore<\/code>\uff08\u786e\u4fddActivity<\/code>\u91cd\u5efa<\/strong>\u540e\u8fd8\u80fd\u83b7\u53d6\u5230\u4e4b\u524d\u7684ViewModelStore<\/code>\uff0c\u5177\u4f53\u5206\u6790\u770b\u4e0b\u9762-ViewModel\u662f\u5982\u4f55\u4fdd\u6301\u4e0d\u53d8\u7684\uff1f<\/strong>\uff09\uff0c\u5982\u679c\u8fd8\u662f\u6ca1\u6709\uff0c\u5219\u8fdb\u884c\u521b\u5efa\u3002<\/p>\n
              \n  \u8bf4\u660e\uff1a<\/p>\n
                \n
              1. \u4e00\u4e2aandroidx<\/code> Activity<\/code>\uff0c\u5bf9\u5e94\u4e00\u4e2aViewModelStore<\/code>\u3002<\/li>\n
              2. androidx<\/code> Activity<\/code>\u4e0d\u80fd\u5728onCreate<\/code>\u8c03\u7528\u4e4b\u524d<\/strong>\u83b7\u53d6ViewModel<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                Fragment<\/h4>\n
                androidx.fragment.app.Fragment\u7c7b<\/strong><\/p>\n
                public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener, LifecycleOwner,\n        ViewModelStoreOwner, HasDefaultViewModelProviderFactory, SavedStateRegistryOwner,\n        ActivityResultCaller {\n\n    @NonNull\n    @Override\n    public ViewModelStore getViewModelStore() {\n        if (mFragmentManager == null) {\n            \/\/ \u4e0d\u80fd\u4ecedetached\u7684Fragment\u8bbf\u95eeViewModels\n            throw new IllegalStateException(\"Can't access ViewModels from detached fragment\");\n        }\n        if (getMinimumMaxLifecycleState() == Lifecycle.State.INITIALIZED.ordinal()) {\n            \/\/ \u5f53\u4f7f\u7528setMaxLifecycle(INITIALIZED)\u65f6\uff0c\u4e0d\u652f\u6301\u5728Fragment\u5230\u8fbeonCreate()\u4e4b\u524d\u8c03\u7528getViewModelStore()\n            throw new IllegalStateException(\"Calling getViewModelStore() before a Fragment \"\n                    + \"reaches onCreate() when using setMaxLifecycle(INITIALIZED) is not \"\n                    + \"supported\");\n        }\n        return mFragmentManager.getViewModelStore(this);\n    }\n}\n<\/code><\/pre>\n
                FragmentManager –> getViewModelStore\u65b9\u6cd5<\/strong><\/p>\n
                @NonNull\nViewModelStore getViewModelStore(@NonNull Fragment f) {\n    \/\/ mNonConfig\u4e3aFragmentManagerViewModel\n    return mNonConfig.getViewModelStore(f);\n}\n<\/code><\/pre>\n
                FragmentManagerViewModel –> getViewModelStore\u65b9\u6cd5<\/strong><\/p>\n
                @NonNull\nViewModelStore getViewModelStore(@NonNull Fragment f) {\n    ViewModelStore viewModelStore = mViewModelStores.get(f.mWho);\n    if (viewModelStore == null) {\n        viewModelStore = new ViewModelStore();\n        mViewModelStores.put(f.mWho, viewModelStore);\n    }\n    return viewModelStore;\n}\n<\/code><\/pre>\n
                androidx<\/code> Fragment<\/code>\u5b9e\u73b0\u4e86ViewModelStoreOwner<\/code>\uff0c\u83b7\u53d6ViewModelStore<\/code>\uff0c\u5148\u4ece FragmentManagerViewModel<\/code> \u4e2d\u6062\u590dViewModelStore<\/code>\uff08\u786e\u4fddFragment<\/code>\u91cd\u5efa<\/strong>\u540e\u8fd8\u80fd\u83b7\u53d6\u5230\u4e4b\u524d\u7684ViewModelStore<\/code>\uff0c\u5177\u4f53\u5206\u6790\u770b\u4e0b\u9762-ViewModel\u662f\u5982\u4f55\u4fdd\u6301\u4e0d\u53d8\u7684\uff1f<\/strong>\uff09\uff0c\u5982\u679c\u8fd8\u662f\u6ca1\u6709\uff0c\u5219\u8fdb\u884c\u521b\u5efa\u3002<\/p>\n
                \n  \u8bf4\u660e\uff1a<\/p>\n
                  \n
                1. \u4e00\u4e2aandroidx<\/code> Fragment<\/code>\uff0c\u5bf9\u5e94\u4e00\u4e2aViewModelStore<\/code>\u3002<\/li>\n
                2. androidx<\/code> Fragment<\/code>\u4e0d\u80fd\u5728onDetach<\/code>\u8c03\u7528\u4e4b\u540e<\/strong>\u83b7\u53d6ViewModel<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                  \u5c0f\u7ed3<\/h3>\n
                  \n  \u8bf4\u660e\uff1a<\/p>\n
                    \n
                  1. ViewModelStore<\/code>\uff1aViewModel<\/code>\u7684\u5546\u5e97<\/strong>\uff0c\u5b83\u662f\u7528\u6765\u5b58\u50a8<\/strong>\u6216\u83b7\u53d6<\/strong>ViewModel<\/code>\u7684\uff0c\u662f\u4f7f\u7528LinkedHashMap<\/code>\u6765\u5b9e\u73b0\u7684\u3002\u5176clear()<\/code>\u65b9\u6cd5\u4f1a\u5148\u901a<\/strong>\u77e5\u6240\u6709ViewModel<\/code>\u7684clear()<\/code>\uff08ViewModel<\/code>\u7684clear()<\/code>\uff1a\u5148\u6e05\u7a7a<\/strong>\u6240\u6709AutoCloseable<\/code>\uff0c\u540e\u901a\u77e5<\/strong>\u6b64ViewModel<\/code>\u7684onCleared()<\/code>\u56de\u8c03\uff09\uff0c\u540e\u6e05\u7a7a<\/strong>\u5176\u5185\u90e8ViewModel<\/code>\u96c6\u5408<\/strong>\u3002<\/li>\n
                  2. ViewModelStoreOwner<\/code>\uff1aViewModelStore<\/code>\u7684\u6301\u6709\u8005<\/strong>\uff0c\u901a\u8fc7\u5b83\u7684\u5b50\u7c7b<\/strong>\u53ef\u4ee5\u83b7\u53d6\u5230ViewModelStore<\/code>\uff0candroidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u90fd\u5df2\u7ecf\u5b9e\u73b0\u4e86ViewModelStoreOwner<\/code>\u3002<\/li>\n
                  3. \u5173\u7cfb<\/strong>\uff1a\n
                      \n
                    1. \u4eceandroidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u6e90\u7801\u5f97\u77e5\uff1a\u4e00\u4e2a<\/strong>androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u5bf9\u5e94\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\u3002<\/li>\n
                    2. \u4eceViewModelStore<\/code>\u6e90\u7801\u5f97\u77e5\uff1a\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>ViewModel<\/code>\u3002<\/li>\n
                    3. \u4eceViewModel<\/code>\u6e90\u7801\u5f97\u77e5\uff1a\u4e00\u4e2a<\/strong>ViewModel<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>AutoCloseable<\/code>\u3002<\/li>\n
                    4. \u603b\u7ed3<\/strong>\uff1a\u4e00\u4e2a<\/strong>androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u5bf9\u5e94\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\uff0c\u4e00\u4e2a<\/strong>ViewModelStore<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>ViewModel<\/code>\uff0c\u4e00\u4e2a<\/strong>ViewModel<\/code>\u5bf9\u5e94\u591a\u4e2a<\/strong>AutoCloseable<\/code>\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/blockquote>\n
                      \u83b7\u53d6Factory<\/h2>\n
                      Factory<\/h3>\n
                      ViewModelProvider.Factory\u7c7b<\/strong><\/p>\n
                      public actual interface Factory {\n\n    \/\/ \u521b\u5efa\u7ed9\u5b9aViewModel Class\u7684\u65b0\u5b9e\u4f8b\uff0c\u9ed8\u8ba4\u5b9e\u73b0\u629b\u51faUnsupportedOperationException\u5f02\u5e38\u3002\n    public fun <T : ViewModel> create(modelClass: Class<T>): T =\n        ViewModelProviders.unsupportedCreateViewModel()\n\n    \/\/ \u521b\u5efa\u7ed9\u5b9aViewModel Class\u7684\u65b0\u5b9e\u4f8b\u3002\n    public fun <T : ViewModel> create(modelClass: Class<T>, extras: CreationExtras): T =\n        create(modelClass)\n\n    \/\/ \u8c03\u7528\u7684\u4e0a\u9762\u7684\n    public actual fun <T : ViewModel> create(\n        modelClass: KClass<T>,\n        extras: CreationExtras,\n    ): T = create(modelClass.java, extras)\n\n    public companion object {\n\n        @JvmStatic\n        public fun from(vararg initializers: ViewModelInitializer<*>): Factory =\n            ViewModelProviders.createInitializerFactory(*initializers)\n    }\n}\n<\/code><\/pre>\n
                      ViewModelProvider.Factory<\/code>\u4e3aViewModel<\/code>\u7684\u521b\u5efa\u5de5\u5382\uff0c\u6b64Factory<\/code>\u901a\u8fc7ViewModel<\/code>\u7c7b\u7684class<\/code>\uff0c\u521b\u5efaViewModel<\/code>\u5b9e\u4f8b\u3002\u6211\u4eec\u5206\u522b\u6765\u770b\u4e00\u4e0b\u5b83\u7684\u5b50\u7c7bNewInstanceFactory<\/code>\u3001AndroidViewModelFactory<\/code>\u3002<\/p>\n
                      NewInstanceFactory<\/h4>\n
                      ViewModelProvider.NewInstanceFactory\u7c7b<\/strong><\/p>\n
                      public open class NewInstanceFactory\n@Suppress(\"SingletonConstructor\")\nconstructor() : Factory {\n\n    \/\/ \u4ee5\u4e0b2\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u5168\u90e8\u90fd\u662f\u8c03\u7528\u7684\u6b64\uff0c\u6b64JvmViewModelProviders\u7528\u7684\u53cd\u5c04\u521b\u5efa\u3002\n    public override fun <T : ViewModel> create(modelClass: Class<T>): T =\n        JvmViewModelProviders.createViewModel(modelClass)\n\n    public override fun <T : ViewModel> create(\n        modelClass: Class<T>,\n        extras: CreationExtras,\n    ): T = create(modelClass)\n\n    public override fun <T : ViewModel> create(\n        modelClass: KClass<T>,\n        extras: CreationExtras,\n    ): T = create(modelClass.java, extras)\n\n    public companion object {\n        private var _instance: NewInstanceFactory? = null\n\n        \/\/ \u5355\u4f8b NewInstanceFactory\n        @JvmStatic\n        public val instance: NewInstanceFactory\n            @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n            get() {\n                if (_instance == null) {\n                    _instance = NewInstanceFactory()\n                }\n                return _instance!!\n            }\n\n        @JvmField\n        public val VIEW_MODEL_KEY: Key<String> = ViewModelProviders.ViewModelKey\n    }\n}\n<\/code><\/pre>\n
                      internal object JvmViewModelProviders {\n\n    @Suppress(\"DocumentExceptions\")\n    fun <T : ViewModel> createViewModel(modelClass: Class<T>): T =\n        try {\n            \/\/ \u53cd\u5c04\u521b\u5efa\n            modelClass.getDeclaredConstructor().newInstance()\n        } catch (e: NoSuchMethodException) {\n            throw RuntimeException(\"Cannot create an instance of $modelClass\", e)\n        } catch (e: InstantiationException) {\n            throw RuntimeException(\"Cannot create an instance of $modelClass\", e)\n        } catch (e: IllegalAccessException) {\n            throw RuntimeException(\"Cannot create an instance of $modelClass\", e)\n        }\n}\n<\/code><\/pre>\n
                      NewInstanceFactory<\/code>\u7c7b\uff0c\u7ee7\u627fFactory<\/code>\uff0c\u5b9e\u73b0\u4e86create()<\/code>\u65b9\u6cd5\uff0c\u901a\u8fc7ViewModel<\/code>\u7c7b\u7684class<\/code>\uff0c\u53cd\u5c04<\/strong>\u521b\u5efa\u65e0\u53c2<\/strong>ViewModel<\/code>\u5b9e\u4f8b\u3002<\/p>\n
                      \n  \u8bf4\u660e\uff1a<\/p>\n
                        \n
                      1. \u4f7f\u7528NewInstanceFactory<\/code>\u521b\u5efa\uff0c\u6b64ViewModel<\/code>\u5fc5\u987b\u6709\uff0c\u65e0\u53c2<\/strong>\u7684\u4e14\u4e0d\u662f\u79c1\u6709<\/strong>\u7684\u6784\u9020\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n
                          \n
                        • \u53ef\u4ee5\u5904\u7406\u5982\u4e0bViewModel<\/code>\uff1a<\/li>\n
                        • \n
                            \n
                          • class MyViewModel : ViewModel()<\/code>\uff0c\u7531NewInstanceFactory<\/code>\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                              \n
                            1. NewInstanceFactory.instance<\/code>\u4e3a\u5168\u5c40\u5355\u4f8b<\/strong>NewInstanceFactory<\/code>\uff0c\u9632\u6b62\u4e86\u6bcf\u6b21\u521b\u5efa\u5de5\u5382\uff0c\u4f18\u5316\u4e86\u6027\u80fd\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                              AndroidViewModelFactory<\/h4>\n
                              ViewModelProvider.AndroidViewModelFactory\u7c7b<\/strong><\/p>\n
                              public open class AndroidViewModelFactory\nprivate constructor(\n    private val application: Application?,\n    \/\/ \u65e0\u7528\u53c2\u6570\n    @Suppress(\"UNUSED_PARAMETER\") unused: Int,\n) : NewInstanceFactory() {\n\n    @Suppress(\"SingletonConstructor\")\n    public constructor() : this(application = null, unused = 0)\n\n    \/\/ \u4e00\u822c\u90fd\u662f\u901a\u8fc7\u6b64\u521b\u5efa\n    @Suppress(\"SingletonConstructor\")\n    public constructor(application: Application) : this(application, unused = 0)\n\n    @Suppress(\"DocumentExceptions\")\n    override fun <T : ViewModel> create(modelClass: Class<T>, extras: CreationExtras): T {\n        return if (application != null) {\n            \/\/ application\u4e0d\u4e3a\u7a7a\uff0c\u8c03\u7528\u4e0b\u9762\u7684create(modelClass)\u65b9\u6cd5\u521b\u5efa\u3002\n            create(modelClass)\n        } else {\n            \/\/ application\u4e3a\u7a7a\uff0c\u4ece\u6269\u5c55\u4e2d\u7ee7\u7eed\u83b7\u53d6\u3002\n            val application = extras[APPLICATION_KEY]\n            if (application != null) {\n                \/\/ application\u4e0d\u4e3a\u7a7a\uff0c\u76f4\u63a5\u8c03\u7528\u4e0b\u9762\u7684create(modelClass, application)\u65b9\u6cd5\u521b\u5efa\u3002\n                create(modelClass, application)\n            } else {\n                \/\/ application\u4e3a\u7a7a\n                if (AndroidViewModel::class.java.isAssignableFrom(modelClass)) {\n                    \/\/ \u662fAndroidViewModel\u5b50\u7c7b\uff0c\u5fc5\u987b\u6709application\uff0c\u629b\u51fa\u5f02\u5e38\u3002\n                    throw IllegalArgumentException(\n                        \"CreationExtras must have an application by `APPLICATION_KEY`\"\n                    )\n                }\n                \/\/ application\u4e3a\u7a7a\uff0c\u5e76\u4e14\u4e0d\u662fAndroidViewModel\u5b50\u7c7b\uff0c\u8c03\u7528\u7236\u7c7b\u7684create()\uff08\u53cd\u5c04\u521b\u5efa\u65e0\u53c2ViewModel\uff09\u3002\n                super.create(modelClass)\n            }\n        }\n    }\n\n    @Suppress(\"DocumentExceptions\")\n    override fun <T : ViewModel> create(modelClass: Class<T>): T {\n        return if (application == null) {\n            \/\/ application\u4e3a\u7a7a\uff0c\u629b\u51fa\u5f02\u5e38AndroidViewModelFactory\u7a7a\u6784\u9020\u51fd\u6570\uff0c\u5fc5\u987b\u7528\u4e0a\u9762\u7684create(modelClass,extras)\u65b9\u6cd5\u521b\u5efa\u3002\n            throw UnsupportedOperationException(\n                \"AndroidViewModelFactory constructed \" +\n                    \"with empty constructor works only with \" +\n                    \"create(modelClass: Class<T>, extras: CreationExtras).\"\n            )\n        } else {\n            \/\/ application\u4e0d\u4e3a\u7a7a\uff0c\u8c03\u7528\u4e0b\u9762\u7684create(modelClass, application)\u65b9\u6cd5\u521b\u5efa\u3002\n            create(modelClass, application)\n        }\n    }\n\n    @Suppress(\"DocumentExceptions\")\n    private fun <T : ViewModel> create(modelClass: Class<T>, app: Application): T {\n        return if (AndroidViewModel::class.java.isAssignableFrom(modelClass)) {\n            try {\n                \/\/ \u6b64ViewModel\u4e3aAndroidViewModel\u7684\u5b50\u7c7b\uff0c\u5219\u4f20\u5165Application\u5e76\u521b\u5efa\u3002\n                modelClass.getConstructor(Application::class.java).newInstance(app)\n            } catch (e: NoSuchMethodException) {\n                throw RuntimeException(\"Cannot create an instance of $modelClass\", e)\n            } catch (e: IllegalAccessException) {\n                throw RuntimeException(\"Cannot create an instance of $modelClass\", e)\n            } catch (e: InstantiationException) {\n                throw RuntimeException(\"Cannot create an instance of $modelClass\", e)\n            } catch (e: InvocationTargetException) {\n                throw RuntimeException(\"Cannot create an instance of $modelClass\", e)\n            }\n        } else super.create(modelClass)\n    }\n\n    public companion object {\n        private var _instance: AndroidViewModelFactory? = null\n\n        \/\/ \u5355\u4f8b AndroidViewModelFactory\n        @JvmStatic\n        public fun getInstance(application: Application): AndroidViewModelFactory {\n            if (_instance == null) {\n                _instance = AndroidViewModelFactory(application)\n            }\n            return _instance!!\n        }\n\n        @JvmField\n        public val APPLICATION_KEY: Key<Application> = object : Key<Application> {}\n    }\n}\n<\/code><\/pre>\n
                              AndroidViewModelFactory<\/code>\u7c7b\uff0c\u7ee7\u627fNewInstanceFactory<\/code> \uff0c\u91cd\u5199\u4e86create()<\/code>\u65b9\u6cd5\uff0c\u901a\u8fc7ViewModel<\/code>\u7c7b\u7684class<\/code>\u5224\u65ad\uff0c\u5982\u679c\u6b64ViewModel<\/code>\u4e3aAndroidViewModel<\/code>\u7684\u5b50\u7c7b\uff0c\u5219\u4f20\u5165Application<\/code>\u5e76\u53cd\u5c04<\/strong>\u521b\u5efa\uff1b\u5426\u5219\u4e3a\u666e\u901aViewModel<\/code>\u8d70\u7236\u7c7b<\/strong>NewInstanceFactory<\/code>\u7684\u521b\u5efa\uff08\u53cd\u5c04<\/strong>\u521b\u5efa\u65e0\u53c2<\/strong>ViewModel<\/code>\u5b9e\u4f8b\uff09\u3002<\/p>\n
                              \n  \u8bf4\u660e\uff1a<\/p>\n
                                \n
                              1. \u4f7f\u7528AndroidViewModelFactory<\/code>\u521b\u5efa\uff0c\u5982\u679c\u6b64ViewModel<\/code>\u662fAndroidViewModel<\/code>\u5b50\u7c7b\uff0c\u5fc5\u987b\u6709\u4e00\u53c2<\/strong>\u7684\u4e14\u662fApplication<\/code>\u4e14\u4e0d\u662f\u79c1\u6709<\/strong>\u7684\u6784\u9020\u65b9\u6cd5\uff08\u4e0d\u80fd\u65e0\u53c2\uff09\uff1b\u5426\u5219\u4e3a\u666e\u901aViewModel<\/code>\uff0c\u5fc5\u987b\u6709\u65e0\u53c2<\/strong>\u7684\u4e14\u4e0d\u662f\u79c1\u6709<\/strong>\u7684\u6784\u9020\u65b9\u6cd5\uff08\u4e0d\u80fd\u6709\u53c2\uff09\u3002<\/li>\n<\/ol>\n
                                  \n
                                • \u53ef\u4ee5\u5904\u7406\u5982\u4e0bViewModel<\/code>\uff1a<\/li>\n
                                • \n
                                    \n
                                  • class MyViewModel : ViewModel()<\/code>\uff0c\u7531NewInstanceFactory<\/code>\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n
                                  • \n
                                      \n
                                    • class MyViewModel(application: Application) : AndroidViewModel(application)<\/code>\uff0c\u7531AndroidViewModelFactory<\/code>\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                        \n
                                      1. AndroidViewModelFactory.getInstance(application)<\/code>\u4e3a\u5168\u5c40\u5355\u4f8b<\/strong>AndroidViewModelFactory<\/code>\uff0c\u9632\u6b62\u4e86\u6bcf\u6b21\u521b\u5efa\u5de5\u5382\uff0c\u4f18\u5316\u4e86\u6027\u80fd\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                        \u9ed8\u8ba4Factory<\/h3>\n
                                        \u5728\u521b\u5efaViewModelProvider<\/code>\u7c7b\u65f6\uff0c\u5982\u679cViewModelProvider.Factory<\/code>\u672a\u6307\u5b9a\uff0c\u5219\u9ed8\u8ba4<\/strong>\u4e3aViewModelProviders.getDefaultFactory(owner)<\/code>\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e00\u4e0b\u4ed6\u7684\u5b9e\u73b0\u3002<\/p>\n
                                        internal fun getDefaultFactory(owner: ViewModelStoreOwner): ViewModelProvider.Factory =\n    if (owner is HasDefaultViewModelProviderFactory) {\n        owner.defaultViewModelProviderFactory\n    } else {\n        DefaultViewModelProviderFactory\n    }\n<\/code><\/pre>\n
                                        ViewModelProviders.getDefaultFactory(owner)<\/code>\u65b9\u6cd5\uff0c\u5982\u679cowner<\/code>\u5b9e\u73b0HasDefaultViewModelProviderFactory<\/code>\u63a5\u53e3\uff0c\u5219\u83b7\u53d6\u5176\u63d0\u4f9b\u7684Factory<\/code>\uff0c\u5426\u5219\u4f7f\u7528DefaultViewModelProviderFactory<\/code>\u3002<\/p>\n
                                        \u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0bDefaultViewModelProviderFactory<\/code>\u7c7b\uff0c\u7136\u540e\u518d\u6765\u770b\u4e00\u4e0bHasDefaultViewModelProviderFactory<\/code>\u63a5\u53e3\u3002<\/p>\n
                                        internal actual object DefaultViewModelProviderFactory : ViewModelProvider.Factory {\n    override fun <T : ViewModel> create(modelClass: KClass<T>, extras: CreationExtras): T =\n        \/\/ \u53cd\u5c04\u521b\u5efa\u65e0\u53c2ViewModel\n        JvmViewModelProviders.createViewModel(modelClass.java)\n}\n<\/code><\/pre>\n
                                        DefaultViewModelProviderFactory<\/code>\uff0c\u5185\u90e8\u662f\u4f7f\u7528\u53cd\u5c04<\/strong>\u521b\u5efa\u65e0\u53c2<\/strong>ViewModel<\/code>\uff0c\u8be6\u7ec6\u770b\u4e0a\u9762-JvmViewModelProviders\u7c7b\u6e90\u7801<\/strong>\u3002<\/p>\n
                                        HasDefaultViewModelProviderFactory\u7c7b<\/strong><\/p>\n
                                        public interface HasDefaultViewModelProviderFactory {\n    \/\/ \u9ed8\u8ba4Factory\n    public val defaultViewModelProviderFactory: ViewModelProvider.Factory\n    \/\/ \u9ed8\u8ba4CreationExtras\n    public val defaultViewModelCreationExtras: CreationExtras\n        get() = CreationExtras.Empty\n}\n<\/code><\/pre>\n
                                        HasDefaultViewModelProviderFactory<\/code>\u63a5\u53e3\uff0c\u4e3a\u6807\u8bb0<\/strong>\u662f\u5426\u53ef\u4ee5\u83b7\u53d6\u5230\u9ed8\u8ba4<\/strong>Factory<\/code>\u3001\u9ed8\u8ba4<\/strong>CreationExtras<\/code>\uff08\u8be6\u7ec6\u89c1\u4e0b\u9762-\u83b7\u53d6CreationExtras<\/strong>\uff09\u3002<\/p>\n
                                        androidx<\/code>\u7684Activity<\/code>\u548cFragment<\/code>\u90fd\u5df2\u7ecf\u5b9e\u73b0\u4e86HasDefaultViewModelProviderFactory<\/code>\uff0c\u6211\u4eec\u6765\u5206\u522b\u770b\u4e00\u4e0b\u5b83\u4eec\u7684defaultViewModelProviderFactory<\/code>\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n
                                        Activity<\/h4>\n
                                        androidx.activity.ComponentActivity\u7c7b<\/strong><\/p>\n
                                        open class ComponentActivity() :\n    androidx.core.app.ComponentActivity(),\n    ContextAware,\n    LifecycleOwner,\n    ViewModelStoreOwner,\n    HasDefaultViewModelProviderFactory,\n    SavedStateRegistryOwner,\n    OnBackPressedDispatcherOwner,\n    ActivityResultRegistryOwner,\n    ActivityResultCaller,\n    OnConfigurationChangedProvider,\n    OnTrimMemoryProvider,\n    OnNewIntentProvider,\n    OnMultiWindowModeChangedProvider,\n    OnPictureInPictureModeChangedProvider,\n    OnUserLeaveHintProvider,\n    MenuHost,\n    FullyDrawnReporterOwner {\n\n    override val defaultViewModelProviderFactory: ViewModelProvider.Factory by lazy {\n        \/\/ \u521b\u5efaSavedStateViewModelFactory\uff0c\u4f1a\u628aApplication\u3001\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570\uff0c\u4f20\u5165\u5230\u6784\u9020\u65b9\u6cd5\u4e2d\u3002\n        SavedStateViewModelFactory(application, this, if (intent != null) intent.extras else null)\n    }\n}\n<\/code><\/pre>\n
                                        androidx<\/code>\u7684Activity<\/code>\uff0cgetDefaultViewModelProviderFactory()<\/code>\u662f\u4f7f\u7528lazy()<\/code>\u65b9\u6cd5\uff0c\u53ea\u8ba9\u5176\u521b\u5efa\u4e00\u6b21<\/strong>\u3002<\/p>\n
                                        Fragment<\/h4>\n
                                        androidx.fragment.app.Fragment\u7c7b<\/strong><\/p>\n
                                        public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener, LifecycleOwner,\n        ViewModelStoreOwner, HasDefaultViewModelProviderFactory, SavedStateRegistryOwner,\n        ActivityResultCaller {\n\n    ViewModelProvider.Factory mDefaultFactory;\n\n    @NonNull\n    @Override\n    public ViewModelProvider.Factory getDefaultViewModelProviderFactory() {\n        if (mFragmentManager == null) {\n            \/\/ \u4e0d\u80fd\u4ecedetached\u7684Fragment\u8bbf\u95eeViewModels\n            throw new IllegalStateException(\"Can't access ViewModels from detached fragment\");\n        }\n        if (mDefaultFactory == null) {\n            \/\/ \u9ed8\u8ba4\u5de5\u5382\u4e3a\u7a7a\uff0c\u5219\u8fdb\u884c\u521b\u5efaSavedStateViewModelFactory\u3002\n            Application application = null;\n            Context appContext = requireContext().getApplicationContext();\n            while (appContext instanceof ContextWrapper) {\n                if (appContext instanceof Application) {\n                    application = (Application) appContext;\n                    break;\n                }\n                appContext = ((ContextWrapper) appContext).getBaseContext();\n            }\n            if (application == null && FragmentManager.isLoggingEnabled(Log.DEBUG)) {\n                Log.d(FragmentManager.TAG, \"Could not find Application instance from \"\n                        + \"Context \" + requireContext().getApplicationContext() + \", you will \"\n                        + \"not be able to use AndroidViewModel with the default \"\n                        + \"ViewModelProvider.Factory\");\n            }\n            \/\/ \u521b\u5efaSavedStateViewModelFactory\uff0c\u4f1a\u628aApplication\u3001\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570\uff0c\u4f20\u5165\u5230\u6784\u9020\u65b9\u6cd5\u4e2d\u3002\n            mDefaultFactory = new SavedStateViewModelFactory(\n                    application,\n                    this,\n                    getArguments());\n        }\n        return mDefaultFactory;\n    }\n}\n<\/code><\/pre>\n
                                        androidx<\/code>\u7684Fragment<\/code>\uff0cgetDefaultViewModelProviderFactory()<\/code>\u65b9\u6cd5\uff0c\u4f1a\u5224\u65ad\u5982\u679c\u6ca1\u6709\u521b\u5efa\u4f1a\u76f4\u63a5\u521b\u5efa\uff0c\u5426\u5219\u76f4\u63a5\u8fd4\u56de\uff0c\u53ea\u8ba9\u5176\u521b\u5efa\u4e00\u6b21<\/strong>\u3002<\/p>\n
                                        androidx<\/code>\u7684Activity<\/code>\u548cFragment<\/code>\u7684getDefaultViewModelProviderFactory()<\/code>\u5b9e\u73b0\u76f8\u540c\uff0c\u90fd\u662f\u521b\u5efaSavedStateViewModelFactory<\/code>\u5e76\u4f1a\u628aApplication<\/code>\u3001\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570<\/strong>\uff0c\u4f20\u5165\u5230\u6784\u9020\u65b9\u6cd5\u4e2d\u3002<\/p>\n
                                        \u6211\u4eec\u63a5\u4e0b\u6765\uff0c\u770b\u4e00\u4e0bSavedStateViewModelFactory<\/code>\u7c7b\u3002<\/p>\n
                                        SavedStateViewModelFactory\u7c7b<\/strong><\/p>\n
                                        class SavedStateViewModelFactory : ViewModelProvider.OnRequeryFactory, ViewModelProvider.Factory {\n    private var application: Application? = null\n    private val factory: ViewModelProvider.Factory\n    private var defaultArgs: Bundle? = null\n    private var lifecycle: Lifecycle? = null\n    private var savedStateRegistry: SavedStateRegistry? = null\n\n    \/\/ \u6784\u9020\u65b9\u6cd5\uff0c\u65e0\u53c2\n    constructor() {\n        factory = ViewModelProvider.AndroidViewModelFactory()\n    }\n\n    \/\/ \u6784\u9020\u65b9\u6cd5\uff0c\u8c03\u7528\u7684\u4e0b\u9762\u7684\uff0c\u672a\u4f20\u9ed8\u8ba4\u53c2\u6570\u3002\n    constructor(\n        application: Application?,\n        owner: SavedStateRegistryOwner\n    ) : this(application, owner, null)\n\n    \/\/ \u6784\u9020\u65b9\u6cd5\uff0c\u6709\u4f20\u9ed8\u8ba4\u53c2\u6570\u3002Activity\u3001Fragment\u5185\u7684SavedStateViewModelFactory\u521b\u5efa\uff0c\u5c31\u662f\u8c03\u7528\u7684\u6b64\u3002\n    @SuppressLint(\"LambdaLast\")\n    constructor(application: Application?, owner: SavedStateRegistryOwner, defaultArgs: Bundle?) {\n        savedStateRegistry = owner.savedStateRegistry\n        lifecycle = owner.lifecycle\n        this.defaultArgs = defaultArgs\n        this.application = application\n        \/\/ \u5de5\u5382\uff0c\u5982\u679capplication\u4e3a\u7a7a\uff0c\u5219\u7528\u5168\u5c40\u7684\u5355\u4f8b\u7684AndroidViewModelFactory\uff08\u6709application\uff09\uff1b\n        \/\/ \u5426\u5219\u5c31\u65b0\u5efa\u4e00\u4e2aAndroidViewModelFactory\uff08\u65e0application\uff09\u3002\n        factory = if (application != null) getInstance(application)\n            else ViewModelProvider.AndroidViewModelFactory()\n    }\n\n    \/\/ \u901a\u8fc7ViewModelProvider(this).get()\u521b\u5efaViewModel\uff0c\u5c31\u662f\u8c03\u7528\u7684\u6b64\u65b9\u6cd5\uff0c\u8be6\u7ec6\u770b\u540e\u9762\uff1a\u83b7\u53d6ViewModel\u3002\n    override fun <T : ViewModel> create(modelClass: Class<T>, extras: CreationExtras): T {\n        \/\/ \u5f53\u524dViewModel\u7684key\n        val key = extras[ViewModelProvider.NewInstanceFactory.VIEW_MODEL_KEY]\n            ?: throw IllegalStateException(\n                \"VIEW_MODEL_KEY must always be provided by ViewModelProvider\"\n            )\n\n        return if (extras[SAVED_STATE_REGISTRY_OWNER_KEY] != null &&\n            extras[VIEW_MODEL_STORE_OWNER_KEY] != null) { \/\/ \u901a\u5e38\u4f1a\u8d70\u8fd9\u4e2a\u903b\u8f91\n            \/\/ \u6709SavedStateRegistryOwner\u3001ViewModelStateRegistryOwner\uff0c\u7528\u4e8eextras.createSavedStateHandle()\u521b\u5efaSavedStateHandle\u7528\u3002\n            \/\/ \u83b7\u53d6Application\n            val application = extras[ViewModelProvider.AndroidViewModelFactory.APPLICATION_KEY]\n            \/\/ \u662f\u5426\u662fAndroidViewModel\u5b50\u7c7b\n            val isAndroidViewModel = AndroidViewModel::class.java.isAssignableFrom(modelClass)\n            val constructor: Constructor<T>? = if (isAndroidViewModel && application != null) {\n                \/\/ \u662fAndroidViewModel\u5b50\u7c7b\uff0c\u5e76\u4e14application\u4e0d\u4e3a\u7a7a\uff0c\u83b7\u53d6(Application, SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\u3002\n                findMatchingConstructor(modelClass, ANDROID_VIEWMODEL_SIGNATURE)\n            } else {\n                \/\/ \u4e0d\u662fAndroidViewModel\u5b50\u7c7b\uff0c\u6216\u8005application\u4e3a\u7a7a\uff0c\u83b7\u53d6(SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\u3002\n                findMatchingConstructor(modelClass, VIEWMODEL_SIGNATURE)\n            }\n\n            if (constructor == null) {\n                \/\/ \u6ca1\u6709\u83b7\u53d6\u5230\uff0c\u5219\u8bf4\u660e\u662f\u6ca1\u7528SavedStateHandle\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5219\u76f4\u63a5\u7528factory\uff08AndroidViewModelFactory\uff09\u5904\u7406\u3002\n                return factory.create(modelClass, extras)\n            }\n            \/\/ \u4ee5\u4e0b\u4e3a\u9700\u8981SavedStateHandle\n            val viewModel = if (isAndroidViewModel && application != null) {\n                \/\/ \u53cd\u5c04\u521b\u5efa(Application, SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5e76\u4f20\u5165SavedStateHandle\u3002\n                newInstance(modelClass, constructor, application, extras.createSavedStateHandle())\n            } else {\n                \/\/ \u53cd\u5c04\u521b\u5efa(SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5e76\u4f20\u5165SavedStateHandle\u3002\n                newInstance(modelClass, constructor, extras.createSavedStateHandle())\n            }\n            \/\/ \u8fd4\u56deViewModel\n            viewModel\n        } else {\n            \/\/ \u6ca1\u6709SavedStateRegistryOwner\u3001ViewModelStateRegistryOwner\n            val viewModel = if (lifecycle != null) {\n                \/\/ lifecycle\u4e0d\u4e3a\u7a7a\uff0c\u76f4\u63a5\u8c03\u7528\u4e0b\u9762\u7684create(key, modelClass)\u65b9\u6cd5\u3002\n                create(key, modelClass)\n            } else {\n                \/\/ lifecycle\u4e3a\u7a7a\uff0c\u5fc5\u987b\u63d0\u4f9bsavedStateRegistryOwner\u3001viewModelStateRegistryOwner\u3002\n                throw IllegalStateException(\"SAVED_STATE_REGISTRY_OWNER_KEY and\" +\n                    \"VIEW_MODEL_STORE_OWNER_KEY must be provided in the creation extras to\" +\n                    \"successfully create a ViewModel.\")\n            }\n            \/\/ \u8fd4\u56deViewModel\n            viewModel\n        }\n    }\n\n    fun <T : ViewModel> create(key: String, modelClass: Class<T>): T {\n        \/\/ \u4f7f\u7528\u7a7a\u6784\u9020\u51fd\u6570\u6784\u9020\u7684SavedStateViewModelFactory\uff0c\u53ea\u652f\u6301\u8c03\u7528create(modelClass, extras)\u3002\n        val lifecycle = lifecycle\n            ?: throw UnsupportedOperationException(\n                \"SavedStateViewModelFactory constructed with empty constructor supports only \" +\n                    \"calls to create(modelClass: Class<T>, extras: CreationExtras).\"\n            )\n        \/\/ \u662f\u5426\u662fAndroidViewModel\u5b50\u7c7b\n        val isAndroidViewModel = AndroidViewModel::class.java.isAssignableFrom(modelClass)\n        val constructor: Constructor<T>? = if (isAndroidViewModel && application != null) {\n            \/\/ \u662fAndroidViewModel\u5b50\u7c7b\uff0c\u5e76\u4e14application\u4e0d\u4e3a\u7a7a\uff0c\u83b7\u53d6(Application, SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\u3002\n            findMatchingConstructor(modelClass, ANDROID_VIEWMODEL_SIGNATURE)\n        } else {\n            \/\/ \u4e0d\u662fAndroidViewModel\u5b50\u7c7b\uff0c\u6216\u8005application\u4e3a\u7a7a\uff0c\u83b7\u53d6(SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\u3002\n            findMatchingConstructor(modelClass, VIEWMODEL_SIGNATURE)\n        }\n        \/\/ \u6ca1\u6709\u83b7\u53d6\u5230\uff0c\u5219\u8bf4\u660e\u662f\u6ca1\u7528SavedStateHandle\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5219\u76f4\u63a5\u7528AndroidViewModelFactory\u6216NewInstanceFactory\u5904\u7406\uff0c\u5e76\u8fd4\u56de\u3002\n        constructor\n            ?:\n            return if (application != null) factory.create(modelClass)\n            else instance.create(modelClass)\n        \/\/ \u4ee5\u4e0b\u4e3a\u9700\u8981SavedStateHandle\n        \/\/ \u83b7\u53d6LegacySavedStateHandleController\u521b\u5efa\u7684\u63a7\u5236\u5668\n        val controller = LegacySavedStateHandleController.create(\n            savedStateRegistry!!, lifecycle, key, defaultArgs\n        )\n        val viewModel: T = if (isAndroidViewModel && application != null) {\n            \/\/ \u53cd\u5c04\u521b\u5efa(Application, SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5e76\u4f20\u5165SavedStateHandle\u3002\n            newInstance(modelClass, constructor, application!!, controller.handle)\n        } else {\n            \/\/ \u53cd\u5c04\u521b\u5efa(SavedStateHandle)\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5e76\u4f20\u5165SavedStateHandle\u3002\n            newInstance(modelClass, constructor, controller.handle)\n        }\n        \/\/ \u8ba9controller\u5728viewModel\u5173\u95ed\u65f6\uff0c\u5173\u95ed\u3002\n        viewModel.addCloseable(\n            LegacySavedStateHandleController.TAG_SAVED_STATE_HANDLE_CONTROLLER, controller\n        )\n        \/\/ \u8fd4\u56deViewModel\n        return viewModel\n    }\n\n    override fun <T : ViewModel> create(modelClass: Class<T>): T {\n        val canonicalName = modelClass.canonicalName\n            ?: throw IllegalArgumentException(\"Local and anonymous classes can not be ViewModels\")\n        \/\/ \u4f7f\u7528\u7c7b\u540d\u4f5c\u4e3akey\uff0c\u521b\u5efaViewModel\u3002\n        return create(canonicalName, modelClass)\n    }\n\n    @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n    override fun onRequery(viewModel: ViewModel) {\n        \/\/ needed only for legacy path\n        if (lifecycle != null) {\n            LegacySavedStateHandleController.attachHandleIfNeeded(\n                viewModel,\n                savedStateRegistry!!,\n                lifecycle!!\n            )\n        }\n    }\n}\n\ninternal fun <T : ViewModel?> newInstance(\n    modelClass: Class<T>,\n    constructor: Constructor<T>,\n    vararg params: Any\n): T {\n    return try {\n        \/\/ \u53cd\u5c04\u521b\u5efa\n        constructor.newInstance(*params)\n    } catch (e: IllegalAccessException) {\n        throw RuntimeException(\"Failed to access $modelClass\", e)\n    } catch (e: InstantiationException) {\n        throw RuntimeException(\"A $modelClass cannot be instantiated.\", e)\n    } catch (e: InvocationTargetException) {\n        throw RuntimeException(\n            \"An exception happened in constructor of $modelClass\", e.cause\n        )\n    }\n}\n\n\/\/ (Application, SavedStateHandle)\u7b7e\u540d\nprivate val ANDROID_VIEWMODEL_SIGNATURE = listOf<Class<*>>(\n    Application::class.java,\n    SavedStateHandle::class.java\n)\n\/\/ (SavedStateHandle)\u7b7e\u540d\nprivate val VIEWMODEL_SIGNATURE = listOf<Class<*>>(SavedStateHandle::class.java)\n\n\/\/ \u627e\u5230\u5bf9\u5e94\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\ninternal fun <T> findMatchingConstructor(\n    modelClass: Class<T>,\n    signature: List<Class<*>>\n): Constructor<T>? {\n    for (constructor in modelClass.constructors) {\n        val parameterTypes = constructor.parameterTypes.toList()\n        if (signature == parameterTypes) {\n            @Suppress(\"UNCHECKED_CAST\")\n            return constructor as Constructor<T>\n        }\n        if (signature.size == parameterTypes.size && parameterTypes.containsAll(signature)) {\n            throw UnsupportedOperationException(\n                \"Class ${modelClass.simpleName} must have parameters in the proper \" +\n                    \"order: $signature\"\n            )\n        }\n    }\n    return null\n}\n<\/code><\/pre>\n
                                        SavedStateViewModelFactory<\/code>\u7c7b\uff0c\u7ee7\u627fFactory<\/code> \uff0c\u91cd\u5199\u4e86create()<\/code>\u65b9\u6cd5\uff0c\u901a\u8fc7ViewModel<\/code>\u7c7b\u7684class<\/code>\u5224\u65ad\uff0c\u5982\u679c\u6b64ViewModel<\/code>\u6709\u4f7f\u7528SavedStateHandle<\/code>\uff0c\u5219\u4f20\u5165SavedStateHandle<\/code>\u5e76\u53cd\u5c04<\/strong>\u521b\u5efa\uff1b\u5426\u5219\u4e3a\u666e\u901aViewModel<\/code>\u3001AndroidViewModel<\/code>\u5b50\u7c7b\uff0c\u8d70factory<\/strong>AndroidViewModelFactory<\/code>\u7684\u521b\u5efa\uff08\u8be6\u7ec6\u89c1\u4e0a\u9762\uff09\u3002<\/p>\n
                                        \n  \u8bf4\u660e\uff1a<\/p>\n
                                          \n
                                        1. \u4f7f\u7528SavedStateViewModelFactory<\/code>\u521b\u5efa\uff0c\u5982\u679c\u6b64ViewModel<\/code>\u6784\u9020\u65b9\u6cd5<\/strong>\u91cc\u9762\u6ca1\u6709\u7528SavedStateHandle<\/code>\uff0c\u5219\u76f4\u63a5\u4f7f\u7528AndroidViewModelFactory<\/code>\u521b\u5efa\uff1b\u5426\u5219\uff0c\u5219\u53cd\u5c04\u521b\u5efa(Application, SavedStateHandle)<\/code>\u6216(SavedStateHandle)<\/code>\u7b7e\u540d\u7684\u6784\u9020\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n
                                            \n
                                          • \u53ef\u4ee5\u5904\u7406\u5982\u4e0bViewModel<\/code>\uff1a<\/li>\n
                                          • \n
                                              \n
                                            • class MyViewModel : ViewModel()<\/code>\uff0c\u7531NewInstanceFactory<\/code>\u521b\u5efa\u3002<\/li>\n
                                            • class MyViewModel(application: Application) : AndroidViewModel(application)<\/code>\uff0c\u7531AndroidViewModelFactory<\/code>\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n
                                            • \n
                                                \n
                                              • class MyViewModel(val handle: SavedStateHandle) : ViewModel()<\/code>\uff0c\u7531SavedStateViewModelFactory<\/code>\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n
                                              • \n
                                                  \n
                                                • class MyViewModel(application: Application, val handle: SavedStateHandle) : AndroidViewModel(application)<\/code>\uff0c\u7531SavedStateViewModelFactory<\/code>\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                                                    \n
                                                  1. \u7531\u4e8eandroidx<\/code>\u7684Activity<\/code>\u548cFragment<\/code>\uff0c\u90fd\u5b9e\u73b0\u4e86\u83b7\u53d6\u9ed8\u8ba4<\/strong>Factory<\/code>\uff0c\u90fd\u662f\u521b\u5efaSavedStateViewModelFactory<\/code>\uff08\u53ea\u8ba9\u5176\u521b\u5efa\u4e00\u6b21<\/strong>\uff09\u5e76\u4f1a\u628aApplication<\/code>\u3001\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570<\/strong>\uff0c\u4f20\u5165\u5230\u6784\u9020\u65b9\u6cd5\u4e2d\u3002<\/li>\n
                                                  2. \u7531\u4e8eSavedStateHandle<\/code>\u7684\u521b\u5efa\uff0c\u4f20\u5165\u4e86\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570<\/strong>\uff0c\u6240\u4ee5\u901a\u8fc7SavedStateHandle<\/code>\u4e5f\u80fd\u83b7\u53d6\u5230\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570<\/strong>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                    \u5c0f\u7ed3<\/h3>\n
                                                    \n  \u8bf4\u660e\uff1a<\/p>\n
                                                      \n
                                                    1. ViewModelProvider.Factory<\/code>\uff1aViewModel<\/code>\u7684\u521b\u5efa\u5de5\u5382\uff0c\u6b64Factory<\/code>\u901a\u8fc7ViewModel<\/code>\u7c7b\u7684class<\/code>\uff0c\u521b\u5efaViewModel<\/code>\u5b9e\u4f8b\u3002<\/li>\n
                                                    2. HasDefaultViewModelProviderFactory<\/code>\uff1a\u662f\u5426\u6709\u9ed8\u8ba4<\/strong>Factory<\/code>\uff0c\u901a\u8fc7\u5b83\u7684\u5b50\u7c7b<\/strong>\u53ef\u4ee5\u83b7\u53d6\u5230\u9ed8\u8ba4<\/strong>Factory<\/code>\u3001\u9ed8\u8ba4<\/strong>CreationExtras<\/code>\uff08\u8be6\u7ec6\u89c1\u4e0b\u9762-\u83b7\u53d6CreationExtras<\/strong>\uff09\uff0candroidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u90fd\u5df2\u7ecf\u5b9e\u73b0\u4e86HasDefaultViewModelProviderFactory<\/code>\u3002<\/li>\n
                                                    3. androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u5b9e\u73b0HasDefaultViewModelProviderFactory<\/code>\uff0c\u5176getDefaultViewModelProviderFactory()<\/code>\u65b9\u6cd5\u5206\u522b\u7ef4\u62a4\u4e86\u4e00\u4e2aSavedStateViewModelFactory<\/code>\uff08\u53ea\u8ba9\u5176\u521b\u5efa\u4e00\u6b21<\/strong>\uff09\u3002<\/li>\n
                                                    4. SavedStateViewModelFactory<\/code>\u7c7b\uff0c\u652f\u6301\u521b\u5efa\uff0c\u6709<\/strong>Application<\/code>\u3001\u6709<\/strong>SavedStateHandle<\/code>\u3001\u4e24\u8005\u90fd\u6709<\/strong>\u3001\u4e24\u8005\u90fd\u6ca1\u6709<\/strong>\u7684ViewModel<\/code>\uff0c\u8be6\u7ec6\u89c1\u4e0a\u9762-\u8bf4\u660e\u3002\n
                                                        \n
                                                      • \u53ef\u4ee5\u5904\u7406\u5982\u4e0bViewModel<\/code>\uff1a<\/li>\n
                                                      • class MyViewModel : ViewModel()<\/code>\uff0c\u7531NewInstanceFactory<\/code>\u521b\u5efa\u3002<\/li>\n
                                                      • class MyViewModel(application: Application) : AndroidViewModel(application)<\/code>\uff0c\u7531AndroidViewModelFactory<\/code>\u521b\u5efa\u3002<\/li>\n
                                                      • class MyViewModel(val handle: SavedStateHandle) : ViewModel()<\/code>\uff0c\u7531SavedStateViewModelFactory<\/code>\u521b\u5efa\u3002<\/li>\n
                                                      • class MyViewModel(application: Application, val handle: SavedStateHandle) : AndroidViewModel(application)<\/code>\uff0c\u7531SavedStateViewModelFactory<\/code>\u521b\u5efa\u3002<\/li>\n<\/ul>\n<\/li>\n
                                                      • \u5173\u7cfb<\/strong>\uff1a\u4e00\u4e2a<\/strong>androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\uff0c\u5bf9\u5e94\u4e00\u4e2a<\/strong>SavedStateViewModelFactory<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                        \u83b7\u53d6CreationExtras<\/h2>\n
                                                        CreationExtras<\/h3>\n
                                                        CreationExtras\u7c7b<\/strong><\/p>\n
                                                        public abstract class CreationExtras internal constructor() {\n    \/\/ \u5b58\u50a8\u7684\u6570\u636e\u96c6\u5408\uff0ckey\u4e3aKey\uff0c\u503c\u4e3aAny\u3002\n    internal val map: MutableMap<Key<*>, Any?> = mutableMapOf()\n\n    \/\/ CreationExtras\u5143\u7d20\u7684\u952e\u3002\n    public interface Key<T>\n\n    \/\/ \u901a\u8fc7key\u83b7\u53d6\u76f8\u5173\u8054\u7684\u5143\u7d20\n    public abstract operator fun <T> get(key: Key<T>): T?\n\n    \/\/ CreationExtras-\u7a7a\u5b9e\u73b0\n    public object Empty : CreationExtras() {\n        override fun <T> get(key: Key<T>): T? = null\n    }\n}\n\n\/\/ CreationExtras-\u53ef\u4fee\u6539\n\/\/ initialExtras\uff1a\u4e3a\u521d\u59cb\u5316\u503c\uff0c\u9ed8\u8ba4\u4e3a\u7a7a\u3002\npublic class MutableCreationExtras(initialExtras: CreationExtras = Empty) : CreationExtras() {\n\n    init {\n        map.putAll(initialExtras.map)\n    }\n\n    \/\/ \u8bbe\u7f6e\n    public operator fun <T> set(key: Key<T>, t: T) {\n        map[key] = t\n    }\n\n    \/\/ \u83b7\u53d6\n    public override fun <T> get(key: Key<T>): T? {\n        @Suppress(\"UNCHECKED_CAST\")\n        return map[key] as T?\n    }\n}\n<\/code><\/pre>\n
                                                        CreationExtras<\/code>\uff0c\u4e3a\u4f20\u5165Factory<\/code>\u7684create()<\/code>\u65b9\u6cd5\u7684\u7b80\u5355\u5bf9\u8c61\uff08\u7c7b\u4f3cmap<\/code>\uff09\uff0c\u4e3a\u5de5\u5382\u521b\u5efa<\/strong>ViewModel<\/code>\u63d0\u4f9b\u989d\u5916<\/strong>\u4fe1\u606f\u3002\u5b83\u5141\u8bb8\u4f7fFactory<\/code>\u5b9e\u73b0\u65e0\u72b6\u6001\uff0c\u8fd9\u4f7f\u5f97\u5de5\u5382\u6ce8\u5165\u66f4\u5bb9\u6613\uff0c\u56e0\u4e3a\u4e0d\u9700\u8981\u5728\u6784\u5efa\u65f6\u63d0\u4f9b\u6240\u6709\u4fe1\u606f\u3002<\/p>\n
                                                        \n  \u8bf4\u660e\uff1a<\/p>\n
                                                          \n
                                                        1. CreationExtras<\/code>\u6709\u4e24\u4e2a\u5b9e\u73b0\u7c7b\uff0cEmpty<\/code>\uff08\u7a7a\uff09\u3001MutableCreationExtras<\/code>\uff08\u53ef\u4fee\u6539\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                          \u9ed8\u8ba4CreationExtras<\/h3>\n
                                                          \u5728\u521b\u5efaViewModelProvider<\/code>\u7c7b\u65f6\uff0c\u5982\u679cCreationExtras<\/code>\u672a\u6307\u5b9a\uff0c\u5219\u9ed8\u8ba4<\/strong>\u4e3aViewModelProviders.getDefaultCreationExtras(owner)<\/code>\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e00\u4e0b\u4ed6\u7684\u5b9e\u73b0\u3002<\/p>\n
                                                          internal fun getDefaultCreationExtras(owner: ViewModelStoreOwner): CreationExtras =\n    if (owner is HasDefaultViewModelProviderFactory) {\n        owner.defaultViewModelCreationExtras\n    } else {\n        CreationExtras.Empty\n    }\n<\/code><\/pre>\n
                                                          ViewModelProviders.getDefaultCreationExtras(owner)<\/code>\u65b9\u6cd5\uff0c\u5982\u679cowner<\/code>\u5b9e\u73b0HasDefaultViewModelProviderFactory<\/code>\u63a5\u53e3\uff0c\u5219\u83b7\u53d6\u5176\u63d0\u4f9b\u7684CreationExtras<\/code>\uff0c\u5426\u5219\u4f7f\u7528CreationExtras.Empty<\/code>\uff08\u7a7a\uff09\u3002<\/p>\n
                                                          HasDefaultViewModelProviderFactory\u7c7b<\/strong><\/p>\n
                                                          public interface HasDefaultViewModelProviderFactory {\n    \/\/ \u9ed8\u8ba4Factory\n    public val defaultViewModelProviderFactory: ViewModelProvider.Factory\n    \/\/ \u9ed8\u8ba4CreationExtras\n    public val defaultViewModelCreationExtras: CreationExtras\n        get() = CreationExtras.Empty\n}\n<\/code><\/pre>\n
                                                          HasDefaultViewModelProviderFactory<\/code>\u63a5\u53e3\uff0c\u4e3a\u6807\u8bb0<\/strong>\u662f\u5426\u53ef\u4ee5\u83b7\u53d6\u5230\u9ed8\u8ba4<\/strong>Factory<\/code>\uff08\u8be6\u7ec6\u89c1\u4e0a\u9762-\u83b7\u53d6Factory<\/strong>\uff09\u3001\u9ed8\u8ba4<\/strong>CreationExtras<\/code>\u3002<\/p>\n
                                                          androidx<\/code>\u7684Activity<\/code>\u548cFragment<\/code>\u90fd\u5df2\u7ecf\u5b9e\u73b0\u4e86HasDefaultViewModelProviderFactory<\/code>\uff0c\u6211\u4eec\u6765\u5206\u522b\u770b\u4e00\u4e0b\u5b83\u4eec\u7684defaultViewModelCreationExtras<\/code>\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n
                                                          Activity<\/h4>\n
                                                          androidx.activity.ComponentActivity\u7c7b<\/strong><\/p>\n
                                                          open class ComponentActivity() :\n    androidx.core.app.ComponentActivity(),\n    ContextAware,\n    LifecycleOwner,\n    ViewModelStoreOwner,\n    HasDefaultViewModelProviderFactory,\n    SavedStateRegistryOwner,\n    OnBackPressedDispatcherOwner,\n    ActivityResultRegistryOwner,\n    ActivityResultCaller,\n    OnConfigurationChangedProvider,\n    OnTrimMemoryProvider,\n    OnNewIntentProvider,\n    OnMultiWindowModeChangedProvider,\n    OnPictureInPictureModeChangedProvider,\n    OnUserLeaveHintProvider,\n    MenuHost,\n    FullyDrawnReporterOwner {\n\n    @get:CallSuper\n    override val defaultViewModelCreationExtras: CreationExtras\n        get() {\n            \/\/ \u521b\u5efaCreationExtras\n            val extras = MutableCreationExtras()\n            if (application != null) {\n                \/\/ \u5b58\u5165Application\n                extras[APPLICATION_KEY] = application\n            }\n            \/\/ \u5b58\u5165SavedStateRegistryOwner\n            extras[SAVED_STATE_REGISTRY_OWNER_KEY] = this\n            \/\/ \u5b58\u5165ViewModelStoreOwner\n            extras[VIEW_MODEL_STORE_OWNER_KEY] = this\n            val intentExtras = intent?.extras\n            if (intentExtras != null) {\n                \/\/ \u5b58\u5165\u53c2\u6570\n                extras[DEFAULT_ARGS_KEY] = intentExtras\n            }\n            return extras\n        }\n}\n<\/code><\/pre>\n
                                                          Fragment<\/h4>\n
                                                          androidx.fragment.app.Fragment\u7c7b<\/strong><\/p>\n
                                                          public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener, LifecycleOwner,\n        ViewModelStoreOwner, HasDefaultViewModelProviderFactory, SavedStateRegistryOwner,\n        ActivityResultCaller {\n\n    ViewModelProvider.Factory mDefaultFactory;\n\n    @NonNull\n    @Override\n    @CallSuper\n    public CreationExtras getDefaultViewModelCreationExtras() {\n        Application application = null;\n        Context appContext = requireContext().getApplicationContext();\n        while (appContext instanceof ContextWrapper) {\n            if (appContext instanceof Application) {\n                application = (Application) appContext;\n                break;\n            }\n            appContext = ((ContextWrapper) appContext).getBaseContext();\n        }\n        if (application == null && FragmentManager.isLoggingEnabled(Log.DEBUG)) {\n            Log.d(FragmentManager.TAG, \"Could not find Application instance from \"\n                    + \"Context \" + requireContext().getApplicationContext() + \", you will \"\n                    + \"not be able to use AndroidViewModel with the default \"\n                    + \"ViewModelProvider.Factory\");\n        }\n        \/\/ \u521b\u5efaCreationExtras\n        MutableCreationExtras extras = new MutableCreationExtras();\n        if (application != null) {\n            \/\/ \u5b58\u5165Application\n            extras.set(ViewModelProvider.AndroidViewModelFactory.APPLICATION_KEY, application);\n        }\n        \/\/ \u5b58\u5165SavedStateRegistryOwner\n        extras.set(SavedStateHandleSupport.SAVED_STATE_REGISTRY_OWNER_KEY, this);\n        \/\/ \u5b58\u5165ViewModelStoreOwner\n        extras.set(SavedStateHandleSupport.VIEW_MODEL_STORE_OWNER_KEY, this);\n        if (getArguments() != null) {\n            \/\/ \u5b58\u5165\u53c2\u6570\n            extras.set(SavedStateHandleSupport.DEFAULT_ARGS_KEY, getArguments());\n        }\n        return extras;\n    }\n}\n<\/code><\/pre>\n
                                                          androidx<\/code>\u7684Activity<\/code>\u548cFragment<\/code>\u7684getDefaultViewModelCreationExtras()<\/code>\u5b9e\u73b0\u76f8\u540c\uff0c\u90fd\u662f\u6bcf\u6b21\u521b\u5efa\u65b0\u7684MutableCreationExtras<\/code>\u5e76\u5b58\u5165Application<\/code>\u3001SavedStateRegistryOwner<\/code>\u3001ViewModelStoreOwner<\/code>\u3001\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570<\/strong>\uff0c\u4ee5\u65b9\u4fbf\u540e\u7eedcreate()<\/code>\u65f6\u4f7f\u7528\u3002<\/p>\n
                                                          \u5c0f\u7ed3<\/h3>\n
                                                          \n  \u8bf4\u660e\uff1a<\/p>\n
                                                            \n
                                                          1. CreationExtras<\/code>\uff1a\u4f20\u5165Factory<\/code>\u7684create()<\/code>\u65b9\u6cd5\u7684\u7b80\u5355\u5bf9\u8c61\uff08\u7c7b\u4f3cmap<\/code>\uff09\uff0c\u4e3a\u5de5\u5382\u521b\u5efa<\/strong>ViewModel<\/code>\u63d0\u4f9b\u989d\u5916<\/strong>\u4fe1\u606f\u3002\u5b83\u5141\u8bb8\u4f7fFactory<\/code>\u5b9e\u73b0\u65e0\u72b6\u6001\uff0c\u8fd9\u4f7f\u5f97\u5de5\u5382\u6ce8\u5165\u66f4\u5bb9\u6613\uff0c\u56e0\u4e3a\u4e0d\u9700\u8981\u5728\u6784\u5efa\u65f6\u63d0\u4f9b\u6240\u6709\u4fe1\u606f\u3002<\/li>\n
                                                          2. HasDefaultViewModelProviderFactory<\/code>\uff1a\u662f\u5426\u6709\u9ed8\u8ba4<\/strong>Factory<\/code>\uff0c\u901a\u8fc7\u5b83\u7684\u5b50\u7c7b<\/strong>\u53ef\u4ee5\u83b7\u53d6\u5230\u9ed8\u8ba4<\/strong>Factory<\/code>\uff08\u8be6\u7ec6\u89c1\u4e0a\u9762-\u83b7\u53d6Factory<\/strong>\uff09\u3001\u9ed8\u8ba4<\/strong>CreationExtras<\/code>\uff0candroidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u90fd\u5df2\u7ecf\u5b9e\u73b0\u4e86HasDefaultViewModelProviderFactory<\/code>\u3002<\/li>\n
                                                          3. androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u5b9e\u73b0HasDefaultViewModelProviderFactory<\/code>\uff0c\u5176getDefaultViewModelCreationExtras()<\/code>\u65b9\u6cd5\u6bcf\u6b21\u521b\u5efa\u65b0\u7684<\/strong>MutableCreationExtras<\/code>\u5e76\u8fd4\u56de<\/strong>\uff08\u521b\u5efa<\/strong>\u4f1a\u5b58\u5165Application<\/code>\u3001SavedStateRegistryOwner<\/code>\u3001ViewModelStoreOwner<\/code>\u3001\u5f53\u524d\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570<\/strong>\uff0c\u4ee5\u65b9\u4fbf\u540e\u7eedcreate()<\/code>\u65f6\u4f7f\u7528\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                            \u83b7\u53d6ViewModel<\/h2>\n
                                                            ViewModelProvider–> get\u65b9\u6cd5<\/strong><\/p>\n
                                                            @MainThread\npublic actual operator fun <T : ViewModel> get(modelClass: KClass<T>): T =\n    impl.getViewModel(modelClass)\n\n@MainThread\npublic open operator fun <T : ViewModel> get(modelClass: Class<T>): T =\n    \/\/ \u8c03\u7528\u7684\u662f\u4e0a\u9762get(modelClass: KClass<T>)\n    get(modelClass.kotlin)\n\n@MainThread\npublic actual operator fun <T : ViewModel> get(key: String, modelClass: KClass<T>): T =\n    impl.getViewModel(modelClass, key)\n\n@MainThread\npublic open operator fun <T : ViewModel> get(key: String, modelClass: Class<T>): T =\n    impl.getViewModel(modelClass.kotlin, key)\n<\/code><\/pre>\n
                                                            ViewModelProvider<\/code>\u7684get()<\/code>\u65b9\u6cd5\uff0c\u652f\u6301\u901a\u8fc7Java<\/code>\u7684Class<\/code>\u3001Kotlin<\/code>\u7684KClass<\/code>\u3001\u6307\u5b9akey<\/code>\uff0c\u83b7\u53d6\u5bf9\u5e94\u7684ViewModel<\/code>\uff0c\u4ed6\u7684\u5177\u4f53\u5b9e\u73b0\u662f\u901a\u8fc7ViewModelProviderImpl<\/code>\u7c7b\u7684getViewModel()<\/code>\u65b9\u6cd5\u5b9e\u73b0\u7684\uff0c\u6211\u4eec\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u3002<\/p>\n
                                                            internal class ViewModelProviderImpl(\n    private val store: ViewModelStore,\n    private val factory: ViewModelProvider.Factory,\n    private val extras: CreationExtras,\n) {\n\n    constructor(\n        owner: ViewModelStoreOwner,\n        factory: ViewModelProvider.Factory,\n        extras: CreationExtras,\n    ) : this(owner.viewModelStore, factory, extras)\n\n    @Suppress(\"UNCHECKED_CAST\")\n    internal fun <T : ViewModel> getViewModel(\n        modelClass: KClass<T>,\n        \/\/ key\uff0c\u9ed8\u8ba4\u4e3a\uff1aandroidx.lifecycle.ViewModelProvider.DefaultKey:\u5168\u8def\u5f84\u7c7b\u540d\u3002\n        key: String = ViewModelProviders.getDefaultKey(modelClass),\n    ): T {\n        \/\/ \u4eceViewModelStore\u4e2d\u83b7\u53d6\n        val viewModel = store[key]\n        if (modelClass.isInstance(viewModel)) {\n            \/\/ viewModel\u4e0d\u4e3a\u7a7a\uff0c\u5e76\u4e14\u662f\u76ee\u6807\u7c7bmodelClass\u7684\u5b9e\u4f8b\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u3002\n            if (factory is ViewModelProvider.OnRequeryFactory) {\n                factory.onRequery(viewModel!!)\n            }\n            \/\/ \u8fd4\u56de\u627e\u5230\u7684viewModel\n            return viewModel as T\n        } else {\n            @Suppress(\"ControlFlowWithEmptyBody\") if (viewModel != null) {\n                \/\/ TODO: log a warning.\n            }\n        }\n        \/\/ \u4ee5\u4e0b\u4e3a\uff0c\u6ca1\u6709\u627e\u5230ViewModel\uff0c\u5219\u76f4\u63a5\u521b\u5efa\uff0c\u5e76\u5b58\u5165\u5230ViewModelStore\u4e2d\u3002\n\n        \/\/ \u521b\u5efaCreationExtras\uff0c\u5e76\u628a\u4e4b\u524d\u7684extras\u5b58\u5165\u3002\n        val extras = MutableCreationExtras(extras)\n        \/\/ \u5b58\u5165key\n        extras[ViewModelProviders.ViewModelKey] = key\n\n        \/\/ \u8fd4\u56de\u521b\u5efa\u7684viewModel\uff0c\u5e76\u5c06\u5176\u6dfb\u52a0\u5230ViewModelStore\u4e2d\u3002\n        return createViewModel(factory, modelClass, extras).also { vm -> store.put(key, vm) }\n    }\n}\n<\/code><\/pre>\n
                                                            \u5185\u90e8\u901a\u8fc7ViewModelProviders.getDefaultKey(modelClass)<\/code>\u83b7\u53d6\u9ed8\u8ba4key<\/code>\uff0c\u901a\u8fc7createViewModel(factory, modelClass, extras)<\/code> \u521b\u5efaViewModel<\/code>\uff0c\u6211\u4eec\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u3002<\/p>\n
                                                            internal object ViewModelProviders {\n\n    private const val VIEW_MODEL_PROVIDER_DEFAULT_KEY: String =\n        \"androidx.lifecycle.ViewModelProvider.DefaultKey\"\n\n    \/\/ \u83b7\u53d6\u9ed8\u8ba4key\n    internal fun <T : ViewModel> getDefaultKey(modelClass: KClass<T>): String {\n        val canonicalName = requireNotNull(modelClass.canonicalName) {\n            \"Local and anonymous classes can not be ViewModels\"\n        }\n        \/\/ androidx.lifecycle.ViewModelProvider.DefaultKey:\u5168\u8def\u5f84\u7c7b\u540d\n        return \"$VIEW_MODEL_PROVIDER_DEFAULT_KEY:$canonicalName\"\n    }\n}\n<\/code><\/pre>\n
                                                            internal actual fun <VM : ViewModel> createViewModel(\n    factory: ViewModelProvider.Factory,\n    modelClass: KClass<VM>,\n    extras: CreationExtras\n): VM {\n    return try {\n        \/\/ \u901a\u8fc7ViewModelProvider.Factory\u7684create(modelClass, extras)\u65b9\u6cd5\u521b\u5efa\n        factory.create(modelClass, extras)\n    } catch (e: AbstractMethodError) {\n        try {\n            factory.create(modelClass.java, extras)\n        } catch (e: AbstractMethodError) {\n            factory.create(modelClass.java)\n        }\n    }\n}\n<\/code><\/pre>\n
                                                            ViewModelProviderImpl<\/code>\u7684getViewModel(modelClass,key)<\/code>\u65b9\u6cd5\uff0c\u4f1a\u5148\u4eceViewModelStore<\/code>\u4e2d\u83b7\u53d6ViewModel<\/code>\uff0c\u5982\u679c\u6709\u5e76\u4e14\u662f\u76ee\u6807\u7c7b<\/strong>\u7684\u5b9e\u4f8b\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\uff1b\u5426\u5219\u4f7f\u7528Factory<\/code>\u76f4\u63a5\u521b\u5efa\uff0c\u5e76\u5b58\u5165\u5230ViewModelStore<\/code>\u4e2d\uff0c\u4ee5\u4fbf\u540e\u7eed\u83b7\u53d6\u3002<\/p>\n
                                                            \n  \u8bf4\u660e\uff1a<\/p>\n
                                                              \n
                                                            1. ViewModelProviderImpl<\/code>\u7684getViewModel(modelClass,key)<\/code>\u65b9\u6cd5\uff0ckey<\/code>\u9ed8\u8ba4\u4e3a\uff1aandroidx.lifecycle.ViewModelProvider.DefaultKey:\u5168\u8def\u5f84\u7c7b\u540d<\/strong>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                              \u5c0f\u7ed3<\/h3>\n
                                                              \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                \n
                                                              1. ViewModelProvider<\/code>\u7684get()<\/code>\u65b9\u6cd5\uff0c\u5176\u83b7\u53d6<\/strong>\u9700\u8981\u6838\u5fc3\u7c7b<\/strong>ViewModelStore<\/code>\uff08\u4fdd\u5b58<\/strong>\u3001\u83b7\u53d6<\/strong>ViewModel<\/code>\uff09\u3001ViewModelProvider.Factory<\/code>\uff08\u521b\u5efa<\/strong>ViewModel<\/code>\uff09\u3001CreationExtras<\/code>\uff08\u8f85\u52a9\u521b\u5efa<\/strong>ViewModel<\/code>\u7528\uff09\u3002<\/li>\n
                                                              2. ViewModelProvider<\/code>\u7684get()<\/code>\u65b9\u6cd5\uff0c\u652f\u6301\u901a\u8fc7\uff0c\u6307\u5b9akey<\/code>\uff08\u9ed8\u8ba4\u4e3a\uff1aandroidx.lifecycle.ViewModelProvider.DefaultKey:\u5168\u8def\u5f84\u7c7b\u540d<\/strong>\uff09\u3001Class<\/code>\u6216KClass<\/code>\uff08\u4e8c\u9009\u4e00\uff09\uff0c\u83b7\u53d6\u5bf9\u5e94\u7684ViewModel<\/code>\u3002\u5176\u4f1a\u5148\u4eceViewModelStore<\/code>\u4e2d\u83b7\u53d6ViewModel<\/code>\uff0c\u5982\u679c\u6709\u5e76\u4e14\u662f\u76ee\u6807\u7c7b<\/strong>\u7684\u5b9e\u4f8b\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\uff1b\u5426\u5219\u4f7f\u7528Factory<\/code>\u76f4\u63a5\u521b\u5efa<\/strong>\uff08CreationExtras<\/code>\u8f85\u52a9\u521b\u5efa<\/strong>\uff09\uff0c\u5e76\u5b58\u5165<\/strong>\u5230ViewModelStore<\/code>\u4e2d\uff0c\u4ee5\u4fbf\u540e\u7eed\u83b7\u53d6\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                \u4e3e\u4f8b\u8bb2\u89e3\uff1a<\/strong><\/p>\n
                                                                \u4ee5\u5728androidx<\/code>\u7684Activity<\/code>\u5185\u83b7\u53d6\u65e0\u53c2\u6784\u9020\u65b9\u6cd5<\/strong>ViewModel<\/code>\u4e3a\u4f8b\uff0c\u8bb2\u89e3\u4ee3\u7801\u6d41\u7a0b\u3002<\/p>\n
                                                                \u58f0\u660eViewModel<\/code><\/p>\n
                                                                class MyViewModel : ViewModel() {\n\n    override fun onCleared() {\n        super.onCleared()\n    }\n}\n<\/code><\/pre>\n
                                                                \u83b7\u53d6ViewModel<\/code><\/p>\n
                                                                class MyActivity : AppCompatActivity() {\n\n    override fun onCreate(savedInstanceState: Bundle?) {\n        \/\/ \u83b7\u53d6ViewModel\n        val viewModel = ViewModelProvider(this).get(MyViewModel::class.java)\n    }\n}\n<\/code><\/pre>\n
                                                                \n  \u793a\u4f8b\u4ee3\u7801\u6d41\u7a0b\uff1a
                                                                \n  1. \u521b\u5efaViewModelProvider<\/code>\uff0c\u4f20\u5165\u7684\u662fComponentActivity<\/code>\uff0c\u5b83\u7684ViewModelStore<\/code>\u4e3aComponentActivity<\/code>\u63d0\u4f9b\u7684ViewModelStore<\/code>\uff0c\u5b83\u7684Factory<\/code>\u4e3aComponentActivity<\/code>\u63d0\u4f9b\u7684\u9ed8\u8ba4<\/strong>Factory<\/code>\uff08SavedStateViewModelFactory<\/code>\uff09\uff0c\u5b83\u7684CreationExtras<\/code>\u4e3aComponentActivity<\/code>\u63d0\u4f9b\u7684\u9ed8\u8ba4<\/strong>CreationExtras<\/code>\uff08MutableCreationExtras<\/code>\uff0c\u5e76\u6709\u4f20\u5165\u4e00\u4e9b\u53c2\u6570\uff0c\u7528\u4e8e\u521b\u5efaSavedStateHandle<\/code>\uff09\u3002
                                                                \n  2. ViewModelProvider<\/code>\u7684get()<\/code>\u65b9\u6cd5\uff0c\u5148\u4eceViewModelStore<\/code>\u4e2d\u83b7\u53d6ViewModel<\/code>\uff0c\u5982\u679c\u6709\u5e76\u4e14\u662f\u76ee\u6807\u7c7b<\/strong>\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\uff0c\u5426\u5219\u4f7f\u7528Factory<\/code>\uff08SavedStateViewModelFactory<\/code>\uff09\u76f4\u63a5\u521b\u5efa<\/strong>\uff0c\u5e76\u5b58\u5165<\/strong>\u5230ViewModelStore<\/code>\u4e2d\uff0c\u4ee5\u4fbf\u540e\u7eed\u83b7\u53d6\u3002
                                                                \n  3. SavedStateViewModelFactory<\/code>\u7684create()<\/code>\u65b9\u6cd5\uff0c\u6700\u7ec8\u4f1a\u8c03\u7528NewInstanceFactory<\/code>\u7684create()<\/code>\u65b9\u6cd5\u521b\u5efaViewModel<\/code>\u3002\uff08\u56e0\u4e3a\u83b7\u53d6\u7684MyViewModel<\/code>\u672a\u4f7f\u7528SavedStateHandle<\/code>\uff0c\u6240\u4ee5\u4f1a\u4f7f\u7528AndroidViewModelFactory<\/code>\u521b\u5efa\u3002\u53c8\u56e0\u4e3aMyViewModel<\/code>\u672a\u7ee7\u627fAndroidViewModel<\/code>\uff0c\u6240\u4ee5\u4f1a\u4f7f\u7528NewInstanceFactory<\/code>\u521b\u5efa\uff09\n<\/p><\/blockquote>\n
                                                                viewModels()\u6269\u5c55\u65b9\u6cd5<\/h2>\n
                                                                Activity<\/h3>\n
                                                                public inline fun <reified VM : ViewModel> ComponentActivity.viewModels(\n    noinline extrasProducer: (() -> CreationExtras)? = null,\n    noinline factoryProducer: (() -> Factory)? = null\n): Lazy<VM> {\n    \/\/ \u4f20\u5165\u7684Factory\u4e3a\u7a7a\uff0c\u5219\u4f7f\u7528ComponentActivity\u7684defaultViewModelProviderFactory\u63d0\u4f9b\u7684\u503c\uff0c\u8be6\u7ec6\u89c1-\u83b7\u53d6Factory\u3002\n    val factoryPromise = factoryProducer ?: { defaultViewModelProviderFactory }\n\n    return ViewModelLazy(\n        VM::class,\n        { viewModelStore },\n        factoryPromise,\n        \/\/ \u4f20\u5165\u7684CreationExtras\u4e3a\u7a7a\uff0c\u5219\u4f7f\u7528ComponentActivity\u7684defaultViewModelCreationExtras\u63d0\u4f9b\u7684\u503c\uff0c\u8be6\u7ec6\u89c1-\u83b7\u53d6CreationExtras\u3002\n        { extrasProducer?.invoke() ?: this.defaultViewModelCreationExtras }\n    )\n}\n<\/code><\/pre>\n
                                                                ComponentActivity<\/code>\u7684viewModels()<\/code>\u6269\u5c55\u65b9\u6cd5\uff0c\u6700\u7ec8\u8c03\u7528\u7684ViewModelLazy<\/code>\u7c7b\uff08\u8be6\u7ec6\u8bb2\u89e3\u770b\u4e0b\u9762\uff09\u3002<\/p>\n
                                                                Fragment<\/h3>\n
                                                                \/\/ Fragment-viewModels\n@MainThread\npublic inline fun <reified VM : ViewModel> Fragment.viewModels(\n    noinline ownerProducer: () -> ViewModelStoreOwner = { this },\n    noinline extrasProducer: (() -> CreationExtras)? = null,\n    noinline factoryProducer: (() -> Factory)? = null\n): Lazy<VM> {\n    val owner by lazy(LazyThreadSafetyMode.NONE) { ownerProducer() }\n    return createViewModelLazy(\n        VM::class,\n        { owner.viewModelStore },\n        {\n            \/\/ \u4f20\u5165\u7684CreationExtras\u4e0d\u4e3a\u7a7a\uff0c\u5c31\u7528\u4f20\u5165\u7684\uff1b\n            \/\/ \u5426\u5219\u5982\u679cowner\u5b9e\u73b0\u4e86HasDefaultViewModelProviderFactory\uff0c\u5219\u7528owner\u7684defaultViewModelCreationExtras\u63d0\u4f9b\u7684\u9ed8\u8ba4\u503c\uff1b\n            \/\/ \u5426\u5219\u7528\u7a7a\u503c\u3002\n            extrasProducer?.invoke()\n            ?: (owner as? HasDefaultViewModelProviderFactory)?.defaultViewModelCreationExtras\n            ?: CreationExtras.Empty\n        },\n        \/\/ \u4f20\u5165\u7684Factory\u4e0d\u4e3a\u7a7a\uff0c\u5c31\u7528\u4f20\u5165\u7684\uff1b\n        \/\/ \u5426\u5219\u5982\u679cowner\u5b9e\u73b0\u4e86HasDefaultViewModelProviderFactory\uff0c\u5219\u7528owner\u7684defaultViewModelProviderFactory\u63d0\u4f9b\u7684\u9ed8\u8ba4\u503c\uff1b\n        \/\/ \u5426\u5219\u5c31\u7528\u6b64Fragment\u7684defaultViewModelProviderFactory\u63d0\u4f9b\u7684\u9ed8\u8ba4\u503c\u3002\n        factoryProducer ?: {\n            (owner as? HasDefaultViewModelProviderFactory)?.defaultViewModelProviderFactory\n                ?: defaultViewModelProviderFactory\n        })\n}\n\n\/\/ Fragment-activityViewModels\n@MainThread\npublic inline fun <reified VM : ViewModel> Fragment.activityViewModels(\n    noinline extrasProducer: (() -> CreationExtras)? = null,\n    noinline factoryProducer: (() -> Factory)? = null\n): Lazy<VM> = createViewModelLazy(\n    VM::class, \n    { requireActivity().viewModelStore },\n    \/\/ \u4f20\u5165\u7684CreationExtras\u4e3a\u7a7a\uff0c\u5219\u4f7f\u7528ComponentActivity\u7684defaultViewModelProviderFactory\u63d0\u4f9b\u7684\u503c\u3002\n    { extrasProducer?.invoke() ?: requireActivity().defaultViewModelCreationExtras },\n    \/\/ \u4f20\u5165\u7684Factory\u4e3a\u7a7a\uff0c\u5219\u4f7f\u7528ComponentActivity\u7684defaultViewModelCreationExtras\u63d0\u4f9b\u7684\u503c\u3002\n    factoryProducer ?: { requireActivity().defaultViewModelProviderFactory }\n)\n\n\/\/ Fragment-createViewModelLazy\n@MainThread\npublic fun <VM : ViewModel> Fragment.createViewModelLazy(\n    viewModelClass: KClass<VM>,\n    storeProducer: () -> ViewModelStore,\n    extrasProducer: () -> CreationExtras = { defaultViewModelCreationExtras },\n    factoryProducer: (() -> Factory)? = null\n): Lazy<VM> {\n    \/\/ \u4f20\u5165\u7684Factory\u4e3a\u7a7a\uff0c\u7528\u6b64Fragment\u7684defaultViewModelProviderFactory\u63d0\u4f9b\u7684\u9ed8\u8ba4\u503c\u3002\n    val factoryPromise = factoryProducer ?: {\n        defaultViewModelProviderFactory\n    }\n    return ViewModelLazy(viewModelClass, storeProducer, factoryPromise, extrasProducer)\n}\n<\/code><\/pre>\n
                                                                Fragment<\/code>\u7684viewModels()<\/code>\u3001activityViewModels()<\/code>\u6269\u5c55\u65b9\u6cd5\uff0c\u90fd\u662f\u8c03\u7528\u7684createViewModelLazy()<\/code>\u6269\u5c55\u65b9\u6cd5\uff0c\u5176\u6700\u7ec8\u90fd\u662f\u8c03\u7528\u7684ViewModelLazy<\/code>\u7c7b\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u4e0b\u8fd9\u4e2a\u7c7b\u3002<\/p>\n
                                                                ViewModelLazy\u7c7b<\/strong><\/p>\n
                                                                public class ViewModelLazy<VM : ViewModel> @JvmOverloads constructor(\n    private val viewModelClass: KClass<VM>,\n    private val storeProducer: () -> ViewModelStore,\n    private val factoryProducer: () -> ViewModelProvider.Factory,\n    private val extrasProducer: () -> CreationExtras = { CreationExtras.Empty }\n) : Lazy<VM> {\n    private var cached: VM? = null\n\n    override val value: VM\n        get() {\n            val viewModel = cached\n            return if (viewModel == null) {\n                val store = storeProducer()\n                val factory = factoryProducer()\n                val extras = extrasProducer()\n                \/\/ \u901a\u8fc7create\u65b9\u5f0f\u521b\u5efaViewModelProvider\n                ViewModelProvider.create(store, factory, extras)\n                    \/\/ \u83b7\u53d6\n                    .get(viewModelClass)\n                    \/\/ \u4fdd\u5b58\u5230\u7f13\u5b58\uff0c\u4ee5\u6807\u8bb0\u5df2\u7ecf\u521d\u59cb\u5316\u3002\n                    .also { cached = it }\n            } else {\n                viewModel\n            }\n        }\n\n    override fun isInitialized(): Boolean = cached != null\n}\n<\/code><\/pre>\n
                                                                ViewModelLazy<\/code>\u7c7b\uff0c\u662f\u4e00\u4e2aLazy<\/code>\u7c7b\uff0c\u5176\u6700\u7ec8\u8c03\u7528\u7684ViewModelProvider.create()<\/code>\u521b\u5efa\u7684\u3002<\/p>\n
                                                                \u5c0f\u7ed3<\/h3>\n
                                                                \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                  \n
                                                                1. ComponentActivity<\/code>\u7684viewModels()<\/code>\u6269\u5c55\u65b9\u6cd5\u3001Fragment<\/code>\u7684viewModels()<\/code>\u548cactivityViewModels()<\/code>\u6269\u5c55\u65b9\u6cd5\uff0c\u6700\u7ec8\u90fd\u662f\u8c03\u7528\u7684ViewModelLazy<\/code>\u7c7b\uff0c\u5176\u5185\u90e8\u662f\u4f7f\u7528ViewModelProvider.create()<\/code>\u521b\u5efa\u7684\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                  ViewModel\u662f\u5982\u4f55\u4fdd\u6301\u4e0d\u53d8\u7684\uff1f<\/h2>\n
                                                                  Activity<\/code>\u548cFragment<\/code>\u5728\u914d\u7f6e\u53d8\u66f4<\/strong>\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u7684\u60c5\u51b5\u4f1a\u9500\u6bc1<\/strong>\u5e76\u91cd\u65b0\u521b\u5efa<\/strong>\uff0c\u4f46\u662f\u518d\u6b21\u83b7\u53d6\u7684ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\u3002ViewModel<\/code>\u662f\u4eceViewModelStore<\/code>\u4e2d\u83b7\u53d6\u7684\uff0c\u6211\u4eec\u5206\u522b\u770b\u4e00\u4e0bandroidx<\/code>\u7684Activity<\/code>\u548cFragment<\/code>\u7684getViewModelStore()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                  Activity<\/h3>\n
                                                                  ComponentActivity–> getViewModelStore\u65b9\u6cd5<\/strong><\/p>\n
                                                                  open class ComponentActivity() :\nandroidx.core.app.ComponentActivity(),\nContextAware,\nLifecycleOwner,\nViewModelStoreOwner,\nHasDefaultViewModelProviderFactory,\nSavedStateRegistryOwner,\nOnBackPressedDispatcherOwner,\nActivityResultRegistryOwner,\nActivityResultCaller,\nOnConfigurationChangedProvider,\nOnTrimMemoryProvider,\nOnNewIntentProvider,\nOnMultiWindowModeChangedProvider,\nOnPictureInPictureModeChangedProvider,\nOnUserLeaveHintProvider,\nMenuHost,\nFullyDrawnReporterOwner {\n\nprivate var _viewModelStore: ViewModelStore? = null\n\noverride val viewModelStore: ViewModelStore\n\n    get() {\n        \/\/ \u4e0d\u80fd\u5728onCreate\u8c03\u7528\u4e4b\u524d\u83b7\u53d6ViewModel\n        checkNotNull(application) {\n            (\"Your activity is not yet attached to the \" +\n                \"Application instance. You can't request ViewModel before onCreate call.\")\n        }\n        \/\/ \u786e\u4fddViewModelStore\n        ensureViewModelStore()\n        \/\/ \u8fd4\u56deViewModelStore\n        return _viewModelStore!!\n    }\n\nprivate fun ensureViewModelStore() {\n    if (_viewModelStore == null) {\n        val nc = lastNonConfigurationInstance as NonConfigurationInstances?\n        if (nc != null) {\n            \/\/ \u4ece NonConfigurationInstances \u4e2d\u6062\u590dViewModelStore\n            _viewModelStore = nc.viewModelStore\n        }\n        if (_viewModelStore == null) {\n            \/\/ _viewModelStore\u4e3a\u7a7a\uff0c\u5219\u521b\u5efa\u3002\n            _viewModelStore = ViewModelStore()\n        }\n    }\n}\n<\/code><\/pre>\n
                                                                  \u83b7\u53d6ViewModelStore<\/code>\uff0c\u6211\u4eec\u5148\u4ecelastNonConfigurationInstance<\/code>\u4e2d\u83b7\u53d6\uff0c\u5176\u5185\u90e8\u5305\u542b\u4e86\u4e00\u4e2aviewModelStore<\/code>\uff0c\u7136\u540e\u6ca1\u6709\u6211\u4eec\u518d\u91cd\u65b0\u521b\u5efa\u65b0\u7684<\/strong>ViewModelStore<\/code>\u3002<\/p>\n
                                                                  \n  \u8bf4\u660e\uff1a
                                                                  \n  1. \u4e3a\u4ec0\u4e48ComponentActivity<\/code>\u7684mViewModelStore<\/code>\u5c5e\u6027\uff0c\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u524d<\/strong>\u5b58\u5165\u503c\uff0c\u800c\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u540e<\/strong>\u4e3a\u7a7a\uff1f
                                                                  \n  * \u56e0\u4e3aActivity<\/code>\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u540e<\/strong>\uff0c\u91cd\u65b0\u521b\u5efa\u7684Activity<\/code>\uff0cActivity<\/code>\u5bf9\u8c61\u4e3a\u65b0\u7684\uff0c\u6240\u4ee5\u5176mViewModelStore<\/code>\u5c5e\u6027\u4e3a\u521d\u59cb\u72b6\u6001\uff1a\u7a7a\u3002\n<\/p><\/blockquote>\n
                                                                  \u6211\u4eec\u5148\u6765\u5206\u6790\u4e00\u4e0blastNonConfigurationInstance<\/code>\u662f\u5982\u4f55\u88ab\u83b7\u53d6\u7684\uff0c\u7136\u540e\u518d\u6765\u770b\u4ed6\u662f\u5982\u4f55\u88ab\u8d4b\u503c\u7684\u3002<\/p>\n
                                                                  lastNonConfigurationInstance<\/code>\uff0c\u662f\u8c03\u7528\u4e86Activity<\/code>\u7684getLastNonConfigurationInstance()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                  @Nullable\npublic Object getLastNonConfigurationInstance() {\n    return mLastNonConfigurationInstances != null\n            ? mLastNonConfigurationInstances.activity : null;\n}\n<\/code><\/pre>\n
                                                                  \u8981\u60f3getLastNonConfigurationInstance()<\/code>\u4e0d\u4e3anull<\/code>\uff0c\u9996\u5148\u7684mLastNonConfigurationInstances<\/code>\u4e0d\u4e3anull<\/code>\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0bmLastNonConfigurationInstances<\/code>\u662f\u5982\u4f55\u88ab\u8d4b\u503c\u7684\u3002<\/p>\n
                                                                  @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)\nfinal void attach(Context context, ActivityThread aThread,\n        Instrumentation instr, IBinder token, int ident,\n        Application application, Intent intent, ActivityInfo info,\n        CharSequence title, Activity parent, String id,\n        NonConfigurationInstances lastNonConfigurationInstances,\n        Configuration config, String referrer, IVoiceInteractor voiceInteractor,\n        Window window, ActivityConfigCallback activityConfigCallback, IBinder assistToken,\n        IBinder shareableActivityToken) {\n    attach(context, aThread, instr, token, ident, application, intent, info, title, parent, id,\n            lastNonConfigurationInstances, config, referrer, voiceInteractor, window,\n            activityConfigCallback, assistToken, shareableActivityToken, null);\n}\n\nfinal void attach(Context context, ActivityThread aThread,\n        Instrumentation instr, IBinder token, int ident,\n        Application application, Intent intent, ActivityInfo info,\n        CharSequence title, Activity parent, String id,\n        NonConfigurationInstances lastNonConfigurationInstances,\n        Configuration config, String referrer, IVoiceInteractor voiceInteractor,\n        Window window, ActivityConfigCallback activityConfigCallback, IBinder assistToken,\n        IBinder shareableActivityToken, IBinder initialCallerInfoAccessToken) {\n    ...\n    mLastNonConfigurationInstances = lastNonConfigurationInstances;\n    ...\n}\n<\/code><\/pre>\n
                                                                  \u7ecf\u8fc7\u67e5\u627e\u5f97\u77e5mLastNonConfigurationInstances<\/code>\uff0c\u662f\u5728Activity<\/code>\u7684attach()<\/code>\u65b9\u6cd5\u88ab\u8d4b\u503c\u7684\u3002<\/p>\n
                                                                  \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u901a\u8fc7\u67e5\u770bActivity<\/code>\u7684onCreate()<\/code>\u8c03\u7528\u6808<\/strong>\u7684\u65b9\u5f0f\uff0c\u5206\u6790\u666e\u901a\u5f00\u542f<\/strong>Activity<\/code>\u548c\u914d\u7f6e\u53d8\u66f4\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u5f00\u542f<\/strong>Activity<\/code>\u7684\u533a\u522b\u3002<\/p>\n
                                                                  \u666e\u901a\u5f00\u542fActivity\u7684onCreate()\u7684\u8c03\u7528\u6808<\/strong><\/p>\n
                                                                  onCreate:11, MainActivity (com.zrq.demo)\nperformCreate:8290, Activity (android.app)\nperformCreate:8269, Activity (android.app)\ncallActivityOnCreate:1384, Instrumentation (android.app)\nperformLaunchActivity:3657, ActivityThread (android.app)\nhandleLaunchActivity:3813, ActivityThread (android.app)\nexecute:101, LaunchActivityItem (android.app.servertransaction)\nexecuteCallbacks:135, TransactionExecutor (android.app.servertransaction)\nexecute:95, TransactionExecutor (android.app.servertransaction)\nhandleMessage:2308, ActivityThread$H (android.app)\ndispatchMessage:106, Handler (android.os)\nloopOnce:201, Looper (android.os)\nloop:288, Looper (android.os)\nmain:7898, ActivityThread (android.app)\ninvoke:-1, Method (java.lang.reflect)\nrun:548, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)\nmain:936, ZygoteInit (com.android.internal.os)\n<\/code><\/pre>\n
                                                                  \u914d\u7f6e\u53d8\u66f4\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u5f00\u542fActivity\u7684onCreate()\u7684\u8c03\u7528\u6808<\/strong><\/p>\n
                                                                  onCreate:11, MainActivity (com.zrq.demo)\nperformCreate:8290, Activity (android.app)\nperformCreate:8269, Activity (android.app)\ncallActivityOnCreate:1384, Instrumentation (android.app)\nperformLaunchActivity:3657, ActivityThread (android.app)\nhandleLaunchActivity:3813, ActivityThread (android.app)\nhandleRelaunchActivityInner:5791, ActivityThread (android.app)\nhandleRelaunchActivity:5682, ActivityThread (android.app)\nexecute:71, ActivityRelaunchItem (android.app.servertransaction)\nexecute:45, ActivityTransactionItem (android.app.servertransaction)\nexecuteCallbacks:135, TransactionExecutor (android.app.servertransaction)\nexecute:95, TransactionExecutor (android.app.servertransaction)\nhandleMessage:2308, ActivityThread$H (android.app)\ndispatchMessage:106, Handler (android.os)\nloopOnce:201, Looper (android.os)\nloop:288, Looper (android.os)\nmain:7898, ActivityThread (android.app)\ninvoke:-1, Method (java.lang.reflect)\nrun:548, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)\nmain:936, ZygoteInit (com.android.internal.os)\n<\/code><\/pre>\n
                                                                  \u4e24\u8005\u5dee\u5f02\u5bf9\u6bd4<\/strong><\/p>\n
                                                                  \"2025-03-19_09-43.png\"<\/div>
                                                                  \n\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b\u666e\u901a\u5f00\u542fActivity\u7684onCreate()\u7684\u8c03\u7528\u6808<\/strong>\u5173\u952e\u4ee3\u7801\u6d41\u7a0b\uff0c\u7136\u540e\u518d\u6765\u770b\u914d\u7f6e\u53d8\u66f4\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u5f00\u542fActivity\u7684onCreate()\u7684\u8c03\u7528\u6808<\/strong>\u5173\u952e\u4ee3\u7801\u6d41\u7a0b\u3002<\/p>\n
                                                                  \u666e\u901a\u5f00\u542fActivity\u7684onCreate()\u7684\u8c03\u7528\u6808<\/strong>\u5173\u952e\u4ee3\u7801\u6d41\u7a0b<\/p>\n
                                                                  ...\nperformLaunchActivity:3657, ActivityThread (android.app)\nhandleLaunchActivity:3813, ActivityThread (android.app)\nexecute:101, LaunchActivityItem (android.app.servertransaction) \/\/ \u5dee\u5f02\n...\n<\/code><\/pre>\n
                                                                  LaunchActivityItem–> execute\u65b9\u6cd5<\/strong><\/p>\n
                                                                  @Override\npublic void execute(ClientTransactionHandler client, IBinder token,\n        PendingTransactionActions pendingActions) {\n    Trace.traceBegin(TRACE_TAG_ACTIVITY_MANAGER, \"activityStart\");\n    ActivityClientRecord r = new ActivityClientRecord(token, mIntent, mIdent, mInfo,\n            mOverrideConfig, mCompatInfo, mReferrer, mVoiceInteractor, mState, mPersistentState,\n            mPendingResults, mPendingNewIntents, mActivityOptions, mIsForward, mProfilerInfo,\n            client, mAssistToken, mShareableActivityToken, mLaunchedFromBubble,\n            mTaskFragmentToken);\n    client.handleLaunchActivity(r, pendingActions, null \/* customIntent *\/);\n    Trace.traceEnd(TRACE_TAG_ACTIVITY_MANAGER);\n}\n<\/code><\/pre>\n
                                                                  \u521b\u5efa\u4e86ActivityClientRecord<\/code>\uff08\u5176\u5185\u90e8\u5c5e\u6027lastNonConfigurationInstances<\/code>\u662f\u6ca1\u6709\u8d4b\u503c\u7684\uff0c\u4e3anull<\/code>\uff09\uff0c\u5e76\u4f20\u9012\u7ed9\u4e86ActivityThread<\/code>\uff08\u7ee7\u627f\u4e86ClientTransactionHandler<\/code>\u7c7b\uff09\u7684handleLaunchActivity()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                  ActivityThread–> handleLaunchActivity\u65b9\u6cd5<\/strong><\/p>\n
                                                                  @Override\npublic Activity handleLaunchActivity(ActivityClientRecord r,\n        PendingTransactionActions pendingActions, Intent customIntent) {\n    ...\n\n    final Activity a = performLaunchActivity(r, customIntent);\n\n    ...            \n    return a;\n}\n<\/code><\/pre>\n
                                                                  \u5c06\u503c\uff0c\u7ee7\u7eed\u4f20\u9012\u7ed9\u4e86ActivityThread<\/code>\u7684performLaunchActivity()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                  ActivityThread–> performLaunchActivity\u65b9\u6cd5<\/strong><\/p>\n
                                                                  private Activity performLaunchActivity(ActivityClientRecord r, Intent customIntent) {\n    ...\n\n    try {\n        ...\n\n        synchronized (mResourcesManager) {\n            \/\/ \u5b58\u5230mActivities\u4e2d\n            mActivities.put(r.token, r);\n        }\n\n        if (activity != null) {\n            ...\n\n            \/\/ \u5c06lastNonConfigurationInstances\u4f20\u9012\u7ed9\u4e86activity\n            activity.attach(appContext, this, getInstrumentation(), r.token,\n                    r.ident, app, r.intent, r.activityInfo, title, r.parent,\n                    r.embeddedID, r.lastNonConfigurationInstances, config,\n                    r.referrer, r.voiceInteractor, window, r.activityConfigCallback,\n                    r.assistToken, r.shareableActivityToken);\n            ...\n        }\n        ...\n\n    } catch (SuperNotCalledException e) {\n        throw e;\n\n    } catch (Exception e) {\n        ...\n    }\n\n    return activity;\n}\n<\/code><\/pre>\n
                                                                  \u5c06\u4e0a\u9762\u521a\u521b\u5efaActivityClientRecord<\/code>\uff08\u65e0<\/strong>lastNonConfigurationInstances<\/code>\uff09\u7684\u5b58\u5230ActivityThread<\/code>\u7684mActivities<\/code>\u96c6\u5408\u4e2d\uff0c\u5e76\u901a\u8fc7activity.attach()<\/code>\u65b9\u6cd5\u5c06ActivityClientRecord<\/code>\u7684lastNonConfigurationInstance<\/code>\uff08\u4e3a\u7a7a<\/strong>\uff09\u4f20\u9012\u7ed9Activity<\/code>\u3002<\/p>\n
                                                                  ActivityThread–> mActivities<\/strong><\/p>\n
                                                                  public final class ActivityThread extends ClientTransactionHandler\n        implements ActivityThreadInternal {\n    @UnsupportedAppUsage\n    final ArrayMap<IBinder, ActivityClientRecord> mActivities = new ArrayMap<>();\n}\n<\/code><\/pre>\n
                                                                  \u666e\u901a\u5f00\u542fActivity\u603b\u7ed3<\/strong><\/p>\n
                                                                  \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                    \n
                                                                  1. \u666e\u901a\u5f00\u542f<\/strong>Activity<\/code>\uff1a\u521b\u5efa<\/strong>\u4e00\u4e2a\u65b0\u7684ActivityClientRecord<\/code>\uff08\u65e0<\/strong>lastNonConfigurationInstances<\/code>\uff09\uff0c\u5e76\u5b58\u5230ActivityThread<\/code>\u7684mActivities<\/code>\u96c6\u5408\u4e2d\uff0c\u5e76\u901a\u8fc7activity.attach()<\/code>\u65b9\u6cd5\u5c06ActivityClientRecord<\/code>\u7684lastNonConfigurationInstance<\/code>\uff08\u4e3a\u7a7a<\/strong>\uff09\u4f20\u9012\u7ed9Activity<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                    \u914d\u7f6e\u53d8\u66f4\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u5f00\u542fActivity\u7684onCreate()\u7684\u8c03\u7528\u6808<\/strong>\u5173\u952e\u4ee3\u7801\u6d41\u7a0b<\/p>\n
                                                                    ...\nperformLaunchActivity:3657, ActivityThread (android.app)\nhandleLaunchActivity:3813, ActivityThread (android.app)\nhandleRelaunchActivityInner:5791, ActivityThread (android.app) \/\/ \u5dee\u5f02\nhandleRelaunchActivity:5682, ActivityThread (android.app) \/\/ \u5dee\u5f02\nexecute:71, ActivityRelaunchItem (android.app.servertransaction) \/\/ \u5dee\u5f02\nexecute:45, ActivityTransactionItem (android.app.servertransaction) \/\/ \u5dee\u5f02\n...\n<\/code><\/pre>\n
                                                                    ActivityTransactionItem–> execute\u65b9\u6cd5<\/strong><\/p>\n
                                                                    @Override\npublic final void execute(ClientTransactionHandler client, IBinder token,\n        PendingTransactionActions pendingActions) {\n    final ActivityClientRecord r = getActivityClientRecord(client, token);\n\n    execute(client, r, pendingActions);\n}\n<\/code><\/pre>\n
                                                                    @NonNull ActivityClientRecord getActivityClientRecord(\n        @NonNull ClientTransactionHandler client, IBinder token) {\n    final ActivityClientRecord r = client.getActivityClient(token);\n    ...\n    return r;\n}\n<\/code><\/pre>\n
                                                                    ActivityTransactionItem<\/code>\u7684execute()<\/code>\u65b9\u6cd5\uff0c\u901a\u8fc7client<\/code>\uff08ActivityThread<\/code>\uff09\u7684getActivityClient()<\/code>\u83b7\u53d6ActivityClientRecord<\/code>\uff0c\u5e76\u4f20\u7ed9\u4e86ActivityRelaunchItem<\/code>\u7684execute()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                    ActivityThread–> getActivityClient\u65b9\u6cd5<\/strong><\/p>\n
                                                                    @Override\npublic ActivityClientRecord getActivityClient(IBinder token) {\n    return mActivities.get(token);\n}\n<\/code><\/pre>\n
                                                                    ActivityRelaunchItem–> execute\u65b9\u6cd5<\/strong><\/p>\n
                                                                    @Override\npublic void preExecute(ClientTransactionHandler client, IBinder token) {\n    mActivityClientRecord = client.prepareRelaunchActivity(token, mPendingResults,\n            mPendingNewIntents, mConfigChanges, mConfig, mPreserveWindow);\n}\n\n@Override\npublic void execute(ClientTransactionHandler client, ActivityClientRecord r,\n        PendingTransactionActions pendingActions) {\n    if (mActivityClientRecord == null) {\n        if (DEBUG_ORDER) Slog.d(TAG, \"Activity relaunch cancelled\");\n        return;\n    }\n    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, \"activityRestart\");\n    client.handleRelaunchActivity(mActivityClientRecord, pendingActions);\n    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);\n}\n<\/code><\/pre>\n
                                                                    ActivityRelaunchItem<\/code>\u7684execute()<\/code>\u65b9\u6cd5\uff0c\u4ed6\u4f1a\u5c06preExecute()<\/code>\u65b9\u6cd5\u83b7\u53d6\u7684mActivityClientRecord<\/code>\u4f20\u9012\u7ed9ActivityThread<\/code>\u7684handleRelaunchActivity()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                    \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                      \n
                                                                    1. preExecute()<\/code>\u65b9\u6cd5\uff0c\u662f\u8c03\u7528\u4e86client<\/code>\uff08ActivityThread<\/code>\uff09\u7684prepareRelaunchActivity()<\/code>\u83b7\u53d6ActivityClientRecord<\/code>\u3002\u5176\u5185\u90e8\u662f\u5148\u5224\u65admRelaunchingActivities<\/code>\u5185\u90e8\u662f\u5426\u6709\u6b64token<\/code>\u7684\uff0c\u5982\u679c\u6709\u5219\u8fd4\u56de\uff1b\u5982\u679c\u6ca1\u6709\u5219\u521b\u5efa\u4e00\u4e2a\u65b0\u7684ActivityClientRecord<\/code>\uff0c\u5e76\u5c06token<\/code>\u8d4b\u503c\u7ed9\u4ed6\uff0c\u5e76\u628a\u4ed6\u6dfb\u52a0\u5230mRelaunchingActivities<\/code>\u4e2d\u3002\u4fdd\u8bc1\u4e86\u4f1a\u83b7\u53d6\u5230token<\/code>\u76f8\u540c<\/strong>\u7684ActivityClientRecord<\/code>\uff0c\u5728\u6b64\u5c31\u4e0d\u5c55\u793a\u6e90\u7801\u4e86\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                      ActivityThread–> handleRelaunchActivity\u65b9\u6cd5<\/strong><\/p>\n
                                                                      @Override\npublic void handleRelaunchActivity(ActivityClientRecord tmp,\n        PendingTransactionActions pendingActions) {\n    ...\n\n    ActivityClientRecord r = mActivities.get(tmp.token);\n    ...\n\n    handleRelaunchActivityInner(r, configChanges, tmp.pendingResults, tmp.pendingIntents,\n            pendingActions, tmp.startsNotResumed, tmp.overrideConfig, \"handleRelaunchActivity\");\n    ...\n}\n<\/code><\/pre>\n
                                                                      ActivityThread<\/code>\u7684handleRelaunchActivity()<\/code>\u65b9\u6cd5\uff0c \u5176\u5185\u90e8\u8c03\u7528\u4e86ActivityThread<\/code>\u7684handleRelaunchActivityInner()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                      \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                        \n
                                                                      1. mActivities.get(tmp.token)<\/code>\uff0ctmp<\/code>\u662f\u5728\u4e0a\u9762\u901a\u8fc7ActivityThread<\/code>\u7684prepareRelaunchActivity()<\/code>\u65b9\u6cd5\u83b7\u53d6\u7684\u4e34\u65f6ActivityClientRecord<\/code>\uff0c\u5176\u4fdd\u8bc1\u4e86\u4e24\u8005token<\/code>\u76f8\u540c<\/strong>\uff0c\u6240\u4ee5\u5728\u6b64\u901a\u8fc7tmp.token<\/code>\u4ecemActivities<\/code>\u4e2d\u83b7\u53d6\uff0c\u4e5f\u662f\u80fd\u83b7\u53d6\u5230ActivityClientRecord<\/code>\u7684\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                        ActivityThread–> handleRelaunchActivityInner\u65b9\u6cd5<\/strong><\/p>\n
                                                                        private void handleRelaunchActivityInner(ActivityClientRecord r, int configChanges,\n        List<ResultInfo> pendingResults, List<ReferrerIntent> pendingIntents,\n        PendingTransactionActions pendingActions, boolean startsNotResumed,\n        Configuration overrideConfig, String reason) {\n    ...\n\n    handleDestroyActivity(r, false, configChanges, true, reason);\n\n    ...\n\n    handleLaunchActivity(r, pendingActions, customIntent);\n}\n<\/code><\/pre>\n
                                                                        ActivityThread<\/code>\u7684handleRelaunchActivityInner()<\/code>\u65b9\u6cd5\uff0c \u5176\u5185\u90e8\u5148\u8c03\u7528\u4e86\u5904\u7406\u9500\u6bc1\u65b9\u6cd5<\/strong>handleDestroyActivity()<\/code>\uff08getNonConfigInstance<\/code>\u53c2\u6570\u4e3ature<\/code>\uff09\uff0c\u7136\u540e\u8c03\u7528\u4e86\u5904\u7406\u542f\u52a8\u65b9\u6cd5<\/strong>handleLaunchActivity()<\/code>\u3002<\/p>\n
                                                                        ActivityThread<\/code>\u7684handleLaunchActivity()<\/code>\u65b9\u6cd5\uff0c\u5df2\u7ecf\u5728\u4e0a\u9762\u8bb2\u89e3\u4e86\uff08\u8be6\u7ec6\u770b\u4e0a\u9762\uff1a\u666e\u901a\u5f00\u542fActivity<\/strong>\uff09\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u5148\u770bActivityThread<\/code>\u7684handleDestroyActivity()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                        ActivityThread–> handleDestroyActivity\u65b9\u6cd5<\/strong><\/p>\n
                                                                        @Override\npublic void handleDestroyActivity(ActivityClientRecord r, boolean finishing, int configChanges,\n        boolean getNonConfigInstance, String reason) {\n    performDestroyActivity(r, finishing, configChanges, getNonConfigInstance, reason);\n    ...\n}\n<\/code><\/pre>\n
                                                                        ActivityThread<\/code>\u7684handleDestroyActivity()<\/code>\u65b9\u6cd5\uff0c\u5176\u5185\u90e8\u8c03\u7528\u4e86ActivityThread<\/code>\u7684performDestroyActivity()<\/code>\u65b9\u6cd5\uff08getNonConfigInstance<\/code>\u53c2\u6570\u4e3ature<\/code>\uff09\u3002<\/p>\n
                                                                        ActivityThread–> performDestroyActivity\u65b9\u6cd5<\/strong><\/p>\n
                                                                        void performDestroyActivity(ActivityClientRecord r, boolean finishing,\n        int configChanges, boolean getNonConfigInstance, String reason) {\n    ...\n\n    if (getNonConfigInstance) {\n        try {\n            r.lastNonConfigurationInstances = r.activity.retainNonConfigurationInstances();\n        } catch (Exception e) {\n            ...\n        }\n    }\n    ...\n\n    synchronized (mResourcesManager) {\n        mActivities.remove(r.token);\n    }\n    ...\n}\n<\/code><\/pre>\n
                                                                        ActivityThread<\/code>\u7684performDestroyActivity()<\/code>\u65b9\u6cd5\uff0c\u5176\u5185\u90e8\u5224\u65ad\u4e86\uff0c\u5982\u679cgetNonConfigInstance<\/code>\u4e3atrue<\/code>\uff08\u6b64\u4f20\u5165\u4e3atrue<\/code>\uff09\uff0c\u5219\u5c06<\/strong>Activity<\/code>\u7684retainNonConfigurationInstances()<\/code>\u65b9\u6cd5\u7684\u7ed3\u679c\uff0c\u4fdd\u5b58<\/strong>\u5728\u6b64ActivityClientRecord<\/code>\u7684lastNonConfigurationInstances<\/code>\u5c5e\u6027\u4e0a\uff0c\u5e76\u5c06\u5176ActivityClientRecord<\/code>\u5728mActivities<\/code>\u4e2d\u79fb\u9664\u3002<\/p>\n
                                                                        \u914d\u7f6e\u53d8\u66f4\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u5f00\u542fActivity\u603b\u7ed3<\/strong><\/p>\n
                                                                        \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                          \n
                                                                        1. \u914d\u7f6e\u53d8\u66f4\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u5f00\u542f<\/strong>Activity<\/code>\uff1a\n
                                                                            \n
                                                                          1. performDestroyActivity()<\/code>\uff1a\u5c06\u83b7\u53d6\u7684ActivityClientRecord<\/code>\uff08\u65e0<\/strong>lastNonConfigurationInstances<\/code>\uff09\uff0c\u5c06Activity<\/code>\u7684retainNonConfigurationInstances()<\/code>\u65b9\u6cd5\u7684\u7ed3\u679c\uff0c\u4fdd\u5b58<\/strong>\u5230\u5176lastNonConfigurationInstances<\/code>\u5c5e\u6027\u4e0a\uff0c\u5e76\u5c06\u5176\u5728mActivities<\/code>\u4e2d\u79fb\u9664<\/strong>\u3002<\/li>\n
                                                                          2. handleLaunchActivity()<\/code>\uff1a\u5c06\u83b7\u53d6\u7684ActivityClientRecord<\/code>\uff08\u6709<\/strong>lastNonConfigurationInstances<\/code>\uff09\uff0c\u5b58\u5230ActivityThread<\/code>\u7684mActivities<\/code>\u96c6\u5408\u4e2d\uff0c\u5e76\u901a\u8fc7activity.attach()<\/code>\u65b9\u6cd5\u5c06ActivityClientRecord<\/code>\u7684lastNonConfigurationInstance<\/code>\uff08\u4e3a\u7a7a<\/strong>\uff09\u4f20\u9012\u7ed9Activity<\/code>\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                            \u603b\u7ed3<\/strong><\/p>\n
                                                                            \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                              \n
                                                                            1. \u666e\u901a\u5f00\u542f<\/strong>Activity<\/code>\uff1aActivity<\/code>\u7684mLastNonConfigurationInstances<\/code>\u4e3a<\/strong>null<\/code>\u3002<\/li>\n
                                                                            2. \u914d\u7f6e\u53d8\u66f4\uff08\u5982\uff1a\u5c4f\u5e55\u65cb\u8f6c\uff09\u5f00\u542f<\/strong>Activity<\/code>\uff1aActivity<\/code>\u7684mLastNonConfigurationInstances<\/code>\u4e0d\u4e3a<\/strong>null<\/code>\uff0c\u5176\u503c\u4e3a\u6b64<\/strong>Activity<\/code>\u7684retainNonConfigurationInstances()<\/code>\u65b9\u6cd5\u8fd4\u56de\u7684\u503c<\/strong>\uff08Activity<\/code>\u9500\u6bc1\u65f6\u4fdd\u5b58\u7684<\/strong>\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                              \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u4e00\u8d77\u770b\u4e00\u4e0bActivity<\/code>\u7684retainNonConfigurationInstances()<\/code>\u65b9\u6cd5\uff0c\u770b\u4e0b\u5176\u5185\u90e8\u90fd\u4fdd\u5b58\u4e86\u4ec0\u4e48\u3002<\/p>\n
                                                                              Activity–> retainNonConfigurationInstances\u65b9\u6cd5<\/strong><\/p>\n
                                                                              NonConfigurationInstances retainNonConfigurationInstances() {\n    \/\/ \u83b7\u53d6\u5230\u5f53\u524dActivity\u8981\u4fdd\u5b58\u7684\u6570\u636e\n    Object activity = onRetainNonConfigurationInstance();\n    HashMap<String, Object> children = onRetainNonConfigurationChildInstances();\n    FragmentManagerNonConfig fragments = mFragments.retainNestedNonConfig();\n\n    \/\/ We're already stopped but we've been asked to retain.\n    \/\/ Our fragments are taken care of but we need to mark the loaders for retention.\n    \/\/ In order to do this correctly we need to restart the loaders first before\n    \/\/ handing them off to the next activity.\n    mFragments.doLoaderStart();\n    mFragments.doLoaderStop(true);\n    ArrayMap<String, LoaderManager> loaders = mFragments.retainLoaderNonConfig();\n\n    if (activity == null && children == null && fragments == null && loaders == null\n            && mVoiceInteractor == null) {\n        return null;\n    }\n\n    NonConfigurationInstances nci = new NonConfigurationInstances();\n    nci.activity = activity; \/\/ \u8bb0\u5f55\u5f53\u524dActivity\u8981\u4fdd\u5b58\u7684\u6570\u636e\n    nci.children = children;\n    nci.fragments = fragments;\n    nci.loaders = loaders;\n    if (mVoiceInteractor != null) {\n        mVoiceInteractor.retainInstance();\n        nci.voiceInteractor = mVoiceInteractor;\n    }\n    return nci;\n}\n<\/code><\/pre>\n
                                                                              Activity.NonConfigurationInstances\u7c7b<\/strong><\/p>\n
                                                                              static final class NonConfigurationInstances {\n    Object activity;\n    HashMap<String, Object> children;\n    FragmentManagerNonConfig fragments;\n    ArrayMap<String, LoaderManager> loaders;\n    VoiceInteractor voiceInteractor;\n}\n<\/code><\/pre>\n
                                                                              Actiity<\/code>\u7684retainNonConfigurationInstances()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u4fdd\u7559\u4e0d\u4f1a\u56e0\u914d\u7f6e\u53d8\u66f4\u800c\u9500\u6bc1\u7684\u5bf9\u8c61<\/strong>\u3002\u5176NonConfigurationInstances<\/code>\u7c7b\u7684activity<\/code>\uff0c\u8bb0\u5f55\u5f53\u524dActivity<\/code>\u8981\u4fdd\u5b58\u7684\u6570\u636e\u3002<\/p>\n
                                                                              \u6211\u4eec\u63a5\u4e0b\u6765\uff0c\u770b\u4e00\u4e0bActivity<\/code>\u7684onRetainNonConfigurationInstance()<\/code>\u65b9\u6cd5\uff0c\u5176\u9ed8\u8ba4\u7a7a\u5b9e\u73b0<\/strong>\uff0c\u6211\u4eec\u770b\u4e00\u4e0b\u4ed6\u7684\u5b9e\u73b0\u7c7bComponentActivity<\/code>\u7684onRetainNonConfigurationInstance()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                              ComponentActivity–> onRetainNonConfigurationInstance\u65b9\u6cd5<\/strong><\/p>\n
                                                                              final override fun onRetainNonConfigurationInstance(): Any? {\n    \/\/ Maintain backward compatibility.\n    val custom = onRetainCustomNonConfigurationInstance()\n    var viewModelStore = _viewModelStore\n    if (viewModelStore == null) {\n        \/\/ viewModelStore\u4e3a\u7a7a\uff0c\u5219\u8bf4\u660e\u6b64\u65f6\u6ca1\u6709\u8c03\u7528\u8fc7getViewModelStore()\uff0c\u5219\u901a\u8fc7getLastNonConfigurationInstance()\u4ece\u91cd\u5efa\u4e4b\u524d\u7684\u83b7\u53d6\u3002\n        val nc = lastNonConfigurationInstance as NonConfigurationInstances?\n        if (nc != null) {\n            viewModelStore = nc.viewModelStore\n        }\n    }\n    if (viewModelStore == null && custom == null) {\n        return null\n    }\n    val nci = NonConfigurationInstances()\n    nci.custom = custom\n    nci.viewModelStore = viewModelStore \/\/ \u8bb0\u5f55\u5f53\u524dviewModelStore\n    return nci\n}\n<\/code><\/pre>\n
                                                                              ComponentActivity.NonConfigurationInstances\u7c7b<\/strong><\/p>\n
                                                                              internal class NonConfigurationInstances {\n    var custom: Any? = null\n    var viewModelStore: ViewModelStore? = null\n}\n<\/code><\/pre>\n
                                                                              ComponentActivity<\/code>\u7684onRetainNonConfigurationInstance()<\/code>\u65b9\u6cd5\uff08Activity<\/code>\u9500\u6bc1<\/strong>\u65f6\u8c03\u7528\uff09\uff0c\u5185\u90e8\u4fdd\u5b58\u4e86\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u524d<\/strong>\u7ef4\u62a4\u7684ViewModelStore<\/code>\u3002<\/p>\n
                                                                              \n  \u8bf4\u660e\uff1a<\/p>\n
                                                                                \n
                                                                              1. Activity<\/code>\u7684mLastNonConfigurationInstances<\/code>\uff08\u5373<\/strong>Activity.NonConfigurationInstances<\/code>\uff09\u7684activity<\/code>\uff08\u5373<\/strong>ComponentActivity.NonConfigurationInstances<\/code>\uff09\u7684viewModelStore<\/code>\uff0c\u4fdd\u5b58\u4e86\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u524d<\/strong>\u7ef4\u62a4\u7684ViewModelStore<\/code>\u3002<\/li>\n
                                                                              2. lastNonConfigurationInstance<\/code>\uff0c\u662f\u8c03\u7528\u7684getLastNonConfigurationInstance()<\/code>\u65b9\u6cd5\uff0c\u5176\u5185\u90e8\u83b7\u53d6\u7684\u662fmLastNonConfigurationInstances.activity<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                                \u5c0f\u7ed3<\/h4>\n
                                                                                \n  \u914d\u7f6e\u53d8\u66f4\u91cd\u542fActivity-ViewModel\u4fdd\u6301\u4e0d\u53d8\u7684\u4ee3\u7801\u6d41\u7a0b\uff1a<\/strong><\/p>\n
                                                                                  \n
                                                                                1. \u914d\u7f6e\u53d8\u66f4\u91cd\u542f<\/strong>Activity<\/code>\uff0c\u4f1a\u8d70ActivityThread.handleRelaunchActivity()<\/code>\u65b9\u6cd5\uff0c\u5176\uff08\u5177\u4f53handleRelaunchActivityInner()<\/code>\uff09\u5185\u90e8\u4f1a\u5148\u8d70\u9500\u6bc1<\/strong>\u6d41\u7a0b\uff0c\u540e\u8d70\u542f\u52a8<\/strong>\u6d41\u7a0b\u3002\u6b64\u5904\u8c03\u7528\u7684\u9500\u6bc1\u6d41\u7a0b<\/strong>\u4f1a\u4f20\u5165\u53c2\u6570getNonConfigInstance<\/code>\u4e3atrue<\/code>\uff0c\u4ee5\u6807\u8bb0\u4f1a\u83b7\u53d6NonConfigurationInstances<\/code>\u7684\u503c\uff08\u65e2\u6d41\u7a0b2\u7684\u503c\uff09\u3002<\/li>\n
                                                                                2. \u5728ActivityThread.performDestroyActivity()<\/code>\u65b9\u6cd5\uff0cActivityClientRecord.lastNonConfigurationInstances<\/code>\u4fdd\u5b58\u4e86Activity.retainNonConfigurationInstances()<\/code>\u65b9\u6cd5\u8fd4\u56de\u7684Activity.NonConfigurationInstances<\/code>\u5bf9\u8c61\u3002<\/li>\n
                                                                                3. \u5176\u4e2d\u7684Activity.NonConfigurationInstances.activity<\/code>\u5c5e\u6027\uff0c\u4fdd\u5b58\u4e86ComponentActivity.onRetainNonConfigurationInstance()<\/code>\u65b9\u6cd5\u8fd4\u56de\u7684ComponentActivity.NonConfigurationInstances<\/code>\u5bf9\u8c61\u3002<\/li>\n
                                                                                4. \u5176\u4e2d\u7684ComponentActivity.NonConfigurationInstances.viewModelStore<\/code>\u5c5e\u6027\uff0c\u4fdd\u5b58\u4e86\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u524d<\/strong>\u7ef4\u62a4\u7684ViewModelStore<\/code>\u3002<\/li>\n
                                                                                5. \u5728ActivityThread.performLaunchActivity()<\/code>\u65b9\u6cd5\uff0c\u8c03\u7528Activity.attach()<\/code>\u65b9\u6cd5\uff0c\u4f20\u5165\u4e86\u4fdd\u5b58\u5728ActivityClientRecord.lastNonConfigurationInstances<\/code>\u7684Activity.NonConfigurationInstances<\/code>\u5bf9\u8c61\u3002<\/li>\n
                                                                                6. Activity.attach()<\/code>\u65b9\u6cd5\uff0c\u4fdd\u5b58\u4e86\u4f20\u5165\u7684Activity.NonConfigurationInstances<\/code>\u5bf9\u8c61\u3002<\/li>\n
                                                                                7. \u901a\u8fc7\u8c03\u7528Activity.getLastNonConfigurationInstance()<\/code>\u65b9\u6cd5\uff0c\u5373\u53ef\u62ff\u5230Activity.NonConfigurationInstances.activity<\/code>\u5c5e\u6027\u4fdd\u5b58\u7684ComponentActivity.NonConfigurationInstances<\/code>\u5bf9\u8c61\u3002<\/li>\n
                                                                                8. \u6700\u540eComponentActivity<\/code>\u901a\u8fc7\u83b7\u53d6getLastNonConfigurationInstance().viewModelStore<\/code>\u5c5e\u6027\u7684\u503c\uff0c\u5373\u53ef\u62ff\u5230\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u524d<\/strong>\u7ef4\u62a4\u7684ViewModelStore<\/code>\uff0c\u5e76\u4e14\u83b7\u53d6\u5230\u7684ViewModelStore<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff08\u5373\u83b7\u53d6\u7684ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff09\u3002<\/li>\n<\/ol>\n
                                                                                    \u7b80\u5316\u6d41\u7a0b\uff1a<\/strong><\/p>\n
                                                                                    \n
                                                                                  1. \u914d\u7f6e\u53d8\u66f4\u91cd\u542f<\/strong>Activity<\/code>\uff0c\u4f1a\u8d70ActivityThread.handleRelaunchActivity()<\/code>\u65b9\u6cd5\uff0c\u5176\u5185\u90e8\u4f1a\u5148\u8d70\u9500\u6bc1<\/strong>\u6d41\u7a0b\uff08\u6807\u8bb0\u4f1a\u83b7\u53d6\u4e0b\u9762\u7684\u503c\uff09\uff0c\u540e\u8d70\u542f\u52a8<\/strong>\u6d41\u7a0b\u3002<\/li>\n
                                                                                  2. \u5728Activity<\/code>\u9500\u6bc1<\/strong>\u7684\u65f6\u5019\uff0cActivityClientRecord.lastNonConfigurationInstances.activity.viewModelStore<\/code>\u5c5e\u6027\uff0c\u4fdd\u5b58\u4e86\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u524d<\/strong>\u7ef4\u62a4\u7684ViewModelStore<\/code>\u3002<\/li>\n
                                                                                  3. \u5728Activity<\/code>\u542f\u52a8<\/strong>\u7684\u65f6\u5019\uff0cActivityClientRecord.lastNonConfigurationInstances<\/code>\u7684\u503c\u5728Activity.attach()<\/code>\u7684\u65f6\u5019\u88ab\u5b58\u5165\u5230\u4e86Activity<\/code>\u4e2d\uff0c\u6240\u4ee5\u540e\u7eed\u4e5f\u80fd\u83b7\u53d6\u5230\u5728\u914d\u7f6e\u53d8\u66f4\u4e4b\u524d<\/strong>\u7ef4\u62a4\u7684ViewModelStore<\/code>\uff0c\u5e76\u4e14\u83b7\u53d6\u5230\u7684ViewModelStore<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff08\u5373\u83b7\u53d6\u7684ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                                    Fragment<\/h3>\n
                                                                                    Fragment –> getViewModelStore\u65b9\u6cd5<\/strong><\/p>\n
                                                                                    @NonNull\n@Override\npublic ViewModelStore getViewModelStore() {\n    if (mFragmentManager == null) {\n        \/\/ \u4e0d\u80fd\u4ecedetached\u7684Fragment\u8bbf\u95eeViewModels\n        throw new IllegalStateException(\"Can't access ViewModels from detached fragment\");\n    }\n    if (getMinimumMaxLifecycleState() == Lifecycle.State.INITIALIZED.ordinal()) {\n        throw new IllegalStateException(\"Calling getViewModelStore() before a Fragment \"\n                + \"reaches onCreate() when using setMaxLifecycle(INITIALIZED) is not \"\n                + \"supported\");\n    }\n    return mFragmentManager.getViewModelStore(this);\n}\n<\/code><\/pre>\n
                                                                                    mFragmentManager<\/code>\u4e3aFragmentManager<\/code>\uff0c\u6211\u4eec\u6765\u770b\u4e0b\u5176getViewModelStore()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                                    FragmentManager –> getViewModelStore\u65b9\u6cd5<\/strong><\/p>\n
                                                                                    @NonNull\nViewModelStore getViewModelStore(@NonNull Fragment f) {\n    return mNonConfig.getViewModelStore(f);\n}\n<\/code><\/pre>\n
                                                                                    mNonConfig<\/code>\u4e3aFragmentManagerViewModel<\/code>\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b\u5b83\u662f\u5982\u4f55\u521b\u5efa\u7684\uff0c\u7136\u540e\u518d\u6765\u770b\u4e00\u4e0b\u5176getViewModelStore()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                                    \u901a\u8fc7\u67e5\u770b\uff0c\u53d1\u73b0\u5176\u5728FragmentManager.attachController()<\/code>\u65b9\u6cd5\u5185\u521b\u5efa\u3002<\/p>\n
                                                                                    FragmentManager –> attachController\u65b9\u6cd5<\/strong><\/p>\n
                                                                                    @SuppressWarnings(\"deprecation\")\n@SuppressLint(\"SyntheticAccessor\")\nvoid attachController(@NonNull FragmentHostCallback<?> host,\n                      @NonNull FragmentContainer container, @Nullable final Fragment parent) {\n    ...\n    \/\/ Get the FragmentManagerViewModel\n    if (parent != null) {\n        \/\/ \u5f53parent\u4e0d\u4e3anull\u65f6\uff0c\u8c03\u7528\u7236FragmentManager\u7684getChildNonConfig\u83b7\u53d6\u3002\n        mNonConfig = parent.mFragmentManager.getChildNonConfig(parent);\n    } else if (host instanceof ViewModelStoreOwner) {\n        \/\/ \u4ecehost\u4e2d\u83b7\u53d6ViewModelStore\uff0c\u7136\u540e\u4f7f\u7528FragmentManagerViewModel\u8fdb\u884c\u83b7\u53d6\u3002\n        ViewModelStore viewModelStore = ((ViewModelStoreOwner) host).getViewModelStore();\n        mNonConfig = FragmentManagerViewModel.getInstance(viewModelStore);\n    } else {\n        mNonConfig = new FragmentManagerViewModel(false);\n    }\n    ...\n}\n<\/code><\/pre>\n
                                                                                    \u901a\u8fc7\u67e5\u770b\u8c03\u7528\u6808\uff0c\u53d1\u73b0attachController()<\/code>\u65b9\u6cd5\u4f1a\u5728Activity<\/code>\u7684onCreate()<\/code>\u3001Fragment<\/code>\u7684performAttach()<\/code>\u7684\u65f6\u5019\u8c03\u7528\uff0c\u5176\u4e2dhost<\/code>\u4e3aFragmentActivity<\/code>\u7684\u5185\u90e8\u7c7b<\/strong>FragmentActivity.HostCallbacks<\/code>\uff08\u6301\u6709\u5916\u90e8\u7c7bFragmentActivity<\/code>\uff0c\u53ef\u4ee5\u8c03\u7528\u5176\u65b9\u6cd5\uff09\uff0c\u5b83\u5b9e\u73b0\u4e86ViewModelStoreOwner<\/code>\u63a5\u53e3\u3002<\/p>\n
                                                                                    \u521b\u5efamNonConfig<\/code>\uff0c\u5982\u679c\u662fActivity<\/code>\u7684FragmentManager<\/code>\uff0c\u5176\u4f1a\u8d70\u7b2c\u4e8c\u4e2aif<\/code>\u521b\u5efa\uff1b\u5982\u679c\u662fFragment<\/code>\u7684FragmentManager<\/code>\uff0c\u5176\u4f1a\u8d70\u7b2c\u4e00\u4e2aif<\/code>\u521b\u5efa\u3002<\/p>\n
                                                                                    \u6211\u4eec\u4ee5Activity<\/code>\u7684\u4e3a\u4f8b\uff0c\u5148\u6765\u770b\u4e00\u4e0bFragmentActivity.HostCallbacks<\/code>\u7684getViewModelStore()<\/code>\u65b9\u6cd5\uff0c\u7136\u540e\u518d\u6765\u770b\u4e00\u4e0bFragmentManagerViewModel<\/code>\u7684getInstance()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                                    FragmentActivity.HostCallbacks –> getViewModelStore\u65b9\u6cd5<\/strong><\/p>\n
                                                                                    class HostCallbacks extends FragmentHostCallback<FragmentActivity> implements\n        OnConfigurationChangedProvider,\n        OnTrimMemoryProvider,\n        OnMultiWindowModeChangedProvider,\n        OnPictureInPictureModeChangedProvider,\n        ViewModelStoreOwner,\n        OnBackPressedDispatcherOwner,\n        ActivityResultRegistryOwner,\n        SavedStateRegistryOwner,\n        FragmentOnAttachListener,\n        MenuHost {\n        ...\n\n        @NonNull\n        @Override\n        public ViewModelStore getViewModelStore() {\n            return FragmentActivity.this.getViewModelStore();\n        }\n        ...\n}\n<\/code><\/pre>\n
                                                                                    FragmentActivity.HostCallbacks<\/code>\u7c7b\uff0c\u5b9e\u73b0\u4e86ViewModelStoreOwner<\/code>\u63a5\u53e3\uff0c\u5176getViewModelStore()<\/code>\u65b9\u6cd5\uff0c\u76f4\u63a5\u8c03\u7528\u4e86\u5916\u90e8\u7c7b<\/strong>FragmentActivity<\/code>\u7684getViewModelStore()<\/code>\u65b9\u6cd5\uff0c\u6240\u4ee5\u80fd\u83b7\u53d6\u5230ViewModelStore<\/code>\u3002<\/p>\n
                                                                                    \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0bFragmentManagerViewModel<\/code>\u7684getInstance()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                                    FragmentManagerViewModel –> getInstance\u65b9\u6cd5<\/strong><\/p>\n
                                                                                    final class FragmentManagerViewModel extends ViewModel {\n    private static final String TAG = FragmentManager.TAG;\n\n    private static final ViewModelProvider.Factory FACTORY = new ViewModelProvider.Factory() {\n        @NonNull\n        @Override\n        @SuppressWarnings(\"unchecked\")\n        public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {\n            FragmentManagerViewModel viewModel = new FragmentManagerViewModel(true);\n            return (T) viewModel;\n        }\n    };\n\n    @NonNull\n    static FragmentManagerViewModel getInstance(ViewModelStore viewModelStore) {\n        ViewModelProvider viewModelProvider = new ViewModelProvider(viewModelStore,\n                FACTORY);\n        return viewModelProvider.get(FragmentManagerViewModel.class);\n    }\n\n}\n<\/code><\/pre>\n
                                                                                    FragmentManagerViewModel<\/code>\u662f\u4e00\u4e2aViewModel<\/code>\uff0cgetInstance(ViewModelStore)<\/code>\u65b9\u6cd5\u4f1a\u5148\u4ece<\/strong>\u4f20\u5165\u7684ViewModelStore<\/code>\uff08\u5373ComponentActivity<\/code>\u7684ViewModelStore<\/code>\uff09\u4e2d\u83b7\u53d6\uff0c\u5982\u679c\u6ca1\u6709\u5219\u518d\u4f7f\u7528<\/strong>FACTORY<\/code>\u8fdb\u884c\u521b\u5efaFragmentManagerViewModel<\/code>\u3002<\/p>\n
                                                                                    \n  \u8bf4\u660e\uff1a
                                                                                    \n  1. \u4f20\u5165\u7684ViewModelStore<\/code>\u4e3aComponentActivity<\/code>\u7684ViewModelStore<\/code>\uff0c\u4e00\u5f00\u59cbViewModelStore<\/code>\u5185\u662f\u6ca1\u6709FragmentManagerViewModel<\/code>\u7684\uff0c\u6240\u4ee5\u521b\u5efaFragmentManagerViewModel<\/code>\u5e76\u5b58\u5165\u5176ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\u3002
                                                                                    \n  2. \u7531\u4e8eComponentActivity<\/code>\u7684ViewModelStore<\/code>\u914d\u7f6e\u53d8\u66f4\u540e<\/strong>\u5b9e\u4f8b\u4e0d\u53d8\uff0c\u6240\u4ee5FragmentManagerViewModel.getInstance()<\/code>\u65b9\u6cd5\u4e5f\u80fd\u4eceComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\u83b7\u53d6\u5230\u914d\u7f6e\u53d8\u66f4\u524d<\/strong>\u5b58\u5165\u7684FragmentManagerViewModel<\/code>\u5b9e\u4f8b<\/strong>\u3002\n<\/p><\/blockquote>\n
                                                                                    \u8bf4\u5b8c\u4e86FragmentManagerViewModel<\/code>\u7684\u521b\u5efa\uff0c\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\u5176getViewModelStore()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                                    FragmentManagerViewModel –> getViewModelStore\u65b9\u6cd5<\/strong><\/p>\n
                                                                                    @NonNull\nViewModelStore getViewModelStore(@NonNull Fragment f) {\n    ViewModelStore viewModelStore = mViewModelStores.get(f.mWho);\n    if (viewModelStore == null) {\n        viewModelStore = new ViewModelStore();\n        mViewModelStores.put(f.mWho, viewModelStore);\n    }\n    return viewModelStore;\n}\n<\/code><\/pre>\n
                                                                                    getViewModelStore(Fragment)<\/code>\u65b9\u6cd5\uff0c\u83b7\u53d6\u5230\u6307\u5b9aFragment<\/code>\u7684ViewModelStore<\/code>\uff0c\u5982\u679cmViewModelStores<\/code>\u4e2d\u6709\u5219\u8fd4\u56de\uff0c\u5982\u679c\u6ca1\u6709\u5219\u8fdb\u884c\u521b\u5efa<\/strong>\u5e76\u4fdd\u5b58<\/strong>\u5230mViewModelStores<\/code>\u4e2d\uff0cmViewModelStores<\/code>\u4e3aViewModelStore<\/code>\u7684Map<\/code>\u96c6\u5408\u3002<\/p>\n
                                                                                    \n  \u8bf4\u660e\uff1a
                                                                                    \n  1. \u4e3a\u4ec0\u4e48FragmentManagerViewModel.getViewModelStore(Fragment)<\/code>\u65b9\u6cd5\uff0c\u8981\u4f20\u5165Fragment<\/code>\u624d\u80fd\u83b7\u53d6\u5230ViewModelStore<\/code>\uff1f
                                                                                    \n  * \u56e0\u4e3aFragmentManagerViewModel<\/code>\uff0c\u4fdd\u5b58\u5230\u4e86ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\uff0c\u5bfc\u81f4\u6bcf\u4e2aFragment<\/code>\u83b7\u53d6\u5230\u7684FragmentManagerViewModel<\/code>\u5b9e\u4f8b\u76f8\u540c<\/strong>\uff0c\u6240\u4ee5\u9700\u8981\u4f20\u5165Fragment<\/code>\u5b9e\u4f8b\u533a\u5206\u662f\u83b7\u53d6\u54ea\u4e2aViewModelStore<\/code>\u3002
                                                                                    \n  2. \u4e3a\u4ec0\u4e48Fragment<\/code>\u5728\u914d\u7f6e\u53d8\u66f4\u524d\u540e<\/strong>\u83b7\u53d6\u5230\u7684ViewModelStore<\/code>\u3001ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff1f
                                                                                    \n  * \u56e0\u4e3aComponentActivity<\/code>\u5728\u914d\u7f6e\u53d8\u66f4\u524d\u540e<\/strong>\u83b7\u53d6\u5230\u7684ViewModelStore<\/code>\u3001ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff0c\u56e0\u6b64\u5b58\u5728ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\u7684FragmentManagerViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff0c\u6240\u4ee5\u5b58\u5728mViewModelStores<\/code>\u7684\u5404\u4e2aFragment<\/code>\u7684ViewModelStore<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff08\u5373\u83b7\u53d6\u7684ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff09\u3002\n<\/p><\/blockquote>\n
                                                                                    \u5c0f\u7ed3<\/h4>\n
                                                                                    \n  \u914d\u7f6e\u53d8\u66f4\u91cd\u542fFragment-ViewModel\u4fdd\u6301\u4e0d\u53d8\u7684\u4ee3\u7801\u6d41\u7a0b\uff1a<\/strong><\/p>\n
                                                                                      \n
                                                                                    1. \u5728Fragment.getViewModelStore()<\/code>\u65b9\u6cd5\uff0c\u4f1a\u901a\u8fc7FragmentManager.getViewModelStore(Fragment)<\/code>\u83b7\u53d6\u3002<\/li>\n
                                                                                    2. \u800cFragmentManager.getViewModelStore(Fragment)<\/code>\u65b9\u6cd5\uff0c\u4f1a\u901a\u8fc7mNonConfig.getViewModelStore(Fragment)<\/code>\u83b7\u53d6\u3002<\/li>\n
                                                                                    3. \u800cFragmentManager.mNonConfig<\/code>\u5c5e\u6027\uff0c\u662fFragmentManagerViewModel<\/code>\u7c7b\uff0c\u662f\u4e00\u4e2aViewModel<\/code>\uff0c\u5176\u662f\u5728FragmentManager.attachController()<\/code>\u65b9\u6cd5\u5185\u521b\u5efa<\/strong>\u7684\u3002<\/li>\n
                                                                                    4. \u6211\u4eec\u5148\u8bb2FragmentManagerViewModel<\/code>\u7684\u521b\u5efa<\/strong>\uff0c\u7136\u540e\u8bb2FragmentManagerViewModel<\/code>\u7684\u83b7\u53d6<\/strong>ViewModelStore<\/code>\u3002<\/li>\n
                                                                                    5. FragmentManagerViewModel<\/code>\u7684\u521b\u5efa<\/strong>\uff1a\n
                                                                                        \n
                                                                                      1. \u5982\u679c\u662fComponentActivity<\/code>\u7684FragmentManager<\/code>\u521b\u5efamNonConfig<\/code>\uff0c\u5219\u662f\u901a\u8fc7FragmentManagerViewModel.getInstance(viewModelStore)<\/code>\u65b9\u6cd5\u521b\u5efa<\/strong>\uff0c\u53c2\u6570viewModelStore<\/code>\u4e3a\u83b7\u53d6\u7684\u5f53\u524d<\/strong>Activity<\/code>\u5185ViewModelStore<\/code>\u3002\uff08\u5982\u679c\u662fFragment<\/code>\u7684FragmentManager<\/code>\u521b\u5efamNonConfig<\/code>\uff0c\u8fd9\u91cc\u6ca1\u505a\u8bb2\u89e3\uff09<\/li>\n
                                                                                      2. FragmentManagerViewModel.getInstance(viewModelStore)<\/code>\u65b9\u6cd5\uff0c\u5185\u90e8\u662f\u4f7f\u7528ViewModelProvider<\/code>\u7684get()<\/code>\u65b9\u6cd5\u83b7\u53d6\u7684\u3002\u65e2\u4f1a\u5148\u4ece\u53c2\u6570viewModelStore<\/code>\u4e2d\u83b7\u53d6\u6b64FragmentManagerViewModel<\/code>\uff0c\u5982\u679c\u6709\u5219\u8fd4\u56de\uff0c\u5982\u679c\u6ca1\u6709\u5219\u518d\u8fdb\u884c\u521b\u5efa\u5e76\u6dfb\u52a0\u5230\u6b64<\/strong>viewModelStore<\/code>\u4e2d\uff08\u5373\u5c06\u521b\u5efa<\/strong>\u7684FragmentManagerViewModel<\/code>\u5b58\u5230\u5f53\u524d<\/strong>Activity<\/code>\u5185ViewModelStore<\/code>\u4e2d\uff0c\u4fdd\u8bc1\u4e86\u4e00\u4e2a<\/strong>Activity<\/code>\u5185\u4ec5\u6709\u4e00\u4e2a<\/strong>FragmentManagerViewModel<\/code>\uff09\u3002<\/li>\n<\/ol>\n<\/li>\n
                                                                                      3. FragmentManagerViewModel<\/code>\u7684\u83b7\u53d6<\/strong>ViewModelStore<\/code>\uff1a\n
                                                                                          \n
                                                                                        1. FragmentManagerViewModel.getViewModelStore(Fragment)<\/code>\u65b9\u6cd5\uff0c\u83b7\u53d6\u5230\u6307\u5b9aFragment<\/code>\u7684ViewModelStore<\/code>\uff0c\u5982\u679cmViewModelStores<\/code>\u4e2d\u6709\u5219\u8fd4\u56de\uff0c\u5982\u679c\u6ca1\u6709\u5219\u8fdb\u884c\u521b\u5efa<\/strong>\u5e76\u4fdd\u5b58<\/strong>\u5230mViewModelStores<\/code>\u4e2d\u3002<\/li>\n
                                                                                        2. FragmentManagerViewModel.mViewModelStores<\/code>\u5c5e\u6027\uff0c\u4e3aViewModelStore<\/code>\u7684Map<\/code>\u96c6\u5408\uff0ckey<\/code>\u4e3aString<\/code>\uff0cvalue<\/code>\u4e3aViewModelStore<\/code>\uff0c\u7528\u4e8e\u8bb0\u5f55\u4e00\u4e2aFragment<\/code>\u5bf9\u5e94\u4e00\u4e2aViewModelStore<\/code>\u3002<\/li>\n
                                                                                        3. \u8bf4\u660e\uff1a\n
                                                                                            \n
                                                                                          1. ComponentActivity<\/code>\u5185\u81ea\u5df1\u7ef4\u62a4<\/strong>\u4e86\u4e00\u4e2aViewModelStore<\/code>\u3002<\/li>\n
                                                                                          2. Fragment<\/code>\u5185\u6ca1\u6709\u7ef4\u62a4<\/strong>\u4e86\u4e00\u4e2aViewModelStore<\/code>\uff0c\u800c\u662f\u901a\u8fc7\u83b7\u53d6ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u5185\u7684FragmentManagerViewModel<\/code>\uff08\u6ca1\u6709\u5219\u4f1a\u521b\u5efa\u5e76\u6dfb\u52a0\uff09\uff0c\u901a\u8fc7\u5176\u7ef4\u62a4\u7684mViewModelStores<\/code>\u83b7\u53d6\u5f53\u524dFragment<\/code>\u5bf9\u5e94\u7684ViewModelStore<\/code>\uff08\u6ca1\u6709\u5219\u4f1a\u521b\u5efa\u5e76\u6dfb\u52a0\uff09\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/li>\n
                                                                                          3. \u56e0\u4e3aComponentActivity<\/code>\u5728\u914d\u7f6e\u53d8\u66f4\u524d\u540e<\/strong>\u83b7\u53d6\u5230\u7684ViewModelStore<\/code>\u3001ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff0c\u56e0\u6b64\u5b58\u5728ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\u7684FragmentManagerViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff0c\u6240\u4ee5\u5b58\u5728mViewModelStores<\/code>\u7684\u5404\u4e2aFragment<\/code>\u7684ViewModelStore<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff08\u5373\u4eceFragment<\/code>\u4e2d\u83b7\u53d6\u7684ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff09\u3002<\/li>\n<\/ol>\n
                                                                                              \u7b80\u5316\u6d41\u7a0b\uff1a<\/strong><\/p>\n
                                                                                              \n
                                                                                            1. Fragment<\/code>\u83b7\u53d6ViewModelStore<\/code>\uff0c\u662f\u901a\u8fc7FragmentManagerViewModel<\/code>\u83b7\u53d6\u7684\uff0c\u5176\u5b58\u653e\u5728\u5f53\u524dComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\uff08\u6ca1\u6709\u5219\u4f1a\u521b\u5efa\u5e76\u6dfb\u52a0\uff09\u3002<\/li>\n
                                                                                            2. FragmentManagerViewModel.getViewModelStore(Fragment)<\/code>\u65b9\u6cd5\uff0c\u83b7\u53d6\u5230\u6307\u5b9aFragment<\/code>\u7684ViewModelStore<\/code>\uff0c\u6ca1\u6709\u5219\u4f1a\u521b\u5efa\u5e76\u6dfb\u52a0\u5230mViewModelStores<\/code>\u4e2d\u3002mViewModelStores<\/code>\u4e3aViewModelStore<\/code>\u7684Map<\/code>\u96c6\u5408\uff0c\u7528\u4e8e\u8bb0\u5f55\u4e00\u4e2aFragment<\/code>\u5bf9\u5e94\u4e00\u4e2aViewModelStore<\/code>\u3002<\/li>\n
                                                                                            3. \u56e0\u4e3aComponentActivity<\/code>\u5728\u914d\u7f6e\u53d8\u66f4\u524d\u540e<\/strong>\u83b7\u53d6\u5230\u7684ViewModelStore<\/code>\u3001ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff0c\u56e0\u6b64\u5b58\u5728ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\u7684FragmentManagerViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff0c\u6240\u4ee5\u5b58\u5728mViewModelStores<\/code>\u7684\u5404\u4e2aFragment<\/code>\u7684ViewModelStore<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff08\u5373\u4eceFragment<\/code>\u4e2d\u83b7\u53d6\u7684ViewModel<\/code>\u5b9e\u4f8b\u4e0d\u53d8<\/strong>\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                                              ViewModel\u662f\u5982\u4f55\u88ab\u6e05\u9664\u7684\uff1f<\/h2>\n
                                                                                              \u8981\u60f3\u5206\u6790ViewModel<\/code>\u662f\u5982\u4f55\u88ab\u6e05\u9664\u7684\uff0c\u5219\u9700\u8981\u5206\u6790ViewModelStore<\/code>\u662f\u5982\u4f55\u88ab\u6e05\u9664\u7684\u3002<\/p>\n
                                                                                              Activity<\/h3>\n
                                                                                              \u901a\u8fc7\u67e5\u627e\uff0c\u6211\u4eec\u53d1\u73b0\u5728ComponentActivity<\/code>\u7684init<\/code>\u65b9\u6cd5\u91cc\u9762\u8c03\u7528\u4e86ViewModelStore<\/code>\u7684clear()<\/code>\u6e05\u9664<\/strong>\u64cd\u4f5c\u3002<\/p>\n
                                                                                              ComponentActivity\u7c7b<\/strong><\/p>\n
                                                                                              open class ComponentActivity() :\n    androidx.core.app.ComponentActivity(),\n    ContextAware,\n    LifecycleOwner,\n    ViewModelStoreOwner,\n    HasDefaultViewModelProviderFactory,\n    SavedStateRegistryOwner,\n    OnBackPressedDispatcherOwner,\n    ActivityResultRegistryOwner,\n    ActivityResultCaller,\n    OnConfigurationChangedProvider,\n    OnTrimMemoryProvider,\n    OnNewIntentProvider,\n    OnMultiWindowModeChangedProvider,\n    OnPictureInPictureModeChangedProvider,\n    OnUserLeaveHintProvider,\n    MenuHost,\n    FullyDrawnReporterOwner {\n\n    init {\n        ...\n\n        @Suppress(\"LeakingThis\")\n        lifecycle.addObserver(\n            LifecycleEventObserver { _, event ->\n                if (event == Lifecycle.Event.ON_DESTROY) {\n                    \/\/ Clear out the available context\n                    contextAwareHelper.clearAvailableContext()\n                    \/\/ And clear the ViewModelStore\n                    if (!isChangingConfigurations) {\n                        \/\/ \u4e0d\u662f\u914d\u7f6e\u53d8\u66f4\uff0c\u6e05\u9664\u5168\u90e8ViewModel\u3002\n                        viewModelStore.clear()\n                    }\n                    reportFullyDrawnExecutor.activityDestroyed()\n                }\n            }\n        )\n\n        ...\n    }\n}\n<\/code><\/pre>\n
                                                                                              \u4f7f\u7528Lifecycle<\/code>\u89c2\u5bdf\u5f53\u524d\u751f\u547d\u5468\u671f\u7684\u72b6\u6001<\/strong>\uff0c\u5982\u679c\u4e8b\u4ef6\u5904\u4e8eON_DESTROY<\/code>\u5e76\u4e14\u4e0d\u662f\u914d\u7f6e\u53d8\u66f4<\/strong>\uff0c\u5219\u6e05\u7a7a\u5168\u90e8<\/strong>ViewModel<\/code>\u3002<\/p>\n
                                                                                              \n  \u8bf4\u660e\uff1a
                                                                                              \n  1. Activity<\/code>\u7684ViewModel<\/code>\u662f\u5982\u4f55\u88ab\u6e05\u9664\u7684\uff1f<\/p>\n
                                                                                                \n
                                                                                              • Activity<\/code>\u521d\u59cb\u5316<\/strong>\u7684\u65f6\u5019\uff0c\u4f7f\u7528Lifecycle<\/code>\u89c2\u5bdf\u5f53\u524d\u751f\u547d\u5468\u671f\u7684\u72b6\u6001<\/strong>\uff0c\u5982\u679c\u4e8b\u4ef6\u5904\u4e8eON_DESTROY<\/code>\u5e76\u4e14\u4e0d\u662f\u914d\u7f6e\u53d8\u66f4<\/strong>\uff0c\u5219\u6e05\u7a7a\u5168\u90e8<\/strong>ViewModel<\/code>\u3002<\/li>\n<\/ul>\n<\/blockquote>\n
                                                                                                Fragment<\/h3>\n
                                                                                                \u901a\u8fc7\u8c03\u7528\u67e5\u627e\uff0c\u6211\u4eec\u53d1\u73b0\u5728FragmentManagerViewModel<\/code>\u7684clearNonConfigStateInternal()<\/code>\u65b9\u6cd5\u91cc\u9762\u8c03\u7528\u4e86ViewModelStore<\/code>\u7684clear()<\/code>\u6e05\u9664<\/strong>\u64cd\u4f5c\u3002<\/p>\n
                                                                                                FragmentManagerViewModel –> clearNonConfigStateInternal\u65b9\u6cd5<\/strong><\/p>\n
                                                                                                void clearNonConfigState(@NonNull Fragment f, boolean destroyChildNonConfig) {\n    if (FragmentManager.isLoggingEnabled(Log.DEBUG)) {\n        Log.d(TAG, \"Clearing non-config state for \" + f);\n    }\n    clearNonConfigStateInternal(f.mWho, destroyChildNonConfig);\n}\n\nprivate void clearNonConfigStateInternal(@NonNull String who, boolean destroyChildNonConfig) {\n    \/\/ Clear and remove the Fragment's child non config state\n    FragmentManagerViewModel childNonConfig = mChildNonConfigs.get(who);\n    if (childNonConfig != null) {\n        \/\/ destroy child nonConfig immediately if it hasn't gone through init\n        if (destroyChildNonConfig) {\n            ArrayList<String> clearList = new ArrayList<>();\n            clearList.addAll(childNonConfig.mChildNonConfigs.keySet());\n            for (String childWho : clearList) {\n                childNonConfig.clearNonConfigState(childWho, true);\n            }\n        }\n        childNonConfig.onCleared();\n        mChildNonConfigs.remove(who);\n    }\n    \/\/ \u83b7\u53d6\u5230\u5bf9\u5e94Fragment\u7684ViewModelStore\n    ViewModelStore viewModelStore = mViewModelStores.get(who);\n    if (viewModelStore != null) {\n        \/\/ \u6e05\u9664\u5168\u90e8ViewModel\u3002\n        viewModelStore.clear();\n        mViewModelStores.remove(who);\n    }\n}\n<\/code><\/pre>\n
                                                                                                clearNonConfigStateInternal(String)<\/code>\u65b9\u6cd5\uff0c\u4f1a\u83b7\u53d6\u5230\u5bf9\u5e94Fragment<\/code>\u7684ViewModelStore<\/code>\uff0c\u7136\u540e\u8c03\u7528\u5176clear()<\/code>\u65b9\u6cd5\u6e05\u9664\u5168\u90e8<\/strong>ViewModel<\/code>\u3002<\/p>\n
                                                                                                \u901a\u8fc7\u8c03\u7528\u67e5\u627e\uff0c\u6211\u4eec\u53d1\u73b0\u5728clearNonConfigStateInternal(String)<\/code>\u65b9\u6cd5\u88abclearNonConfigState()<\/code>\u65b9\u6cd5\u8c03\u7528\uff0c\u6700\u540e\u901a\u8fc7Debug<\/code>\u67e5\u770b\u8c03\u7528\u6808<\/strong>\u53d1\u73b0FragmentStateManager.destroy()<\/code>\u65b9\u6cd5\uff0c\u6267\u884c\u4e86clearNonConfigState(Fragment)<\/code>\u65b9\u6cd5\u3002<\/p>\n
                                                                                                FragmentStateManager –> destroy\u65b9\u6cd5<\/strong><\/p>\n
                                                                                                void destroy() {\n    ...\n    if (shouldDestroy) {       \n        FragmentHostCallback<?> host = mFragment.mHost;\n        boolean shouldClear;\n        if (host instanceof ViewModelStoreOwner) {\n            shouldClear = mFragmentStore.getNonConfig().isCleared();\n        } else if (host.getContext() instanceof Activity) {\n            Activity activity = (Activity) host.getContext();\n            shouldClear = !activity.isChangingConfigurations();\n        } else {\n            shouldClear = true;\n        }\n        if ((beingRemoved && !mFragment.mBeingSaved) || shouldClear) {\n            \/\/ \u6267\u884cFragmentManagerViewModel\u7684clearNonConfigState()\uff0c\u6e05\u9664\u4e0d\u4f1a\u56e0\u914d\u7f6e\u53d8\u66f4\u800c\u6539\u53d8\u7684\u72b6\u6001\u3002\n            mFragmentStore.getNonConfig().clearNonConfigState(mFragment, false);\n        }\n\n        ...\n    }\n    ...\n}\n<\/code><\/pre>\n
                                                                                                host<\/code>\u4e3aFragmentActivity.HostCallbacks<\/code>\uff0c\u5b83\u5b9e\u73b0\u4e86ViewModelStoreOwner<\/code>\u63a5\u53e3\uff0c\u6240\u4ee5\u4f1a\u8d70\u7b2c\u4e00\u4e2aif<\/code>\u3002\u53ea\u8981shouldClear<\/code>\u4e3atrue<\/code>\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u6267\u884c\u5230FragmentManagerViewModel<\/code>\u7684clearNonConfigState(Fragment)<\/code>\u65b9\u6cd5\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0bFragmentManagerViewModel<\/code>\u7684isCleared()<\/code>\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u662f\u4ec0\u4e48\uff1f<\/p>\n
                                                                                                FragmentManagerViewModel –> isCleared\u65b9\u6cd5<\/strong><\/p>\n
                                                                                                final class FragmentManagerViewModel extends ViewModel {\n\n    @Override\n    protected void onCleared() {\n        if (FragmentManager.isLoggingEnabled(Log.DEBUG)) {\n            Log.d(TAG, \"onCleared called for \" + this);\n        }\n        \/\/ \u6807\u8bb0\u5df2\u7ecf\u88ab\u6e05\u7406\n        mHasBeenCleared = true;\n    }\n\n    boolean isCleared() {\n        return mHasBeenCleared;\n    }\n}\n<\/code><\/pre>\n
                                                                                                FragmentManagerViewModel<\/code>\u662f\u4e00\u4e2aViewModel<\/code>\uff0c\u88ab\u6dfb\u52a0\u5230\u4e86ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\uff0c\u5f53ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u88ab\u6e05\u9664\u7684\u65f6\u5019\uff08\u4e8b\u4ef6\u4e3aON_DESTROY<\/code>\u5e76\u4e14\u4e0d\u662f\u914d\u7f6e\u53d8\u66f4<\/strong>\uff09\uff0c\u4f1a\u8c03\u7528ViewModel<\/code>\u7684onCleared()<\/code>\u65b9\u6cd5\uff0c\u5219mHasBeenCleared<\/code>\u4e3atrue<\/code>\uff0c\u5373isCleared()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e3atrue<\/code>\u3002<\/p>\n
                                                                                                \u56e0\u4e3aisCleared()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e3atrue<\/code>\uff0c\u6240\u4ee5FragmentStateManager.destroy()<\/code>\u65b9\u6cd5\u5185\u4f1a\u6267\u884c\u5230FragmentManagerViewModel<\/code>\u7684clearNonConfigState()<\/code>\u65b9\u6cd5\uff0c\u4f1a\u83b7\u53d6\u5230\u5bf9\u5e94Fragment<\/code>\u7684ViewModelStore<\/code>\uff0c\u7136\u540e\u8c03\u7528\u5176clear()<\/code>\u65b9\u6cd5\u6e05\u9664\u5168\u90e8<\/strong>ViewModel<\/code>\u3002<\/p>\n
                                                                                                \n  \u8bf4\u660e\uff1a
                                                                                                \n  1. Fragment<\/code>\u7684ViewModel<\/code>\u662f\u5982\u4f55\u88ab\u6e05\u9664\u7684\uff1f
                                                                                                \n  * FragmentManagerViewModel<\/code>\u662f\u4e00\u4e2aViewModel<\/code>\uff0c\u88ab\u6dfb\u52a0\u5230\u4e86ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\uff0c\u5f53ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u88ab\u6e05\u9664\u7684\u65f6\u5019\uff08\u4e8b\u4ef6\u4e3aON_DESTROY<\/code>\u5e76\u4e14\u4e0d\u662f\u914d\u7f6e\u53d8\u66f4<\/strong>\uff09\uff0c\u4f1a\u8c03\u7528ViewModel<\/code>\u7684onCleared()<\/code>\u65b9\u6cd5\uff0c\u5219mHasBeenCleared<\/code>\u4e3atrue<\/code>\uff0c\u5373isCleared()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e3atrue<\/code>\uff0c\u6240\u4ee5FragmentStateManager.destroy()<\/code>\u65b9\u6cd5\u5185\u4f1a\u6267\u884c\u5230FragmentManagerViewModel<\/code>\u7684clearNonConfigState(Fragment)<\/code>\u65b9\u6cd5\uff0c\u4f1a\u83b7\u53d6\u5230\u5bf9\u5e94Fragment<\/code>\u7684ViewModelStore<\/code>\uff0c\u7136\u540e\u8c03\u7528\u5176clear()<\/code>\u65b9\u6cd5\u6e05\u9664\u5168\u90e8<\/strong>ViewModel<\/code>\u3002\n<\/p><\/blockquote>\n
                                                                                                \u5c0f\u7ed3<\/h3>\n
                                                                                                \n  ViewModel\u662f\u5982\u4f55\u88ab\u6e05\u9664\u7684\uff1f<\/p>\n
                                                                                                  \n
                                                                                                1. Activity<\/code>\uff1aActivity<\/code>\u521d\u59cb\u5316<\/strong>\u7684\u65f6\u5019\uff0c\u4f7f\u7528Lifecycle<\/code>\u89c2\u5bdf\u5f53\u524d\u751f\u547d\u5468\u671f\u7684\u72b6\u6001<\/strong>\uff0c\u5982\u679c\u4e8b\u4ef6\u5904\u4e8eON_DESTROY<\/code>\u5e76\u4e14\u4e0d\u662f\u914d\u7f6e\u53d8\u66f4<\/strong>\uff0c\u5219\u6e05\u7a7a\u5168\u90e8<\/strong>ViewModel<\/code>\u3002<\/li>\n
                                                                                                2. Fragment<\/code>\uff1aFragmentManagerViewModel<\/code>\u662f\u4e00\u4e2aViewModel<\/code>\uff0c\u88ab\u6dfb\u52a0\u5230\u4e86ComponentActivity<\/code>\u7684ViewModelStore<\/code>\u4e2d\uff0c\u5f53Fragment<\/code>\u9500\u6bc1<\/strong>\u7684\u65f6\u5019\uff0c\u4f1a\u5224\u65ad\u6b64ViewModel<\/code>\u662f\u5426\u88ab\u6d88\u9664<\/strong>\uff0c\u5982\u679c\u88ab\u6d88\u9664<\/strong>\uff08\u65e2ComponentActivity<\/code>\u88ab\u9500\u6bc1<\/strong>\u5e76\u4e14\u4e0d\u662f\u914d\u7f6e\u53d8\u66f4<\/strong>\uff09\uff0c\u5219\u4f1a\u83b7\u53d6\u5230\u6b64<\/strong>Fragment<\/code>\u7684ViewModelStore<\/code>\uff0c\u7136\u540e\u8c03\u7528\u5176clear()<\/code>\u65b9\u6cd5\u6e05\u9664\u5168\u90e8<\/strong>ViewModel<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
                                                                                                  \u603b\u7ed3<\/h1>\n
                                                                                                  \u4ee5\u4e0a\u5c31\u662f\u5168\u9762\u7684Jetpack-ViewModel<\/code>\u6e90\u7801\u4e86\uff01\u6b22\u8fce\u5927\u5bb6\u70b9\u8d5e\u3001\u6536\u85cf<\/strong>\uff0c\u4ee5\u65b9\u4fbf\u60a8\u540e\u7eed\u67e5\u770b\uff0c\u4e4b\u540e\u4f1a\u51faJetpack<\/code>\u5176\u5b83\u6e90\u7801\u7cfb\u5217\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                                                                                                  ViewModel\u6e90\u7801\u89e3\u6790 \u6e90\u7801\u7248\u672c\uff1a * ViewModel\uff1a2.8.7 * androidx.activi […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[18,10],"tags":[22,27,20],"class_list":["post-105","post","type-post","status-publish","format-standard","hentry","category-source-jetpack","category-source","tag-jetpack","tag-viewmodel","tag-20"],"modified_by":"admin","jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=105"}],"version-history":[{"count":7,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/105\/revisions"}],"predecessor-version":[{"id":243,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/105\/revisions\/243"}],"wp:attachment":[{"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=105"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}