{"id":95,"date":"2021-12-13T07:03:13","date_gmt":"2021-12-13T07:03:13","guid":{"rendered":"http:\/\/www.devblog.cn\/?p=95"},"modified":"2025-03-11T15:04:56","modified_gmt":"2025-03-11T07:04:56","slug":"95","status":"publish","type":"post","link":"http:\/\/www.devblog.cn\/?p=95","title":{"rendered":"Jetpack-Lifecycle\u6e90\u7801\u89e3\u6790"},"content":{"rendered":"

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

\n \u6e90\u7801\u7248\u672c\uff1a
\n * Lifecycle<\/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<\/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 * Jetpack-Startup\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\u660eLifecycleObserver<\/h2>\n

1. DefaultLifecycleObserver<\/h3>\n

\u751f\u547d\u5468\u671f\u72b6\u6001\u6539\u53d8\u65f6\uff0c\u4f1a\u8c03\u7528\u5bf9\u5e94\u7684<\/strong>\u65b9\u6cd5\u3002\u53ef\u6839\u636e\u9700\u8981\uff0c\u91cd\u5199\u67d0\u4e2a\u65b9\u6cd5\u3002<\/p>\n

val lifecycleObserver = object : DefaultLifecycleObserver {\n\n    override fun onResume(owner: LifecycleOwner) {\n        super.onResume(owner)\n    }\n\n    override fun onPause(owner: LifecycleOwner) {\n        super.onPause(owner)\n    }\n}\n<\/code><\/pre>\n
2. LifecycleEventObserver<\/h3>\n
\u751f\u547d\u5468\u671f\u72b6\u6001\u6539\u53d8\u65f6\uff0c\u4f1a\u8c03\u7528onStateChanged<\/code>\u65b9\u6cd5\u3002<\/p>\n
val lifecycleObserver = object : LifecycleEventObserver {\n\n    override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) {\n\n    }\n}\n<\/code><\/pre>\n
3. OnLifecycleEvent\uff08\u5df2\u5f03\u7528\uff09<\/h3>\n
\u751f\u547d\u5468\u671f\u72b6\u6001\u6539\u53d8\u65f6\uff0c\u4f1a\u8c03\u7528LifecycleObserver<\/code>\u5b50\u7c7b\u88ab\u5bf9\u5e94event\u6807\u6ce8\u7684<\/strong>\u65b9\u6cd5\u3002\u4f7f\u7528OnLifecycleEvent<\/code>\u6ce8\u89e3\u6807\u6ce8\u65b9\u6cd5\u4e0a\uff0c\u65b9\u6cd5\u8981\u6c42\uff1a\u65b9\u6cd5\u540d\u79f0\u4efb\u610f<\/strong>\uff0c\u65b9\u6cd5\u53c2\u6570\u53ef\u65e0<\/strong>\u3001\u53ef1\u4e2a<\/strong>\uff08\u5fc5\u987b\u662fLifecycleOwner<\/code>\uff09\u3001\u53ef2\u4e2a<\/strong>\uff08\u5fc5\u987b\u5148\u540e\u662fLifecycleOwner<\/code>\u3001Lifecycle.Event<\/code>\u3001\u4e14event<\/code>\u5fc5\u987b\u662fLifecycle.Event.ON_ANY<\/code>\uff09\u3002<\/p>\n
val lifecycleObserver = object : LifecycleObserver {\n    @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)\n    fun onCreate() {\n    }\n\n    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)\n    fun onResume(owner: LifecycleOwner) {\n    }\n\n    @OnLifecycleEvent(Lifecycle.Event.ON_ANY)\n    fun onAny(owner: LifecycleOwner, event: Lifecycle.Event) {\n    }\n}\n<\/code><\/pre>\n
\u6dfb\u52a0Observer<\/h2>\n
lifecycle.addObserver(lifecycleObserver)\n<\/code><\/pre>\n
\u79fb\u9664Observer<\/h2>\n
lifecycle.removeObserver(lifecycleObserver)\n<\/code><\/pre>\n
\u83b7\u53d6\u5f53\u524dState<\/h2>\n
val currentState = lifecycle.currentState\nval currentStateFlow = lifecycle.currentStateFlow\n<\/code><\/pre>\n
\u83b7\u53d6\u5f53\u524dEvent<\/h2>\n
val eventFlow = lifecycle.eventFlow\n<\/code><\/pre>\n
\u6e90\u7801<\/h1>\n
\u58f0\u660eLifecycleObserver<\/h2>\n
1. DefaultLifecycleObserver<\/h3>\n
DefaultLifecycleObserver\u63a5\u53e3<\/strong><\/p>\n
public interface DefaultLifecycleObserver : LifecycleObserver {\n\n    public fun onCreate(owner: LifecycleOwner) {}\n\n    public fun onStart(owner: LifecycleOwner) {}\n\n    public fun onResume(owner: LifecycleOwner) {}\n\n    public fun onPause(owner: LifecycleOwner) {}\n\n    public fun onStop(owner: LifecycleOwner) {}\n\n    public fun onDestroy(owner: LifecycleOwner) {}\n}\n\n<\/code><\/pre>\n
DefaultLifecycleObserver<\/code>\u63a5\u53e3\uff0c\u7ee7\u627fLifecycleObserver<\/code>\u63a5\u53e3\uff0c\u5e76\u8fdb\u884c\u4e86\u751f\u547d\u5468\u671f\u65b9\u6cd5\u9ed8\u8ba4\u7a7a<\/strong>\u5b9e\u73b0\uff0c\u6240\u4ee5\u53ef\u4ee5\u6309\u9700\u5b9e\u73b0<\/strong>\u67d0\u4e2a\u65b9\u6cd5\u3002<\/p>\n
LifecycleObserver\u63a5\u53e3<\/strong><\/p>\n
public interface LifecycleObserver\n<\/code><\/pre>\n
LifecycleObserver<\/code>\u662f\u4e00\u4e2a\u7a7a\u63a5\u53e3\uff0c\u7528\u4e8e\u6807\u8bb0<\/strong>\u53ef\u4ee5\u88abLifecycle<\/code>\u6dfb\u52a0\u3001\u5220\u9664\u3002\u53ef\u4ee5\u4f7f\u7528\u5b83\u7684\u5b50\u63a5\u53e3DefaultLifecycleObserver<\/code>\u3001LifecycleEventObserver<\/code>\u6216\u88ab<\/strong>OnLifecycleEvent\uff08\u5df2\u5f03\u7528\uff09<\/code>\u6807\u6ce8\u65b9\u6cd5\u7684\u5b50\u7c7b<\/strong>\uff0c\u6765\u901a\u77e5\u751f\u547d\u5468\u671f\u4e8b\u4ef6\uff0c\u8be6\u7ec6\u89c1\u540e\u9762-ObserverWithState<\/code>\u3002<\/p>\n
2. LifecycleEventObserver<\/h3>\n
LifecycleEventObserver\u63a5\u53e3<\/strong><\/p>\n
public fun interface LifecycleEventObserver : LifecycleObserver {\n\n    public fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event)\n}\n<\/code><\/pre>\n
LifecycleEventObserver<\/code>\u63a5\u53e3\uff0c\u4e3a\u751f\u547d\u5468\u671f\u72b6\u6001\u6539\u53d8\u65f6\uff0c\u4f1a\u8c03\u7528onStateChanged<\/code>\u65b9\u6cd5\uff08\u8be6\u7ec6\u89c1\u540e\u9762-ObserverWithState<\/code>\uff09\u3002\u53c2\u6570event<\/code>\u4e3a\u5f53\u524d\u7684\u4e8b\u4ef6\uff08ON_CREATE<\/code>\u3001ON_START<\/code>\u3001ON_RESUME<\/code>\u3001ON_PAUSE<\/code>\u3001ON_STOP<\/code>\u3001ON_DESTROY<\/code>\uff09\u3002<\/p>\n
3. OnLifecycleEvent\uff08\u5df2\u5f03\u7528\uff09<\/h3>\n
OnLifecycleEvent\u6ce8\u89e3<\/strong><\/p>\n
@Retention(RetentionPolicy.RUNTIME)\n@Target(ElementType.METHOD)\n@Deprecated\npublic @interface OnLifecycleEvent {\n    Lifecycle.Event value();\n}\n<\/code><\/pre>\n
OnLifecycleEvent<\/code>\u6ce8\u89e3\uff0c\u5f53\u751f\u547d\u5468\u671f\u72b6\u6001\u6539\u53d8\u65f6\uff0c\u4f1a\u8c03\u7528LifecycleObserver<\/code>\u5b50\u7c7b\u88ab\u5bf9\u5e94event\u6807\u6ce8\u7684<\/strong>\u65b9\u6cd5\uff08\u8be6\u7ec6\u89c1\u540e\u9762-ObserverWithState<\/code>\uff09\u3002OnLifecycleEvent<\/code>\u5df2\u88ab@Deprecated<\/code>\u6807\u6ce8\uff0c\u5df2\u7ecf\u88ab\u5f03\u7528\uff0c\u540e\u9762\u4f1a\u51cf\u5c11\u5bf9\u6b64\u7684\u8bb2\u89e3\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u662f\u5982\u679c\u628a\u4e0a\u97623\u79cd<\/strong>\u60c5\u51b5\u7684LifecycleObserver<\/code>\u7edf\u4e00<\/strong>\u7684\uff08\u597d\u65b9\u4fbf\u7edf\u4e00\u5206\u53d1\u4e8b\u4ef6\uff09\uff0c\u4ee5\u53ca\u662f\u5982\u4f55\u5206\u53d1\u4e8b\u4ef6\u7684\u3002<\/p>\n
\u7edf\u4e00LifecycleObserver<\/h2>\n
ObserverWithState\u7c7b<\/strong><\/p>\n
internal class ObserverWithState(observer: LifecycleObserver?, initialState: State) {\n    var state: State\n    var lifecycleObserver: LifecycleEventObserver\n\n    init {\n        \/\/ \u628a\u4e0a\u9762\u5168\u90e83\u79cd\u60c5\u51b5\u7684LifecycleObserver\u7edf\u4e00\u8f6c\u6362\u6210LifecycleEventObserver\u3002\n        lifecycleObserver = Lifecycling.lifecycleEventObserver(observer!!)\n        state = initialState\n    }\n\n    fun dispatchEvent(owner: LifecycleOwner?, event: Event) {\n        val newState = event.targetState\n        state = min(state, newState)\n        \/\/ \u7528\u8f6c\u6362\u540e\u7684LifecycleEventObserver\u901a\u77e5\u539f\u59cbobserver\u72b6\u6001\u6539\u53d8\u3002\n        lifecycleObserver.onStateChanged(owner!!, event)\n        state = newState\n    }\n}\n<\/code><\/pre>\n
ObserverWithState<\/code>\u4e3a\u5e26\u72b6\u6001<\/strong>\u7684\u89c2\u5bdf\u8005<\/strong>\uff0c\u5b83\u7edf\u4e00\u4e86\u5168\u90e83\u79cd<\/strong>\u60c5\u51b5\u7684LifecycleObserver<\/code>\u4e3aLifecycleEventObserver<\/code>\uff1b\u4ee5\u53cadispatchEvent()<\/code>\u65b9\u6cd5\uff0c\u7528\u8f6c\u6362\u540e\u7684LifecycleEventObserver<\/code>\u901a\u77e5\u539f\u59cbobserver<\/code>\u72b6\u6001\u6539\u53d8\u3002\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0bLifecycling<\/code>\u5b83\u662f\u5982\u4f55\u7edf\u4e00\u7684\u3002<\/p>\n
Lifecycling –> lifecycleEventObserver\u65b9\u6cd5<\/strong><\/p>\n
public actual fun lifecycleEventObserver(`object`: Any): LifecycleEventObserver {\n    \/\/ \u662f\u5426\u662fLifecycleEventObserver\u5b50\u7c7b\n    val isLifecycleEventObserver = `object` is LifecycleEventObserver\n    \/\/ \u662f\u5426\u662fDefaultLifecycleObserver\u5b50\u7c7b\n    val isDefaultLifecycleObserver = `object` is DefaultLifecycleObserver\n    if (isLifecycleEventObserver && isDefaultLifecycleObserver) {\n        \/\/ \u4e24\u8005\u90fd\u662f\uff0c\u9700\u8981\u9002\u914d\uff0c\u4e24\u4e2a\u6837\u5f0f\u56de\u8c03\u90fd\u901a\u77e5\u3002\n        return DefaultLifecycleObserverAdapter(\n            `object` as DefaultLifecycleObserver,\n            `object` as LifecycleEventObserver\n        )\n    }\n    if (isDefaultLifecycleObserver) {\n        \/\/ \u53ea\u662fDefaultLifecycleObserver\uff0c\u9700\u8981\u9002\u914d\uff0c\u53ea\u56de\u8c03\u4e00\u4e2a\u3002\n        return DefaultLifecycleObserverAdapter(`object` as DefaultLifecycleObserver, null)\n    }\n    if (isLifecycleEventObserver) {\n        \/\/ \u53ea\u662fLifecycleEventObserver\uff0c\u5373\u4e3a\u7ed3\u679c\uff0c\u4e0d\u7528\u9002\u914d\uff0c\u76f4\u63a5\u8fd4\u56de\u5373\u53ef\u3002\n        return `object` as LifecycleEventObserver\n    }\n    \/\/ \u4f7f\u7528OnLifecycleEvent\u6ce8\u89e3\u7684\u5904\u7406\n    val klass: Class<*> = `object`.javaClass\n    val type = getObserverConstructorType(klass)\n    if (type == GENERATED_CALLBACK) {\n        \/\/ \u4f7f\u7528OnLifecycleEvent\u6ce8\u89e3\uff0c\u5e76\u4e14\u4f9d\u8d56\u4e86androidx.lifecycle:lifecycle-compiler\u6ce8\u89e3\u5904\u7406\u5668\uff0c\u4f7f\u7528\u6ce8\u89e3\u5904\u7406\u5668\u4f18\u5316\u53cd\u5c04\u5e26\u6765\u7684\u6027\u80fd\u95ee\u9898\u3002\n        val constructors = classToAdapters[klass]!!\n        if (constructors.size == 1) {\n            val generatedAdapter = createGeneratedAdapter(\n                constructors[0], `object`\n            )\n            return SingleGeneratedAdapterObserver(generatedAdapter)\n        }\n        val adapters: Array<GeneratedAdapter> = Array(constructors.size) { i ->\n            createGeneratedAdapter(constructors[i], `object`)\n        }\n        return CompositeGeneratedAdaptersObserver(adapters)\n    }\n    \/\/ \u4f7f\u7528OnLifecycleEvent\u6ce8\u89e3\uff0c\u5e76\u4e14\u672a\u4f9d\u8d56\u6ce8\u89e3\u5904\u7406\u5668\uff0c\u4f7f\u7528\u53cd\u5c04\u5904\u7406\u3002\n    return ReflectiveGenericLifecycleObserver(`object`)\n}\n<\/code><\/pre>\n
lifecycleEventObserver()<\/code>\u65b9\u6cd5\uff0c\u5c06\u53c2\u6570LifecycleObserver<\/code>\u8f6c\u4e3a\u7edf\u4e00<\/strong>\u7684LifecycleEventObserver<\/code>\u3002<\/p>\n
\n  \u8bf4\u660e\uff1a<\/p>\n
  \u4e0a\u97623\u79cdLifecycleObserver<\/code>\u60c5\u51b5\u9002\u914d\uff1a<\/p>\n
    \n
  1. \u53ea\u662fLifecycleEventObserver<\/code>\uff1a\u5373\u4e3a\u7ed3\u679c\uff0c\u4e0d\u7528\u9002\u914d\u3002<\/li>\n
  2. \u53ea\u662fDefaultLifecycleObserver<\/code>\u3001\u4e24\u8005\u90fd\u662f<\/strong>\uff1a\u4f7f\u7528DefaultLifecycleObserverAdapter<\/code>\u9002\u914d\u3002<\/li>\n
  3. OnLifecycleEvent<\/code>\u6ce8\u89e3\uff1a\u4f7f\u7528SingleGeneratedAdapterObserver<\/code>\u6216CompositeGeneratedAdaptersObserver<\/code>\u6216ReflectiveGenericLifecycleObserver<\/code>\u9002\u914d\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
    \u7531\u4e8e\u53ea\u662fLifecycleEventObserver<\/code>\uff0c\u4e0d\u9700\u8981\u9002\u914d\uff0c\u6240\u4ee5\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0bDefaultLifecycleObserverAdapter<\/code>\u7684\u9002\u914d\u3002<\/p>\n
    DefaultLifecycleObserverAdapter<\/h3>\n
    DefaultLifecycleObserverAdapter\u7c7b<\/strong><\/p>\n
    internal class DefaultLifecycleObserverAdapter(\n    private val defaultLifecycleObserver: DefaultLifecycleObserver,\n    private val lifecycleEventObserver: LifecycleEventObserver?\n) : LifecycleEventObserver {\n    override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) {\n        \/\/ \u4ee5\u5bf9\u5e94\u751f\u547d\u5468\u671f\u65b9\u6cd5\u56de\u8c03\u65b9\u5f0f\u901a\u77e5\n        when (event) {\n            Lifecycle.Event.ON_CREATE -> defaultLifecycleObserver.onCreate(source)\n            Lifecycle.Event.ON_START -> defaultLifecycleObserver.onStart(source)\n            Lifecycle.Event.ON_RESUME -> defaultLifecycleObserver.onResume(source)\n            Lifecycle.Event.ON_PAUSE -> defaultLifecycleObserver.onPause(source)\n            Lifecycle.Event.ON_STOP -> defaultLifecycleObserver.onStop(source)\n            Lifecycle.Event.ON_DESTROY -> defaultLifecycleObserver.onDestroy(source)\n            Lifecycle.Event.ON_ANY ->\n                throw IllegalArgumentException(\"ON_ANY must not been send by anybody\")\n        }\n        \/\/ \u4ee5\u72b6\u6001\u6539\u53d8\u56de\u8c03\u65b9\u5f0f\u901a\u77e5\n        lifecycleEventObserver?.onStateChanged(source, event)\n    }\n}\n<\/code><\/pre>\n
    DefaultLifecycleObserverAdapter<\/code>\u7c7b\uff0c\u4e3aDefaultLifecycleObserver<\/code>\u60c5\u51b5\u505a\u9002\u914d<\/strong>\uff0c\u4f46\u662f\u4e3a\u4e86\u517c\u5bb9\u6027\uff0c\u652f\u6301\u4e00\u4e2a\u7c7b\u540c\u65f6<\/strong>\u5b9e\u73b0DefaultLifecycleObserver<\/code>\u3001LifecycleEventObserver<\/code>\u7684\u60c5\u51b5\u3002<\/p>\n
    \u548cOnLifecycleEvent<\/code>\u6ce8\u89e3\u76f8\u5173\u7684\u9002\u914d\u5668\u67093\u4e2a\uff0c\u7531\u4e8eOnLifecycleEvent<\/code>\u5df2\u7ecf\u5f03\u7528\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u8bb21\u4e2a\u53cd\u5c04\u7684\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0bReflectiveGenericLifecycleObserver<\/code>\u7684\u9002\u914d\u3002<\/p>\n
    ReflectiveGenericLifecycleObserver<\/h3>\n
    ReflectiveGenericLifecycleObserver\u7c7b<\/strong><\/p>\n
    @Deprecated\nclass ReflectiveGenericLifecycleObserver implements LifecycleEventObserver {\n    private final Object mWrapped;\n    private final androidx.lifecycle.ClassesInfoCache.CallbackInfo mInfo;\n\n    @SuppressWarnings(\"deprecation\")\n    ReflectiveGenericLifecycleObserver(Object wrapped) {\n        mWrapped = wrapped;\n        \/\/ \u83b7\u53d6\u89c2\u5bdf\u8005\u7c7b\u7684\u4fe1\u606f\uff0c\u5185\u90e8\u4f1a\u89e3\u6790\u5224\u65ad\u88abOnLifecycleEvent\u6ce8\u89e3\u7684\u65b9\u6cd5\u58f0\u660e\u662f\u5426\u6b63\u786e\u3002\n        mInfo = ClassesInfoCache.sInstance.getInfo(mWrapped.getClass());\n    }\n\n    @Override\n    public void onStateChanged(@NonNull LifecycleOwner source, @NonNull Event event) {\n        \/\/ \u8c03\u7528\u88abOnLifecycleEvent\u6807\u6ce8\u7684\u5bf9\u5e94\u7684\u65b9\u6cd5\uff0c\u901a\u77e5\u56de\u8c03\u3002\n        mInfo.invokeCallbacks(source, event, mWrapped);\n    }\n}\n<\/code><\/pre>\n
    ReflectiveGenericLifecycleObserver<\/code>\u7c7b\uff0c\u4e3a\u4f7f\u7528OnLifecycleEvent<\/code>\u6ce8\u89e3<\/strong>\u5e76\u4e14\u65e0\u4f7f\u7528<\/strong>androidx.lifecycle:lifecycle-compiler<\/code>\u6ce8\u89e3\u5904\u7406\u5668\u60c5\u51b5\u505a\u9002\u914d<\/strong>\u3002<\/p>\n
    ClassesInfoCache –> getInfo\u65b9\u6cd5<\/strong><\/p>\n
    CallbackInfo getInfo(Class<?> klass) {\n    CallbackInfo existing = mCallbackMap.get(klass);\n    if (existing != null) {\n        return existing;\n    }\n    existing = createInfo(klass, null);\n    return existing;\n}\n<\/code><\/pre>\n
    ClassesInfoCache<\/code>\u7c7b\u7684getInfo<\/code>\u65b9\u6cd5\uff0c\u4e00\u5f00\u59cb\u7f13\u5b58\u91cc\u9762\u662f\u6ca1\u6709\u7684\uff0c\u7136\u540e\u4f1a\u8c03\u7528createInfo()<\/code>\u65b9\u6cd5\u8fdb\u884c\u521b\u5efa<\/strong>\u5e76\u5b58\u50a8\u5230\u7f13\u5b58\u5e76\u8fd4\u56de\u5176\u7ed3\u679c\u3002<\/p>\n
    ClassesInfoCache –> createInfo\u65b9\u6cd5<\/strong><\/p>\n
    private CallbackInfo createInfo(Class<?> klass, @Nullable Method[] declaredMethods) {\n    ...\n    for (Method method : methods) {\n        OnLifecycleEvent annotation = method.getAnnotation(OnLifecycleEvent.class);\n        if (annotation == null) {\n            continue;\n        }\n        hasLifecycleMethods = true;\n        Class<?>[] params = method.getParameterTypes();\n        int callType = CALL_TYPE_NO_ARG;\n        if (params.length > 0) {\n            callType = CALL_TYPE_PROVIDER;\n            \/\/ \u7b2c1\u4e2a\u53c2\u6570\u5fc5\u987b\u662fLifecycleOwner\uff0c\u5426\u5219\u629b\u5f02\u5e38\u3002\n            if (!params[0].isAssignableFrom(LifecycleOwner.class)) {\n                throw new IllegalArgumentException(\n                        \"invalid parameter type. Must be one and instanceof LifecycleOwner\");\n            }\n        }\n        Lifecycle.Event event = annotation.value();\n\n        if (params.length > 1) {\n            callType = CALL_TYPE_PROVIDER_WITH_EVENT;\n            \/\/ \u7b2c2\u4e2a\u53c2\u6570\u5fc5\u987b\u662fLifecycle.Event\uff0c\u5426\u5219\u629b\u5f02\u5e38\u3002\n            if (!params[1].isAssignableFrom(Lifecycle.Event.class)) {\n                throw new IllegalArgumentException(\n                        \"invalid parameter type. second arg must be an event\");\n            }\n            \/\/ \u5e76\u4e14OnLifecycleEvent\u6ce8\u89e3\u7684\u503c\u5fc5\u987b\u662fLifecycle.Event.ON_ANY\uff0c\u5426\u5219\u629b\u5f02\u5e38\u3002\n            if (event != Lifecycle.Event.ON_ANY) {\n                throw new IllegalArgumentException(\n                        \"Second arg is supported only for ON_ANY value\");\n            }\n        }\n        if (params.length > 2) {\n            \/\/ \u8d85\u8fc72\u4e2a\u53c2\u6570\uff0c\u62a5\u9519\u3002\n            throw new IllegalArgumentException(\"cannot have more than 2 params\");\n        }\n        ...\n    }\n    CallbackInfo info = new CallbackInfo(handlerToEvent);\n    \/\/ \u5b58\u50a8\u5230\u7f13\u5b58\n    mCallbackMap.put(klass, info);\n    ...\n    return info;\n}\n<\/code><\/pre>\n
    \n  \u8bf4\u660e\uff1a<\/p>\n
      \n
    1. \u4f7f\u7528OnLifecycleEvent<\/code>\u6ce8\u89e3\u6807\u6ce8\u65b9\u6cd5\u4e0a\uff0c\u65b9\u6cd5\u8981\u6c42\uff1a\u65b9\u6cd5\u540d\u79f0\u4efb\u610f<\/strong>\uff0c\u65b9\u6cd5\u53c2\u6570\u53ef\u65e0<\/strong>\u3001\u53ef1\u4e2a<\/strong>\uff08\u5fc5\u987b\u662fLifecycleOwner<\/code>\uff09\u3001\u53ef2\u4e2a<\/strong>\uff08\u5fc5\u987b\u5148\u540e\u662fLifecycleOwner<\/code>\u3001Lifecycle.Event<\/code>\u3001\u4e14event<\/code>\u5fc5\u987b\u662fLifecycle.Event.ON_ANY<\/code>\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
      \u5c0f\u7ed3<\/h3>\n
      \n  \u8bf4\u660e\uff1a<\/p>\n
        \n
      1. ObserverWithState<\/code>\u4e3a\u5e26\u72b6\u6001<\/strong>\u7684\u89c2\u5bdf\u8005<\/strong>\uff0c\u5b83\u7edf\u4e00\u4e86\u5168\u90e83\u79cd<\/strong>\u60c5\u51b5\u7684LifecycleObserver<\/code>\u4e3aLifecycleEventObserver<\/code>\uff1b\u4ee5\u53cadispatchEvent()<\/code>\u65b9\u6cd5\uff0c\u7528\u8f6c\u6362\u540e\u7684LifecycleEventObserver<\/code>\u901a\u77e5<\/strong>\u539f\u59cbobserver<\/code>\u72b6\u6001\u6539\u53d8\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
        \u4e0a\u9762\u4f7f\u7528<\/strong>\u7684\u6dfb\u52a0\u3001\u5220\u9664\u3001\u83b7\u53d6\u5f53\u524d\u72b6\u6001\u7b49\uff0c\u90fd\u662f\u8981\u5148\u83b7\u53d6\u5230\u5f53\u524d\u7684<\/strong>Lifecycle<\/code>\u7684\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0bLifecycle<\/code>\u7c7b\u7684\u5b9a\u4e49\uff0c\u518d\u770b\u4e00\u4e0bActivity<\/code>\u3001Fragment<\/code>\u662f\u5982\u4f55\u83b7\u53d6Lifecycle<\/code>\u7684\u3002<\/p>\n
        \u83b7\u53d6Lifecycle<\/h2>\n
        Lifecycle\u7c7b<\/strong><\/p>\n
        public abstract class Lifecycle {\n\n    \/\/ \u534f\u7a0b\u76f8\u5173\uff0c\u5b58\u653ecoroutineScope\u7684\u3002\n    @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n    @get:RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n    @set:RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)\n    public var internalScopeRef: AtomicReference<Any?> = AtomicReference(null)\n\n    \/\/ \u6dfb\u52a0\u89c2\u5bdf\u8005\n    @MainThread\n    public abstract fun addObserver(observer: LifecycleObserver)\n\n    \/\/ \u79fb\u9664\u89c2\u5bdf\u8005\n    @MainThread\n    public abstract fun removeObserver(observer: LifecycleObserver)\n\n    \/\/ \u83b7\u53d6\u5f53\u524d\u7684\u72b6\u6001\n    @get:MainThread\n    public abstract val currentState: State\n\n    \/\/ \u83b7\u53d6\u5f53\u524d\u7684\u72b6\u6001-Flow\n    public open val currentStateFlow: StateFlow<Lifecycle.State>\n        get() {\n            val mutableStateFlow = MutableStateFlow(currentState)\n            LifecycleEventObserver { _, event ->\n                mutableStateFlow.value = event.targetState\n            }.also { addObserver(it) } \/\/ \u901a\u8fc7addObserver()\u6765\u89c2\u5bdf\uff0c\u83b7\u53d6\u5f53\u524dEvent\u7684State\u3002\n            return mutableStateFlow.asStateFlow()\n        }\n\n    \/\/ \u4e8b\u4ef6\u7c7b\n    public enum class Event {\n        ON_CREATE,\n        ON_START,\n        ON_RESUME,\n        ON_PAUSE,\n        ON_STOP,\n        ON_DESTROY,\n        ON_ANY; \/\/ \u4efb\u4f55\u4e8b\u4ef6\u90fd\u4f1a\u89e6\u53d1\n\n        \/\/ \u8fd4\u56de\u6b64Event\u7684\u5bf9\u5e94\u7684State\u3002\n        \/\/ \u5982\u679cON_ANY\u88ab\u8c03\u7528\uff0c\u629b\u51faIllegalArgumentException\uff0c\u56e0\u4e3a\u5b83\u662fOnLifecycleEvent\u4f7f\u7528\u7684\u7279\u6b8a\u503c\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u771f\u6b63\u7684\u751f\u547d\u5468\u671fEvent\u3002        \n        public val targetState: State\n            get() {\n                when (this) {\n                    ON_CREATE, ON_STOP -> return State.CREATED\n                    ON_START, ON_PAUSE -> return State.STARTED\n                    ON_RESUME -> return State.RESUMED\n                    ON_DESTROY -> return State.DESTROYED\n                    ON_ANY -> {}\n                }\n                throw IllegalArgumentException(\"$this has no target state\")\n            }\n\n        public companion object {\n            \/\/ \u4ee5\u4e0b\u4e3aState\u8f6cEvent\u76f8\u5173\n            @JvmStatic\n            public fun downFrom(state: State): Event? {\n                return when (state) {\n                    State.CREATED -> ON_DESTROY\n                    State.STARTED -> ON_STOP\n                    State.RESUMED -> ON_PAUSE\n                    else -> null\n                }\n            }\n\n            @JvmStatic\n            public fun downTo(state: State): Event? {\n                return when (state) {\n                    State.DESTROYED -> ON_DESTROY\n                    State.CREATED -> ON_STOP\n                    State.STARTED -> ON_PAUSE\n                    else -> null\n                }\n            }\n\n            @JvmStatic\n            public fun upFrom(state: State): Event? {\n                return when (state) {\n                    State.INITIALIZED -> ON_CREATE\n                    State.CREATED -> ON_START\n                    State.STARTED -> ON_RESUME\n                    else -> null\n                }\n            }\n\n            @JvmStatic\n            public fun upTo(state: State): Event? {\n                return when (state) {\n                    State.CREATED -> ON_CREATE\n                    State.STARTED -> ON_START\n                    State.RESUMED -> ON_RESUME\n                    else -> null\n                }\n            }\n        }\n    }\n\n    \/\/ \u72b6\u6001\u7c7b\n    public enum class State {\n        DESTROYED,\n        INITIALIZED,\n        CREATED,\n        STARTED,\n        RESUMED;\n\n        \/\/ \u6bd4\u8f83\u8fd9\u4e2a\u72b6\u6001\u662f\u5426\u5927\u4e8e\u7b49\u4e8e\u7ed9\u5b9a\u7684\u72b6\u6001\uff0cRESUMED > STARTED > CREATED > INITIALIZED > DESTROYED\u3002\n        public fun isAtLeast(state: State): Boolean {\n            return compareTo(state) >= 0\n        }\n    }\n}\n<\/code><\/pre>\n
        State<\/code>\u548cEvent<\/code>\u7684\u5173\u7cfb\u56fe<\/strong><\/p>\n
        \"lifecycle-states.svg\"<\/div><\/p>\n
         <\/h2>\n
        \u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\uff0c\u4eceActvity<\/code>\u3001Fragment<\/code>\u4e2d\u662f\u5982\u4f55\u83b7\u53d6\u5230Lifecycle<\/code>\u7684\uff0c\u56e0\u4e3aandroidx.activity.ComponentActivity<\/code>\u548candroidx.fragment.app.Fragment<\/code>\u90fd\u5b9e\u73b0\u4e86LifecycleOwner<\/code>\u63a5\u53e3\uff0c\u8868\u660e\u53ef\u4ee5\u63d0\u4f9bLifecycle<\/code>\u5b9e\u4f8b\uff0c\u76f8\u5173\u7684\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n
        LifecycleOwner\u63a5\u53e3<\/strong><\/p>\n
        public interface LifecycleOwner {\n\n    public val lifecycle: Lifecycle\n}\n<\/code><\/pre>\n
        \u6211\u4eec\u5148\u6765\u770b\u4e0bActivity<\/code>\u7684LifecycleOwner<\/code>\u63a5\u53e3\u7684\u5b9e\u73b0<\/p>\n
        Activity<\/h3>\n
        androidx.activity.ComponentActivity –> lifecycle<\/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 lifecycle: Lifecycle\n        get() = super.lifecycle\n}\n<\/code><\/pre>\n
        androidx.activity.ComponentActivity<\/code>\u7684lifecycle<\/code>\uff0c\u8c03\u7528\u4e86\u7236\u7c7b\u7684\uff0c\u6211\u4eec\u518d\u6765\u7236\u7c7b\u7684\u3002<\/p>\n
        androidx.core.app.ComponentActivity –> getLifecycle\u65b9\u6cd5<\/strong><\/p>\n
        public open class ComponentActivity : Activity(), LifecycleOwner, KeyEventDispatcher.Component {\n\n    @Suppress(\"LeakingThis\") private val lifecycleRegistry = LifecycleRegistry(this)\n\n    override val lifecycle: Lifecycle\n        get() = lifecycleRegistry\n}\n<\/code><\/pre>\n
        androidx.core.app.ComponentActivity<\/code>\u7684lifecycle<\/code>\uff0c\u83b7\u53d6\u4e86LifecycleRegistry<\/code>\u5b9e\u4f8b\uff0c\u6211\u4eec\u5148\u6765\u770bFragment<\/code>\u7684\u5b9e\u73b0\uff0c\u7136\u540e\u518d\u770bLifecycleRegistry<\/code>\u6e90\u7801\u3002<\/p>\n
        \n  \u8bf4\u660e\uff1a<\/p>\n
          \n
        1. MyActivity<\/code>\u7ee7\u627f\u5173\u7cfb\uff1aMyActivity<\/code>->AppCompatActivity<\/code>->FragmentActivity<\/code>->androidx.activity.ComponentActivity<\/code>->androidx.core.app.ComponentActivity<\/code><\/li>\n<\/ol>\n<\/blockquote>\n
          \u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0bFragment<\/code>\u7684LifecycleOwner<\/code>\u63a5\u53e3\u7684\u5b9e\u73b0<\/p>\n
          Fragment<\/h3>\n
          androidx.fragment.app.Fragment –> getLifecycle\u65b9\u6cd5<\/strong><\/p>\n
          public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener, LifecycleOwner,\n        ViewModelStoreOwner, HasDefaultViewModelProviderFactory, SavedStateRegistryOwner,\n        ActivityResultCaller {\n    LifecycleRegistry mLifecycleRegistry;\n\n    @Override\n    @NonNull\n    public Lifecycle getLifecycle() {\n        return mLifecycleRegistry;\n    }\n\n    public Fragment() {\n        initLifecycle();\n    }\n\n    private void initLifecycle() {\n        mLifecycleRegistry = new LifecycleRegistry(this);\n    }\n}\n<\/code><\/pre>\n
          androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u90fd\u5b9e\u73b0\u4e86LifecycleOwner<\/code>\u63a5\u53e3\uff0c\u5e76\u8fd4\u56de\u7684\u90fd\u662fLifecycleRegistry<\/code>\u5b9e\u4f8b\uff08\u62ff\u5230lifecycle<\/code>\u540e\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u662f\u64cd\u4f5c\u7684\u6b64\u7c7b<\/strong>\uff09\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e00\u4e0bLifecycleRegistry<\/code>\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n
          LifecycleRegistry –> \u6784\u9020\u65b9\u6cd5<\/strong><\/p>\n
          public actual open class LifecycleRegistry private constructor(\n    provider: LifecycleOwner,\n    \/\/ \u662f\u5426\u5f3a\u5236\u5728\u4e3b\u7ebf\u7a0b\u6267\u884c\n    private val enforceMainThread: Boolean\n) : Lifecycle() {\n\n    public actual constructor(provider: LifecycleOwner) : this(provider, true) \/\/ \u9ed8\u8ba4\uff0c\u5f3a\u5236\u5728\u4e3b\u7ebf\u7a0b\u6267\u884c\u3002\n}\n<\/code><\/pre>\n
          LifecycleRegistry<\/code>\u7c7b\uff0c\u7ee7\u627fLifecycle<\/code>\u7c7b\uff0candroidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u90fd\u4f7f\u7528\u4e86LifecycleRegistry(this)<\/code>\uff0c\u6240\u4ee5\u4ed6\u4eec\u90fd\u662f\u5f3a\u5236\u5728\u4e3b\u7ebf\u7a0b\u6267\u884c<\/strong>\u3002<\/p>\n
          \u5c0f\u7ed3<\/h3>\n
          \n  \u8bf4\u660e\uff1a<\/p>\n
            \n
          1. androidx<\/code>\u7684Activity<\/code>\u3001Fragment<\/code>\u83b7\u53d6Lifecycle<\/code>\uff0c\u83b7\u53d6\u7684\u90fd\u662fLifecycle<\/code>\u7684\u5b9e\u73b0\u7c7bLifecycleRegistry<\/code>\uff0c\u540e\u7eed\u7684\u64cd\u4f5c\u90fd\u662f\u64cd\u4f5c\u7684\u6b64\uff0c\u5e76\u4e14\u6709\u4e9b\u64cd\u4f5c\u8981\u6c42\u53ea\u80fd\u5728\u4e3b\u7ebf\u7a0b<\/strong>\u6267\u884c\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
            \u6dfb\u52a0Observer<\/h2>\n
            LifecycleRegistry –> addObserver()\u65b9\u6cd5<\/strong><\/p>\n
            override fun addObserver(observer: LifecycleObserver) {\n    \/\/ \u5f53enforceMainThread\u4e3atrue\u65f6\uff0c\u5fc5\u987b\u662f\u5728\u4e3b\u7ebf\u7a0b\u8c03\u7528\uff0c\u5426\u5219\u629b\u51fa\u5f02\u5e38\n    enforceMainThreadIfNeeded(\"addObserver\")\n    \/\/ \u89c2\u5bdf\u8005\u7684\u521d\u59cb\u5316\u72b6\u6001\n    val initialState = if (state == State.DESTROYED) State.DESTROYED else State.INITIALIZED\n    \/\/ \u751f\u6210ObserverWithState\uff0c\u5b83\u5305\u542b\u72b6\u6001\u548c\u89c2\u5bdf\u8005\uff0c\u5b83\u4f1a\u628a\u4e0a\u9762\u5168\u90e83\u79cd\u60c5\u51b5\u7684LifecycleObserver\u7edf\u4e00\u8f6c\u6362\u6210LifecycleEventObserver\u3002\n    val statefulObserver = ObserverWithState(observer, initialState)\n    \/\/ \u5c06\u89c2\u5bdf\u8005\u6dfb\u52a0\u5230map\uff0c\u5982\u679c\u5df2\u7ecf\u6dfb\u52a0\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u3002\n    \/\/ putIfAbsent\uff0c\u5982\u679c\u4f20\u5165key\u5bf9\u5e94\u7684value\u5df2\u7ecf\u5b58\u5728\uff0c\u5c31\u8fd4\u56de\u5b58\u5728\u7684value\uff0c\u4e0d\u8fdb\u884c\u66ff\u6362\u3002\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5c31\u6dfb\u52a0key\u548cvalue\uff0c\u5e76\u8fd4\u56denull\u3002\n    val previous = observerMap.putIfAbsent(observer, statefulObserver)\n    if (previous != null) {\n        \/\/ \u4e4b\u524d\u6709\u6b64\u89c2\u5bdf\u8005\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u3002\n        return\n    }\n    \/\/ \u83b7\u53d6LifecycleOwner\u5b9e\u4f8b\uff0c\u4e00\u822c\u6765\u8bf4\u662fActivity\u6216\u8005Fragment\u5b9e\u4f8b\u3002\n    val lifecycleOwner = lifecycleOwner.get()\n        ?: \/\/ \u5bf9\u8c61\u4e3a\u7a7a\uff0c\u8bf4\u660e\u5df2\u7ecf\u88ab\u9500\u6bc1\uff0c\u76f4\u63a5\u8fd4\u56de\u3002\n        return\n    \/\/ isReentrance\uff1a\u662f\u5426\u662f\u518d\u6b21\u8fdb\u5165\n    \/\/ 1.addingObserverCounter\uff1a\u6dfb\u52a0\u4e2d\u7684\u89c2\u5bdf\u8005\u6570\u91cf\u3002\u5728\u6267\u884c\u524d\u52a01\uff0c\u5728\u6267\u884c\u540e\u51cf1\uff0c\u53c8\u56e0\u4e3aaddObserver\u65b9\u6cd5\u5f3a\u5236\u5728\u4e3b\u7ebf\u7a0b\u6267\u884c\uff08\u6ca1\u6709\u5e76\u53d1\uff09\uff0c\u6240\u4ee5\u5b83\u4e00\u822c\u90fd\u4e3a0\u3002\u4e4b\u6240\u4ee5\u4e0d\u4e3a0\uff0c\u662f\u56e0\u4e3a\u5b83\u5728\u6dfb\u52a0\u7684observer\u7684\u751f\u547d\u5468\u671f\u56de\u8c03\u7684\u65b9\u6cd5\u5185\uff0c\u53c8\u8c03\u7528addObserver\u65b9\u6cd5\u589e\u52a0\u4e86\u4e00\u4e2a\u65b0\u7684LifecycleObserver\u3002\n    \/\/ 2.handlingEvent\uff1a\u662f\u5426\u6b63\u5728\u5904\u7406\u4e8b\u4ef6\u4e2d\u3002\n    val isReentrance = addingObserverCounter != 0 || handlingEvent\n    \/\/ \u8ba1\u7b97\u76ee\u6807\u72b6\u6001\n    var targetState = calculateTargetState(observer)\n    \/\/ \u589e\u52a0\u4e2d\u7684\u89c2\u5bdf\u8005\u6570\u91cf\u52a01\n    addingObserverCounter++\n    \/\/ statefulObserver.state < targetState\uff1a\u8bf4\u660e\u89c2\u5bdf\u8005ObserverWithState\u7684\u72b6\u6001\u672a\u5230\u8fbe\u76ee\u6807\u72b6\u6001\u3002\n    \/\/ observerMap.contains(observer)\uff1a\u4e0a\u9762\u5df2observerMap.putIfAbsent()\u5224\u65ad\uff0c\u8fd9\u8fb9\u518d\u5224\u65ad\u662f\u5426\u5305\u542b\uff0c\u662f\u56e0\u4e3a\u5b83\u5728\u6dfb\u52a0\u7684observer\u7684\u751f\u547d\u5468\u671f\u56de\u8c03\u7684\u65b9\u6cd5\u5185\uff0c\u53ef\u80fd\u8c03\u7528\u4e86removeObserver\u3002\n    \/\/ \u4f7f\u7528while\uff0c\u4fdd\u8bc1\u4f9d\u6b21\u5206\u53d1\u6240\u6709\u7684\u4e8b\u4ef6\u3002    \n    while (statefulObserver.state < targetState && observerMap.contains(observer)) {\n        \/\/ \u7236\u72b6\u6001\u6dfb\u52a0\u4e00\u4e2a\n        pushParentState(statefulObserver.state)\n        \/\/ \u83b7\u53d6\u89c2\u5bdf\u8005\u72b6\u6001\u7684\u4e0b\u4e00\u4e2a\u4e8b\u4ef6\n        val event = Event.upFrom(statefulObserver.state)\n            ?: throw IllegalStateException(\"no event up from ${statefulObserver.state}\")\n        \/\/ \u89c2\u5bdf\u8005ObserverWithState\u5206\u53d1\u4e8b\u4ef6\uff0c\u901a\u77e5\u88abLifecycle\u6dfb\u52a0\u7684LifecycleObserver\u72b6\u6001\u6539\u53d8\u3002\n        statefulObserver.dispatchEvent(lifecycleOwner, event)\n        \/\/ \u7236\u72b6\u6001\u79fb\u9664\u4e00\u4e2a\n        popParentState()\n        \/\/ \u76ee\u6807\u72b6\u6001\u53ef\u80fd\u88ab\u66f4\u6539\uff0c\u91cd\u65b0\u8ba1\u7b97\n        targetState = calculateTargetState(observer)\n    }\n    if (!isReentrance) {\n        \/\/ \u4e0d\u662f\u518d\u6b21\u8fdb\u5165\uff0c\u540c\u6b65\u3002\n        sync()\n    }\n    \/\/ \u589e\u52a0\u4e2d\u7684\u89c2\u5bdf\u8005\u6570\u91cf\u51cf1\n    addingObserverCounter--\n}\n<\/code><\/pre>\n
            addObserver(observer)<\/code>\u65b9\u6cd5\uff0c\u5c06\u6b64observer<\/code>\u5305\u88c5\u4e3a\u5e26\u6709\u72b6\u6001\u7684ObserverWithState<\/code>\uff0c\u5982\u679c\u6b64\u5305\u88c5\u8005<\/strong>\u7684\u72b6\u6001\u4e00\u76f4\u672a\u5230\u8fbe\u76ee\u6807\u72b6\u6001<\/strong>\uff0c\u5219\u4e00\u76f4\u5faa\u73af\u5206\u53d1\u4e8b\u4ef6<\/strong>\uff0c\u76f4\u5230\u76f8\u540c\u4e3a\u6b62\u3002<\/p>\n
            \n  \u8bf4\u660e\uff1a<\/p>\n
              \n
            1. addObserver(observer)<\/code>\uff0c\u53ea\u80fd\u5728\u4e3b\u7ebf\u7a0b<\/strong>\u6267\u884c\u3002<\/li>\n
            2. targetState<\/code>\u4e00\u822c\u4e3astate<\/code>\uff08\u5f53\u524d\u72b6\u6001\uff09\uff0c\u89c2\u5bdf\u8005ObserverWithState<\/code>\u521d\u59cb\u5316\u72b6\u6001\u4e00\u822c\u4e3aINITIALIZED<\/code>\uff0c\u5982\u679c\u6b64\u5305\u88c5\u8005<\/strong>\u7684\u72b6\u6001\u4e00\u76f4\u672a\u5230\u8fbe\u76ee\u6807\u72b6\u6001<\/strong>\uff0c\u5219\u4e00\u76f4\u5faa\u73af\u5206\u53d1\u4e8b\u4ef6<\/strong>\uff0c\u76f4\u5230\u76f8\u540c\u4e3a\u6b62\u3002\u4f8b\u5982\uff1a\u5982\u679c\u5728Activity<\/code>\u7684onResume<\/code>\u540eaddObserver<\/code>\uff0c\u5219\u5f53\u524d\u72b6\u6001\u4e3aRESUMED<\/code>\uff0c\u89c2\u5bdf\u8005\u7684\u72b6\u6001\u4e3aINITIALIZED<\/code>\u5230RESUMED<\/code>\uff0c\u6240\u4ee5\u6b64\u89c2\u5bdf\u8005\u4f1a\u4f9d\u6b21<\/strong>\u63a5\u6536\u5230ON_CREATE<\/code>\u3001ON_START<\/code>\u3001ON_RESUME<\/code>\u4e8b\u4ef6\u7684\u56de\u8c03\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
              \u5c0f\u7ed3<\/h3>\n
              \n  \u4ee3\u7801\u6d41\u7a0b\uff1a
              \n  1. LifecycleRegistry<\/code>\u7c7baddObserver()<\/code>\u65b9\u6cd5\uff0c\u4f1a\u628a\u89c2\u5bdf\u8005<\/strong>\u548c\u72b6\u6001<\/strong>\u7684\u5305\u88c5\u4e3aObserverWithState<\/code>\uff0c\u5e76\u6dfb\u52a0\u5230observerMap<\/code>\u96c6\u5408\u4ee5\u8bb0\u5f55\u6240\u6709<\/strong>\u89c2\u5bdf\u8005\uff0c\u5e76\u4e14\u6dfb\u52a0\u65f6<\/strong>\u4f1a\u901a\u77e5\u6b64\u89c2\u5bdf\u8005\u5206\u53d1\u4e8b\u4ef6<\/strong>\uff0c\u6240\u4ee5\u6b64\u81ea\u5e26\u7c98\u6027\u6548\u679c<\/strong>\u3002
              \n  2. \u5982\u679c\u89c2\u5bdf\u8005\u7684\u72b6\u6001<\/strong>\u4e00\u76f4\u672a\u5230\u8fbe\u76ee\u6807\u72b6\u6001<\/strong>\uff0c\u5219\u4e00\u76f4\u5faa\u73af\u5206\u53d1\u4e8b\u4ef6<\/strong>\uff0c\u76f4\u5230\u76f8\u540c\u4e3a\u6b62\uff0c\u6240\u4ee5\u6dfb\u52a0\u65f6<\/strong>\u4f1a\u4f9d\u6b21<\/strong>\u6536\u5230\u591a\u4e2a<\/strong>\u4e8b\u4ef6\u3002\n<\/p><\/blockquote>\n
              \u79fb\u9664Observer<\/h2>\n
              LifecycleRegistry –> removeObserver\u65b9\u6cd5<\/strong><\/p>\n
              override fun removeObserver(observer: LifecycleObserver) {\n    \/\/ \u5f53enforceMainThread\u4e3atrue\u65f6\uff0c\u5fc5\u987b\u662f\u5728\u4e3b\u7ebf\u7a0b\u8c03\u7528\uff0c\u5426\u5219\u629b\u51fa\u5f02\u5e38\n    enforceMainThreadIfNeeded(\"removeObserver\")    \n    \/\/ \u4ecemap\u4e2d\u79fb\u9664\n    observerMap.remove(observer)\n}\n<\/code><\/pre>\n
              removeObserver()<\/code>\u65b9\u6cd5\uff0c\u4eceobserverMap<\/code>\u4e2d\u79fb\u9664\u3002<\/p>\n
              \u83b7\u53d6\u5f53\u524dState<\/h2>\n
              currentState<\/h3>\n
              LifecycleRegistry –> currentState<\/strong><\/p>\n
              actual override var currentState: State\n    get() = state\n\n    set(state) {\n        \/\/ \u5f53enforceMainThread\u4e3atrue\u65f6\uff0c\u5fc5\u987b\u662f\u5728\u4e3b\u7ebf\u7a0b\u8c03\u7528\uff0c\u5426\u5219\u629b\u51fa\u5f02\u5e38\n        enforceMainThreadIfNeeded(\"setCurrentState\")}\n        \/\/ \u5c06\u751f\u547d\u5468\u671f\u79fb\u52a8\u5230\u7ed9\u5b9astate\u5e76\u5c06\u5fc5\u8981\u7684\u4e8b\u4ef6\u53d1\u9001\u7ed9\u89c2\u5bdf\u8005\u3002\n        moveToState(state)\n    }\n<\/code><\/pre>\n
              getCurrentState()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u83b7\u53d6\u5230\u5f53\u524d\u7684\u72b6\u6001<\/strong>\u3002setCurrentState()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u8bbe\u7f6e\u5f53\u524d\u7684\u72b6\u6001\uff08\u5c06\u72b6\u6001\u79fb\u52a8\u5230\u7ed9\u5b9a\u503c\uff09\u3002<\/p>\n
              currentStateFlow<\/h3>\n
              LifecycleRegistry –> currentStateFlow<\/strong><\/p>\n
              private val _currentStateFlow: MutableStateFlow<State> = MutableStateFlow(State.INITIALIZED)\noverride val currentStateFlow: StateFlow<State>\n    get() = _currentStateFlow.asStateFlow()\n<\/code><\/pre>\n
              getCurrentStateFlow()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u83b7\u53d6\u5230\u5f53\u524d\u72b6\u6001<\/strong>\u7684Flow<\/code>\uff0c_currentStateFlow<\/code>\u4f1a\u5728sync()<\/code>\u65b9\u6cd5\u65f6\u8bb0\u5f55\u5f53\u524d\u72b6\u6001\u3002<\/p>\n
              \u83b7\u53d6\u5f53\u524dEvent<\/h2>\n
              public val Lifecycle.eventFlow: Flow<Lifecycle.Event>\n    get() = callbackFlow {\n        val observer = LifecycleEventObserver { _, event ->\n            trySend(event)\n        }.also { addObserver(it) } \/\/ \u901a\u8fc7addObserver()\u6765\u89c2\u5bdf\uff0c\u83b7\u53d6\u5f53\u524dEvent\u3002\n\n        awaitClose { removeObserver(observer) }\n    }.flowOn(Dispatchers.Main.immediate)\n<\/code><\/pre>\n
              getEventFlow()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u83b7\u53d6\u5230\u5f53\u524d\u4e8b\u4ef6<\/strong>\u7684Flow<\/code>\uff0c\u5185\u90e8\u4f7f\u7528addObserver()<\/code>\u6765\u89c2\u5bdf\u83b7\u53d6\u5f53\u524dEvent<\/code>\u3002<\/p>\n
              \u6b64\u72b6\u6001\u662f\u5982\u4f55\u88ab\u901a\u77e5\u7684\uff0c\u5b83\u53c8\u662f\u5982\u4f55\u611f\u77e5\u751f\u547d\u5468\u671f\u7684\uff0c\u6211\u4eec\u4e00\u8d77\u770b\u751f\u547d\u5468\u671f\u611f\u77e5<\/strong>\u3002<\/p>\n
              \u751f\u547d\u5468\u671f\u611f\u77e5<\/h2>\n
              Lifecycle<\/code>\u662f\u4e00\u4e2a\u751f\u547d\u5468\u671f\u611f\u77e5\u7684\u6846\u67b6\uff0c\u90a3\u4e48\u5b83\u662f\u5982\u4f55\u611f\u77e5Activity<\/code>\u6216Fragment<\/code>\u7684\u751f\u547d\u5468\u671f\u7684\u5462\uff1f<\/p>\n
              Activity<\/h3>\n
              \n  \u8bf4\u660e\uff1aMyActivity<\/code>\u7ee7\u627f\u5173\u7cfb\uff1aMyActivity<\/code>->AppCompatActivity<\/code>->FragmentActivity<\/code>->androidx.activity.ComponentActivity<\/code>->androidx.core.app.ComponentActivity<\/code>\n<\/p><\/blockquote>\n
              androidx.activity.ComponentActivity–> onCreate\u65b9\u6cd5<\/strong><\/p>\n
              override fun onCreate(savedInstanceState: Bundle?) {\n    ...\n    super.onCreate(savedInstanceState)\n    \/\/ \u4f7f\u7528ReportFragment\u5206\u53d1\u4e8b\u4ef6\n    ReportFragment.injectIfNeededIn(this)\n    if (contentLayoutId != 0) {\n        setContentView(contentLayoutId)\n    }\n}\n<\/code><\/pre>\n
              androidx.core.app.ComponentActivity–> onCreate\u65b9\u6cd5<\/strong><\/p>\n
              override fun onCreate(savedInstanceState: Bundle?) {\n    super.onCreate(savedInstanceState)\n    \/\/ \u4f7f\u7528ReportFragment\u5206\u53d1\u4e8b\u4ef6\n    ReportFragment.injectIfNeededIn(this)\n}\n<\/code><\/pre>\n
              androidx.activity.ComponentActivity<\/code>\u3001\u5b83\u7684\u7236\u7c7bandroidx.core.app.ComponentActivity<\/code>\u90fd\u8c03\u7528\u4e86ReportFragment.injectIfNeededIn(this)<\/code>\uff0c\u8ba9\u5176\u5904\u7406\u5f53\u524dActivity<\/code>\u7684\u4e8b\u4ef6\u5206\u53d1\u3002<\/p>\n
              \n  \u95ee\u9898\uff1a<\/p>\n
                \n
              1. \u4e3a\u4ec0\u4e48\u5728androidx.activity.ComponentActivity<\/code>\u5185\u8c03\u7528\u4e86\uff0c\u8fd8\u8981\u5728\u5176\u7236\u7c7bandroidx.core.app.ComponentActivity<\/code>\u5185\u8c03\u7528\uff1f\n
                  \n
                • \u56e0\u4e3aMyActivity<\/code>\u53ef\u80fd\u76f4\u63a5\u7ee7\u627f\u7684\u662f\u7236\u7c7bandroidx.core.app.ComponentActivity<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n
                • \u4e0a\u9762\u95ee\u9898\uff0c\u4f1a\u5bfc\u81f4\u540c\u4e00\u4e2aActivity<\/code>\u8c03\u7528\u4e86\u591a\u6b21\uff0c\u90a3addObserver<\/code>\u589e\u52a0\u7684\u89c2\u5bdf\u8005\u4f1a\u4e0d\u4f1a\u540c\u4e00\u4e2a\u72b6\u6001\u88ab\u901a\u77e5\u591a\u6b21\uff1f\n
                    \n
                  • \u4e0d\u4f1a\uff0c\u56e0\u4e3a\u5728LifecycleRegistry<\/code>\u5206\u53d1\u7684\u65f6\u5019\uff0c\u5224\u65ad\u4e86\uff0c\u5982\u679c\u8981\u5206\u53d1\u7684\u72b6\u6001<\/strong>\u548c\u5f53\u524d\u7684\u72b6\u6001<\/strong>\u76f8\u540c\uff0c\u5219\u4e0d\u64cd\u4f5c\u76f4\u63a5\u8fd4\u56de\uff0c\u6240\u4ee5\u4e0d\u4f1a\u88ab\u88ab\u901a\u77e5\u591a\u6b21\u3002<\/li>\n<\/ul>\n<\/li>\n
                  • \u4e3a\u4ec0\u4e48\u8981\u7528Fragment<\/code>\u6765\u5b9e\u73b0Activity<\/code>\u7684\u4e8b\u4ef6\u5206\u53d1\uff1f\n
                      \n
                    • \u56e0\u4e3aFragment<\/code>\u80fd\u611f\u77e5\u751f\u547d\u5468\u671f\u53d8\u5316\uff0c\u5e76\u4e14Fragment<\/code>\u597d\u5728Activity<\/code>\u4e2d\u8fdb\u884c\u589e\u5220\uff0c\u4f8b\u5982MyActivity<\/code>\u76f4\u63a5\u7ee7\u627fActivity<\/code>\uff0c\u60f3\u8981\u6b64\u529f\u80fd\uff0c\u76f4\u63a5\u5728onCreate<\/code>\u65b9\u6cd5\u5185\u8c03\u7528ReportFragment.injectIfNeededIn(this)<\/code>\u5373\u53ef\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/blockquote>\n
                      \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0bReportFragment<\/code>\u7684injectIfNeededIn()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                      ReportFragment–> injectIfNeededIn\u65b9\u6cd5<\/strong><\/p>\n
                      public companion object {\n    private const val REPORT_FRAGMENT_TAG =\n        \"androidx.lifecycle.LifecycleDispatcher.report_fragment_tag\"\n\n    @JvmStatic\n    public fun injectIfNeededIn(activity: Activity) {\n        if (Build.VERSION.SDK_INT >= 29) {\n            \/\/ 29\u53ca\u4ee5\u4e0a\uff0c\u76f4\u63a5\u5411Activity\u6ce8\u518cActivityLifecycleCallbacks\u3002\n            LifecycleCallbacks.registerIn(activity)\n        }       \n        \/\/ \u6dfb\u52a0\u65e0\u5e03\u5c40\u7684Fragment\uff0c\u5982\u679c\u4e4b\u524d\u5df2\u7ecf\u6dfb\u52a0\uff0c\u5219\u4e0d\u518d\u6dfb\u52a0\u3002\n        val manager = activity.fragmentManager\n        if (manager.findFragmentByTag(REPORT_FRAGMENT_TAG) == null) {\n            manager.beginTransaction().add(ReportFragment(), REPORT_FRAGMENT_TAG).commit()\n            \/\/ Hopefully, we are the first to make a transaction.\n            manager.executePendingTransactions()\n        }\n    }\n}\n<\/code><\/pre>\n
                      SDK >= 29<\/h4>\n
                      internal class LifecycleCallbacks : Application.ActivityLifecycleCallbacks {\n    override fun onActivityCreated(\n        activity: Activity,\n        bundle: Bundle?\n    ) {}\n\n    override fun onActivityPostCreated(\n        activity: Activity,\n        savedInstanceState: Bundle?\n    ) {\n        dispatch(activity, Lifecycle.Event.ON_CREATE)\n    }\n\n    override fun onActivityStarted(activity: Activity) {}\n\n    override fun onActivityPostStarted(activity: Activity) {\n        dispatch(activity, Lifecycle.Event.ON_START)\n    }\n\n    override fun onActivityResumed(activity: Activity) {}\n\n    override fun onActivityPostResumed(activity: Activity) {\n        dispatch(activity, Lifecycle.Event.ON_RESUME)\n    }\n\n    override fun onActivityPrePaused(activity: Activity) {\n        dispatch(activity, Lifecycle.Event.ON_PAUSE)\n    }\n\n    override fun onActivityPaused(activity: Activity) {}\n\n    override fun onActivityPreStopped(activity: Activity) {\n        dispatch(activity, Lifecycle.Event.ON_STOP)\n    }\n\n    override fun onActivityStopped(activity: Activity) {}\n\n    override fun onActivitySaveInstanceState(\n        activity: Activity,\n        bundle: Bundle\n    ) {}\n\n    override fun onActivityPreDestroyed(activity: Activity) {\n        dispatch(activity, Lifecycle.Event.ON_DESTROY)\n    }\n\n    override fun onActivityDestroyed(activity: Activity) {}\n\n    companion object {\n        @JvmStatic\n        fun registerIn(activity: Activity) {\n            activity.registerActivityLifecycleCallbacks(LifecycleCallbacks())\n        }\n    }\n}\n<\/code><\/pre>\n
                      SDK >= 29<\/strong>\uff0c Activity<\/code>\u4f1a\u6ce8\u518c\u4e00\u4e2aActivityLifecycleCallbacks<\/code>\u76d1\u542c\u6b64Activity<\/code>\u7684\u751f\u547d\u5468\u671f\u53d8\u5316\uff0c\u4f1a\u5728onCreate<\/code>\u3001onStart<\/code>\u3001onResume<\/code> \u65b9\u6cd5\u88ab\u8c03\u7528\u540e<\/strong>\uff0c onPause<\/code>\u3001onStop<\/code>\u3001onDestroy<\/code> \u65b9\u6cd5\u88ab\u8c03\u7528\u524d<\/strong>\u5206\u53d1\u5bf9\u5e94\u7684 Event<\/code>\u3002\u540c\u4e00\u4e2aActivity<\/code>\u53ef\u80fd\u4f1a\u6ce8\u518c\u591a\u4e2aActivityLifecycleCallbacks<\/code>\uff0c\u5219\u540c\u4e00\u4e2a\u72b6\u6001\u4f1a\u8c03\u7528dispatch(Activity, Lifecycle.Event)<\/code>\u591a\u6b21\u3002<\/p>\n
                      \u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u4e00\u4e0b\uff0c\u4e0a\u9762\u8c03\u7528\u7684dispatch()<\/code>\u7684\u5b9e\u73b0\u3002<\/p>\n
                      ReportFragment–> dispatch(Activity, Lifecycle.Event)\u65b9\u6cd5<\/strong><\/p>\n
                      @JvmStatic\ninternal fun dispatch(activity: Activity, event: Lifecycle.Event) {\n    \/\/ LifecycleRegistryOwner\u5df2\u88ab\u5f03\u7528\n    if (activity is LifecycleRegistryOwner) {\n        activity.lifecycle.handleLifecycleEvent(event)\n        return\n    }\n    \/\/ ComponentActivity\u5df2\u7ecf\u5b9e\u73b0LifecycleOwner\uff0c\u5e76lifecycle\u8fd4\u56de\u7684\u662fLifecycleRegistry\u3002\n    if (activity is LifecycleOwner) {\n        val lifecycle = (activity as LifecycleOwner).lifecycle\n        if (lifecycle is LifecycleRegistry) {\n            lifecycle.handleLifecycleEvent(event)\n        }\n    }\n}\n<\/code><\/pre>\n
                      \u7531\u4e8eComponentActivity<\/code>\u5df2\u7ecf\u5b9e\u73b0LifecycleOwner<\/code>\uff0c\u5e76lifecycle<\/code>\u8fd4\u56de\u7684\u662fLifecycleRegistry<\/code>\uff0c\u6240\u4ee5\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e00\u4e0bLifecycleRegistry<\/code>\u7684handleLifecycleEvent()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                      LifecycleRegistry–> handleLifecycleEvent()\u65b9\u6cd5<\/strong><\/p>\n
                      public actual open fun handleLifecycleEvent(event: Event) {\n    \/\/ \u5f53enforceMainThread\u4e3atrue\u65f6\uff0c\u5fc5\u987b\u662f\u5728\u4e3b\u7ebf\u7a0b\u8c03\u7528\uff0c\u5426\u5219\u629b\u51fa\u5f02\u5e38\n    enforceMainThreadIfNeeded(\"handleLifecycleEvent\")\n    moveToState(event.targetState)\n}\n\nprivate fun moveToState(next: State) {\n    if (state == next) {\n        \/\/ \u5982\u679c\u8981\u8bbe\u7f6e\u7684\u72b6\u6001\u548c\u5f53\u524d\u7684\u72b6\u6001\u76f8\u540c\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\n        return\n    }\n    check(!(state == State.INITIALIZED && next == State.DESTROYED)) {\n        \"State must be at least CREATED to move to $next, but was $state in component \" +\n            \"${lifecycleOwner.get()}\"\n    }\n    \/\/ \u8bb0\u5f55\u5f53\u524d\u72b6\u6001\n    state = next\n    if (handlingEvent || addingObserverCounter != 0) {\n        newEventOccurred = true\n        \/\/ we will figure out what to do on upper level.\n        return\n    }\n    handlingEvent = true\n    \/\/ \u540c\u6b65\n    sync()\n    handlingEvent = false\n    if (state == State.DESTROYED) {\n        observerMap = FastSafeIterableMap()\n    }\n}\n<\/code><\/pre>\n
                      \u7531\u4e8emoveToState()<\/code>\u5224\u65ad\u4e86\u540c\u72b6\u6001\u4e0d\u5904\u7406<\/strong>\uff0c\u6240\u4ee5\u540c\u4e00\u4e2a\u4e8b\u4ef6\u591a\u6b21\u8c03\u7528handleLifecycleEvent<\/code>\u4e5f\u4e0d\u4f1a\u6709\u95ee\u9898\u3002<\/p>\n
                      \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0bsync()<\/code>\u65b9\u6cd5\u3002<\/p>\n
                      LifecycleRegistry–> sync()\u65b9\u6cd5<\/strong><\/p>\n
                      private fun sync() {\n    val lifecycleOwner = lifecycleOwner.get()\n        ?: throw IllegalStateException(\n            \"LifecycleOwner of this LifecycleRegistry is already \" +\n                \"garbage collected. It is too late to change lifecycle state.\"\n        )\n    \/\/ \u53ea\u8981\u672a\u540c\u6b65\uff0c\u5c31\u4e00\u76f4\u540c\u6b65\u3002\u4e0d\u7528if\u7528while\u7684\u539f\u56e0\uff0c\u56e0\u4e3a\u540c\u6b65\u8fc7\u7a0b\u4e2d\u72b6\u6001\u53ef\u80fd\u6539\u53d8\u4e86\u3002\n    while (!isSynced) {\n        newEventOccurred = false\n        if (state < observerMap.eldest()!!.value.state) {\n            \/\/ \u5c0f\u4e8e\u5f53\u524dState\uff0c\u8c03\u7528backwardPass\u5411\u540e\u3002\n            backwardPass(lifecycleOwner)\n        }\n        val newest = observerMap.newest()\n        if (!newEventOccurred && newest != null && state > newest.value.state) {\n            \/\/ \u5927\u4e8e\u5f53\u524dState\uff0c\u8c03\u7528forwardPass\u5411\u524d\u3002\n            forwardPass(lifecycleOwner)\n        }\n    }\n    newEventOccurred = false\n    \/\/ \u8bb0\u5f55\u5f53\u524d\u72b6\u6001\n    _currentStateFlow.value = currentState\n}\n<\/code><\/pre>\n
                      backwardPass()<\/code>\u548cforwardPass()<\/code>\u7c7b\u4f3c\uff0c\u6211\u4eec\u53ea\u770b\u4e00\u4e2aforwardPass()<\/code>\u3002<\/p>\n
                      LifecycleRegistry–> forwardPass()\u65b9\u6cd5<\/strong><\/p>\n
                      private fun forwardPass(lifecycleOwner: LifecycleOwner) {\n    @Suppress()\n    val ascendingIterator: Iterator<Map.Entry<LifecycleObserver, ObserverWithState>> =\n        observerMap.iteratorWithAdditions()\n    \/\/ \u904d\u5386\u6240\u6709\u7684\u89c2\u5bdf\u8005\n    while (ascendingIterator.hasNext() && !newEventOccurred) {\n        val (key, observer) = ascendingIterator.next()\n        \/\/ \u4f9d\u6b21\u540c\u6b65\u6240\u6709\u7684\u72b6\u6001\n        while (observer.state < state && !newEventOccurred && observerMap.contains(key)\n        ) {\n            pushParentState(observer.state)\n            val event = Event.upFrom(observer.state)\n                ?: throw IllegalStateException(\"no event up from ${observer.state}\")\n            \/\/ \u89c2\u5bdf\u8005ObserverWithState\u5206\u53d1\u4e8b\u4ef6\uff0c\u901a\u77e5\u88abLifecycle\u6dfb\u52a0\u7684LifecycleObserver\u72b6\u6001\u6539\u53d8\u3002\n            observer.dispatchEvent(lifecycleOwner, event)\n            popParentState()\n        }\n    }\n}\n<\/code><\/pre>\n
                      forwardPass()<\/code>\u5206\u53d1\uff0c\u75282\u4e2awhile<\/code>\u7684\u539f\u56e0\uff0c\u7b2c\u4e00\u4e2awhile<\/code>\u7528\u4e8e\u904d\u5386\u6240\u6709\u7684\u89c2\u5bdf\u8005<\/strong>\uff0c\u7b2c\u4e8c\u4e2awhile<\/code>\u7528\u4e8e\u8ba9\u5f53\u524d\u89c2\u5bdf\u8005\u63a5\u6536\u6240\u6709\u7684\u4e8b\u4ef6<\/strong>\u3002<\/p>\n
                      SDK < 29<\/h4>\n
                      ReportFragment–> \u751f\u547d\u5468\u671f\u65b9\u6cd5<\/strong><\/p>\n
                      public open class ReportFragment() : android.app.Fragment() {\n    private var processListener: ActivityInitializationListener? = null\n\n    private fun dispatchCreate(listener: ActivityInitializationListener?) {\n        listener?.onCreate()\n    }\n\n    private fun dispatchStart(listener: ActivityInitializationListener?) {\n        listener?.onStart()\n    }\n\n    private fun dispatchResume(listener: ActivityInitializationListener?) {\n        listener?.onResume()\n    }\n\n    override fun onActivityCreated(savedInstanceState: Bundle?) {\n        super.onActivityCreated(savedInstanceState)\n        dispatchCreate(processListener)\n        dispatch(Lifecycle.Event.ON_CREATE)\n    }\n\n    override fun onStart() {\n        super.onStart()\n        dispatchStart(processListener)\n        dispatch(Lifecycle.Event.ON_START)\n    }\n\n    override fun onResume() {\n        super.onResume()\n        dispatchResume(processListener)\n        dispatch(Lifecycle.Event.ON_RESUME)\n    }\n\n    override fun onPause() {\n        super.onPause()\n        dispatch(Lifecycle.Event.ON_PAUSE)\n    }\n\n    override fun onStop() {\n        super.onStop()\n        dispatch(Lifecycle.Event.ON_STOP)\n    }\n\n    override fun onDestroy() {\n        super.onDestroy()\n        dispatch(Lifecycle.Event.ON_DESTROY)\n        \/\/ just want to be sure that we won't leak reference to an activity\n        processListener = null\n    }\n\n    private fun dispatch(event: Lifecycle.Event) {\n        if (Build.VERSION.SDK_INT < 29) {\n            \/\/ \u4ec5\u5728API-29\u4e4b\u524d\u7684\u7248\u672c\uff0c\u4eceReportFragment\u8c03\u5ea6\u4e8b\u4ef6\u3002\n            \/\/ \u5728API-29\u53ca\u4e4b\u540e\u7684\u7248\u672c\uff0c\u8fd9\u7531ReportFragment.injectIfNeededIn\u4e2d\u6dfb\u52a0\u7684ActivityLifecycleCallbacks\u5904\u7406\u3002\n            dispatch(activity, event)\n        }\n    }\n\n    public fun setProcessListener(processListener: ActivityInitializationListener?) {\n        this.processListener = processListener\n    }\n}\n<\/code><\/pre>\n
                      Activity<\/code>\u4f1a\u6dfb\u52a0\u4e00\u4e2a\u65e0\u5e03\u5c40\u7684ReportFragment<\/code>\u6765\u76d1\u542c\u6b64Activity<\/code>\u7684\u751f\u547d\u5468\u671f\u53d8\u5316\uff0c\u4f1a\u5728\u5bf9\u5e94\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5<\/strong>\u91cc\u5206\u53d1\u5bf9\u5e94\u7684 Event<\/code>\u3002\u540c\u4e00\u4e2aActivity<\/code>\u4e0d\u4f1a\u6dfb\u52a0\u591a\u4e2aReportFragment<\/code>\uff0c\u6240\u4ee5\u540c\u4e00\u4e2a<\/strong>\u4e8b\u4ef6\u4e0d\u4f1a\u8c03\u7528\u591a\u6b21<\/strong>dispatch( Lifecycle.Event)<\/code>\u3002<\/p>\n
                      \u7531\u4e8eReportFragment<\/code>\uff0c\u5728SDK\u6240\u6709\u7248\u672c<\/strong>\u90fd\u6709\u6dfb\u52a0\uff0c\u800c\u5728SDK >= 29<\/strong>\u7684\u65f6\u5019\u662f\u4f7f\u7528ActivityLifecycleCallbacks<\/code>\u5904\u7406\u7684\u5206\u53d1\uff0c\u6240\u4ee5ReportFragment<\/code>\u7684\u5206\u53d1\u9700\u8981\u5728SDK < 29<\/strong>\u4e0b\uff0c\u9632\u6b62\u91cd\u590d\u3002<\/p>\n
                      Fragment<\/h3>\n
                      androidx.fragment.app.Fragment–> \u751f\u547d\u5468\u671f\u65b9\u6cd5<\/strong><\/p>\n
                      public class Fragment implements ComponentCallbacks, OnCreateContextMenuListener, LifecycleOwner,\n        ViewModelStoreOwner, HasDefaultViewModelProviderFactory, SavedStateRegistryOwner,\n        ActivityResultCaller {\n\n    void performCreate(Bundle savedInstanceState) {\n        ...\n        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE);\n    }\n\n    @SuppressWarnings(\"ConstantConditions\")\n    void performStart() {\n        ...\n        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START);\n        ...\n    }\n\n    @SuppressWarnings(\"ConstantConditions\")\n    void performResume() {\n        ...\n        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_RESUME);\n        ...\n    }\n\n    @SuppressWarnings(\"ConstantConditions\")\n    void performPause() {\n        ...\n        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_PAUSE);\n        ...\n    }\n\n    void performStop() {\n        ...\n        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_STOP);\n        ...\n    }\n\n    void performDestroy() {\n        ...\n        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_DESTROY);\n        ...\n    }\n<\/code><\/pre>\n
                      androidx.fragment.app.Fragment<\/code>\u7684\u5b9e\u73b0\uff0c\u662f\u76f4\u63a5\u5176\u751f\u547d\u5468\u671f\u65b9\u6cd5\u5185\u8c03\u7528\u7684handleLifecycleEvent()<\/code>\u65b9\u6cd5\u8fdb\u884c\u7684\u5206\u53d1\u3002<\/p>\n
                      \u5c0f\u7ed3<\/h3>\n
                      \n  \u4ee3\u7801\u6d41\u7a0b\uff1a
                      \n  1. androidx<\/code>\u7684Activity<\/code>\uff0c\u5728\u5176SDK >= 29<\/strong>\u7684\u65f6\u5019\u662f\u4f7f\u7528ActivityLifecycleCallbacks<\/code>\u8fdb\u884c\u7684\u5206\u53d1\uff0c\u5728SDK < 29<\/strong>\u7684\u65f6\u5019\u662f\u4f7f\u7528ReportFragment<\/code>\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5<\/strong>\u8fdb\u884c\u7684\u5206\u53d1\u3002
                      \n  2. androidx<\/code>\u7684Fragment<\/code>\uff0c\u662f\u4f7f\u7528androidx Fragment<\/code>\u7684\u751f\u547d\u5468\u671f\u65b9\u6cd5<\/strong>\u8fdb\u884c\u7684\u5206\u53d1\u3002
                      \n  3. \u5206\u53d1<\/strong>\u4f1a\u8c03\u7528LifecycleRegistry<\/code>\u7c7bhandleLifecycleEvent()<\/code>\u65b9\u6cd5\u5206\u53d1\uff0c\u5982\u679c\u5f53\u524d\u7684\u72b6\u6001<\/strong>\u548c\u8981\u5206\u53d1\u7684\u72b6\u6001<\/strong>\u76f8\u540c\uff0c\u5219\u4e0d\u5904\u7406\uff1b\u5426\u5219\u5b83\u4f1a\u904d\u5386\u6240\u6709\u7684\u89c2\u5bdf\u8005<\/strong>\uff0c\u5e76\u8ba9\u6bcf\u4e2a\u89c2\u5bdf\u8005\u4f9d\u6b21\u63a5\u6536\u5230\u6240\u6709\u7684\u4e8b\u4ef6<\/strong>\u3002\n<\/p><\/blockquote>\n
                      \u603b\u7ed3<\/h1>\n
                      \u4ee5\u4e0a\u5c31\u662f\u5168\u9762\u7684Jetpack-Lifecycle<\/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":"
                      Lifecycle\u6e90\u7801\u89e3\u6790 \u6e90\u7801\u7248\u672c\uff1a * Lifecycle\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":[22,26,20],"class_list":["post-95","post","type-post","status-publish","format-standard","hentry","category-source-jetpack","category-source","tag-jetpack","tag-lifecycle","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\/95","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=95"}],"version-history":[{"count":8,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/95\/revisions"}],"predecessor-version":[{"id":236,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/95\/revisions\/236"}],"wp:attachment":[{"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=95"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=95"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=95"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}