{"id":129,"date":"2022-04-17T12:56:23","date_gmt":"2022-04-17T12:56:23","guid":{"rendered":"http:\/\/www.devblog.cn\/?p=129"},"modified":"2025-03-03T17:54:05","modified_gmt":"2025-03-03T09:54:05","slug":"129","status":"publish","type":"post","link":"http:\/\/www.devblog.cn\/?p=129","title":{"rendered":"Android-Handler\u6e90\u7801\u89e3\u6790-Handler\uff08\u4e00\uff09"},"content":{"rendered":"<h1>Android-Handler\u6e90\u7801\u89e3\u6790-Handler\uff08\u4e00\uff09<\/h1>\n<blockquote><p>\n  \u6e90\u7801\u7248\u672c\uff1a<br \/>\n  * <strong>Handler<\/strong>\uff1aSDK-35<br \/>\n  * <strong>\u66f4\u65b0\u65f6\u95f4<\/strong>\uff1a2025-3\u6708<\/p>\n<p>  <strong>\u5bfc\u822a\uff1a<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/juejin.cn\/post\/7475656733558652943\">Android-Handler\u6e90\u7801\u89e3\u6790-\u4f7f\u7528<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085976728538972190\">Android-Handler\u6e90\u7801\u89e3\u6790-Handler\uff08\u4e00\uff09<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085976341056585742\">Android-Handler\u6e90\u7801\u89e3\u6790-Looper\uff08\u4e8c\uff09<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085977128092565512\">Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue\uff08\u4e09\uff09<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085975951414132766\">Android-Handler\u6e90\u7801\u89e3\u6790-Message\uff08\u56db\uff09<\/a><\/li>\n<li>\u66f4\u591a\u7684\u6587\u7ae0\u770b\u8fd9\u91cc\uff1a<a href=\"https:\/\/juejin.cn\/user\/4450479132652679\/posts\">\u4e3b\u9875<\/a><\/li>\n<\/ul>\n<\/blockquote>\n<h2>\u6210\u5458\u53d8\u91cf<\/h2>\n<pre><code class=\"language-java\">\/\/ \u662f\u5426\u53d1\u73b0(\u68c0\u67e5)\u6f5c\u5728\u7684\u6cc4\u6f0f\nprivate static final boolean FIND_POTENTIAL_LEAKS = false;\n\/\/ Log\u7684Tag\nprivate static final String TAG = \"Handler\";\n\/\/ \u4e3b\u7ebf\u7a0bHandler\nprivate static Handler MAIN_THREAD_HANDLER = null;\n\n\/\/ \u6b64Handler\u7684Looper\n@UnsupportedAppUsage\nfinal Looper mLooper;\n\n\/\/ \u6b64Handler\u7684\u6d88\u606f\u961f\u5217\uff0c\u6765\u81eaLooper\u5bf9\u8c61\u3002\nfinal MessageQueue mQueue;\n\n\/\/ \u6b64Handler\u5206\u53d1\u6d88\u606f\u65f6\uff0c\u5728\u5904\u7406\u975eRunnable\u6d88\u606f\u65f6\uff0c\u4f18\u5148\u5904\u7406Message\u7684Callback\uff0c\u5176\u6b21\u518dhandleMessage()\u5904\u7406\u3002\n@UnsupportedAppUsage\nfinal Callback mCallback;\n\n\/\/ \u662f\u5426\u662f\u5f02\u6b65Handler\uff0c\u5373\u662f\u5426send\u6216post\u7684\u6d88\u606f\u5168\u90e8\u90fd\u662f\u5f02\u6b65\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3afalse\u3002\nfinal boolean mAsynchronous;\n\n\/\/ \u8de8\u8fdb\u7a0b\u901a\u4fe1\uff0c\u6d88\u606f\u53d1\u9001\u8005\u3002\n@UnsupportedAppUsage\nIMessenger mMessenger;\n\n\/\/ \u5982\u679c\u662f\u5171\u4eabHandler\uff0c\u5219\u4e0d\u5141\u8bb8\u67d0\u4e9b\u5371\u9669\u64cd\u4f5c\u3002\nprivate final boolean mIsShared;\n<\/code><\/pre>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Looper<\/code>\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976341056585742\">Android-Handler\u6e90\u7801\u89e3\u6790-Looper<\/a>\u3002<br \/>\n  2. <code>MessageQueue<\/code>\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085977128092565512\">Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue<\/a>\u3002<br \/>\n  3. <code>Handler<\/code>\u4e3a\u4ec0\u4e48\u9700\u8981\u6301\u6709<code>Looper<\/code>\u3001<code>MessageQueue<\/code>\uff0c\u56e0\u4e3a<code>Handler<\/code><strong>\u53d1\u9001\u6d88\u606f\u7b49<\/strong>\u64cd\u4f5c\u9700\u8981\u77e5\u9053<strong>\u53d1\u9001\u5230\u54ea\u4e2a<\/strong><code>MessageQueue<\/code>\uff0c\u800c<code>MessageQueue<\/code>\u9700\u8981\u4ece<code>Looper<\/code>\u4e2d\u83b7\u53d6\uff0c\u4ee5\u4fbf<strong>\u53d1\u51fa\u7684\u6d88\u606f<\/strong>\u80fd\u8fdb\u884c<strong>\u8f6e\u8be2\u5206\u53d1<\/strong> \u3002\n<\/p><\/blockquote>\n<h2>\u521b\u5efaHandler<\/h2>\n<p>\u60f3\u8981<strong>\u4f7f\u7528<\/strong><code>Handler<\/code>\uff0c\u9996\u5148\u8981<strong>\u521b\u5efa<\/strong><code>Handler<\/code>\uff0c\u6240\u4ee5\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0b\u5b83\u662f\u5982\u4f55\u88ab<strong>\u521b\u5efa<\/strong>\u7684\u3002<\/p>\n<h3>new Handler()<\/h3>\n<h4>\u9ed8\u8ba4Looper<\/h4>\n<p><strong>Handler()<\/strong><\/p>\n<pre><code class=\"language-java\">@Deprecated\npublic Handler() {\n    this(null, false);\n}\n<\/code><\/pre>\n<p><strong>Handler(Callback)<\/strong><\/p>\n<pre><code class=\"language-java\">@Deprecated\npublic Handler(@Nullable Callback callback) {\n    this(callback, false);\n}    \n<\/code><\/pre>\n<p><strong>Handler(boolean)<\/strong><\/p>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic Handler(boolean async) {\n    this(null, async);\n}\n<\/code><\/pre>\n<p><strong>Handler(Callback, boolean)<\/strong><\/p>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic Handler(@Nullable Callback callback, boolean async) {\n    if (FIND_POTENTIAL_LEAKS) {\n        \/\/ \u68c0\u67e5\u6f5c\u5728\u7684\u6cc4\u6f0f\uff0c\u4e3afalse\u4e0d\u68c0\u67e5\u3002\n        final Class&lt;? extends Handler&gt; klass = getClass();\n        if ((klass.isAnonymousClass() || klass.isMemberClass() || klass.isLocalClass()) &amp;&amp;\n                (klass.getModifiers() &amp; Modifier.STATIC) == 0) {\n            \/\/ \u533f\u540d\u7c7b\u3001\u6210\u5458\u7c7b\u3001\u5c40\u90e8\u7c7b\uff0c\u5e76\u4e14\u4e0d\u662f\u9759\u6001\u7684\uff0c\u8b66\u544a\u63d0\u793a\uff08\u4ee5\u4e0bHandler\u7c7b\u5e94\u8be5\u662f\u9759\u6001\u7684\uff0c\u5426\u5219\u53ef\u80fd\u4f1a\u53d1\u751f\u6cc4\u6f0f\uff09\u3002\n            Log.w(TAG, \"The following Handler class should be static or leaks might occur: \" +\n                klass.getCanonicalName());\n        }\n    }\n\n    \/\/ \u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\u7684Looper\n    mLooper = Looper.myLooper();\n    if (mLooper == null) {\n        \/\/ \u5f53\u524d\u7ebf\u7a0b\u6ca1\u6709Looper\uff0c\u5219\u629b\u51fa\u5f02\u5e38\u63d0\u793a\uff08\u4e0d\u80fd\u5728\u6ca1\u6709\u8c03\u7528Looper.prepare()\u7684\u7ebf\u7a0b\u4e2d\u521b\u5efahandler\uff09\u3002\n        throw new RuntimeException(\n            \"Can't create handler inside thread \" + Thread.currentThread()\n                    + \" that has not called Looper.prepare()\");\n    }\n    \/\/ \u83b7\u53d6Looper\u7684\u6d88\u606f\u961f\u5217\n    mQueue = mLooper.mQueue;\n    \/\/ \u8bb0\u5f55CallBack\n    mCallback = callback;\n    \/\/ \u8bb0\u5f55\u662f\u5426\u662f\u5f02\u6b65\u7684\n    mAsynchronous = async;\n    \/\/ \u5982\u679c\u662f\u5171\u4eabHandler\uff0c\u5219\u4e0d\u5141\u8bb8\u67d0\u4e9b\u5371\u9669\u64cd\u4f5c\u3002\n    mIsShared = false;\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a<strong>\u6784\u9020\u65b9\u6cd5<\/strong>\uff0c\u4f7f\u7528<strong>\u9ed8\u8ba4<\/strong>\u7684<code>Looper<\/code>\uff08<strong>\u5f53\u524d\u7ebf\u7a0b<\/strong>\u7684<code>Looper<\/code>\uff09\u3002\u5982\u679c\u8fd9\u4e2a<strong>\u7ebf\u7a0b<\/strong>\u6ca1\u6709<code>looper<\/code>\uff0c\u5219<strong>\u629b\u51fa\u5f02\u5e38<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Handler()<\/code>\u3001<code>Handler(Callback)<\/code>\u4e24\u4e2a\u6784\u9020\u65b9\u6cd5<strong>\u5df2\u7ecf\u88ab\u6807\u8bb0<\/strong>\u4e3a<code>@Deprecated<\/code>\uff08\u8fc7\u65f6\uff09\uff0c\u56e0\u4e3a\u5728<code>Handler<\/code>\u6784\u9020\u8fc7\u7a0b\u4e2d\u9009\u62e9\u4e00\u4e2a<strong>\u9ed8\u8ba4<\/strong>\u7684<code>Looper<\/code>\u53ef\u80fd\u4f1a\u5bfc\u81f4<strong>\u5d29\u6e83<\/strong>\uff08\u5728<strong>\u8fd9\u4e2a\u7ebf\u7a0b<\/strong>\u4e0a<strong>\u6ca1\u6709\u8c03\u7528<\/strong><code>Looper.prepare()<\/code>\uff09\uff0c<strong>\u63a8\u8350<\/strong>\u4f7f\u7528<strong>\u6307\u5b9aLooper<\/strong>\u7684\u6784\u9020\u65b9\u6cd5\u3002<br \/>\n  2. <code>Handler(boolean)<\/code>\u3001<code>Handler(Callback, boolean)<\/code>\u4e24\u4e2a\u6784\u9020\u65b9\u6cd5\u5df2\u7ecf\u88ab\u6807\u8bb0\u4e3a<code>@hide<\/code>\uff08\u9690\u85cf\uff09\uff0c\u53ea\u80fd<strong>\u7cfb\u7edf\u5185\u90e8<\/strong>\u4f7f\u7528\u3002<br \/>\n  3. \u4f7f\u7528<strong>\u9ed8\u8ba4<\/strong>\u7684<code>Looper<\/code>\uff08<strong>\u5f53\u524d\u7ebf\u7a0b<\/strong>\u7684<code>Looper<\/code>\uff09\uff0c\u5982\u679c\u8fd9\u4e2a<strong>\u7ebf\u7a0b<\/strong>\u6ca1\u6709<code>looper<\/code>\uff0c\u5219<strong>\u629b\u51fa\u5f02\u5e38<\/strong>\u3002<br \/>\n  4. \u53c2\u6570<code>Callback<\/code>\uff0c\u4e3a\u6b64<code>Handler<\/code><strong>\u5206\u53d1\u6d88\u606f<\/strong>\u65f6\uff0c<strong>\u4f18\u5148<\/strong>\u5904\u7406\u975e<code>Runnable<\/code>\u7684<code>Message<\/code>\u7684<code>Callback<\/code>\uff0c\u8be6\u7ec6\u89c1\u540e\u9762-<strong>\u5206\u53d1Message<\/strong>\u3002<br \/>\n  5. \u53c2\u6570<code>async<\/code>\uff0c\u4e3a\u6b64<code>Handler<\/code><strong>\u53d1\u9001\u6d88\u606f<\/strong>\u65f6\uff0c\u662f\u5426<strong>\u5168\u90e8<\/strong>\u53d1\u9001<strong>\u540c\u6b65<\/strong>\uff08\u9ed8\u8ba4<strong>\u540c\u6b65<\/strong>\uff09\u3001<strong>\u5f02\u6b65<\/strong>\u6d88\u606f\uff0c\u8be6\u7ec6\u89c1\u540e\u9762-<strong>\u53d1\u9001Message<\/strong>\u3002<br \/>\n  6. <strong>\u6d88\u606f<\/strong>\uff0c\u5206\u4e3a<strong>\u540c\u6b65\u6d88\u606f<\/strong>\u548c<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\uff0c<strong>\u9ed8\u8ba4<\/strong>\u4e3a<strong>\u540c\u6b65\u6d88\u606f<\/strong>\uff0c\u8be6\u7ec6\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085975951414132766#heading-10\">Android-Handler\u6e90\u7801\u89e3\u6790-Message-\u5f02\u6b65Message<\/a>\u3002<br \/>\n  7. <strong>\u540c\u6b65\u5c4f\u969c<\/strong>\uff0c\u4f1a<strong>\u5c4f\u969c\u540c\u6b65\u6d88\u606f<\/strong>\uff0c\u786e\u4fdd<strong>\u53ea\u6709\u5f02\u6b65\u6d88\u606f<\/strong>\u6267\u884c\uff0c\u8be6\u7ec6\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085977128092565512\/#heading-8\">Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue-\u540c\u6b65\u5c4f\u969c<\/a>\u3002\n<\/p><\/blockquote>\n<h4>\u6307\u5b9aLooper<\/h4>\n<p><strong>Handler(Looper)<\/strong><\/p>\n<pre><code class=\"language-java\">public Handler(@NonNull Looper looper) {\n    this(looper, null, false);\n}\n<\/code><\/pre>\n<p><strong>Handler(Looper, Callback)<\/strong><\/p>\n<pre><code class=\"language-java\">public Handler(@NonNull Looper looper, @Nullable Callback callback) {\n    this(looper, callback, false);\n}\n<\/code><\/pre>\n<p><strong>Handler(Looper, Callback, boolean)<\/strong><\/p>\n<pre><code class=\"language-java\">\/** @hide *\/\n@UnsupportedAppUsage\npublic Handler(@NonNull Looper looper, @Nullable Callback callback, boolean async) {\n    this(looper, callback, async, \/* shared= *\/ false);\n}\n<\/code><\/pre>\n<p><strong>Handler(Looper, Callback, boolean, boolean)<\/strong><\/p>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic Handler(@NonNull Looper looper, @Nullable Callback callback, boolean async,\n               boolean shared) {\n    mLooper = looper;\n    mQueue = looper.mQueue;\n    mCallback = callback;\n    mAsynchronous = async;\n    mIsShared = shared;\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a<strong>\u6784\u9020\u65b9\u6cd5<\/strong>\uff0c\u4f7f\u7528<strong>\u6307\u5b9a<\/strong>\u7684<code>Looper<\/code>\u800c<strong>\u4e0d\u662f\u9ed8\u8ba4<\/strong>\u7684<code>Looper<\/code>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Handler(Looper)<\/code>\u3001<code>Handler(Looper, Callback)<\/code>\u4e24\u4e2a\u6784\u9020\u65b9\u6cd5<strong>\u672a\u88ab\u6807\u8bb0<\/strong>\u4e3a<code>@Deprecated<\/code>\uff08\u8fc7\u65f6\uff09\uff0c\u5e76\u4f7f\u7528<strong>\u6307\u5b9a<\/strong>\u7684<code>Looper<\/code>\uff0c<strong>\u63a8\u8350<\/strong>\u4f7f\u7528\u3002<br \/>\n  2. <code>Handler(Looper, Callback, boolean)<\/code>\u3001<code>Handler(Looper, Callback, boolean, boolean)<\/code>\u6784\u9020\u65b9\u6cd5\u5df2\u7ecf\u88ab\u6807\u8bb0\u4e3a<code>@hide<\/code>\uff08\u9690\u85cf\uff09\uff0c\u53ea\u80fd<strong>\u7cfb\u7edf\u5185\u90e8<\/strong>\u4f7f\u7528\u3002\n<\/p><\/blockquote>\n<h3>Handler.createAsync()<\/h3>\n<p><strong>Handler.createAsync(Looper)<\/strong><\/p>\n<pre><code class=\"language-java\">@NonNull\npublic static Handler createAsync(@NonNull Looper looper) {\n    if (looper == null) throw new NullPointerException(\"looper must not be null\");\n    return new Handler(looper, null, true);\n}\n<\/code><\/pre>\n<p><strong>Handler.createAsync(Looper, Callback)<\/strong><\/p>\n<pre><code class=\"language-java\">@NonNull\npublic static Handler createAsync(@NonNull Looper looper, @NonNull Callback callback) {\n    if (looper == null) throw new NullPointerException(\"looper must not be null\");\n    if (callback == null) throw new NullPointerException(\"callback must not be null\");\n    return new Handler(looper, callback, true);\n}\n<\/code><\/pre>\n<p><code>Handler.createAsync()<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u9759\u6001<\/strong>\u65b9\u6cd5\uff0c\u521b\u5efa\u4e00\u4e2a<strong>\u5f02\u6b65<\/strong><code>Handler<\/code>\uff0c\u5176<strong>\u53d1\u5e03<\/strong>\u7684<code>Message<\/code>\u90fd\u662f<strong>\u5f02\u6b65<\/strong>\u7684\uff0c\u4e0d\u53d7<strong>\u540c\u6b65\u969c\u788d<\/strong>(\u5982\u663e\u793a<code>vsync<\/code>)\u7684\u5f71\u54cd\u3002<\/p>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><strong>\u521b\u5efa<\/strong>&#8211;<strong>\u540c\u6b65<\/strong><code>Handler<\/code>\uff0c\u5206\u4e3a<strong>\u672a\u6307\u5b9a<\/strong><code>Looper<\/code>\u3001<strong>\u6307\u5b9a<\/strong><code>Looper<\/code>\u4e24\u79cd\u65b9\u5f0f<strong>\u521b\u5efa<\/strong>\u3002\n<ul>\n<li><strong>\u672a\u6307\u5b9a<\/strong><code>Looper<\/code>\uff0c\u5219\u4f7f\u7528<strong>\u5f53\u524d\u7ebf\u7a0b<\/strong>\u7684<code>Looper<\/code>\uff0c<strong>\u4e0d\u63a8\u8350<\/strong>\u4f7f\u7528\u3002<\/li>\n<li><strong>\u6307\u5b9a<\/strong><code>Looper<\/code>\uff0c<strong>\u63a8\u8350<\/strong>\u4f7f\u7528\uff0c\u6784\u9020\u65b9\u6cd5\u4e3a<code>Handler(Looper)<\/code>\u3001<code>Handler(Looper, Callback)<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u521b\u5efa<\/strong>&#8211;<strong>\u5f02\u6b65<\/strong><code>Handler<\/code>\uff0c\u4f7f\u7528<code>Handler.createAsync(Looper)<\/code>\u3001<code>Handler.createAsync(Looper, Callback)<\/code>\u65b9\u6cd5<strong>\u521b\u5efa<\/strong>\uff0c\u5176\u53d1\u51fa\u7684<code>Message<\/code>\u90fd\u662f<strong>\u5f02\u6b65<\/strong>\u7684\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u521b\u5efaMessage<\/h2>\n<p>\u60f3\u8981<strong>\u4f7f\u7528<\/strong><code>Message<\/code>\uff0c\u53ef\u4ee5\u901a\u8fc7<code>Handler<\/code><strong>\u521b\u5efa<\/strong><code>Message<\/code>\uff0c\u6240\u4ee5\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0b\u5b83\u662f\u5982\u4f55\u88ab<strong>\u521b\u5efa<\/strong>\u7684\u3002<\/p>\n<h3>obtainMessage()<\/h3>\n<pre><code class=\"language-java\">@NonNull\npublic final Message obtainMessage() {\n    return Message.obtain(this);\n}\n\n@NonNull\npublic final Message obtainMessage(int what) {\n    return Message.obtain(this, what);\n}\n\n@NonNull\npublic final Message obtainMessage(int what, @Nullable Object obj) {\n    return Message.obtain(this, what, obj);\n}\n\n@NonNull\npublic final Message obtainMessage(int what, int arg1, int arg2) {\n    return Message.obtain(this, what, arg1, arg2);\n}\n\n@NonNull\npublic final Message obtainMessage(int what, int arg1, int arg2, @Nullable Object obj) {\n    return Message.obtain(this, what, arg1, arg2, obj);\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a<code>obtainMessage()<\/code>\u65b9\u6cd5 \uff0c\u4ece<strong>\u5168\u5c40\u6d88\u606f\u6c60<\/strong>\u8fd4\u56de\u4e00\u4e2a<strong>\u65b0\u7684\u6d88\u606f<\/strong>\u3002\u5185\u90e8\u4f7f\u7528<code>Message.obtain()<\/code>\u65b9\u6cd5<strong>\u521b\u5efa\u6d88\u606f<\/strong>\uff0c\u5e76\u5c06\u5176<code>Message<\/code>\u7684<code>target<\/code>\u4e3a\u5f53\u524d<code>Handler<\/code>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Message.obtain()<\/code>\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085975951414132766#heading-2\">Android-Handler\u6e90\u7801\u89e3\u6790-Message-\u521b\u5efaMessage<\/a>\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><code>handler.obtainMessage()<\/code>\u65b9\u6cd5\uff0c\u4f7f\u7528<code>Message.obtain()<\/code>\u65b9\u6cd5<strong>\u521b\u5efa\u6d88\u606f<\/strong>\uff0c\u5e76\u5c06\u5176<code>Message<\/code>\u7684<code>target<\/code>\u4e3a\u5f53\u524d<code>Handler<\/code>\uff0c\u4ee5\u8fdb\u884c<code>Message<\/code>\u548c<code>Handler<\/code><strong>\u4e00\u5bf9\u4e00\u5173\u7cfb<\/strong>\u7ed1\u5b9a\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u53d1\u9001Message<\/h2>\n<p><code>Message<\/code><strong>\u521b\u5efa<\/strong>\u597d\u540e\uff0c\u4fbf\u53ef\u4ee5<strong>\u53d1\u9001\u6d88\u606f<\/strong>\u4e86\uff0c<code>Handler<\/code>\u9664\u4e86\u53ef\u4ee5\u901a\u8fc7<code>sendMessage()<\/code>\u65b9\u6cd5<strong>\u53d1\u9001\u6d88\u606f<\/strong>\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7<code>post()<\/code>\u65b9\u6cd5<strong>\u6267\u884c\u6307\u5b9a<\/strong>\u7684<code>Runnable<\/code><strong>\u4efb\u52a1<\/strong>\uff0c\u6240\u4ee5\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0b\u5b83\u4eec\u662f\u5982\u4f55\u88ab<strong>\u53d1\u9001<\/strong>\u7684\u3002<\/p>\n<h3>send-Message<\/h3>\n<h4>sendMessage()<\/h4>\n<pre><code class=\"language-java\">public final boolean sendMessage(@NonNull Message msg) {\n    return sendMessageDelayed(msg, 0);\n}\n<\/code><\/pre>\n<h4>sendEmptyMessage()<\/h4>\n<pre><code class=\"language-java\">public final boolean sendEmptyMessage(int what) {\n    return sendEmptyMessageDelayed(what, 0);\n}\n<\/code><\/pre>\n<h4>sendMessageDelayed()<\/h4>\n<pre><code class=\"language-java\">public final boolean sendMessageDelayed(@NonNull Message msg, long delayMillis) {\n    if (delayMillis &lt; 0) {\n        delayMillis = 0;\n    }\n    return sendMessageAtTime(msg, SystemClock.uptimeMillis() + delayMillis);\n}\n<\/code><\/pre>\n<h4>sendEmptyMessageDelayed()<\/h4>\n<pre><code class=\"language-java\">public final boolean sendEmptyMessageDelayed(int what, long delayMillis) {\n    Message msg = Message.obtain();\n    msg.what = what;\n    return sendMessageDelayed(msg, delayMillis);\n}\n<\/code><\/pre>\n<h4>sendMessageAtTime()<\/h4>\n<pre><code class=\"language-java\">public boolean sendMessageAtTime(@NonNull Message msg, long uptimeMillis) {\n    MessageQueue queue = mQueue;\n    if (queue == null) {\n        RuntimeException e = new RuntimeException(\n                this + \" sendMessageAtTime() called with no mQueue\");\n        Log.w(\"Looper\", e.getMessage(), e);\n        return false;\n    }\n    return enqueueMessage(queue, msg, uptimeMillis);\n}\n<\/code><\/pre>\n<h4>sendEmptyMessageAtTime()<\/h4>\n<pre><code class=\"language-java\">public final boolean sendEmptyMessageAtTime(int what, long uptimeMillis) {\n    Message msg = Message.obtain();\n    msg.what = what;\n    return sendMessageAtTime(msg, uptimeMillis);\n}\n<\/code><\/pre>\n<h4>sendMessageAtFrontOfQueue()<\/h4>\n<pre><code class=\"language-java\">public final boolean sendMessageAtFrontOfQueue(@NonNull Message msg) {\n    MessageQueue queue = mQueue;\n    if (queue == null) {\n        RuntimeException e = new RuntimeException(\n            this + \" sendMessageAtFrontOfQueue() called with no mQueue\");\n        Log.w(\"Looper\", e.getMessage(), e);\n        return false;\n    }\n    return enqueueMessage(queue, msg, 0);\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u4e3a<strong>\u53d1\u9001\u7acb\u5373\u6d88\u606f<\/strong>\u3001<strong>\u53d1\u9001\u5ef6\u8fdf\u6d88\u606f<\/strong>\u3001<strong>\u53d1\u9001\u6307\u5b9a\u65f6\u523b\u6d88\u606f<\/strong>\u3001<strong>\u5c06\u6d88\u606f\u6392\u5728\u6d88\u606f\u961f\u5217\u7684\u524d\u9762<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>sendMessage()<\/code>\u3001<code>sendEmptyMessage()<\/code>\u4e3a<strong>\u53d1\u9001\u7acb\u5373Message<\/strong>\uff0c<code>sendMessageDelayed()<\/code>\u3001<code>sendEmptyMessageDelayed()<\/code>\u4e3a<strong>\u53d1\u9001\u5ef6\u8fdfMessage<\/strong>\uff0c<code>sendMessageAtTime()<\/code>\u3001<code>sendEmptyMessageAtTime()<\/code>\u4e3a<strong>\u53d1\u9001\u6307\u5b9a\u65f6\u523bMessage<\/strong>\uff0c<code>sendMessageAtFrontOfQueue()<\/code>\u4e3a<strong>\u53d1\u9001\u6392\u5728\u6d88\u606f\u961f\u5217\u7684\u524d\u9762\u7684Message<\/strong>\u3002<br \/>\n  2. <code>sendMessageAtFrontOfQueue()<\/code>\uff0c\u4e3a<strong>\u5c06\u6d88\u606f\u6392\u5728\u6d88\u606f\u961f\u5217\u7684\u524d\u9762<\/strong>\uff0c\u4ee5\u4fbf\u5728\u6d88\u606f<code>loop<\/code>\u7684<strong>\u4e0b\u4e00\u6b21<\/strong>\u8fed\u4ee3\u4e2d\u5904\u7406\u3002\u6b64\u65b9\u6cd5<strong>\u4ec5\u7528\u4e8e\u975e\u5e38\u7279\u6b8a<\/strong>\u7684\u60c5\u51b5\u2014\u2014\u5b83\u5f88\u5bb9\u6613\u4f7f<strong>\u6d88\u606f\u961f\u5217\u6328\u997f<\/strong>\u3001<strong>\u5bfc\u81f4\u6392\u5e8f\u95ee\u9898<\/strong>\u6216<strong>\u4ea7\u751f\u5176\u5b83<\/strong>\u610f\u60f3\u4e0d\u5230\u7684<strong>\u526f\u4f5c\u7528<\/strong>\u3002<br \/>\n  3. \u53c2\u6570<code>msg<\/code>\u4e3a\u8981\u53d1\u9001\u7684<code>Message<\/code>\uff0c\u53c2\u6570<code>what<\/code>\u4e3a<code>Message<\/code>\u7684\u6807\u8bc6\uff0c\u53c2\u6570<code>delayMillis<\/code>\u4e3a<strong>\u5ef6\u8fdf<\/strong>\u7684\u65f6\u95f4\uff0c\u53c2\u6570<code>uptimeMillis<\/code>\u4e3a<strong>\u6307\u5b9a<\/strong>\u7684\u65f6\u95f4\u3002\n<\/p><\/blockquote>\n<p><strong>\u53d1\u9001\u7acb\u5373\u6d88\u606f<\/strong>\u3001<strong>\u53d1\u9001\u5ef6\u8fdf\u6d88\u606f<\/strong>\u3001<strong>\u6307\u5b9a\u65f6\u523b\u53d1\u9001<\/strong>\u3001<strong>\u5c06\u6d88\u606f\u6392\u5728\u6d88\u606f\u961f\u5217\u7684\u524d\u9762<\/strong>\uff0c\u4ed6\u4eec\u6700\u7ec8\u8c03\u7528\u7684\u90fd\u662f<code>enqueueMessage()<\/code>\u65b9\u6cd5\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0b<code>enqueueMessage()<\/code>\u65b9\u6cd5\u3002<\/p>\n<p><strong>enqueueMessage()<\/strong><\/p>\n<pre><code class=\"language-java\">private boolean enqueueMessage(@NonNull MessageQueue queue, @NonNull Message msg,\n        long uptimeMillis) {\n    \/\/ \u6307\u5b9aMessage\u7684Handler\u4e3a\u6b64Handler\n    msg.target = this;\n    msg.workSourceUid = ThreadLocalWorkSource.getUid();\n\n    \/\/ \u5982\u679c\u6b64Handler\u662f\u5f02\u6b65\u7684\uff0c\u5219\u53d1\u9001\u7684\u6240\u6709\u6d88\u606f\u90fd\u662f\u5f02\u6b65\u7684\u3002\n    if (mAsynchronous) {\n        msg.setAsynchronous(true);\n    }\n    \/\/ \u4f7f\u7528MessageQueue\u5c06\u6d88\u606f\u52a0\u5165\u5230\u6d88\u606f\u961f\u5217\u4e2d\n    return queue.enqueueMessage(msg, uptimeMillis);\n}\n<\/code><\/pre>\n<p><code>enqueueMessage()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5c06<code>Message<\/code>\u52a0\u5165\u5230<code>MessageQueue<\/code>\u4e2d\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u6307\u5b9a<strong>\u6b64<\/strong><code>Message<\/code>\u7684<code>target<\/code>\u4e3a<strong>\u6b64<\/strong><code>Handler<\/code>\uff0c\u4f7f<strong>\u6b64<\/strong><code>Message<\/code>\u548c<strong>\u6b64<\/strong><code>Handler<\/code><strong>\u4e00\u5bf9\u4e00<\/strong>\u5173\u8054\uff0c\u4ee5\u4fbf<strong>\u6b64<\/strong><code>Message<\/code>\u7531<strong>\u6b64<\/strong><code>Handler<\/code>\u5904\u7406\u3002<br \/>\n  1. \u7531<strong>\u6b64<\/strong><code>Handler<\/code>\u53d1\u51fa\u7684\u6240\u6709<code>Message<\/code>\u90fd\u548c<strong>\u6b64<\/strong><code>Handler<\/code>\u7ed1\u5b9a\u5f97\u77e5\uff0c\u591a\u4e2a<code>Message<\/code>\u53ef\u4ee5\u5171\u7528\u4e00\u4e2a<code>Handler<\/code>\u3002<br \/>\n  2. \u5982\u679c\u6b64<code>Handler<\/code>\u662f<strong>\u5f02\u6b65<\/strong>\u7684\uff0c\u5219\u53d1\u9001\u7684<strong>\u6240\u6709\u6d88\u606f<\/strong>\u90fd\u662f<strong>\u5f02\u6b65<\/strong>\u7684\u3002<br \/>\n  3. <code>uptimeMillis<\/code>\u53c2\u6570\u4e3a<strong>\u6d88\u606f\u6267\u884c\u65f6\u523b<\/strong>\uff0c<strong>\u7acb\u5373\u6267\u884c<\/strong>\u7684\u4e3a<code>SystemClock.uptimeMillis()<\/code>\uff0c<strong>\u5ef6\u65f6\u6267\u884c<\/strong>\u7684\u4e3a<code>SystemClock.uptimeMillis() + delayMillis<\/code> \uff0c<strong>\u6307\u5b9a\u65f6\u523b\u53d1\u9001<\/strong>\u7684\u4e3a<code>\u6307\u5b9a\u7684<\/code>\uff0c<strong>\u5c06\u6d88\u606f\u6392\u5728\u6d88\u606f\u961f\u5217\u7684\u524d\u9762<\/strong>\u7684\u4e3a<code>0<\/code>\u3002<br \/>\n  4. <code>MessageQueue<\/code>\u5165\u961f\u6d88\u606f\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085977128092565512\/#heading-5\">Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue-\u5165\u961fMessage<\/a>\u3002\n<\/p><\/blockquote>\n<h3>post-Runnable<\/h3>\n<h4>post()<\/h4>\n<pre><code class=\"language-java\">public final boolean post(@NonNull Runnable r) {\n   return sendMessageDelayed(getPostMessage(r), 0);\n}\n<\/code><\/pre>\n<h4>postDelayed()<\/h4>\n<pre><code class=\"language-java\">public final boolean postDelayed(@NonNull Runnable r, long delayMillis) {\n    return sendMessageDelayed(getPostMessage(r), delayMillis);\n}\n\n\/** @hide *\/\npublic final boolean postDelayed(Runnable r, int what, long delayMillis) {\n    return sendMessageDelayed(getPostMessage(r).setWhat(what), delayMillis);\n}\n\npublic final boolean postDelayed(@NonNull Runnable r, @Nullable Object token, long delayMillis) {\n    return sendMessageDelayed(getPostMessage(r, token), delayMillis);\n}\n<\/code><\/pre>\n<h4>postAtTime()<\/h4>\n<pre><code class=\"language-java\">public final boolean postAtTime(@NonNull Runnable r, long uptimeMillis) {\n    return sendMessageAtTime(getPostMessage(r), uptimeMillis);\n}\n\npublic final boolean postAtTime(@NonNull Runnable r, @Nullable Object token, long uptimeMillis) {\n    return sendMessageAtTime(getPostMessage(r, token), uptimeMillis);\n}\n<\/code><\/pre>\n<h4>postAtFrontOfQueue()<\/h4>\n<pre><code class=\"language-java\">public final boolean postAtFrontOfQueue(@NonNull Runnable r) {\n    return sendMessageAtFrontOfQueue(getPostMessage(r));\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u90fd\u662f\u8c03\u7528<code>getPostMessage()<\/code>\u65b9\u6cd5\u5c06<code>Runnable<\/code>\u8fdb\u884c<strong>\u5305\u88c5<\/strong>\u8fd4\u56de<code>Message<\/code>\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u4e00\u4e0b<code>getPostMessage()<\/code>\u65b9\u6cd5\u7684\u5b9e\u73b0\u3002<\/p>\n<p><strong>getPostMessage()<\/strong><\/p>\n<pre><code class=\"language-java\">private static Message getPostMessage(Runnable r) {\n    \/\/ \u4f7f\u7528\u590d\u7528\u83b7\u53d6\u65b0\u7684Message\n    Message m = Message.obtain();\n    \/\/ \u5c06Runnable\u4fdd\u5b58\u5230Message\u7684callback\u4e2d\n    m.callback = r;\n    return m;\n}\n\n@UnsupportedAppUsage\nprivate static Message getPostMessage(Runnable r, Object token) {\n    Message m = Message.obtain();\n    m.obj = token;\n    m.callback = r;\n    return m;\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u4e3a<strong>\u53d1\u9001\u7acb\u5373Runnable<\/strong>\u3001<strong>\u53d1\u9001\u5ef6\u8fdfRunnable<\/strong>\u3001<strong>\u53d1\u9001\u6307\u5b9a\u65f6\u523bRunnable<\/strong>\u3001<strong>\u5c06Runnable\u6392\u5728\u6d88\u606f\u961f\u5217\u7684\u524d\u9762<\/strong>\u3002<\/p>\n<p>\u901a\u8fc7<code>getPostMessage()<\/code>\u65b9\u6cd5\u5c06<code>Runnable<\/code><strong>\u5305\u88c5<\/strong>\u4e3a<code>Message<\/code>\u7136\u540e\u8c03\u7528<strong>\u4e0a\u9762send-Message\u5bf9\u5e94<\/strong>\u7684<strong>\u53d1\u9001\u6d88\u606f<\/strong>\u7684\u65b9\u6cd5\u8fdb\u884c<strong>\u53d1\u9001<\/strong>\u3002<\/p>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><strong>\u53d1\u9001\u6d88\u606f<\/strong>\u5206\u4e3a<code>send-Message<\/code>\u3001<code>post-Runnable<\/code>\uff0c<code>post-Runnable<\/code>\u5e95\u5c42\u4e5f\u662f\u901a\u8fc7<code>send-Message<\/code>\u8fdb\u884c\u53d1\u9001\uff08\u5c06<code>Runnable<\/code>\u4fdd\u5b58\u5230<code>Message<\/code>\u7684<code>callback<\/code>\u4e2d\uff09\u3002<\/li>\n<li><code>sendMessageAtFrontOfQueue()<\/code>\u3001<code>postAtFrontOfQueue()<\/code>\uff0c\u65b9\u6cd5\u4e3a<strong>\u5c06\u6d88\u606f\u6392\u5728\u6d88\u606f\u961f\u5217\u7684\u524d\u9762<\/strong>\uff0c\u4f1a\u4f7f\u539f\u6765<strong>\u6709\u5e8f<\/strong>\u7684\u961f\u5217\u53d8\u4e3a<strong>\u65e0\u5e8f<\/strong>\u7684\uff0c<strong>\u8c28\u614e\u4f7f\u7528<\/strong>\u3002<\/li>\n<li>\u901a\u8fc7<code>handler<\/code>\u53d1\u9001\u7684\u6d88\u606f\uff0c\u6700\u7ec8\u90fd\u4f1a\u5c06<strong>\u6b64<\/strong><code>Message<\/code>\u548c<strong>\u6b64<\/strong><code>Handler<\/code><strong>\u4e00\u5bf9\u4e00<\/strong>\u5173\u8054\uff0c\u4ee5\u4fbf<strong>\u6b64<\/strong><code>Message<\/code>\u7531<strong>\u6b64<\/strong><code>Handler<\/code>\u5904\u7406\u3002<\/li>\n<li>\u5982\u679c\u6b64<code>Handler<\/code>\u662f<strong>\u5f02\u6b65<\/strong>\u7684\uff0c\u5219\u53d1\u9001\u7684<strong>\u6240\u6709\u6d88\u606f<\/strong>\u90fd\u662f<strong>\u5f02\u6b65<\/strong>\u7684\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u5206\u53d1Message<\/h2>\n<p>\u5f53<code>Looper.loop()<\/code>\u65b9\u6cd5<strong>\u5f00\u542f\u540e<\/strong>\uff0c\u5e76\u4e14\u6b64<code>Looper<\/code>\u7684<code>MessageQueue<\/code>\u7684<code>next()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a<code>Message<\/code>\u540e\uff0c\u4f1a\u8c03\u7528<code>Handler<\/code>\u7684<code>dispatchMessage()<\/code>\u65b9\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n<p><strong>Loop->loopOnce()<\/strong><\/p>\n<pre><code class=\"language-java\">private static boolean loopOnce(final Looper me,\n            final long ident, final int thresholdOverride) {\n        Message msg = me.mQueue.next(); \/\/ might block\n        ...\n        \/\/ \u8c03\u7528Handler\u5206\u53d1\u6d88\u606f\n        msg.target.dispatchMessage(msg);\n        ...\n    }\n<\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u4e00\u4e0b<code>Handler<\/code>\u7684<code>dispatchMessage()<\/code>\u65b9\u6cd5\u3002<\/p>\n<h3>dispatchMessage()<\/h3>\n<p><strong>Handler->dispatchMessage()<\/strong><\/p>\n<pre><code class=\"language-java\">public void dispatchMessage(@NonNull Message msg) {\n    if (msg.callback != null) {\n        \/\/ \u5904\u7406Runnable\n        handleCallback(msg);\n    } else {\n          \/\/ \u5904\u7406Message\n        if (mCallback != null) {\n            \/\/ handler\u7684Callback\u4e0d\u4e3a\u7a7a\uff0c\u4f18\u5148\u5b83\u5904\u7406\u3002\n            if (mCallback.handleMessage(msg)) {\n                \/\/ \u8fd4\u56detrue\uff0c\u8868\u793ahandler\u7684Callback\u5df2\u7ecf\u5904\u7406\uff0c\u4e0d\u518d\u9700\u8981handler\u7684handleMessage()\u65b9\u6cd5\u5904\u7406\u3002\n                return;\n            }\n        }\n        \/\/ \u4f7f\u7528handler\u7684handleMessage\u65b9\u6cd5\u5904\u7406\n        handleMessage(msg);\n    }\n}\n<\/code><\/pre>\n<p><code>dispatchMessage()<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5206\u53d1\u6d88\u606f<\/strong>\uff0c\u5206\u4e3a<strong>\u5904\u7406<\/strong><code>Runnable<\/code>\u3001<strong>\u5904\u7406<\/strong><code>Message<\/code>\u3002\u800c<strong>\u5904\u7406<\/strong><code>Message<\/code><strong>\u4f18\u5148<\/strong><code>handler<\/code>\u7684<code>mCallback<\/code><strong>\u5904\u7406<\/strong>\uff0c\u5982\u679c<code>mCallback<\/code>\u4e3a<strong>\u7a7a<\/strong>\u6216\u8005\u5176<code>mCallback.handleMessage(msg)<\/code>\u8fd4\u56de<code>false<\/code>\uff0c\u5176\u6b21\u518d<code>handler<\/code>\u7684<code>handleMessage()<\/code>\u65b9\u6cd5<strong>\u5904\u7406<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>dispatchMessage()<\/code>\u65b9\u6cd5\u4e3a<code>public<\/code>\u5e76\u4e14<strong>\u4e0d\u662f<\/strong><code>final<\/code>\uff0c\u6240\u4ee5\u53ef\u4ee5\u88ab<strong>\u8986\u5199<\/strong>\uff0c\u4e00\u822c<strong>\u4e0d\u8986\u5199<\/strong>\u6b64\u65b9\u6cd5\u3002\n<\/p><\/blockquote>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b<strong>\u5904\u7406<\/strong><code>Callback<\/code>\u7684<code>handleCallback()<\/code>\u65b9\u6cd5\u3002<\/p>\n<p><strong>handleCallback()<\/strong><\/p>\n<pre><code class=\"language-java\">private static void handleCallback(Message message) {\n    \/\/ \u8c03\u7528callback.run()\u65b9\u6cd5\uff08\u5373runnable.run()\u65b9\u6cd5\uff09\u6267\u884c\n    message.callback.run();\n}\n<\/code><\/pre>\n<p><code>handleCallback()<\/code>\u65b9\u6cd5\uff0c\u76f4\u63a5\u8c03\u7528<code>message<\/code>\u7684<code>callback<\/code>\uff08\u5373<code>Runnable<\/code>\uff09\u7684<code>run()<\/code>\u65b9\u6cd5<strong>\u6267\u884c<\/strong>\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b<strong>\u4f18\u5148\u5904\u7406<\/strong><code>Message<\/code>\u7684<code>Handler.Callback<\/code>\u7c7b\uff0c\u5176\u6b21\u518d\u6765\u770b\u4e00\u4e0b<strong>\u5176\u6b21\u5904\u7406<\/strong>\u7684<code>handleMessage()<\/code>\u65b9\u6cd5\u3002<\/p>\n<p><strong>Handler.Callback\u7c7b<\/strong><\/p>\n<pre><code class=\"language-java\">public interface Callback {\n    \/**\n     * @return \u5982\u679c\u4e0d\u9700\u8981\u8fdb\u4e00\u6b65\u5904\u7406\uff0c\u5219\u4e3aTrue\u3002\n     *\/\n    boolean handleMessage(@NonNull Message msg);\n}\n<\/code><\/pre>\n<p>\u5982\u679c<code>handler.mCallback<\/code>\u6709\u8bbe\u7f6e\u503c\uff0c\u5219<strong>\u4f18\u5148<\/strong>\u5b83\u6765\u5904\u7406\uff0c\u5e76\u4e14<code>mCallback.handleMessage(msg)<\/code>\u65b9\u6cd5\u8fd4\u56de<code>true<\/code>\uff0c\u5219\u4e0d\u518d\u9700\u8981\u6b64<code>handler<\/code>\u7684<code>handleMessage()<\/code>\u65b9\u6cd5\u5904\u7406\u3002<\/p>\n<p><strong>handleMessage()<\/strong><\/p>\n<pre><code class=\"language-java\">public void handleMessage(@NonNull Message msg) {\n}\n<\/code><\/pre>\n<p><code>handleMessage()<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5904\u7406\u6d88\u606f<\/strong>\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7<code>Message<\/code>\u7684<code>what<\/code>\u7684\u503c\u6765\u533a\u5206\uff0c\u6765\u5b9e\u73b0\u81ea\u5df1\u7684\u903b\u8f91\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>handleMessage()<\/code>\u65b9\u6cd5\u4e3a<code>public<\/code>\u5e76\u4e14<strong>\u4e0d\u662f<\/strong><code>final<\/code>\uff0c\u6240\u4ee5\u53ef\u4ee5\u88ab<strong>\u8986\u5199<\/strong>\uff0c\u4e00\u822c<strong>\u8986\u5199<\/strong>\u6b64\u65b9\u6cd5\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><strong>\u5206\u53d1<\/strong><code>Message<\/code>\uff0c\u5b83\u662f\u901a\u8fc7<code>Handler<\/code>\u7684<code>dispatchMessage()<\/code>\u65b9\u6cd5\u8fdb\u884c<strong>\u5206\u53d1\u5904\u7406<\/strong>\u3002<\/li>\n<li><strong>\u5206\u53d1<\/strong><code>Message<\/code>\uff0c\u5b83\u5206\u4e3a<strong>\u5904\u7406<\/strong><code>Runnable<\/code>\u3001<strong>\u5904\u7406<\/strong><code>Message<\/code>\u3002<br \/>\n  2.1.<strong>\u5904\u7406<\/strong><code>Runnable<\/code>\uff0c\u76f4\u63a5\u8c03\u7528<code>callback<\/code>\uff08\u5373<code>Runnable<\/code>\uff09\u7684<code>run()<\/code>\u65b9\u6cd5\u6267\u884c\u3002<br \/>\n  2.2.<strong>\u5904\u7406<\/strong><code>Message<\/code>\uff0c<strong>\u4f18\u5148<\/strong><code>handler<\/code>\u7684<code>mCallback<\/code><strong>\u5904\u7406<\/strong>\uff0c\u5176\u6b21\u518d<code>handler<\/code>\u7684<code>handleMessage()<\/code>\u65b9\u6cd5\u5904\u7406\u3002<\/li>\n<li><code>dispatchMessage()<\/code>\u3001<code>handleMessage()<\/code>\u65b9\u6cd5\u5747\u53ef\u4ee5\u88ab<strong>\u8986\u5199<\/strong>\uff0c\u4e00\u822c<strong>\u53ea\u8986\u5199<\/strong><code>handleMessage()<\/code>\u65b9\u6cd5\u5373\u53ef\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u79fb\u9664Messages\u3001Runnable<\/h2>\n<h3>removeMessages()<\/h3>\n<pre><code class=\"language-java\">public final void removeMessages(int what) {\n    mQueue.removeMessages(this, what, null);\n}\n\npublic final void removeMessages(int what, @Nullable Object object) {\n    mQueue.removeMessages(this, what, disallowNullArgumentIfShared(object));\n}\n<\/code><\/pre>\n<h3>removeEqualMessages()<\/h3>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic final void removeEqualMessages(int what, @Nullable Object object) {\n    mQueue.removeEqualMessages(this, what, disallowNullArgumentIfShared(object));\n}\n<\/code><\/pre>\n<h3>removeCallbacks()<\/h3>\n<pre><code class=\"language-java\">public final void removeCallbacks(@NonNull Runnable r) {\n    mQueue.removeMessages(this, r, null);\n}\n\npublic final void removeCallbacks(@NonNull Runnable r, @Nullable Object token) {\n    mQueue.removeMessages(this, r, token);\n}\n<\/code><\/pre>\n<h3>removeCallbacksAndMessages()<\/h3>\n<pre><code class=\"language-java\">public final void removeCallbacksAndMessages(@Nullable Object token) {\n    mQueue.removeCallbacksAndMessages(this, disallowNullArgumentIfShared(token));\n}\n<\/code><\/pre>\n<h3>removeCallbacksAndEqualMessages()<\/h3>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic final void removeCallbacksAndEqualMessages(@Nullable Object token) {\n    mQueue.removeCallbacksAndEqualMessages(this, disallowNullArgumentIfShared(token));\n}\n<\/code><\/pre>\n<pre><code class=\"language-java\">private Object disallowNullArgumentIfShared(@Nullable Object arg) {\n    if (mIsShared &amp;&amp; arg == null) {\n        \/\/ \u662f\u5171\u4eabHandler\uff0c\u5219\u4e0d\u5141\u8bb8\u53c2\u6570\u4e3a\u7a7a\u3002\n        throw new IllegalArgumentException(\"Null argument disallowed for shared handler.\"\n                + \" Consider creating your own Handler instance.\");\n    }\n    return arg;\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u4e3a<strong>\u3010\u79fb\u9664\u3011\u6b64Handler\u53d1\u51fa<\/strong>\u7684<code>Message<\/code>\uff08\u6307\u5b9a<code>what<\/code>\u3001<code>obj<\/code>\uff09\u3001<code>Runnable<\/code>\uff08\u6307\u5b9a<code>runnable<\/code>\u3001<code>token<\/code>\uff09\uff0c\u5168\u90e8\u90fd\u662f\u901a\u8fc7\u8c03\u7528<code>MessageQueue<\/code>\u7684<code>removeXXX<\/code>\u65b9\u6cd5\u8fdb\u884c<strong>\u79fb\u9664<\/strong>\u3002<\/p>\n<p>\u5185\u90e8\u8c03\u7528\u4e86<code>disallowNullArgumentIfShared()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5982\u679c\u662f\u5171\u4eab<code>Handler<\/code>\uff08<code>mIsShared<\/code>\u4e3a<code>true<\/code>\uff09\u5219\u4e0d\u5141\u8bb8\u53c2\u6570\u4e3a\u7a7a\uff0c\u9ed8\u8ba4<code>mIsShared<\/code>\u4e3a<code>false<\/code>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>removeMessages()<\/code>\u3001<code>removeEqualMessages()<\/code>\uff1a\u4e3a\u5220\u9664\u6b64<code>Handler<\/code>\u53d1\u51fa\u7684<code>Message<\/code>\uff0c\u53c2\u6570<code>what<\/code>\u4e3a<code>Message<\/code>\u7684\u6807\u8bc6\uff0c\u53c2\u6570<code>obj<\/code>\u4e3a\u8f85\u52a9\uff08\u5220\u9664\u540c\u65f6\u6ee1\u8db3<code>what<\/code>\u548c<code>obj<\/code>\u7684<code>Message<\/code>\uff09\u3002<br \/>\n  2. <code>removeCallbacks()<\/code>\uff1a\u4e3a\u5220\u9664\u6b64<code>Handler<\/code>\u53d1\u51fa\u7684<code>Runnable<\/code>\uff0c\u53c2\u6570<code>runnable<\/code>\u4e3a<code>Runnable<\/code>\u5bf9\u8c61\uff0c\u53c2\u6570<code>token<\/code>\u4e3a\u8f85\u52a9\uff08\u5220\u9664\u540c\u65f6\u6ee1\u8db3<code>runnable<\/code>\u548c<code>token<\/code>\u7684<code>Runnable<\/code>\uff09\u3002<br \/>\n  3. <code>removeCallbacksAndMessages()<\/code>\u3001<code>removeCallbacksAndEqualMessages()<\/code>\uff1a\u4e3a\u5220\u9664\u6b64<code>Handler<\/code>\u53d1\u51fa\u7684<code>Message<\/code>\u548c\u6b64<code>Runnable<\/code>\uff0c\u53c2\u6570<code>token<\/code>\u4e3a<code>Message<\/code>\u3001<code>Runnable<\/code>\u7684\u6807\u8bc6\u3002\u53c2\u6570<code>token<\/code>\u4e3a\u5220\u9664\u6240\u6709<code>obj<\/code>\u4e3a<code>token<\/code>\u7684<code>Runnable<\/code>\u548c<code>Message<\/code>\uff0c\u5982\u679c<code>token<\/code>\u4e3a\u7a7a\uff0c\u6240\u6709<code>Runnable<\/code>\u548c<code>Message<\/code>\u5c06\u88ab\u5220\u9664\u3002<br \/>\n  4. <code>removeEqualMessages()<\/code>\u3001<code>removeCallbacksAndEqualMessages()<\/code>\uff1a\u4e24\u4e2a\u4e3a<code>@hide<\/code>\u65b9\u6cd5\uff0c\u53ea\u80fd\u7cfb\u7edf\u8c03\u7528\u3002<br \/>\n  5. <strong>\u5e26\u6709<\/strong><code>Equal<\/code>\u548c<strong>\u4e0d\u5e26\u6709<\/strong><code>Equal<\/code>\u7684\u533a\u522b\u662f\uff0c\u5728<strong>\u6bd4\u8f83<\/strong>\u8f85\u52a9\u53c2\u6570<code>obj<\/code>\u3001<code>token<\/code>\u65f6\uff0c<strong>\u4e0d\u5e26\u6709<\/strong><code>Equal<\/code>\u662f\u6bd4\u8f83\u7684<strong>==<\/strong>\uff08<strong>\u5bf9\u8c61\u5f15\u7528<\/strong>\uff09\uff0c\u800c<strong>\u5e26\u6709<\/strong><code>Equal<\/code>\u6bd4\u8f83\u7684\u662f<code>equals()<\/code>\u65b9\u6cd5\uff08<strong>\u5bf9\u8c61\u5185\u5bb9<\/strong>\uff09\u3002<br \/>\n  6. <code>MessageQueue<\/code>\u79fb\u9664\u6d88\u606f\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085977128092565512\/#heading-19\">Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue-\u79fb\u9664Message<\/a>\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><strong>\u3010\u79fb\u9664\u3011\u6b64Handler\u53d1\u51fa<\/strong>\u7684<code>Message<\/code>\uff08\u6307\u5b9a<code>what<\/code>\u3001<code>obj<\/code>\uff09\u3001<code>Runnable<\/code>\uff08\u6307\u5b9a<code>runnable<\/code>\u3001<code>token<\/code>\uff09\uff0c\u5168\u90e8\u90fd\u662f\u901a\u8fc7\u8c03\u7528<code>MessageQueue<\/code>\u7684<code>removeXXX<\/code>\u65b9\u6cd5\u8fdb\u884c<strong>\u79fb\u9664<\/strong>\u3002<\/li>\n<li><code>removeCallbacksAndMessages()<\/code>\uff1a\u53c2\u6570<code>token<\/code>\u5982\u679c\u4e3a\u7a7a\uff0c\u5219<strong>\u5220\u9664\u6b64<\/strong><code>Handler<\/code>\u53d1\u51fa\u7684<strong>\u6240\u6709<\/strong><code>Runnable<\/code>\u548c<code>Message<\/code>\u3002<\/li>\n<li><strong>\u5e26\u6709<\/strong><code>Equal<\/code>\u548c<strong>\u4e0d\u5e26\u6709<\/strong><code>Equal<\/code>\u7684\u533a\u522b\u662f\uff0c\u5728<strong>\u6bd4\u8f83<\/strong>\u8f85\u52a9\u53c2\u6570<code>obj<\/code>\u3001<code>token<\/code>\u65f6\uff0c<strong>\u4e0d\u5e26\u6709<\/strong><code>Equal<\/code>\u662f\u6bd4\u8f83\u7684<strong>==<\/strong>\uff08<strong>\u5bf9\u8c61\u5f15\u7528<\/strong>\uff09\uff0c\u800c<strong>\u5e26\u6709<\/strong><code>Equal<\/code>\u6bd4\u8f83\u7684\u662f<code>equals()<\/code>\u65b9\u6cd5\uff08<strong>\u5bf9\u8c61\u5185\u5bb9<\/strong>\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u662f\u5426\u6709Messages\u3001Runnable<\/h2>\n<h3>hasMessages()<\/h3>\n<pre><code class=\"language-java\">public final boolean hasMessages(int what) {\n    return mQueue.hasMessages(this, what, null);\n}\n\npublic final boolean hasMessages(int what, @Nullable Object object) {\n    return mQueue.hasMessages(this, what, object);\n}\n<\/code><\/pre>\n<h3>hasEqualMessages()<\/h3>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic final boolean hasEqualMessages(int what, @Nullable Object object) {\n    return mQueue.hasEqualMessages(this, what, object);\n}\n<\/code><\/pre>\n<h3>hasCallbacks()<\/h3>\n<pre><code class=\"language-java\">public final boolean hasCallbacks(@NonNull Runnable r) {\n    return mQueue.hasMessages(this, r, null);\n}\n<\/code><\/pre>\n<h3>hasMessagesOrCallbacks()<\/h3>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic final boolean hasMessagesOrCallbacks() {\n    return mQueue.hasMessages(this);\n}\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u4e3a<strong>\u3010\u5224\u65ad\u662f\u5426\u6709\u3011\u6b64Handler\u53d1\u51fa<\/strong><code>\u7684Message<\/code>\uff08\u6307\u5b9a<code>what<\/code>\u3001<code>obj<\/code>\uff09\u3001<code>Runnable<\/code>\uff08\u6307\u5b9a<code>runnable<\/code>\uff09\uff0c\u5168\u90e8\u90fd\u662f\u901a\u8fc7\u8c03\u7528<code>MessageQueue<\/code>\u7684<code>hasMessages()<\/code> \u65b9\u6cd5\u8fdb\u884c<strong>\u5224\u65ad<\/strong>\u3002\u903b\u8f91\u540c\u4e0a<strong>\u79fb\u9664Messages\u3001Runnable<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>hasMessagesOrCallbacks()<\/code>\uff1a\u4e3a\u5224\u65ad\u662f\u5426\u6709<strong>\u6b64<\/strong><code>Handler<\/code>\u53d1\u51fa<code>Message<\/code>\u3001<code>Runnable<\/code>\u3002<br \/>\n  2. <code>hasEqualMessages()<\/code>\u3001<code>hasMessagesOrCallbacks()<\/code>\uff1a\u4e24\u4e2a\u4e3a<code>@hide<\/code>\u65b9\u6cd5\uff0c\u53ea\u80fd\u7cfb\u7edf\u8c03\u7528\u3002<br \/>\n  3. <code>MessageQueue<\/code>\u662f\u5426\u6709\u6d88\u606f\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085977128092565512\/#heading-30\">Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue-\u662f\u5426\u6709Message<\/a>\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><strong>\u3010\u5224\u65ad\u662f\u5426\u6709\u3011\u6b64Handler\u53d1\u51fa<\/strong><code>\u7684Message<\/code>\uff08\u6307\u5b9a<code>what<\/code>\u3001<code>obj<\/code>\uff09\u3001<code>Runnable<\/code>\uff08\u6307\u5b9a<code>runnable<\/code>\uff09\uff0c\u5168\u90e8\u90fd\u662f\u901a\u8fc7\u8c03\u7528<code>MessageQueue<\/code>\u7684<code>hasMessages()<\/code> \u65b9\u6cd5\u8fdb\u884c<strong>\u5224\u65ad<\/strong>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u5176\u5b83<\/h2>\n<h3>getMessageName()<\/h3>\n<pre><code class=\"language-java\">public String getMessageName(@NonNull Message message) {\n    if (message.callback != null) {\n        \/\/ \u662fRunnable\u7c7b\u578b\uff0c\u8fd4\u56de\u6b64Runnable\u7684\u7c7b\u540d\u3002\n        return message.callback.getClass().getName();\n    }\n    \/\/ \u662fMessage\u7c7b\u578b\uff0c\u8fd4\u56de\u6b64Message\u7684what\u7684\u5341\u516d\u8fdb\u5236\u3002\n    return \"0x\" + Integer.toHexString(message.what);\n}\n<\/code><\/pre>\n<p><strong>\u83b7\u53d6<\/strong>\u8868\u793a<strong>\u6307\u5b9a<\/strong><code>Message<\/code><strong>\u540d\u79f0<\/strong>\u7684<strong>\u5b57\u7b26\u4e32<\/strong>\u3002<strong>\u9ed8\u8ba4\u5b9e\u73b0<\/strong>\uff0c\u662f<code>Runnable<\/code>\u7c7b\u578b\u8fd4\u56de\u6b64<code>Runnable<\/code>\u7684<strong>\u7c7b\u540d<\/strong>\uff0c\u662f<code>Message<\/code>\u7c7b\u578b\u8fd4\u56de\u6b64<code>Message<\/code>\u7684<code>what<\/code>\u7684<strong>\u5341\u516d\u8fdb\u5236<\/strong>\u3002<\/p>\n<h3>getLooper()<\/h3>\n<pre><code class=\"language-java\">@NonNull\npublic final Looper getLooper() {\n    return mLooper;\n}\n<\/code><\/pre>\n<p><strong>\u83b7\u53d6<\/strong>\u6b64<code>Handler<\/code>\u7684<code>Looper<\/code>\u5bf9\u8c61<\/p>\n<h3>dump()<\/h3>\n<pre><code class=\"language-java\">public final void dump(@NonNull Printer pw, @NonNull String prefix) {\n    pw.println(prefix + this + \" @ \" + SystemClock.uptimeMillis());\n    if (mLooper == null) {\n        pw.println(prefix + \"looper uninitialized\");\n    } else {\n        mLooper.dump(pw, prefix + \"  \");\n    }\n}\n<\/code><\/pre>\n<p>\u8f6c\u50a8<code>looper<\/code>\u7684\u72b6\u6001\uff0c\u4ee5\u8fdb\u884c\u8c03\u8bd5\u3002\u5982\u679c<code>Looper<\/code>\u4e3a\u7a7a\uff0c\u76f4\u63a5\u6253\u5370\uff0c\u5426\u5219\u8c03\u7528<code>Looper<\/code>\u7684<code>dump()<\/code>\u65b9\u6cd5\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Looper<\/code>\u8f6c\u50a8\u7684\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976341056585742#heading-24\">Android-Handler\u6e90\u7801\u89e3\u6790-Looper-dump()<\/a>\u3002\n<\/p><\/blockquote>\n<h1>\u603b\u7ed3<\/h1>\n<p>\u4ee5\u4e0a\u5c31\u662f<code>Handler<\/code>\u6e90\u7801\u7684<code>Handler<\/code>\u90e8\u5206\uff0c<code>Handler<\/code>\u5176\u5b83\u6e90\u7801\u90e8\u5206\u770b\u4e0b\u9762<strong>\u5bfc\u822a<\/strong>\u3002\u6b22\u8fce\u5927\u5bb6<strong>\u70b9\u8d5e\u3001\u6536\u85cf<\/strong>\uff0c\u4ee5\u65b9\u4fbf\u60a8\u540e\u7eed\u67e5\u770b\uff0c\u4e4b\u540e\u4f1a\u51fa\u5176\u5b83<code>Android<\/code>\u6e90\u7801\u7cfb\u5217\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u3002\u5982\u679c\u4f60\u6709\u4ec0\u4e48\u95ee\u9898\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u533a\u7559\u8a00\uff01<\/p>\n<blockquote><p>\n  <strong>\u5bfc\u822a\uff1a<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/juejin.cn\/post\/7475656733558652943\">Android-Handler\u6e90\u7801\u89e3\u6790-\u4f7f\u7528<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085976728538972190\">Android-Handler\u6e90\u7801\u89e3\u6790-Handler\uff08\u4e00\uff09<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085976341056585742\">Android-Handler\u6e90\u7801\u89e3\u6790-Looper\uff08\u4e8c\uff09<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085977128092565512\">Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue\uff08\u4e09\uff09<\/a><\/li>\n<li><a href=\"https:\/\/juejin.cn\/post\/7085975951414132766\">Android-Handler\u6e90\u7801\u89e3\u6790-Message\uff08\u56db\uff09<\/a><\/li>\n<li>\u66f4\u591a\u7684\u6587\u7ae0\u770b\u8fd9\u91cc\uff1a<a href=\"https:\/\/juejin.cn\/user\/4450479132652679\/posts\">\u4e3b\u9875<\/a><\/li>\n<\/ul>\n<\/blockquote>\n<p>\u6700\u540e\u63a8\u8350\u4e00\u4e0b\u6211\u7684\u7f51\u7ad9\uff0c\u5f00\u53d1\u8005\uff08<code>Developer<\/code>\uff09\u7684\u535a\u5ba2\uff08<code>Blog<\/code>\uff09: <a href=\"http:\/\/www.devblog.cn\/\">devblog.cn<\/a> \uff0c\u6b22\u8fce\u5927\u5bb6\u6765\u4f53\u9a8c\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Android-Handler\u6e90\u7801\u89e3\u6790-Handler\uff08\u4e00\uff09 \u6e90\u7801\u7248\u672c\uff1a * Handler\uff1aSDK-35 * [&hellip;]<\/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":[24,10],"tags":[31,20],"class_list":["post-129","post","type-post","status-publish","format-standard","hentry","category-source-android","category-source","tag-android","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\/129","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=129"}],"version-history":[{"count":5,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/129\/revisions"}],"predecessor-version":[{"id":218,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/129\/revisions\/218"}],"wp:attachment":[{"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=129"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}