{"id":131,"date":"2022-04-17T12:57:04","date_gmt":"2022-04-17T12:57:04","guid":{"rendered":"http:\/\/www.devblog.cn\/?p=131"},"modified":"2025-03-03T17:55:36","modified_gmt":"2025-03-03T09:55:36","slug":"android-handler%e6%ba%90%e7%a0%81%e8%a7%a3%e6%9e%90-messagequeue","status":"publish","type":"post","link":"http:\/\/www.devblog.cn\/?p=131","title":{"rendered":"Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue\uff08\u4e09\uff09"},"content":{"rendered":"<h1>Android-Handler\u6e90\u7801\u89e3\u6790-MessageQueue\uff08\u4e09\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\">\/\/ Log\u7684Tag\nprivate static final String TAG = \"MessageQueue\";\n\/\/ \u662f\u5426\u662fDebug\nprivate static final boolean DEBUG = false;\n\n\/\/ \u6b64\u6d88\u606f\u961f\u5217\u662f\u5426\u53ef\u4ee5\u9000\u51fa\uff0ctrue\u4e3a\u53ef\u4ee5\u9000\u51fa\u3002\n@UnsupportedAppUsage\nprivate final boolean mQuitAllowed;\n\n\/\/ natvie \u5c42\u7684\u6d88\u606f\u961f\u5217\u7684\u6807\u8bc6\n@UnsupportedAppUsage\nprivate long mPtr; \/\/ used by native code\n\n\/\/ \u6b64\u6d88\u606f\u961f\u5217\u7684\u5934\u5143\u7d20\n@UnsupportedAppUsage\nMessage mMessages;\n\/\/ \u6b64\u6d88\u606f\u961f\u5217\u7684\u5c3e\u5143\u7d20\nprivate Message mLast;\n\/\/ \u6b64\u6d88\u606f\u961f\u5217\u7684\u6240\u6709IdleHandler\uff0cIdleHandler\u5f53\u6b64\u6d88\u606f\u961f\u5217\u7a7a\u95f2\u65f6\u6267\u884c\u3002\n@UnsupportedAppUsage\nprivate final ArrayList&lt;IdleHandler&gt; mIdleHandlers = new ArrayList&lt;IdleHandler&gt;();\n\/\/ \u6dfb\u52a0\u7684FileDescriptorRecord\u96c6\u5408\uff0cFileDescriptorRecord\u8bb0\u5f55\u4e86FileDescriptor\u3001\u4e8b\u4ef6\uff08\u6587\u4ef6\u8f93\u5165\u3001\u8f93\u51fa\u3001\u9519\u8bef\uff09\u3001\u76d1\u542c\uff0c\u5f53\u6587\u4ef6\u4ea7\u751f\u76f8\u5e94\u4e8b\u4ef6\u65f6\uff0c\u56de\u8c03\u76d1\u542c\u3002\nprivate SparseArray&lt;FileDescriptorRecord&gt; mFileDescriptorRecords;\n\/\/ \u7b49\u5f85\u6267\u884c\u7684\u6240\u6709IdleHandler\nprivate IdleHandler[] mPendingIdleHandlers;\n\/\/ \u6b64\u6d88\u606f\u961f\u5217\u662f\u5426\u9000\u51fa\u4e2d\nprivate boolean mQuitting;\n\n\/\/ \u6b64\u6d88\u606f\u961f\u5217\u662f\u5426\u662f\u963b\u585e\u7684\nprivate boolean mBlocked;\n\n\/\/ \u8ddf\u8e2a\u5f02\u6b65\u6d88\u606f\u7684\u6570\u91cf\u3002\u6211\u4eec\u5728enqueueMessage()\u4e2d\u4f7f\u7528\u5b83\uff0c\u6765\u907f\u514d\u5728\u961f\u5217\u5c3e\u90e8\u63d2\u5165\u6d88\u606f\u65f6\uff0c\u641c\u7d22\u5f02\u6b65\u6d88\u606f\u3002\nprivate int mAsyncMessageCount;\n\n\/\/ \u4e0b\u4e00\u4e2a\u5c4f\u969ctoken\u3002\n\/\/ \u969c\u788d\u7531\u5e26\u6709\u7a7atarget\u7684\u6d88\u606f\u8868\u793a\uff0c\u5176arg1\u5b57\u6bb5\u643a\u5e26token\u3002\n@UnsupportedAppUsagejava\nprivate int mNextBarrierToken;\n<\/code><\/pre>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<\/p>\n<ol>\n<li><code>Message<\/code>\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085975951414132766\">Android-Handler\u6e90\u7801\u89e3\u6790-Message<\/a>\u3002<\/li>\n<li><code>MessageQueue<\/code>\u4e3a\u4ec0\u4e48\u9700\u8981\u6301\u6709<code>Message<\/code>\uff0c\u56e0\u4e3a<code>MessageQueue<\/code>\u662f<code>Message<\/code>\u94fe\u8868\u96c6\u5408\uff0c\u6240\u4ee5\u4e24\u8005\u5173\u7cfb\u4e3a\uff1a\u4e00\u4e2a<code>MessageQueue<\/code>\u5bf9\u5e94\u591a\u4e2a<code>Message<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u521b\u5efaMessageQueue<\/h2>\n<p>\u60f3\u8981<strong>\u4f7f\u7528<\/strong><code>MessageQueue<\/code>\uff0c\u9996\u5148\u9700\u8981<strong>\u521b\u5efa<\/strong><code>MessageQueue<\/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 MessageQueue()<\/h3>\n<p><strong>MessageQueue\u7c7b<\/strong><\/p>\n<pre><code class=\"language-java\">MessageQueue(boolean quitAllowed) {\n    \/\/ \u8bb0\u5f55\u662f\u5426\u5141\u8bb8\u9000\u51fa\n    mQuitAllowed = quitAllowed;\n    \/\/ \u521d\u59cb\u5316native\u5c42\u7684\u6d88\u606f\u961f\u5217\uff0c\u5e76\u8bb0\u5f55\u5176\u8fd4\u56de\u6307\u9488\u3002\n    mPtr = nativeInit();\n}\n<\/code><\/pre>\n<p><code>MessageQueue<\/code>\u6784\u9020\u65b9\u6cd5\uff0c\u4e3a<strong>\u9ed8\u8ba4<\/strong>\u7684\uff0c\u53ea\u80fd<strong>\u540c\u5305\u4e0b<\/strong>\u8c03\u7528\uff0c\u76ee\u524d<strong>\u53ea\u6709<\/strong>\u7684<code>Looper<\/code><strong>\u521b\u5efa<\/strong>\u65f6\u8c03\u7528\u4e86\uff0c\u6211\u4eec\u6765\u770b\u4e0b<code>Looper<\/code>\u7684\u521b\u5efa\u3002<\/p>\n<p><strong>Looper\u6784\u9020\u65b9\u6cd5<\/strong><\/p>\n<pre><code class=\"language-java\">private Looper(boolean quitAllowed) {\n    mQueue = new MessageQueue(quitAllowed); \/\/ \u521b\u5efa\u6d88\u606f\u961f\u5217\n    mThread = Thread.currentThread();\n}\n<\/code><\/pre>\n<p>\u521b\u5efa<code>Looper<\/code>\uff0c\u53ef\u4ee5\u901a\u8fc7<code>Looper.prepare()<\/code>\u65b9\u6cd5\u521b\u5efa<strong>\u975e\u4e3b\u7ebf\u7a0b<\/strong><code>Looper<\/code>\uff0c\u5b83\u662f<strong>\u5141\u8bb8\u9000\u51fa<\/strong>\u7684\uff1b\u53ef\u4ee5\u901a\u8fc7<code>Looper.prepareMainLooper()<\/code>\u65b9\u6cd5\u521b\u5efa<strong>\u4e3b\u7ebf\u7a0b<\/strong><code>Looper<\/code>\uff0c\u5b83\u662f<strong>\u4e0d\u5141\u8bb8\u9000\u51fa<\/strong>\u7684\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Looper<\/code>\u521b\u5efa\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976341056585742#heading-2\">Android-Handler\u6e90\u7801\u89e3\u6790-Looper-\u521b\u5efaLooper<\/a>\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><code>MessageQueue<\/code>\u7684<strong>\u521b\u5efa<\/strong>\uff0c\u53ea\u80fd\u901a\u8fc7<code>Looper.prepare()<\/code>\u521b\u5efa<code>Looper<\/code>\u65f6\u8fdb\u884c<strong>\u521b\u5efa<\/strong>\u3002<strong>\u4e3b\u7ebf\u7a0b<\/strong><code>Looper<\/code>\uff0c\u5b83\u662f<strong>\u4e0d\u5141\u8bb8\u9000\u51fa<\/strong>\u7684\uff1b<strong>\u975e\u4e3b\u7ebf\u7a0b<\/strong><code>Looper<\/code>\uff0c\u5b83\u662f<strong>\u5141\u8bb8\u9000\u51fa<\/strong>\u7684\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u5165\u961fMessage<\/h2>\n<p>\u5f53\u901a\u8fc7<code>Handler<\/code><strong>\u53d1\u9001\u6d88\u606f<\/strong>\u7684\u65f6\u5019\uff0c\u6700\u7ec8\u4f1a\u8c03\u7528<code>MessageQueue<\/code>\u7684<code>enqueueMessage()<\/code>\u65b9\u6cd5\u5c06<code>Message<\/code><strong>\u5165\u961f<\/strong>\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u3002<\/p>\n<p><strong>Handler->enqueueMessage()<\/strong><\/p>\n<pre><code class=\"language-java\">private boolean enqueueMessage(@NonNull MessageQueue queue, @NonNull Message msg,\n        long uptimeMillis) {\n    msg.target = this;\n    msg.workSourceUid = ThreadLocalWorkSource.getUid();\n\n    if (mAsynchronous) {\n        msg.setAsynchronous(true);\n    }\n    \/\/ \u8c03\u7528MessageQueue\u7684enqueueMessage()\u65b9\u6cd5\u5165\u961f\u6d88\u606f\n    return queue.enqueueMessage(msg, uptimeMillis);\n}\n<\/code><\/pre>\n<p>\u5f53<code>Handler<\/code><strong>\u53d1\u9001\u6d88\u606f<\/strong>\u7684\u65f6\u5019\uff0c\u6700\u7ec8\u90fd\u4f1a\u8d70\u5230\u6b64<code>Handler<\/code>\u7684<code>enqueueMessage()<\/code>\u65b9\u6cd5\uff0c\u6700\u7ec8\u90fd\u662f\u8c03\u7528<code>MessageQueue<\/code>\u7684<code>enqueueMessage()<\/code>\u65b9\u6cd5\u8fdb\u884c<strong>\u5165\u961f\u6d88\u606f<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Handler<\/code>\u53d1\u9001\u6d88\u606f\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976728538972190#heading-11\">Android-Handler\u6e90\u7801\u89e3\u6790-Handler-\u53d1\u9001Message<\/a>\u3002\n<\/p><\/blockquote>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6765\u770b\u4e0b<code>MessageQueue<\/code>\u7684<code>enqueueMessage()<\/code>\u65b9\u6cd5\u3002<\/p>\n<h3>enqueueMessage()<\/h3>\n<pre><code class=\"language-java\">boolean enqueueMessage(Message msg, long when) {\n    if (msg.target == null) {\n        \/\/ \u6d88\u606f\u7684\u76ee\u6807Handler\u4e3a\u7a7a\uff0c\u629b\u51fa\u5f02\u5e38\u3002\n        throw new IllegalArgumentException(\"Message must have a target.\");\n    }\n    \/\/ \u52a0\u9501\uff0c\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3a\u5165\u961fMessage\u64cd\u4f5c\uff08handler.send\/post\uff09\u53ef\u4ee5\u5728\u4efb\u4f55\u7ebf\u7a0b\u8c03\u7528\u3002\n    synchronized (this) {\n        if (msg.isInUse()) {\n            \/\/ \u6d88\u606f\u6b63\u5728\u7528\uff08\u672a\u88ab\u56de\u6536\uff09\uff0c\u518d\u7528\u5219\u629b\u51fa\u5f02\u5e38\u3002\n            throw new IllegalStateException(msg + \" This message is already in use.\");\n        }\n\n        if (mQuitting) {\n            \/\/ \u9000\u51fa\u4e2d\uff0c\u518d\u5165\u961f\uff0c\u5219Log\u8b66\u544a\u63d0\u793a\uff0c\u5e76\u56de\u6536\u6d88\u606f\u3002\n            IllegalStateException e = new IllegalStateException(\n                    msg.target + \" sending message to a Handler on a dead thread\");\n            Log.w(TAG, e.getMessage(), e);\n            \/\/ \u56de\u6536\u6d88\u606f\n            msg.recycle();\n            return false;\n        }\n\n        msg.markInUse(); \/\/ \u6807\u8bb0\u6d88\u606f\u6b63\u5728\u4f7f\u7528\n        msg.when = when; \/\/ \u66f4\u65b0\u6d88\u606f\u7684when\u65f6\u523b\n        Message p = mMessages; \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3a\u6d88\u606f\u961f\u5217\u7684Head\u5143\u7d20\u3002\n        boolean needWake; \/\/ \u662f\u5426\u9700\u8981\u5524\u9192\u7ebf\u7a0b\n        if (p == null || when == 0 || when &lt; p.when) {\n            \/\/ \u5c06Message\u63d2\u5165\u5230\u961f\u9996\uff0c\u5982\u679c\u963b\u585e\uff0c\u5219\u5524\u9192\u4e8b\u4ef6\u961f\u5217\u3002\n            \/\/ \u8bf4\u660e\uff1a\n            \/\/ p == null\uff0c\u8bf4\u660e\u5934\u4e3a\u7a7a\uff0c\u961f\u5217\u4e3a\u7a7a\u3002\n            \/\/ when == 0\uff0c\u8bf4\u660e\u9700\u8981\u6392\u5728\u961f\u5217\u524d\u9762\uff08handler.sendMessageAtFrontOfQueue()\u65b9\u6cd5\u8c03\u7528\u4f20\u5165\uff09\u3002\n            \/\/ when &lt; p.when\uff0c\u8bf4\u660e\u6b64Message\u7684\u6267\u884c\u65f6\u523b\u6bd4Head\u7684\u65e9\uff0c\u6240\u4ee5\u8981\u5c06Message\u63d2\u5165\u5230\u961f\u9996\u3002(Message\u7684\u6267\u884c\u65f6\u523b\u8d8a\u665a\uff0c\u8d8a\u5728\u961f\u5217\u4e0b\u9762)\n\n            msg.next = p; \/\/ \u6b64Message\u94fe\u63a5Head\uff08\u5c06\u6b64Message\u63d2\u5165\u5230\u961f\u9996\uff09\n            mMessages = msg; \/\/ Head\u4e3a\u6b64Message\n            needWake = mBlocked; \/\/ \u5982\u679c\u963b\u585e\uff0c\u5219\u5524\u9192\u3002\n\n            if (p == null) {\n                \/\/ \u961f\u5217\u4e3a\u7a7a\uff0c\u94fe\u8868\u5c3e\u90e8\u4e3a\u6b64Message\u3002\n                mLast = mMessages;\n            }\n        } else {\n            \/\/ \u5c06Message\u63d2\u5165\u5230\u961f\u5c3e\u6216\u4e2d\u95f4\uff08\u961f\u5217\u6709\u6570\u636e\uff0c\u5e76\u4e14\u975e\u5f3a\u5236\u6392\u5728\u524d\u9762\uff0c\u5e76\u4e14\u6b64Message\u7684\u6267\u884c\u65f6\u523b\u6bd4Head\u7684\u665a\uff09\n            \/\/ \u901a\u5e38\u6211\u4eec\u4e0d\u9700\u8981\u5524\u9192\u4e8b\u4ef6\u961f\u5217\uff0c\u9664\u975e\u5728\u961f\u5217\u7684\u5934\u90e8\u6709\u4e00\u4e2abarrier\u5c4f\u969c\uff0c\u5e76\u4e14\u8be5\u6d88\u606f\u662f\u961f\u5217\u4e2d\u6700\u65e9\u7684\u5f02\u6b65\u6d88\u606f\u3002\n\n            \/\/ \u963b\u585e\uff0c\u5e76\u4e14\u961f\u5934(p)\u662f\u540c\u6b65\u5c4f\u969c\u6d88\u606f\uff0c\u5e76\u4e14\u8981\u52a0\u5165\u7684\u6d88\u606f(msg)\u662f\u5f02\u6b65\u6d88\u606f\uff0c\u5219\u5524\u9192\u3002\n            needWake = mBlocked &amp;&amp; p.target == null &amp;&amp; msg.isAsynchronous();\n\n            if (Flags.messageQueueTailTracking()) {\n                \/\/ \u542f\u7528\u4e86\u5c3e\u90e8tracking\n                if (when &gt;= mLast.when) {\n                    \/\/ \u5927\u4e8e\u961f\u5c3e\u7684\u65f6\u523b\uff0c\u5c06Message\u63d2\u5165\u5230\u961f\u5c3e\u3002\n                    needWake = needWake &amp;&amp; mAsyncMessageCount == 0;\n                    msg.next = null; \/\/ \u6e05\u7a7a\u6b64Message\u7684\u4e0b\u4e00\u4e2a\n                    mLast.next = msg; \/\/ Last\u94fe\u63a5\u6b64Message\n                    mLast = msg; \/\/ Last\u4e3a\u6b64Message\n                } else {\n                    \/\/ \u5c0f\u4e8e\u7b49\u4e8e\u961f\u5c3e\u7684\u65f6\u523b\uff0c\u5c06Message\u63d2\u5165\u5230\u961f\u4e2d\u95f4\u3002\n                    Message prev; \/\/ \u4e0a\u4e00\u4e2a\u5143\u7d20\n                    \/\/ \u904d\u5386\u961f\u5217\uff0c\u627e\u5230 Message \u76ee\u6807\u63d2\u5165\u4f4d\u7f6e\n                    for (; ; ) {\n                        prev = p; \/\/ \u4e0a\u4e00\u4e2a\u5143\u7d20\u7b49\u4e8e\u5f53\u524d\u5143\u7d20\n                        p = p.next; \/\/ \u5f53\u524d\u5143\u7d20\u7b49\u4e8e\u4e0b\u4e2a\u5143\u7d20\uff0c\u65b9\u4fbf\u4e0b\u6b21\u5faa\u73af\u3002\n                        if (p == null || when &lt; p.when) {\n                            \/\/ \u627e\u5230\u4f4d\u7f6e\uff0c\u9000\u51fa\u5faa\u73af\u3002\n                            \/\/ \u8bf4\u660e\uff1a\n                            \/\/ p == null\uff0c\u8bf4\u660e\u4e0b\u4e2a\u5143\u7d20\u4e3a\u7a7a\uff0c\u5230\u961f\u5c3e\u4e86\u3002\n                            \/\/ when &lt; p.when\uff0c\u8bf4\u660e\u6b64Message\u7684\u6267\u884c\u65f6\u523b\u6bd4\u4e0b\u4e2a\u5143\u7d20\u7684\u65e9\uff0c\u53c8\u56e0\u4e3a\u961f\u5217Message\u7684\u6267\u884c\u65f6\u523b\u662f\u4e00\u76f4\u53d8\u5927\u7684\uff0c\u6240\u4ee5\u4ece\u9876\u90e8\u627e\u5230\u7b2c\u4e00\u4e2a\u6ee1\u8db3\u5c0f\u4e8e\u7684\uff0c\u5373\u4e3a\u8981\u63d2\u5165\u7684\u4f4d\u7f6e\u3002\n                            break;\n                        }\n                        if (needWake &amp;&amp; p.isAsynchronous()) {\n                            \/\/ \u9700\u8981\u5524\u9192\uff0c\u5e76\u4e14\u4e0b\u4e2a\u6d88\u606f\u662f\u5f02\u6b65\u6d88\u606f\uff0c\u5219\u4e0d\u9700\u8981\u5524\u9192\u3002\n                            needWake = false;\n                        }\n                    }\n                    if (p == null) {\n                        \/\/ \u5728\u961f\u5c3e\uff0c\u8bb0\u5f55\u5c3e\u90e8\u6d88\u606f\u3002\n                        mLast = msg;\n                    }\n                    \/\/ \u5c06Message\u63d2\u5165\u961f\u5217\u7684\u76ee\u6807\u4f4d\u7f6e\n                    msg.next = p;\n                    prev.next = msg;\n                }\n            } else {\n                \/\/ \u672a\u542f\u7528\u4e86\u5c3e\u90e8tracking\n                \/\/ \u903b\u8f91\u540c\u4e0a\u9762\u7684\u3010\u5c0f\u4e8e\u7b49\u4e8e\u961f\u5c3e\u7684\u65f6\u523b\uff0c\u5c06Message\u63d2\u5165\u5230\u961f\u4e2d\u95f4\u3011else\u7684\u903b\u8f91\uff0c\u552f\u4e00\u7684\u533a\u522b\u662f\u4e0b\u9762\u7684mLast=null\u3002\n                Message prev;\n                for (; ; ) {\n                    prev = p;\n                    p = p.next;\n                    if (p == null || when &lt; p.when) {\n                        break;\n                    }\n                    if (needWake &amp;&amp; p.isAsynchronous()) {\n                        needWake = false;\n                    }\n                }\n                msg.next = p;\n                prev.next = msg;\n\n                mLast = null;\n            }\n        }\n\n        if (msg.isAsynchronous()) {\n            \/\/ \u662f\u5f02\u6b65\u6d88\u606f\uff0c\u8bb0\u5f55\u5f02\u6b65\u6d88\u606f\u6570\u91cf\u3002\n            mAsyncMessageCount++;\n        }\n\n        \/\/ \u662f\u5426\u9700\u8981\u5524\u9192Native\u4fa7\u7684MessageQueue\n        if (needWake) {\n            \/\/ \u5524\u9192\n            nativeWake(mPtr);\n        }\n    }\n    return true;\n}\n<\/code><\/pre>\n<p><code>enqueueMessage()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5411<strong>\u6b64<\/strong><code>MessageQueue<\/code>\u4e2d<strong>\u5165\u961f\u6d88\u606f<\/strong>\uff0c\u5e76\u5224\u65ad<strong>\u662f\u5426<\/strong>\u9700\u8981<strong>\u5524\u9192<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u5728<code>Looper<\/code><strong>\u9000\u51fa<\/strong>\u540e\uff0c\u518d\u5411<code>MessageQueue<\/code><strong>\u5165\u961f\u6d88\u606f<\/strong>\u5c06<strong>\u4e0d\u518d\u5165\u961f<\/strong>\uff0c\u5e76\u8fd4\u56de<code>false<\/code>\u3002<br \/>\n  2. <strong>\u5165\u961f<\/strong><code>Message<\/code>\uff0c\u662f\u6309<code>Message<\/code>\u7684<code>when<\/code><strong>\u5347\u5e8f<\/strong>\u8fdb\u884c<strong>\u5165\u961f<\/strong>\uff08\u5982\u679c<code>when<\/code>\u76f8\u540c\uff0c\u6309<strong>\u5165\u961f<\/strong>\u5148\u540e\u987a\u5e8f\uff09\uff0c<strong>\u9664\u975e<\/strong>\u8c03\u7528<code>handler.sendMessageAtFrontOfQueue()<\/code>\u65b9\u6cd5<strong>\u5f3a\u5236<\/strong>\u5c06\u6d88\u606f<strong>\u5165\u961f<\/strong>\u5230<strong>\u6d88\u606f\u961f\u5217\u9876\u90e8<\/strong>\u3002<br \/>\n  3. <strong>\u5165\u961f<\/strong><code>Message<\/code>\uff0c\u9700\u8981<strong>\u5224\u65ad<\/strong>\u662f\u5426\u9700\u8981<strong>\u5524\u9192<\/strong>\uff0c\u56e0\u4e3a<strong>\u6b64\u7ebf\u7a0b<\/strong>\u4e4b\u524d\u53ef\u80fd<strong>\u8fdb\u5165\u963b\u585e<\/strong>\uff0c<strong>\u518d\u5165\u961f\u6d88\u606f<\/strong>\uff0c\u5e94\u8be5<strong>\u5524\u9192<\/strong>\u7136\u540e<strong>\u6267\u884c<\/strong>\u6b64\u6d88\u606f\uff0c<strong>\u5524\u9192\u540e<\/strong>\u7684\u64cd\u4f5c\u770b\u540e\u9762\u7684-<a href=\"#\u83b7\u53d6message\">\u83b7\u53d6Message<\/a>\u3002<br \/>\n  4.  <strong>\u5165\u961f<\/strong><code>Message<\/code>\uff0c\u5e76\u4e0d\u662f<strong>\u7acb\u5373\u6267\u884c<\/strong>\uff0c\u5982\u679c\u662f<strong>\u7acb\u5373\u6d88\u606f<\/strong>\uff0c\u5219\u662f<strong>\u7b49\u5f85<\/strong>\u6b64\u6d88\u606f<strong>\u4e4b\u524d\u7684\u6d88\u606f<\/strong>\uff08<strong>\u5c0f\u4e8e\u7b49\u4e8e<\/strong><code>when<\/code>\uff0c<strong>\u5c0f\u4e8e<\/strong>\u8bf4\u660e\u4e4b\u524d\u7684\u6d88\u606f\u5904\u7406\u65f6<strong>\u8017\u65f6<\/strong>\u963b\u585e\u4e86\uff0c<strong>\u7b49\u4e8e<\/strong>\u8bf4\u660e\u6b64\u6d88\u606f\u52a0\u5165\u7684<strong>\u665a<\/strong>\uff09<strong>\u5904\u7406\u5b8c<\/strong>\uff1b\u5982\u679c\u662f<strong>\u5ef6\u65f6\u6d88\u606f<\/strong>\uff0c\u5219\u662f<strong>\u7b49\u5f85<\/strong>\u65f6\u95f4\u5230\u4e86\u4fbf\u4f1a\u6267\u884c\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><strong>\u5165\u961f<\/strong><code>Message<\/code>\uff0c\u662f\u6309<code>Message<\/code>\u7684<code>when<\/code><strong>\u5347\u5e8f<\/strong>\u8fdb\u884c<strong>\u5165\u961f<\/strong>\uff08\u5982\u679c<code>when<\/code>\u76f8\u540c\uff0c\u6309<strong>\u5165\u961f<\/strong>\u5148\u540e\u987a\u5e8f\uff09\uff0c<strong>\u9664\u975e<\/strong>\u8c03\u7528<code>handler.sendMessageAtFrontOfQueue()<\/code>\u65b9\u6cd5<strong>\u5f3a\u5236<\/strong>\u5c06\u6d88\u606f<strong>\u5165\u961f<\/strong>\u5230<strong>\u6d88\u606f\u961f\u5217\u9876\u90e8<\/strong>\u3002<\/li>\n<li>\u5728<code>Looper<\/code><strong>\u9000\u51fa<\/strong>\u540e\uff0c\u518d\u5411<code>MessageQueue<\/code><strong>\u5165\u961f\u6d88\u606f<\/strong>\u5c06<strong>\u4e0d\u518d\u5165\u961f<\/strong>\uff0c\u5e76\u8fd4\u56de<code>false<\/code>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u540c\u6b65\u5c4f\u969c<\/h2>\n<p>\u6267\u884c<strong>\u4f18\u5148\u7ea7\u9ad8<\/strong>\u7684<code>Message<\/code>\uff0c\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528<code>handler.sendMessageAtFrontOfQueue()<\/code>\u65b9\u6cd5<strong>\u5f3a\u5236<\/strong>\u5c06\u6d88\u606f<strong>\u5165\u961f<\/strong>\u5230<strong>\u6d88\u606f\u961f\u5217\u9876\u90e8<\/strong>\uff0c\u4f46\u662f\u8fd9\u6837<strong>\u4e0d\u80fd\u4fdd\u8bc1<\/strong>\u6b64\u6d88\u606f<strong>\u5165\u961f\u540e<\/strong>\u5230<strong>\u6267\u884c\u524d<\/strong>\u5176\u5b83\u6d88\u606f\u6ca1\u6709\u7ee7\u7eed\u5165\u961f\u5230<strong>\u961f\u5217\u9876\u90e8<\/strong>\uff0c\u8fd9\u6837\u5c31\u4e0d\u80fd\u4fdd\u8bc1<strong>\u9996\u5148\u6267\u884c<\/strong>\u3002<\/p>\n<p>\u4f7f\u7528<strong>\u540c\u6b65\u5c4f\u969c<\/strong>\u5373\u53ef\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <strong>\u6d88\u606f<\/strong>\u5206\u4e3a<strong>\u540c\u6b65\u6d88\u606f<\/strong>\uff08<code>Message<\/code>\u7684<code>isAsynchronous()<\/code>\u4e3a<code>false<\/code>\uff09\u3001<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\uff08<code>Message<\/code>\u7684<code>isAsynchronous()<\/code>\u4e3a<code>true<\/code>\uff09\u3002<br \/>\n  2. <strong>\u540c\u6b65\u5c4f\u969c<\/strong>\u4f1a\u5c4f\u969c<strong>\u540c\u6b65\u6d88\u606f<\/strong>\uff0c\u53ea\u5141\u8bb8<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\u6267\u884c\u3002<br \/>\n  3. <strong>\u540c\u6b65\u5c4f\u969c<\/strong>\u529f\u80fd\uff0c\u4f7f\u7528<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff08<code>Message<\/code>\u7684<code>target<\/code>\u4e3a<code>null<\/code>\uff09\u6765\u5b9e\u73b0\u3002\n<\/p><\/blockquote>\n<h3>postSyncBarrier()<\/h3>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic int postSyncBarrier() {\n    return postSyncBarrier(SystemClock.uptimeMillis());\n}\n<\/code><\/pre>\n<pre><code class=\"language-java\">private int postSyncBarrier(long when) {\n    \/\/ \u5165\u961f\u4e00\u4e2a\u65b0\u7684\u540c\u6b65\u5c4f\u969ctoken\u3002\n    \/\/ \u6211\u4eec\u4e0d\u9700\u8981\u5524\u9192\u961f\u5217\uff0c\u56e0\u4e3a\u5c4f\u969c\u7684\u76ee\u7684\u662f\u8ba9\u5b83\u505c\u6ede\u3002\n\n    \/\/ \u540c\u6b65\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3a\u53ef\u80fd\u5728\u4efb\u610f\u7ebf\u7a0b\u8c03\u7528\u6b64\u65b9\u6cd5\u3002\n    synchronized (this) {\n        \/\/ \u540c\u6b65\u5c4f\u969c\u6d88\u606f\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u7528token\u533a\u5206\uff0ctoken\u901a\u8fc7mNextBarrierToken\u7d2f\u52a0\u7ef4\u62a4\u3002\n        final int token = mNextBarrierToken++;\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u540c\u6b65\u5c4f\u969c\u6d88\u606f\uff08target\u4e3anull\uff09\n        final Message msg = Message.obtain();\n        msg.markInUse(); \/\/ \u6807\u8bb0\u6d88\u606f\u5728\u7528\n        msg.when = when; \/\/ \u8bb0\u5f55\u6267\u884c\u65f6\u523b\n        msg.arg1 = token; \/\/ \u8bb0\u5f55token\n\n        if (Flags.messageQueueTailTracking() &amp;&amp; mLast != null &amp;&amp; mLast.when &lt;= when) {\n            \/\/ \u542f\u7528\u4e86\u5c3e\u90e8tracking\uff0c\u5e76\u4e14\u6700\u540e\u4e00\u4e2aMessage\u7684\u6267\u884c\u65f6\u523b\u5c0f\u4e8e\u6b64\u6d88\u606f\u7684\u6267\u884c\u65f6\u523b\uff0c\u5219\u63d2\u5165Message\u5230\u961f\u5c3e\uff0c\u5e76\u8fd4\u56de\u3002\n            mLast.next = msg; \/\/ \u5c3e\u94fe\u63a5\n            mLast = msg; \/\/ \u8bb0\u5f55\u5c3e\n            msg.next = null; \/\/ \u65ad\u5f00\n            return token;\n        }\n\n        \/\/ \u6839\u636ewhen\u6392\u5e8f\u627e\u5230\u63d2\u5165\u4f4d\u7f6e\u3002\n        Message prev = null; \/\/ \u4e0a\u4e2a\u6d88\u606f\n        Message p = mMessages; \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3aHead\u3002\n        if (when != 0) {\n            while (p != null &amp;&amp; p.when &lt;= when) {\n                \/\/ \u5f53\u524d\u4e0d\u4e3a\u7a7a\uff0c\u5e76\u4e14\u5f53\u524d\u65f6\u523b\u5c0f\u4e8e\u76ee\u6807\u65f6\u523b\uff0c\u7ee7\u7eed\u67e5\u627e\u3002\n                prev = p; \/\/ \u4e0a\u4e2a\u4e3a\u5f53\u524d\n                p = p.next; \/\/ \u5f53\u524d\u4e3a\u4e0b\u4e2a\uff0c\u4ee5\u4fbf\u5faa\u73af\u3002\n            }\n        }\n\n        if (p == null) {\n            \/\/ \u5230\u8fbe\u4e86\u5217\u8868\u7684\u5c3e\u90e8\uff0c\u6216\u8005\u5217\u8868\u4e3a\u7a7a\uff0c\u8bb0\u5f55\u5c3e\u3002\n            mLast = msg;\n        }\n\n        \/\/ \u8fdb\u884c\u63d2\u5165\n        if (prev != null) {\n            \/\/ \u8fdb\u5165\u4e86while\u5faa\u73af\uff0c\u627e\u5230\u4e86\u4f4d\u7f6e\uff0c\u5c06\u6d88\u606f\u5728\u6b64\u4f4d\u7f6e\u63d2\u5165\u3002\n            msg.next = p;\n            prev.next = msg;\n        } else {\n            \/\/ \u672a\u8fdb\u5165while\u5faa\u73af\uff0c\u672a\u627e\u5230\u4e86\u4f4d\u7f6e\uff0c\u5c06\u6d88\u606f\u5728\u961f\u9996\u63d2\u5165\u3002\n            \/\/ \u672a\u8fdb\u5165while\u5faa\u73af\uff0c\u8bf4\u660e\uff1a\u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u961f\u91cc\u7684\u6240\u6709Message\u65f6\u523b\u90fd\u6bd4\u5c4f\u969cMessage\u8981\u665a\u3002\n            msg.next = p;\n            mMessages = msg;\n        }\n        \/\/ \u8fd4\u56detoke\uff0c\u4e3a\u4e86\u79fb\u9664\u7528\u3002\n        return token;\n    }\n}\n<\/code><\/pre>\n<p><code>postSyncBarrier()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5411<strong>\u6b64<\/strong><code>MessageQueue<\/code>\u4e2d<strong>\u5165\u961f\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff0c\u5e76\u8fd4\u56de<code>token<\/code>\u7528\u4e8e<strong>\u79fb\u9664\u6b64\u540c\u6b65\u5c4f\u969c<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>postSyncBarrier()<\/code>\u65b9\u6cd5\u4e3a<code>@hide<\/code>\uff0c\u53ea\u80fd<strong>\u7cfb\u7edf<\/strong>\u8c03\u7528\uff1b<code>postSyncBarrier(long)<\/code>\u65b9\u6cd5\u4e3a<code>private<\/code>\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u80fd\u901a\u8fc7<strong>\u53cd\u5c04<\/strong>\u6765\u8c03\u7528\u3002<br \/>\n  2. <strong>\u521b\u5efa<\/strong>\u4e00\u4e2a<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff08<code>Message<\/code>\u7684<code>target<\/code>\u4e3a<code>null<\/code>\uff09\uff0c\u6309\u7167<code>when<\/code><strong>\u6392\u5e8f<\/strong>\u8fdb\u884c<strong>\u63d2\u5165<\/strong>\uff0c<strong>\u4fdd\u8bc1<\/strong>\u4e86<strong>\u961f\u5217\u6709\u5e8f<\/strong>\u3002<br \/>\n  3. <strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u53ef<strong>\u5165\u961f\u591a\u4e2a<\/strong>\uff0c\u901a\u8fc7<code>token<\/code>\u6765\u533a\u5206\uff0c\u901a\u8fc7\u6b64\u53ef\u7528\u6765<strong>\u79fb\u9664<\/strong>\u3002<br \/>\n  4. <strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u53ea<strong>\u5c4f\u969c<\/strong>\u6b64<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong><code>when<\/code>\u65f6\u523b<strong>\u540e\u9762<\/strong>\u7684\u6d88\u606f\uff0c<code>when<\/code>\u65f6\u523b<strong>\u524d\u9762<\/strong>\u7684\u4f1a\u4f9d\u6b21\u6267\u884c\uff0c\u8be6\u7ec6\u89c1\u540e\u9762\u7684-<a href=\"#\u83b7\u53d6message\">\u83b7\u53d6Message<\/a>\u3002<br \/>\n  5. <strong>\u540c\u6b65\u5c4f\u969c<\/strong>\u529f\u80fd\u6d41\u7a0b\uff1a1.<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u5165\u961f\uff0c2.<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\u5165\u961f\uff0c\u4ee5\u5b8c\u6210\u6b64\u5f02\u6b65\u6d88\u606f<strong>\u4f18\u5148\u7ea7\u6700\u9ad8\u6267\u884c<\/strong>\u529f\u80fd\uff0c3.<strong>\u79fb\u9664<\/strong>\u6b64<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff0c\u5426\u5219\u6b64<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u5165\u961f<strong>\u4e4b\u540e<\/strong>\u7684<strong>\u540c\u6b65\u6d88\u606f<\/strong>\u6c38\u8fdc<strong>\u4e0d\u4f1a\u6267\u884c<\/strong>\uff0c\u8be6\u7ec6\u89c1\u540e\u9762\u7684-<a href=\"#\u83b7\u53d6message\">\u83b7\u53d6Message<\/a>\u3002\n<\/p><\/blockquote>\n<p><strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u5165\u961f\u540e\uff0c\u9700\u8981\u8fdb\u884c\u8c03\u7528<code>removeSyncBarrier(int)<\/code>\u79fb\u9664\uff0c\u5426\u5219\u6b64<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong><code>when<\/code>\u65f6\u523b<strong>\u540e\u9762<\/strong>\u7684\u6d88\u606f\u6c38\u8fdc<strong>\u4e0d\u4f1a\u6267\u884c<\/strong>\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u3002<\/p>\n<h3>removeSyncBarrier()<\/h3>\n<pre><code class=\"language-java\">\/** @hide *\/\npublic void removeSyncBarrier(int token) {\n    \/\/ \u4ece\u961f\u5217\u4e2d\u5220\u9664\u540c\u6b65\u5c4f\u969ctoken\u3002\n    \/\/ \u5982\u679c\u961f\u5217\u4e0d\u518d\u88ab\u5c4f\u969c\u963b\u788d\uff0c\u90a3\u4e48\u5524\u9192\u5b83\u3002\n    synchronized (this) {\n        Message prev = null; \/\/ \u4e0a\u4e2a\u6d88\u606f\n        Message p = mMessages; \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3aHead\u3002\n        \/\/ \u904d\u5386\u961f\u5217\u627e\u5230\u6b64token\u7684\u5c4f\u969cMessage\n        while (p != null &amp;&amp; (p.target != null || p.arg1 != token)) {\n            \/\/ \u5f53\u524d\u4e0d\u4e3a\u7a7a\uff0c\u5e76\u4e14\u5f53\u524d\u7684\u4e0d\u662f\u540c\u6b65\u5c4f\u969c\u6d88\u606f\u6216\u8005\u662f\u540c\u6b65\u5c4f\u969c\u6d88\u606f\u4f46\u662ftoken\u4e0d\u76f8\u7b49\uff0c\u7ee7\u7eed\u67e5\u627e\u3002\n            prev = p;\n            p = p.next;\n        }\n        if (p == null) {\n            \/\/ \u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u5230\u672b\u5c3e\u4e86\u6ca1\u627e\u5230\uff0c\u629b\u51fa\u5f02\u5e38\uff08\u6307\u5b9a\u7684\u6d88\u606f\u961f\u5217\u540c\u6b65\u5c4f\u969ctoken\u5c1a\u672a\u53d1\u5e03\u6216\u5df2\u88ab\u5220\u9664\uff09\u3002\n            throw new IllegalStateException(\"The specified message queue synchronization \"\n                    + \" barrier token has not been posted or has already been removed.\");\n        }\n        final boolean needWake; \/\/ \u662f\u5426\u9700\u8981\u5524\u9192\n        \/\/ \u8fdb\u884c\u79fb\u9664\n        if (prev != null) {\n            \/\/ \u8fdb\u5165\u4e86while\u5faa\u73af\uff0c\u627e\u5230\u4e86\u4f4d\u7f6e\uff0c\u5c06\u6d88\u606f\u5728\u6b64\u4f4d\u7f6e\u79fb\u9664\u3002\n            prev.next = p.next; \/\/ \u79fb\u9664p\n\n            if (prev.next == null) {\n                \/\/ \u4e0b\u4e00\u4e2a\u4e3a\u7a7a\uff0c\u8bb0\u5f55\u5c3e\u3002\n                mLast = prev;\n            }\n\n            needWake = false; \/\/ \u4e0d\u9700\u8981\u5524\u9192\n        } else {\n            \/\/ \u672a\u8fdb\u5165while\u5faa\u73af\uff0c\u672a\u627e\u5230\u4e86\u4f4d\u7f6e\uff0c\u5c06\u6d88\u606f\u5728\u961f\u9996\u79fb\u9664\u3002\n            \/\/ \u672a\u8fdb\u5165while\u5faa\u73af\uff0c\u8bf4\u660e\uff1a\u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u961f\u9996\u5c31\u662f\u6b64\u540c\u6b65\u5c4f\u969c\u6d88\u606f\u3002\n            mMessages = p.next; \/\/ \u79fb\u9664p\n\n            if (mMessages == null) {\n                \/\/ \u961f\u5217\u4e3a\u7a7a\uff0c\u8bb0\u5f55\u5c3e\u3002\n                mLast = null;\n            }\n\n            \/\/ \u5982\u679c\u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u961f\u9996\u4e0d\u662f\u540c\u6b65\u5c4f\u969c\u6d88\u606f\uff0c\u5219\u5524\u9192\u3002\n            needWake = mMessages == null || mMessages.target != null;\n        }\n        \/\/ \u56de\u6536\u6d88\u606f\n        p.recycleUnchecked();\n\n        \/\/ \u5224\u65ad\u662f\u5426\u5e94\u8be5\u5524\u9192\uff0c\u5982\u679cloop\u9000\u51fa\uff08\u5df2\u7ecf\u9192\u4e86\uff09\uff0c\u4e0d\u9700\u8981\u518d\u5524\u9192\u3002\n        if (needWake &amp;&amp; !mQuitting) {\n            \/\/ \u5524\u9192\n            nativeWake(mPtr);\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>postSyncBarrier()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5411<strong>\u6b64<\/strong><code>MessageQueue<\/code>\u4e2d<strong>\u79fb\u9664<\/strong>\u6b64<code>token<\/code>\u7684<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>removeSyncBarrier(long)<\/code>\u65b9\u6cd5\u4e3a<code>@hide<\/code>\uff0c\u53ea\u80fd<strong>\u7cfb\u7edf<\/strong>\u8c03\u7528\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u80fd\u901a\u8fc7<strong>\u53cd\u5c04<\/strong>\u6765\u8c03\u7528\u3002<br \/>\n  2. \u5982\u679c<strong>\u6b64<\/strong><code>MessageQueue<\/code>\u4e2d\uff0c\u6ca1\u6709\u6b64<code>token<\/code>\u7684<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff0c\u5219\u629b\u51fa\u5f02\u5e38\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><strong>\u540c\u6b65\u5c4f\u969c<\/strong>\uff08<code>Message<\/code>\u7684<code>target<\/code>\u4e3a<code>null<\/code>\uff09\uff0c\u5c4f\u969c<strong>\u540c\u6b65\u6d88\u606f<\/strong>\uff0c\u53ea\u5141\u8bb8<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\u6267\u884c\uff0c\u4e3a\u4e86\u5b9e\u73b0\u6b64\u5f02\u6b65\u6d88\u606f<strong>\u4f18\u5148\u7ea7\u6700\u9ad8\u6267\u884c<\/strong>\u529f\u80fd\u3002<\/li>\n<li><strong>\u540c\u6b65\u5c4f\u969c<\/strong>\u529f\u80fd\u6d41\u7a0b\uff1a1.<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u5165\u961f\uff0c2.<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\u5165\u961f\uff0c\u4ee5\u5b8c\u6210\u6b64\u5f02\u6b65\u6d88\u606f<strong>\u4f18\u5148\u7ea7\u6700\u9ad8\u6267\u884c<\/strong>\u529f\u80fd\uff0c3.<strong>\u79fb\u9664<\/strong>\u6b64<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff0c\u5426\u5219\u6b64<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u5165\u961f<strong>\u4e4b\u540e<\/strong>\u7684<strong>\u540c\u6b65\u6d88\u606f<\/strong>\u6c38\u8fdc<strong>\u4e0d\u4f1a\u6267\u884c<\/strong>\uff0c\u8be6\u7ec6\u89c1\u540e\u9762\u7684-<a href=\"#\u83b7\u53d6message\">\u83b7\u53d6Message<\/a>\u3002<\/li>\n<li>\u8c03\u7528<code>postSyncBarrier()<\/code>\u65b9\u6cd5<strong>\u5165\u961f<\/strong>\u4e00\u4e2a<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a<code>token<\/code>\uff0c\u7528\u4e8e\u8c03\u7528 <code>removeSyncBarrier(long)<\/code>\u65b9\u6cd5<strong>\u79fb\u9664<\/strong>\u6b64<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u7528\uff0c\u4e24\u4e2a\u65b9\u6cd5\u90fd\u662f<code>@hide<\/code>\u65b9\u6cd5\uff0c\u53ea\u80fd\u901a\u8fc7<strong>\u53cd\u5c04<\/strong>\u6765\u8c03\u7528\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>IdleHandler<\/h2>\n<p>\u6267\u884c<strong>\u4f18\u5148\u7ea7\u4f4e<\/strong>\u7684\u4efb\u52a1\uff0c\u53ef\u4ee5\u4f7f\u7528<code>IdleHandler<\/code>\u5b9e\u73b0\uff0c\u5b83\u4f1a\u5728<code>MessageQueue<\/code><strong>\u7a7a\u95f2<\/strong>\u65f6\u8fdb\u884c\u6267\u884c\uff0c\u4ee5\u907f\u514d\u963b\u585eUI\u6d88\u606f\uff0c\u5bfc\u81f4\u9875\u9762\u5361\u987f\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u3002<\/p>\n<p><strong>IdleHandler\u7c7b<\/strong><\/p>\n<pre><code class=\"language-java\">public static interface IdleHandler {\n    \/\/ \u6d88\u606f\u961f\u5217\u7a7a\u95f2\uff0c\u8fd4\u56de\u503c\u4ee3\u8868\u6b64IdleHandler\u662f\u5426\u8fd8\u662f\u6d3b\u8dc3\u7684\uff0c\u8fd4\u56deture\u4ee3\u8868\u662f\u6d3b\u8dc3\u7684\uff0c\u8fd4\u56defalse\u4ee3\u8868\u662f\u975e\u6d3b\u8dc3\u7684\u3002\n    boolean queueIdle();\n}\n<\/code><\/pre>\n<p><code>IdleHandler<\/code>\u63a5\u53e3\u7684<code>queueIdle()<\/code>\u65b9\u6cd5\uff0c\u5f53<code>MessageQueue<\/code><strong>\u7a7a\u95f2<\/strong>\uff08\u961f\u5217\u4e3a\u7a7a\u6216\u8005\u961f\u5217\u91cc\u7684\u6d88\u606f\u5168\u90e8\u672a\u5230\u6267\u884c\u65f6\u523b\uff09\u65f6\u8fdb\u884c\u8c03\u7528\u901a\u77e5\uff0c\u5176<strong>\u8fd4\u56de\u503c<\/strong>\u4ee3\u8868\u6b64<code>IdleHandler<\/code>\u662f\u5426\u8fd8\u662f<strong>\u6d3b\u8dc3<\/strong>\u7684\uff0c\u8fd4\u56de<code>ture<\/code>\u4ee3\u8868\u662f<strong>\u6d3b\u8dc3<\/strong>\u7684\uff08\u4e0d\u5728<code>mIdleHandlers<\/code>\u4e2d<strong>\u79fb\u9664<\/strong>\uff09\uff0c\u8fd4\u56de<code>false<\/code>\u4ee3\u8868\u662f<strong>\u975e\u6d3b\u8dc3<\/strong>\u7684\uff08\u5728<code>mIdleHandlers<\/code>\u4e2d<strong>\u79fb\u9664<\/strong>\uff09\uff0c\u8be6\u7ec6\u89c1\u540e\u9762\u7684-<a href=\"#\u83b7\u53d6message\">\u83b7\u53d6Message<\/a>\u3002<\/p>\n<h3>addIdleHandler()<\/h3>\n<pre><code class=\"language-java\">public void addIdleHandler(@NonNull IdleHandler handler) {\n    if (handler == null) {\n        \/\/ IdleHandler\u4e3a\u7a7a\uff0c\u629b\u51fa\u5f02\u5e38\uff08\u4e0d\u80fd\u589e\u52a0 null IdleHandler\uff09\u3002\n        throw new NullPointerException(\"Can't add a null IdleHandler\");\n    }   \n    \/\/ \u540c\u6b65\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3a\u53ef\u80fd\u5728\u4efb\u610f\u7ebf\u7a0b\u8c03\u7528\u6b64\u65b9\u6cd5\u3002\n    synchronized (this) {\n        \/\/ \u5728mIdleHandlers\u4e2d\u6dfb\u52a0\n        mIdleHandlers.add(handler);\n    }\n}\n<\/code><\/pre>\n<p><code>addIdleHandler()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5728<code>mIdleHandlers<\/code><strong>\u6dfb\u52a0<\/strong><code>IdleHandler<\/code>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <strong>\u589e\u52a0<\/strong>\u7684<code>IdleHandler<\/code>\uff0c\u5982\u679c<strong>\u6ca1\u6709<\/strong>\u8fdb\u884c<strong>\u79fb\u9664<\/strong>\uff08\u672a\u8c03\u7528<code>removeIdleHandler()<\/code>\u65b9\u6cd5\u6216<code>queueIdle()<\/code>\u65b9\u6cd5\u8fd4\u56de<code>true<\/code>\uff09\uff0c\u5219\u59cb\u7ec8\u4f1a\u5728<code>MessageQueue<\/code><strong>\u7a7a\u95f2<\/strong>\u65f6\u8fdb\u884c\u8c03\u7528<strong>\u901a\u77e5<\/strong>\uff0c\u8be6\u7ec6\u89c1\u540e\u9762\u7684-<a href=\"#\u83b7\u53d6message\">\u83b7\u53d6Message<\/a>\u3002\n<\/p><\/blockquote>\n<h3>removeIdleHandler()<\/h3>\n<pre><code class=\"language-java\">public void removeIdleHandler(@NonNull IdleHandler handler) {\n    \/\/ \u540c\u6b65\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3a\u53ef\u80fd\u5728\u4efb\u610f\u7ebf\u7a0b\u8c03\u7528\u6b64\u65b9\u6cd5\u3002\n    synchronized (this) {\n        \/\/ \u5728mIdleHandlers\u4e2d\u79fb\u9664\n        mIdleHandlers.remove(handler);\n    }\n}\n<\/code><\/pre>\n<p><code>addIdleHandler()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5728<code>mIdleHandlers<\/code><strong>\u79fb\u9664<\/strong>\u6b64<code>IdleHandler<\/code>\u3002<\/p>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li><code>IdleHandler<\/code>\uff0c\u4e3a<code>MessageQueue<\/code><strong>\u7a7a\u95f2<\/strong>\uff08\u961f\u5217\u4e3a\u7a7a\u6216\u8005\u961f\u5217\u91cc\u7684\u6d88\u606f\u5168\u90e8\u672a\u5230\u6267\u884c\u65f6\u523b\uff09\u65f6\u8fdb\u884c\u6267\u884c\uff0c\u4e3a\u4e86\u5b9e\u73b0<strong>\u4f18\u5148\u7ea7\u6700\u4f4e\u6267\u884c<\/strong>\u529f\u80fd\u3002<\/li>\n<li>\u8c03\u7528<code>addIdleHandler()<\/code>\u65b9\u6cd5<strong>\u6dfb\u52a0<\/strong><code>IdleHandler<\/code>\uff0c\u8c03\u7528 <code>removeIdleHandler()<\/code>\u65b9\u6cd5<strong>\u79fb\u9664<\/strong>\u6b64<code>IdleHandler<\/code>\u3002<\/li>\n<li><strong>\u589e\u52a0<\/strong>\u7684<code>IdleHandler<\/code>\uff0c\u5982\u679c<strong>\u6ca1\u6709<\/strong>\u8fdb\u884c<strong>\u79fb\u9664<\/strong>\uff08\u672a\u8c03\u7528<code>removeIdleHandler()<\/code>\u65b9\u6cd5\u6216<code>queueIdle()<\/code>\u65b9\u6cd5\u8fd4\u56de<code>true<\/code>\uff09\uff0c\u5219\u59cb\u7ec8\u4f1a\u5728<code>MessageQueue<\/code><strong>\u7a7a\u95f2<\/strong>\u65f6\u8fdb\u884c\u8c03\u7528<strong>\u901a\u77e5<\/strong>\uff0c\u8be6\u7ec6\u89c1\u540e\u9762\u7684-<a href=\"#\u83b7\u53d6message\">\u83b7\u53d6Message<\/a>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u83b7\u53d6Message<\/h2>\n<p>\u5404\u79cd\u6d88\u606f\uff08<strong>\u540c\u6b65\u6d88\u606f<\/strong>\u3001<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\u3001<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff09\u88ab\u6dfb\u52a0\u5230<code>MessageQueue<\/code>\u540e\uff0c\u4fbf\u53ef\u4ee5\u83b7\u53d6\u4e86\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u770b\u4e0b\u5b83\u662f\u5982\u4f55\u88ab<strong>\u83b7\u53d6<\/strong>\u7684\u3002<\/p>\n<h3>next()<\/h3>\n<pre><code class=\"language-java\">@UnsupportedAppUsage\nMessage next() {\n    \/\/ \u5982\u679c\u6d88\u606floop\u5df2\u7ecf\u9000\u51fa\u5e76\u88ab\u9500\u6bc1\uff0c\u5219\u8fd4\u56de\u6b64\u5904\u3002\n    \/\/ \u5982\u679c\u5e94\u7528\u7a0b\u5e8f\u5728\u9000\u51fa\u540e\u5c1d\u8bd5\u91cd\u65b0\u542f\u52a8looper\uff0c\u5219\u53ef\u80fd\u4f1a\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\uff0c\u8fd9\u662f\u4e0d\u53d7\u652f\u6301\u7684\u3002\n    final long ptr = mPtr;\n    if (ptr == 0) {\n        \/\/ mPtr\u4e3a0\uff0c\u8bf4\u660eloop\u5df2\u7ecf\u9000\u51fa\u4e86\uff0c\u76f4\u63a5\u8fd4\u56denull\u3002\n        return null;\n    }\n\n    \/\/ \u5f85\u5904\u7406\u7684IdleHandler\u7684\u6570\u91cf\uff0c\u4e3a-1\u4ee3\u8868\u662f\u7b2c\u4e00\u6b21\u521d\u59cb\u5316\u7684\u72b6\u6001\u3002\n    int pendingIdleHandlerCount = -1;\n    \/\/ \u4e0b\u4e00\u6b21Poll\u8d85\u65f6\u65f6\u95f4\uff0cnativePollOnce()\u65b9\u6cd5\u7528\u3002\n    int nextPollTimeoutMillis = 0;\n    \/\/ \u5f00\u542f\u5faa\u73af\n    for (;;) {\n        if (nextPollTimeoutMillis != 0) {\n            Binder.flushPendingCommands();\n        }\n\n        \/\/ \u963b\u585e\u65b9\u6cd5\uff0c\u6839\u636enextPollTimeoutMillis\u5224\u65ad\u662f\u5426\u8981\u963b\u585e\u3002\n        \/\/ nextPollTimeoutMillis=-1\uff0c\u4e00\u76f4\u963b\u585e\uff0c\u4e0d\u4f1a\u8d85\u65f6\u3002\n        \/\/ nextPollTimeoutMillis=0\uff0c\u4e0d\u4f1a\u963b\u585e\uff0c\u7acb\u5373\u8fd4\u56de\u3002\n        \/\/ nextPollTimeoutMillis&gt;0\uff0c\u6700\u957f\u963b\u585enextPollTimeoutMillis\u6beb\u79d2\uff0c\u5982\u679c\u671f\u95f4\u6709\u7a0b\u5e8f\u5524\u9192\u4f1a\u7acb\u5373\u8fd4\u56de\u3002\n        nativePollOnce(ptr, nextPollTimeoutMillis);\n\n        synchronized (this) {\n            \/\/ \u5c1d\u8bd5\u68c0\u7d22\u4e0b\u4e00\u6761\u6d88\u606f\uff0c\u5982\u679c\u53d1\u73b0\u5219\u8fd4\u56de\u3002\n            final long now = SystemClock.uptimeMillis(); \/\/ \u5f53\u524d\u65f6\u523b\n            Message prevMsg = null; \/\/ \u4e0a\u4e00\u4e2a\u6d88\u606f\n            Message msg = mMessages; \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3aHead\u3002\n            if (msg != null &amp;&amp; msg.target == null) {\n                \/\/ \u961f\u9996\u662f\u540c\u6b65\u5c4f\u969c\u6d88\u606f\uff0c\u88ab\u5c4f\u969c\u963b\u6321\u3002\u5728\u961f\u5217\u4e2d\u67e5\u627e\u4e0b\u4e00\u4e2a\u5f02\u6b65Message\u3002\n                \/\/ \u8bf4\u660e\uff1a\u540c\u6b65\u5c4f\u969c\u53ea\u5141\u8bb8\u5f02\u6b65\u6d88\u606f\u901a\u8fc7\uff0c\u6240\u4ee5\u5f97\u627e\u5230\u4e0b\u4e00\u4e2a\u5f02\u6b65Message\u3002\n\n                \/\/ \u4f7f\u7528do-while\u5148\u83b7\u53d6\u5230\u4e0b\u4e00\u4e2a\u6570\u636e\uff0c\u7136\u540e\u518d\u5224\u65ad\uff0c\u56e0\u4e3a\u5f53\u524d\u6d88\u606f\u4e3a\u540c\u6b65\u5c4f\u969c\u6d88\u606f\u3002\n                do {\n                    prevMsg = msg; \/\/ \u524d\u4e00\u4e2a\u4e3a\u5f53\u524d\n                    msg = msg.next; \/\/ \u5f53\u524d\u7684\u4e3a\u4e0b\u4e00\u4e2a\uff0c\u4ee5\u4fbf\u5faa\u73af\u3002\n                } while (msg != null &amp;&amp; !msg.isAsynchronous()); \/\/ \u6d88\u606f\u4e0d\u4e3a\u7a7a\uff0c\u5e76\u4e14\u662f\u540c\u6b65\u6d88\u606f\uff0c\u5168\u90e8\u8fc7\u6ee4\u6389\uff08\u56e0\u4e3a\u53ea\u627e\u5f02\u6b65\u6d88\u606f\uff09\u3002\n            }\n\n            if (msg != null) {\n                \/\/ \u6709\u66f4\u591a\u6d88\u606f\uff0c\u5224\u65ad\u662f\u963b\u585e\u8fd8\u662f\u8fd4\u56de\u6d88\u606f\u3002\n                if (now &lt; msg.when) {\n                    \/\/ \u672a\u5230\u8fbe\u6267\u884c\u65f6\u523b\u3002\u8bbe\u7f6e\u4e00\u4e2a\u963b\u585e\u65f6\u95f4\uff0c\u4ee5\u4fbf\u5230\u8fbe\u65f6\u5524\u9192\u3002\n                    nextPollTimeoutMillis = (int) Math.min(msg.when - now, Integer.MAX_VALUE);\n                } else {\n                    \/\/ \u5230\u8fbe\u6267\u884c\u65f6\u523b\uff0c\u79fb\u9664\u6b64\u6d88\u606f\uff0c\u5e76\u8fd4\u56de\u6b64\u6d88\u606f\u3002\n                    mBlocked = false; \/\/ \u4e0d\u963b\u585e\u72b6\u6001\n                    \/\/ \u79fb\u9664\u6b64Message\n                    if (prevMsg != null) {\n                        \/\/ \u8fdb\u5165\u4e86do-while\u5faa\u73af\uff0c\u627e\u5230\u4e86\u4f4d\u7f6e\uff0c\u5c06\u6d88\u606f\u5728\u6b64\u4f4d\u7f6e\u79fb\u9664\u3002\n                        \/\/ \u8fdb\u5165\u4e86do-while\u5faa\u73af\uff0c\u8bf4\u660e\uff1a\u961f\u9996\u662f\u540c\u6b65\u5c4f\u969c\u6d88\u606f\uff0c\u5e76\u4e14\u6b64\u6d88\u606f\u662f\u5f02\u6b65\u6d88\u606f\u3002\n                        prevMsg.next = msg.next; \/\/ \u79fb\u9664\u64cd\u4f5c                        \n                        if (prevMsg.next == null) {\n                            \/\/ \u4e0b\u4e00\u4e2a\u4e3a\u7a7a\uff0c\u8bf4\u660e\u5230\u5c3e\u90e8\u4e86\uff0c\u8bb0\u5f55\u5c3e\u3002\n                            mLast = prevMsg;\n                        }\n                    } else {\n                        \/\/ \u672a\u8fdb\u5165\u4e86do-while\u5faa\u73af\uff0c\u672a\u627e\u5230\u4e86\u4f4d\u7f6e\uff0c\u5c06\u6d88\u606f\u5728\u961f\u9996\u79fb\u9664\u3002\n                        \/\/ \u672a\u8fdb\u5165\u4e86do-while\u5faa\u73af\uff0c\u5e76\u4e14msg\u4e0d\u4e3anull\uff0c\u8bf4\u660e\uff1a\u961f\u9996\u4e0d\u662f\u540c\u6b65\u5c4f\u969c\u6d88\u606f\uff0c\u5e76\u4e14\u6b64\u6d88\u606f\u5c31\u662f\u961f\u9996\u3002\n                        mMessages = msg.next; \/\/ \u79fb\u9664\u64cd\u4f5c\n                        if (msg.next == null) {\n                            \/\/ \u4e0b\u4e00\u4e2a\u4e3a\u7a7a\uff0c\u8bf4\u660e\u5230\u5c3e\u90e8\u4e86\uff0c\u8bb0\u5f55\u5c3e\u3002\n                            mLast = null;\n                        }\n                    }\n                    msg.next = null; \/\/ \u65ad\u5f00\u94fe\u63a5\n                    if (DEBUG) Log.v(TAG, \"Returning message: \" + msg); \/\/ \u6253\u5370\u65e5\u5fd7\uff0c\u63d0\u793a\u6d88\u606f\u8fd4\u56de\u3002\n                    msg.markInUse(); \/\/ \u6807\u8bb0\u6d88\u606f\u5728\u7528\n                    if (msg.isAsynchronous()) {\n                        \/\/ \u662f\u5f02\u6b65\u6d88\u606f\uff0c\u8bb0\u5f55\u5f02\u6b65\u6d88\u606f\u6570\u91cf\u3002\n                        mAsyncMessageCount--;\n                    }\n                    return msg; \/\/ \u8fd4\u56de\u6b64\u6d88\u606f\n                }\n            } else {\n                \/\/ \u65e0\u66f4\u591a\u6d88\u606f\uff0c\u8ba9\u5176\u4e00\u76f4\u963b\u585e\u3002\n                nextPollTimeoutMillis = -1;\n            }\n            \/\/ \u8bf4\u660e\uff1a\u8d70\u5230\u8fd9\uff0c\u8bf4\u660e\u6d88\u606f\u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u8005\u6d88\u606f\u672a\u5230\u8fbe\u6267\u884c\u65f6\u523b\uff0c\u5df2\u7ecf\u8bbe\u7f6e\u4e86\u963b\u585e\u65f6\u95f4nextPollTimeoutMillis\uff0c\u4ee5\u4fbf\u4e0b\u6b21for\u5faa\u73af\u6267\u884c\u3002\n\n            \/\/ \u5904\u7406\u9000\u51fa\n            if (mQuitting) {\n                \/\/ \u6b63\u5728\u9000\u51fa\uff0c\u8fd4\u56denull\uff0c\u4ee5\u7ed3\u675fLooper.loop()\u3002\n                dispose();\n                return null;\n            }            \n            \/\/ \u83b7\u53d6\u7b49\u5f85\u6267\u884c\u7684IdleHandler\u6570\u91cf\uff0c\u9700\u5728\u7b2c\u4e00\u6b21\u5e76\u4e14\u6d88\u606f\u961f\u5217\u7a7a\u95f2\u65f6\u83b7\u53d6\uff0c\u53ea\u83b7\u53d6\u4e00\u6b21\u3002\n            if (pendingIdleHandlerCount &lt; 0\n                    &amp;&amp; (mMessages == null || now &lt; mMessages.when)) {\n                \/\/ \u7b2c\u4e00\u6b21\uff0c\u5e76\u4e14\u6d88\u606f\u961f\u5217\u7a7a\u95f2\uff08\u961f\u5217\u4e3a\u7a7a\u6216\u8005\u5f53\u524d\u65f6\u523b\u672a\u5230\u961f\u9996\u7684\u6267\u884c\u65f6\u523b\uff09\uff0c\u83b7\u53d6IdleHandler\u6570\u91cf\u3002\n                pendingIdleHandlerCount = mIdleHandlers.size();\n            }\n            if (pendingIdleHandlerCount &lt;= 0) {\n                \/\/ \u6ca1\u6709IdleHandler\u8981\u5904\u7406\uff0c\u5219\u8fdb\u5165\u4e0b\u4e00\u6b21for\u5faa\u73af\uff0c\u4ee5\u4fbf\u6267\u884c\u8bbe\u7f6e\u597d\u7684nextPollTimeoutMillis\u3002\n                mBlocked = true; \/\/ \u8bbe\u7f6e\u4e3a\u963b\u585e\u72b6\u6001\uff0c\u539f\u56e0\u770b\u4e0a\u9762\u8bf4\u660e\u3002\n                continue;\n            }\n            \/\/ \u8bf4\u660e\uff1a\u8d70\u5230\u8fd9\uff0c\u8bf4\u660e\u6d88\u606f\u961f\u5217\u7a7a\u95f2\uff0c\u5e76\u4e14\u6709IdleHandler\u8981\u5904\u7406\u3002\u4ee5\u4e0b\u4ee3\u7801\u5168\u90e8\u4e3a\u5904\u7406IdleHandler\u3002\n\n            \/\/ \u521b\u5efamPendingIdleHandlers\u6570\u7ec4\uff0c\u6700\u5c11\u4e3a4\u4e2a\u3002\n            if (mPendingIdleHandlers == null) {\n                mPendingIdleHandlers = new IdleHandler[Math.max(pendingIdleHandlerCount, 4)];\n            }\n            \/\/ \u5c06mIdleHandlers\u4e2d\u6240\u6709IdleHandler\uff0c\u590d\u5236\u5230mPendingIdleHandlers\u4e2d\uff0c\u4ee5\u4fbf\u6267\u884c\u3002\n            \/\/ \u8bf4\u660e\uff1a\u5982\u679cmIdleHandlers\u6570\u91cf\u6bd4mPendingIdleHandlers\u6570\u7ec4\u957f\u5ea6\u5927\uff0c\u5219\u4f1a\u8fdb\u884c\u6269\u5bb9\u3002\n            mPendingIdleHandlers = mIdleHandlers.toArray(mPendingIdleHandlers);\n        }\n\n        \/\/ \u8fd0\u884cIdleHandler\uff0c\u6211\u4eec\u53ea\u5728\u6b64next\u65b9\u6cd5\uff0c\u7b2c\u4e00\u6b21\u8fed\u4ee3\u65f6\u5230\u8fbe\u8fd9\u4e2a\u4ee3\u7801\u5757\u3002\n        for (int i = 0; i &lt; pendingIdleHandlerCount; i++) {\n            final IdleHandler idler = mPendingIdleHandlers[i]; \/\/ \u83b7\u53d6IdleHandler\n            mPendingIdleHandlers[i] = null; \/\/ \u91ca\u653ehandler\u5f15\u7528\n\n            boolean keep = false; \/\/ \u662f\u5426\u4fdd\u6301\u6d3b\u8dc3\n            try {\n                \/\/ \u901a\u77e5\uff0c\u5e76\u63a5\u6536\u5176\u8fd4\u56de\u503c\u3002\n                keep = idler.queueIdle();\n            } catch (Throwable t) {\n                Log.wtf(TAG, \"IdleHandler threw exception\", t);\n            }\n\n            if (!keep) {\n                \/\/ \u4e0d\u4fdd\u6301\u6d3b\u8dc3\uff0c\u5219\u5c06\u5176\u8fdb\u884c\u79fb\u9664\u3002\n                synchronized (this) {\n                    mIdleHandlers.remove(idler); \/\/ \u79fb\u9664\n                }\n            }\n        }\n\n        \/\/ \u5c06IdleHandler\u6570\u91cf\u91cd\u7f6e\u4e3a0\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u4e0d\u4f1a\u518d\u8fd0\u884c\u5b83\u4eec\u4e86\u3002\n        pendingIdleHandlerCount = 0;\n\n        \/\/ \u5728\u8c03\u7528IdleHandler\u65f6\uff0c\u53ef\u80fd\u5df2\u7ecf\u53d1\u9001\u4e86\u65b0\u6d88\u606f\uff0c\u56e0\u6b64\u53ef\u4ee5\u8fd4\u56de\u5e76\u518d\u6b21\u67e5\u627e\u7b49\u5f85\u7684\u6d88\u606f\uff0c\u800c\u4e0d\u5fc5\u7b49\u5f85\u3002\n        nextPollTimeoutMillis = 0;\n    }\n}\n<\/code><\/pre>\n<p><code>next()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u5728<code>MessageQueue<\/code><strong>\u83b7\u53d6\u4e0b\u4e00\u4e2a<\/strong><code>Message<\/code>\uff0c\u5982\u679c\u6b64\u961f\u5217<strong>\u6709<\/strong><code>Message<\/code>\u5e76\u4e14<code>Message<\/code><strong>\u5df2<\/strong>\u5230<strong>\u6267\u884c\u65f6\u523b<\/strong>\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\uff1b\u5982\u679c\u6b64\u961f\u5217<strong>\u4e3a\u7a7a<\/strong>\uff0c\u6216\u8005\u6b64\u961f\u5217<strong>\u6709<\/strong><code>Message<\/code>\u5e76\u4e14<code>Message<\/code><strong>\u672a<\/strong>\u5230<strong>\u6267\u884c\u65f6\u523b<\/strong>\uff0c\u5e76\u4e14\u6ca1\u6709<code>IdleHandler<\/code>\u8981\u6267\u884c\uff0c\u5219\u8fdb\u884c<strong>\u963b\u585e<\/strong>\uff0c\u4ee5\u7b49\u5f85\u65b0\u7684<code>Message<\/code>\u52a0\u5165\uff0c\u6216\u8005\u7b49\u5f85\u6d88\u606f<strong>\u6267\u884c\u65f6\u523b<\/strong>\u5230\u8fbe\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1.  <code>Looper<\/code>\u9000\u51fa\u540e\uff0c<code>next()<\/code>\u65b9\u6cd5\u4f1a\u8fd4\u56de<code>null<\/code>\uff0c\u4ee5\u7ed3\u675f<code>Looper.loop()<\/code>\u3002<br \/>\n  2. \u5982\u679c<strong>\u961f\u9996<\/strong>\u662f<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff0c\u5219\u4f1a<strong>\u8fc7\u6ee4<\/strong>\u6389\u91cc\u9762\u7684<strong>\u540c\u6b65\u6d88\u606f<\/strong>\uff0c<code>next()<\/code>\u65b9\u6cd5\u53ea\u83b7\u53d6<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\u3002<br \/>\n  3. <strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\u6dfb\u52a0\u540e\uff0c\u8bb0\u5f97\u5220\u9664\uff0c\u5426\u5219<strong>\u540c\u6b65\u6d88\u606f<\/strong>\u6c38\u8fdc\u4e0d\u4f1a\u6267\u884c\u3002<br \/>\n  4. <code>MessageQueue<\/code><strong>\u7a7a\u95f2<\/strong>\u72b6\u6001\uff0c\u4e3a\u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u8005<strong>\u5f53\u524d\u65f6\u523b<\/strong>\u672a\u5230<strong>\u961f\u9996<\/strong>\u7684<strong>\u6267\u884c\u65f6\u523b<\/strong>\u3002<br \/>\n  5.  <code>IdleHandler<\/code>\u7684<code>queueIdle()<\/code>\u65b9\u6cd5\uff0c<strong>\u8fd4\u56de\u503c<\/strong>\u4e3a\u662f\u5426\u7ee7\u7eed\u4fdd\u6301<strong>\u6d3b\u8dc3<\/strong>\u72b6\u6001\uff0c<code>true<\/code>\u4e3a\u4fdd\u6301\u6d3b\u8dc3\uff08\u4e0d\u5728<code>mIdleHandlers<\/code>\u4e2d<strong>\u79fb\u9664<\/strong>\uff09\uff0c<code>false<\/code>\u4e3a\u4e0d\u4fdd\u6301\u6d3b\u8dc3\uff08\u5728<code>mIdleHandlers<\/code>\u4e2d<strong>\u79fb\u9664<\/strong>\uff09\uff0c\u5982\u679c\u6ca1\u6709\u79fb\u9664\uff0c\u5219\u4f1a\u5728\u7a7a\u95f2\u65f6\u7ee7\u7eed\u901a\u77e5\u3002<br \/>\n  6. <code>next()<\/code>\u65b9\u6cd5\u5185\u7684<code>for (;;)<\/code>\u4e0d\u662f\u4e3a\u4e86\u4ece\u6b64<code>MessageQueue<\/code>\u4e2d\u904d\u5386\u6d88\u606f\uff0c\u800c\u662f\u4e3a\u4e86\u4ece<strong>\u963b\u585e\u72b6\u6001<\/strong>\u5230<strong>\u8fd4\u56de\u6d88\u606f\u72b6\u6001<\/strong>\u7684<strong>\u5224\u65ad\u8f6c\u6362<\/strong>\u3002<br \/>\n  7. <code>next()<\/code>\u65b9\u6cd5\u53ef\u80fd\u4f1a<strong>\u963b\u585e\u7ebf\u7a0b<\/strong>\uff0c<code>enqueueMessage()<\/code>\u3001<code>quit()<\/code>\u3001<code>removeSyncBarrier()<\/code>\u65b9\u6cd5\u53ef\u80fd\u4f1a<strong>\u5524\u9192\u7ebf\u7a0b<\/strong>\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li>\u83b7\u53d6<code>Message<\/code>\uff0c<code>next()<\/code>\u65b9\u6cd5\u4f1a\u5728<code>MessageQueue<\/code><strong>\u83b7\u53d6\u4e0b\u4e00\u4e2a<\/strong><code>Message<\/code>\uff0c\u5982\u679c\u6b64\u961f\u5217<strong>\u6709<\/strong><code>Message<\/code>\u5e76\u4e14<code>Message<\/code><strong>\u5df2<\/strong>\u5230<strong>\u6267\u884c\u65f6\u523b<\/strong>\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\uff1b\u5982\u679c\u6b64\u961f\u5217<strong>\u4e3a\u7a7a<\/strong>\uff0c\u6216\u8005\u6b64\u961f\u5217<strong>\u6709<\/strong><code>Message<\/code>\u5e76\u4e14<code>Message<\/code><strong>\u672a<\/strong>\u5230<strong>\u6267\u884c\u65f6\u523b<\/strong>\uff0c\u5e76\u4e14\u6ca1\u6709<code>IdleHandler<\/code>\u8981\u6267\u884c\uff0c\u5219\u8fdb\u884c<strong>\u963b\u585e<\/strong>\uff0c\u4ee5\u7b49\u5f85\u65b0\u7684<code>Message<\/code>\u52a0\u5165\uff0c\u6216\u8005\u7b49\u5f85\u6d88\u606f<strong>\u6267\u884c\u65f6\u523b<\/strong>\u5230\u8fbe\u3002<\/li>\n<li>\u5982\u679c<strong>\u961f\u9996<\/strong>\u662f<strong>\u540c\u6b65\u5c4f\u969c\u6d88\u606f<\/strong>\uff0c\u5219\u4f1a<strong>\u8fc7\u6ee4<\/strong>\u6389\u91cc\u9762\u7684<strong>\u540c\u6b65\u6d88\u606f<\/strong>\uff0c<code>next()<\/code>\u65b9\u6cd5\u53ea\u83b7\u53d6<strong>\u5f02\u6b65\u6d88\u606f<\/strong>\u3002<\/li>\n<li><code>IdleHandler<\/code>\u4e3a<code>MessageQueue<\/code><strong>\u7a7a\u95f2<\/strong>\u72b6\u6001\uff08\u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u8005<strong>\u5f53\u524d\u65f6\u523b<\/strong>\u672a\u5230<strong>\u961f\u9996<\/strong>\u7684<strong>\u6267\u884c\u65f6\u523b<\/strong>\uff09\u6267\u884c\uff0c\u5176<code>queueIdle()<\/code>\u65b9\u6cd5\uff0c<strong>\u8fd4\u56de\u503c<\/strong>\u4e3a\u662f\u5426\u7ee7\u7eed\u4fdd\u6301<strong>\u6d3b\u8dc3<\/strong>\u72b6\u6001\uff0c<code>true<\/code>\u4e3a\u4fdd\u6301\u6d3b\u8dc3\uff08\u4e0d\u5728<code>mIdleHandlers<\/code>\u4e2d<strong>\u79fb\u9664<\/strong>\uff09\uff0c<code>false<\/code>\u4e3a\u4e0d\u4fdd\u6301\u6d3b\u8dc3\uff08\u5728<code>mIdleHandlers<\/code>\u4e2d<strong>\u79fb\u9664<\/strong>\uff09\uff0c\u5982\u679c\u6ca1\u6709\u79fb\u9664\uff0c\u5219\u4f1a\u5728\u7a7a\u95f2\u65f6\u7ee7\u7eed\u901a\u77e5\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u79fb\u9664Message<\/h2>\n<h3>\u79fb\u9664Messages<\/h3>\n<h4>removeMessages()<\/h4>\n<pre><code class=\"language-java\">void removeMessages(Handler h, int what, Object object) {\n    if (h == null) {\n        \/\/ Handler\u4e3a\u7a7a\uff0c\u76f4\u63a5\u8fd4\u56de\uff0c\u56e0\u4e3a\u5f97\u9700\u8981Handler\u533a\u5206\u662f\u54ea\u4e2aHandler\u7684\u6d88\u606f\u3002\n        return;\n    }\n\n    \/\/ \u52a0\u5165\u540c\u6b65\u9501\uff0c\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3aHandler\u53ef\u80fd\u4f1a\u5728\u4efb\u610f\u7ebf\u7a0b\u8c03\u7528\u79fb\u9664Message\u3001Callback\u7b49\u65b9\u6cd5\u3002\n    synchronized (this) {\n        \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3aHead\u3002\n        Message p = mMessages;\n\n        \/\/ \u5220\u9664\u524d\u9762\u7b26\u5408\u6761\u4ef6\u7684\u6240\u6709Message\uff08\u5373\u961f\u9996\u662f\u5220\u9664\u76ee\u6807\uff0c\u4ece\u5934\u5f00\u59cb\u5220\u9664\uff0c\u76f4\u5230\u4e0d\u7b26\u5408\u4e3a\u6b62\uff09\u3002\n        while (p != null &amp;&amp; p.target == h &amp;&amp; p.what == what\n               &amp;&amp; (object == null || p.obj == object)) {\n            \/\/ \u5f53\u524d\u6d88\u606f\u4e0d\u4e3a\u7a7a\uff0c\u5e76\u4e14handler\u3001what\u548c\u76ee\u6807\u76f8\u540c\uff0c\u5e76\u4e14\u4e0d\u5339\u914dobject\u6216\u8005\u5339\u914d\u548c\u76ee\u6807\u76f8\u540c\uff0c\u5219\u79fb\u9664\u5f53\u524d\u6d88\u606f\u3002\n            Message n = p.next; \/\/ \u4e0b\u4e2a\u6d88\u606f\n            mMessages = n; \/\/ \u56e0\u4e3a\u8981\u79fb\u9664\u5f53\u524d\u7684\uff0c\u6240\u4ee5Head\u4e3a\u4e0b\u4e00\u4e2a\uff08\u79fb\u9664p\u64cd\u4f5c\uff09\u3002\n            if (p.isAsynchronous()) {\n                \/\/ \u662f\u5f02\u6b65\u6d88\u606f\uff0c\u8bb0\u5f55\u5f02\u6b65\u6d88\u606f\u6570\u91cf\u3002\n                mAsyncMessageCount--;\n            }\n            p.recycleUnchecked(); \/\/ \u5f53\u524d\u7684p\u6d88\u606f\u56de\u6536\n            p = n; \/\/ \u5f53\u524d\u7684p\u4e3a\u4e0b\u4e00\u4e2a\uff0c\u4ee5\u4fbfp\u5faa\u73af\u3002\n        }\n\n        if (p == null) {\n            \/\/ \u5217\u8868\u4e3a\u7a7a\uff08\u672a\u8fdb\u5165\u4e0a\u9762while\uff09\u6216\u8005\u5df2\u7ecf\u79fb\u9664\u4e86\u6240\u6709\u6d88\u606f\uff08\u8fdb\u5165\u4e0a\u9762while\uff09\uff0c\u8bf4\u660e\u5230\u5c3e\u90e8\u4e86\uff0c\u8bb0\u5f55\u5c3e\u3002\n            mLast = mMessages;\n        }\n\n        \/\/ \u5220\u9664\u524d\u9762\u4e4b\u540e\u7b26\u5408\u6761\u4ef6\u7684\u6240\u6709Message\u3002\n        while (p != null) {\n            Message n = p.next; \/\/ \u4e0b\u4e2a\u6d88\u606f\n            if (n != null) { \/\/ \u6709\u4e0b\u4e2a\u6d88\u606f\n                if (n.target == h &amp;&amp; n.what == what\n                    &amp;&amp; (object == null || n.obj == object)) {\n                    \/\/ \u4e0b\u4e2a\u6d88\u606fhandler\u3001what\u548c\u76ee\u6807\u76f8\u540c\uff0c\u5e76\u4e14\u4e0d\u5339\u914dobject\u6216\u8005\u5339\u914d\u548c\u76ee\u6807\u76f8\u540c\uff0c\u5219\u79fb\u9664\u4e0b\u4e2a\u6d88\u606f\u3002\n                    Message nn = n.next; \/\/ \u4e0b\u4e0b\u4e2a\u6d88\u606f\n                    if (n.isAsynchronous()) {\n                        \/\/ \u662f\u5f02\u6b65\u6d88\u606f\uff0c\u8bb0\u5f55\u5f02\u6b65\u6d88\u606f\u6570\u91cf\u3002\n                        mAsyncMessageCount--;\n                    }                    \n                    n.recycleUnchecked(); \/\/ \u4e0b\u4e2a\u6d88\u606f\u56de\u6536\n                    p.next = nn; \/\/ \u4e0b\u4e2a\u6d88\u606f\u4e3a\u4e0b\u4e0b\u4e2a\u6d88\u606f\uff0c\u4e3a\u79fb\u9664\u4e0b\u4e2a\u6d88\u606f\u3002                    \n                    if (p.next == null) {\n                        \/\/ \u4e0b\u4e0b\u4e2a\u6d88\u606f\u4e3a\u7a7a\uff0c\u8bf4\u660e\u5230\u5c3e\u90e8\u4e86\uff0c\u8bb0\u5f55\u5c3e\u3002\n                        mLast = p;\n                    }\n                    continue; \/\/ \u5f53\u524d\u7684\u6d88\u606f\u4f4d\u7f6e\u4e0d\u53d8\uff0c\u4ee5\u4fbf\u518d\u6b21\u8fdb\u884c\u5224\u65ad\u662f\u5426\u4e0b\u4e00\u4e2a\u7b26\u5408\u3002\n                }\n            }\n            p = n; \/\/ \u5f53\u524d\u7684\u4e3a\u4e0b\u4e2a\uff0c\u4ee5\u4fbf\u5faa\u73af\u5bfb\u627e\u5339\u914d\u4e0a\u9762if\u7684\u3002\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>removeMessages(Handler, int, Object)<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5220\u9664<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u6240\u6709<\/strong>\u4e0e\u53c2\u6570<strong>\u76f8\u540c<\/strong><code>Message<\/code>\u7c7b\u578b\uff08<code>Message<\/code>\u7684<code>target<\/code>\u3001<code>what<\/code>\u3001<code>obj<\/code>\u76f8\u540c\uff09\u7684\u6d88\u606f\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u4e00\u4e2a<code>MessageQueue<\/code>\uff0c\u53ef\u80fd\u6709<strong>\u591a\u4e2a<\/strong>\u7b26\u5408\u53c2\u6570\u6761\u4ef6\u7684<code>Message<\/code>\u3001<code>Runnable<\/code>\u3002<br \/>\n  2. \u5b83\u4f1a<strong>\u5148\u5220\u9664\u524d\u9762<\/strong>\u7b26\u5408\u6761\u4ef6\u7684<strong>\u6240\u6709<\/strong><code>Message<\/code>\uff08\u5373<strong>\u961f\u9996<\/strong>\u662f\u5220\u9664\u76ee\u6807\uff0c<strong>\u4ece\u5934\u5f00\u59cb<\/strong>\u5220\u9664\uff0c\u76f4\u5230\u4e0d\u7b26\u5408\u4e3a\u6b62\uff09\uff0c<strong>\u540e\u5220\u9664\u524d\u9762\u5220\u9664\u540e<\/strong>\u7b26\u5408\u6761\u4ef6\u7684<strong>\u6240\u6709<\/strong><code>Message<\/code>\u3002<br \/>\n  3. \u4e3a\u4ec0\u4e48\u8981<strong>\u5148\u5220\u9664\u524d\u9762<\/strong>\u7684\uff0c<strong>\u540e\u5220\u9664\u540e\u9762<\/strong>\u7684\uff0c\u56e0\u4e3a<strong>\u5220\u9664\u524d\u9762<\/strong>\u7684\u8981\u7279\u6b8a\u5904\u7406\uff0c\u7528\u4e8e\u7ef4\u62a4<code>mMessages<\/code>\u5934\uff0c\u6240\u4ee5\u4ee3\u7801\u5c31\u5206\u4e3a\u4e86<strong>\u524d\u540e2\u4e2a<\/strong>\u5220\u9664\u3002<br \/>\n  4. \u53c2\u6570<code>object<\/code>\u4e3a\u7a7a\uff0c\u4e3a\u4e0d\u5339\u914d<code>Message<\/code>\u7684<code>obj<\/code>\uff1b\u53c2\u6570<code>object<\/code>\u4e0d\u4e3a\u7a7a\uff0c\u4e3a\u5339\u914d<code>Message<\/code>\u7684<code>obj<\/code>\uff08\u6b64\u901a\u8fc7<strong>==<\/strong>\u5224\u65ad\uff09\u3002<br \/>\n  5. <code>Handler<\/code>\u7684<code>removeMessages()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002<br \/>\n  6. <code>Handler<\/code>\u79fb\u9664\u6d88\u606f\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976728538972190#heading-29\">Android-Handler\u6e90\u7801\u89e3\u6790-Handler-\u79fb\u9664Messages\u3001Runnable<\/a>\u3002\n<\/p><\/blockquote>\n<h4>removeEqualMessages()<\/h4>\n<pre><code class=\"language-java\">void removeEqualMessages(Handler h, int what, Object object) {\n    if (h == null) {\n        return;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n\n        \/\/ Remove all messages at front.\n        while (p != null &amp;&amp; p.target == h &amp;&amp; p.what == what\n                &amp;&amp; (object == null || object.equals(p.obj))) {\n            Message n = p.next;\n            mMessages = n;\n            if (p.isAsynchronous()) {\n                mAsyncMessageCount--;\n            }\n            p.recycleUnchecked();\n            p = n;\n        }\n\n        if (p == null) {\n            mLast = mMessages;\n        }\n\n        \/\/ Remove all messages after front.\n        while (p != null) {\n            Message n = p.next;\n            if (n != null) {\n                if (n.target == h &amp;&amp; n.what == what\n                        &amp;&amp; (object == null || object.equals(n.obj))) {\n                    Message nn = n.next;\n                    if (n.isAsynchronous()) {\n                        mAsyncMessageCount--;\n                    }\n                    n.recycleUnchecked();\n                    p.next = nn;\n                    if (p.next == null) {\n                        mLast = p;\n                    }\n                    continue;\n                }\n            }\n            p = n;\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>removeEqualMessages(Handler, int, Object)<\/code>\u65b9\u6cd5\uff0c\u903b\u8f91\u540c\u4e0a\u9762<code>removeMessages(Handler, int, Object)<\/code>\u65b9\u6cd5\uff0c\u4e24\u8005\u7684\u533a\u522b\u662f\u5728\u6bd4\u8f83\u53c2\u6570<code>object<\/code>\u65f6\uff0c\u672a\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u540d\u7684\u662f\u901a\u8fc7<strong>==<\/strong>\u6bd4\u8f83\uff08<code>p.obj == object<\/code>\uff09\uff0c\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u540d\u7684\u662f\u901a\u8fc7<strong>equals<\/strong>\u6bd4\u8f83\uff08<code>object.equals(p.obj)<\/code>\uff09\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<\/p>\n<ol>\n<li>\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u548c\u672a\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u7684\u533a\u522b\uff1a\u5728\u6bd4\u8f83\u53c2\u6570<code>object<\/code>\u65f6\uff0c\u672a\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u540d\u7684\u662f\u901a\u8fc7<strong>==<\/strong>\u6bd4\u8f83\uff08\u5982\uff1a<code>p.obj == object<\/code>\uff09\uff0c\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u540d\u7684\u662f\u901a\u8fc7<strong>equals<\/strong>\u6bd4\u8f83\uff08\u5982\uff1a<code>object.equals(p.obj)<\/code>\uff09\u3002\uff08\u6b64\u89c4\u5219\u540e\u9762\u7edf\u4e00\uff09<\/li>\n<\/ol>\n<\/blockquote>\n<h3>\u79fb\u9664Runnable<\/h3>\n<h4>removeMessages<\/h4>\n<pre><code class=\"language-java\">void removeMessages(Handler h, Runnable r, Object object) {\n    if (h == null || r == null) {\n        return;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n\n        \/\/ Remove all messages at front.\n        while (p != null &amp;&amp; p.target == h &amp;&amp; p.callback == r\n                &amp;&amp; (object == null || p.obj == object)) {\n            Message n = p.next;\n            mMessages = n;\n            if (p.isAsynchronous()) {\n                mAsyncMessageCount--;\n            }\n            p.recycleUnchecked();\n            p = n;\n        }\n\n        if (p == null) {\n            mLast = mMessages;\n        }\n\n        \/\/ Remove all messages after front.\n        while (p != null) {\n            Message n = p.next;\n            if (n != null) {\n                if (n.target == h &amp;&amp; n.callback == r\n                        &amp;&amp; (object == null || n.obj == object)) {\n                    Message nn = n.next;\n                    if (n.isAsynchronous()) {\n                        mAsyncMessageCount--;\n                    }\n                    n.recycleUnchecked();\n                    p.next = nn;\n                    if (p.next == null) {\n                        mLast = p;\n                    }\n                    continue;\n                }\n            }\n            p = n;\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>removeMessages(Handler, Runnable, Object)<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5220\u9664<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u6240\u6709<\/strong>\u4e0e\u53c2\u6570<strong>\u76f8\u540c<\/strong><code>Callback<\/code>\u7c7b\u578b\uff08<code>Message<\/code>\u7684<code>target<\/code>\u3001<code>callback<\/code>\u3001<code>obj<\/code>\u76f8\u540c\uff09\u7684\u6d88\u606f\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u5b83\u7684<strong>\u5220\u9664\u8fc7\u7a0b<\/strong>\u548c<code>removeMessages(Handler, int, Object)<\/code>\u65b9\u6cd5<strong>\u76f8\u540c<\/strong>\uff0c<strong>\u53ea\u662f<\/strong>\u628a<strong>\u539f\u6765<\/strong>\u7684<code>Message<\/code>\u7684<code>what<\/code>\u5224\u65ad<strong>\u6539\u4e3a<\/strong>\u4e86<code>Message<\/code>\u7684<code>callback<\/code>\u5224\u65ad\u3002<br \/>\n  2. <code>Handler<\/code>\u7684<code>removeCallbacks()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002\n<\/p><\/blockquote>\n<h4>removeEqualMessages()<\/h4>\n<pre><code class=\"language-java\">void removeEqualMessages(Handler h, Runnable r, Object object) {\n    if (h == null || r == null) {\n        return;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n\n        \/\/ Remove all messages at front.\n        while (p != null &amp;&amp; p.target == h &amp;&amp; p.callback == r\n                &amp;&amp; (object == null || object.equals(p.obj))) {\n            Message n = p.next;\n            mMessages = n;\n            if (p.isAsynchronous()) {\n                mAsyncMessageCount--;\n            }\n            p.recycleUnchecked();\n            p = n;\n        }\n\n        if (p == null) {\n            mLast = mMessages;\n        }\n\n        \/\/ Remove all messages after front.\n        while (p != null) {\n            Message n = p.next;\n            if (n != null) {\n                if (n.target == h &amp;&amp; n.callback == r\n                        &amp;&amp; (object == null || object.equals(n.obj))) {\n                    Message nn = n.next;\n                    if (n.isAsynchronous()) {\n                        mAsyncMessageCount--;\n                    }\n                    n.recycleUnchecked();\n                    p.next = nn;\n                    if (p.next == null) {\n                        mLast = p;\n                    }\n                    continue;\n                }\n            }\n            p = n;\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>removeEqualMessages(Handler, Runnable, Object)<\/code>\u65b9\u6cd5\uff0c\u903b\u8f91\u540c\u4e0a\u9762<code>removeMessages(Handler, Runnable, Object)<\/code>\u65b9\u6cd5\uff0c\u53ea\u4e0d\u8fc7\u6b64\u662f\u901a\u8fc7<strong>equals<\/strong>\u6bd4\u8f83<code>object<\/code>\u53c2\u6570\uff08<code>object.equals(p.obj)<\/code>\uff09\u3002<\/p>\n<h3>\u79fb\u9664Message\u3001Runnable<\/h3>\n<h4>removeCallbacksAndMessages()<\/h4>\n<pre><code class=\"language-java\">void removeCallbacksAndMessages(Handler h, Object object) {\n    if (h == null) {\n        return;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n\n        \/\/ Remove all messages at front.\n        while (p != null &amp;&amp; p.target == h\n               &amp;&amp; (object == null || p.obj == object)) {\n            Message n = p.next;\n            mMessages = n;\n            if (p.isAsynchronous()) {\n                mAsyncMessageCount--;\n            }\n            p.recycleUnchecked();\n            p = n;\n        }\n\n        if (p == null) {\n            mLast = mMessages;\n        }\n\n        \/\/ Remove all messages after front.\n        while (p != null) {\n            Message n = p.next;\n            if (n != null) {\n                if (n.target == h &amp;&amp; (object == null || n.obj == object)) {\n                    Message nn = n.next;\n                    if (n.isAsynchronous()) {\n                        mAsyncMessageCount--;\n                    }\n                    n.recycleUnchecked();\n                    p.next = nn;\n                    if (p.next == null) {\n                        mLast = p;\n                    }\n                    continue;\n                }\n            }\n            p = n;\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>removeCallbacksAndMessages(Handler, Object)<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5220\u9664<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d\u6b64<code>Handler<\/code><strong>\u53d1\u51fa<\/strong>\u7684<strong>\u6240\u6709<\/strong><code>Message<\/code>\u3001<code>Callback<\/code>\uff08<code>Message<\/code>\u7684<code>target<\/code>\u3001<code>obj<\/code>\u76f8\u540c\uff09\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u5b83\u7684<strong>\u5220\u9664\u8fc7\u7a0b<\/strong>\u548c<code>removeMessages(Handler, int, Object)<\/code>\u3001<code>removeMessages(Handler, Runnable, Object)<\/code>\u65b9\u6cd5<strong>\u76f8\u540c<\/strong>\uff0c<strong>\u53ea\u662f<\/strong>\u628a<strong>\u539f\u6765<\/strong>\u7684<code>Message<\/code>\u7684<code>what<\/code>\u5224\u65ad\u6216<code>runnable<\/code>\u5224\u65ad<strong>\u53bb\u6389<\/strong>\u4e86\u3002<br \/>\n  2. <code>Handler<\/code>\u7684<code>removeCallbacksAndMessages()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002<br \/>\n  3. \u53ef\u4ee5\u8c03\u7528<code>handler.removeCallbacksAndMessages(null)<\/code><strong>\u5220\u9664<\/strong>\u6b64<code>Handler<\/code>\u53d1\u51fa\u7684<strong>\u6240\u6709<\/strong><code>Messages<\/code>\u3001<code>Callbacks<\/code>\u3002\n<\/p><\/blockquote>\n<h4>removeCallbacksAndEqualMessages()<\/h4>\n<pre><code class=\"language-java\">void removeCallbacksAndEqualMessages(Handler h, Object object) {\n    if (h == null) {\n        return;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n\n        \/\/ Remove all messages at front.\n        while (p != null &amp;&amp; p.target == h\n                &amp;&amp; (object == null || object.equals(p.obj))) {\n            Message n = p.next;\n            mMessages = n;\n            if (p.isAsynchronous()) {\n                mAsyncMessageCount--;\n            }\n            p.recycleUnchecked();\n            p = n;\n        }\n\n        if (p == null) {\n            mLast = mMessages;\n        }\n\n        \/\/ Remove all messages after front.\n        while (p != null) {\n            Message n = p.next;\n            if (n != null) {\n                if (n.target == h &amp;&amp; (object == null || object.equals(n.obj))) {\n                    Message nn = n.next;\n                    if (n.isAsynchronous()) {\n                        mAsyncMessageCount--;\n                    }\n                    n.recycleUnchecked();\n                    p.next = nn;\n                    if (p.next == null) {\n                        mLast = p;\n                    }\n                    continue;\n                }\n            }\n            p = n;\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>removeCallbacksAndEqualMessages(Handler, Object)<\/code>\u65b9\u6cd5\uff0c\u903b\u8f91\u540c\u4e0a\u9762<code>removeCallbacksAndMessages(Handler, Object)<\/code>\u65b9\u6cd5\uff0c\u53ea\u4e0d\u8fc7\u6b64\u662f\u901a\u8fc7<strong>equals<\/strong>\u6bd4\u8f83<code>object<\/code>\u53c2\u6570\uff08<code>object.equals(p.obj)<\/code>\uff09\u3002<\/p>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li>\u79fb\u9664<code>Message<\/code>\uff0c<code>removeMessages(Handler, int, Object)<\/code>\u3001<code>removeMessages(Handler, Runnable, Object)<\/code>\u3001<code>removeCallbacksAndMessages(Handler, Object)<\/code>\u65b9\u6cd5\u4e3a\u5220\u9664<strong>\u6240\u6709<\/strong>\u7b26\u5408\u6761\u4ef6\u7684<code>Messages<\/code>\u3001<code>Runnable<\/code>\u3002<\/li>\n<li>\u53c2\u6570<code>handler<\/code>\uff0c\u4e3a\u5339\u914d<code>Handler<\/code>\uff0c\u5373\u53ea\u5220\u9664\u6b64<code>handler<\/code>\u53d1\u51fa\u7684<code>Message<\/code>\u3001<code>Runnable<\/code>\uff1b\u53c2\u6570<code>what<\/code>\u3001<code>runnable<\/code>\u4e3a<code>Message<\/code>\u3001<code>Runnable<\/code>\u6807\u8bc6\uff1b\u53c2\u6570<code>object<\/code>\uff0c\u4e3a\u8f85\u52a9\u53c2\u6570\uff0c\u5982\u679c\u4e3a\u7a7a\u5219\u4e3a\u4e0d\u5339\u914d<code>object<\/code>\uff0c\u5982\u679c\u4e0d\u4e3a\u7a7a\u5219\u5339\u914d<code>object<\/code>\u3002<\/li>\n<li>\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u548c\u672a\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u7684\u533a\u522b\uff1a\u5728\u6bd4\u8f83\u53c2\u6570<code>object<\/code>\u65f6\uff0c\u672a\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u540d\u7684\u662f\u901a\u8fc7<strong>==<\/strong>\u6bd4\u8f83\uff08\u5982\uff1a<code>p.obj == object<\/code>\uff09\uff0c\u5e26\u6709<code>Equal<\/code>\u65b9\u6cd5\u540d\u7684\u662f\u901a\u8fc7<strong>equals<\/strong>\u6bd4\u8f83\uff08\u5982\uff1a<code>object.equals(p.obj)<\/code>\uff09\u3002\uff08\u6b64\u89c4\u5219\u7edf\u4e00\uff09<\/li>\n<li><code>Handler<\/code>\u7684<code>removeMessages()<\/code>\u3001<code>removeCallbacks()<\/code>\u3001<code>removeCallbacksAndMessages()<\/code>\u65b9\u6cd5\uff0c\u5c31\u662f\u5206\u522b<strong>\u8c03\u7528<\/strong>\u7684\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u662f\u5426\u6709Message<\/h2>\n<h3>\u662f\u5426\u6709Message<\/h3>\n<h4>hasMessages()<\/h4>\n<pre><code class=\"language-java\">boolean hasMessages(Handler h, int what, Object object) {\n    if (h == null) {\n        \/\/ Handler\u4e3a\u7a7a\uff0c\u76f4\u63a5\u8fd4\u56de\u3002\n        return false;\n    }\n\n    \/\/ \u52a0\u5165\u540c\u6b65\u9501\uff0c\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3aHandler\u53ef\u80fd\u4f1a\u5728\u4efb\u610f\u7ebf\u7a0b\u8c03\u7528\u662f\u5426\u6709Message\u3001Callback\u7b49\u65b9\u6cd5\u3002\n    synchronized (this) {\n        \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3aHead\u3002\n        Message p = mMessages;\n        \/\/ \u904d\u5386\u5224\u65ad\u662f\u5426\u6709\n        while (p != null) {\n            if (p.target == h &amp;&amp; p.what == what &amp;&amp; (object == null || p.obj == object)) {\n                \/\/ \u5f53\u524d\u6d88\u606fhandler\u3001what\u548c\u76ee\u6807\u76f8\u540c\uff0c\u5e76\u4e14\u4e0d\u5339\u914dobject\u6216\u8005\u5339\u914d\u548c\u76ee\u6807\u76f8\u540c\uff0c\u5219\u8fd4\u56detrue\u3002\n                return true;\n            }\n            p = p.next; \/\/ \u5f53\u524d\u7684\u4e3a\u4e0b\u4e00\u4e2a\uff0c\u4ee5\u4fbf\u5faa\u73af\u3002\n        }\n        return false; \/\/ \u6ca1\u627e\u5230\uff0c\u8fd4\u56defalse\u3002\n    }\n}\n<\/code><\/pre>\n<p><code>hasMessages(Handler, int, Object)<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5224\u65ad<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u662f\u5426\u6709<\/strong>\u4e0e\u53c2\u6570<strong>\u76f8\u540c<\/strong><code>Message<\/code>\u7c7b\u578b\uff08<code>Message<\/code>\u7684<code>target<\/code>\u3001<code>what<\/code>\u3001<code>obj<\/code>\u76f8\u540c\uff09\u7684\u6d88\u606f\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u5b83\u4f1a<strong>\u904d\u5386<\/strong><code>MessageQueue<\/code>\u4e2d\u7684<strong>\u6240\u6709<\/strong><code>Message<\/code>\uff0c<strong>\u53ea\u8981\u6709\u4e00\u6761\u7b26\u5408\u6761\u4ef6<\/strong>\uff0c\u5c31\u8fd4\u56de<code>ture<\/code>\uff1b<strong>\u5426\u5219<\/strong>\u8fd4\u56de<code>false<\/code>\u3002<br \/>\n  2. \u53c2\u6570<code>object<\/code>\u4e3a\u7a7a\uff0c\u4e3a\u4e0d\u5339\u914d<code>Message<\/code>\u7684<code>obj<\/code>\uff0c\u5426\u5219\u5339\u914d\u662f\u5426\u548c<code>object<\/code>\u76f8\u540c\u3002<br \/>\n  3. <code>Handler<\/code>\u7684<code>hasMessages()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002<br \/>\n  4. <code>Handler<\/code>\u662f\u5426\u6709\u6d88\u606f\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976728538972190#heading-36\">Android-Handler\u6e90\u7801\u89e3\u6790-Handler-\u662f\u5426\u6709Messages\u3001Runnable<\/a>\u3002\n<\/p><\/blockquote>\n<h4>hasEqualMessages()<\/h4>\n<pre><code class=\"language-java\">boolean hasEqualMessages(Handler h, int what, Object object) {\n    if (h == null) {\n        return false;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n        while (p != null) {\n            if (p.target == h &amp;&amp; p.what == what &amp;&amp; (object == null || object.equals(p.obj))) {\n                return true;\n            }\n            p = p.next;\n        }\n        return false;\n    }\n}\n<\/code><\/pre>\n<p><code>hasEqualMessages(Handler, int, Object)<\/code>\u65b9\u6cd5\uff0c\u903b\u8f91\u540c\u4e0a\u9762<code>hasMessages(Handler, int, Object)<\/code>\u65b9\u6cd5\uff0c\u53ea\u4e0d\u8fc7\u6b64\u662f\u901a\u8fc7<strong>equals<\/strong>\u6bd4\u8f83<code>object<\/code>\u53c2\u6570\uff08<code>object.equals(p.obj)<\/code>\uff09\u3002<\/p>\n<h3>\u662f\u5426\u6709Runnable<\/h3>\n<h4>hasMessages()<\/h4>\n<pre><code class=\"language-java\">@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)\nboolean hasMessages(Handler h, Runnable r, Object object) {\n    if (h == null) {\n        return false;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n        while (p != null) {\n            if (p.target == h &amp;&amp; p.callback == r &amp;&amp; (object == null || p.obj == object)) {\n                return true;\n            }\n            p = p.next;\n        }\n        return false;\n    }\n}\n<\/code><\/pre>\n<p><code>hasMessages(Handler, Runnable, Object)<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5224\u65ad<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u662f\u5426\u6709<\/strong>\u4e0e\u53c2\u6570<strong>\u76f8\u540c<\/strong><code>Callback<\/code>\u7c7b\u578b\uff08<code>Message<\/code>\u7684<code>target<\/code>\u3001<code>callback<\/code>\u3001<code>obj<\/code>\u76f8\u540c\uff09\u7684\u6d88\u606f\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u5b83\u7684<strong>\u5224\u65ad\u8fc7\u7a0b<\/strong>\u548c<code>hasMessages(Handler, int, Object)<\/code>\u65b9\u6cd5<strong>\u76f8\u540c<\/strong>\uff0c<strong>\u53ea\u662f<\/strong>\u628a<strong>\u539f\u6765<\/strong>\u7684<code>Message<\/code>\u7684<code>what<\/code>\u5224\u65ad<strong>\u6539\u4e3a<\/strong>\u4e86<code>Message<\/code>\u7684<code>callback<\/code>\u5224\u65ad\u3002<br \/>\n  2. <code>Handler<\/code>\u7684<code>hasCallbacks()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002\n<\/p><\/blockquote>\n<h3>\u662f\u5426\u6709Messages\u3001Runnable<\/h3>\n<h4>hasMessages()<\/h4>\n<pre><code class=\"language-java\">boolean hasMessages(Handler h) {\n    if (h == null) {\n        return false;\n    }\n\n    synchronized (this) {\n        Message p = mMessages;\n        while (p != null) {\n            if (p.target == h) {\n                return true;\n            }\n            p = p.next;\n        }\n        return false;\n    }\n}\n<\/code><\/pre>\n<p><code>hasMessages(Handler)<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u5224\u65ad<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u662f\u5426\u6709<\/strong>\u6b64<code>Handler<\/code><strong>\u53d1\u51fa<\/strong>\u7684<strong>\u6240\u6709<\/strong><code>Message<\/code>\u3001<code>Callback<\/code>\uff08<code>Message<\/code>\u7684<code>target<\/code>\u76f8\u540c\uff09\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. \u5b83\u7684<strong>\u5224\u65ad\u8fc7\u7a0b<\/strong>\u548c<code>hasMessages(Handler, int, Object)<\/code>\u3001<code>hasMessages(Handler, Runnable, Object)<\/code>\u65b9\u6cd5<strong>\u76f8\u540c<\/strong>\uff0c<strong>\u53ea\u662f<\/strong>\u628a<strong>\u539f\u6765<\/strong>\u7684<code>Message<\/code>\u7684<code>what<\/code>\u3001<code>obj<\/code>\u5224\u65ad\u6216<code>callback<\/code>\u3001<code>obj<\/code>\u5224\u65ad<strong>\u53bb\u6389<\/strong>\u4e86\u3002<br \/>\n  2. <code>Handler<\/code>\u7684<code>hasMessagesOrCallbacks()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002\n<\/p><\/blockquote>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li>\u662f\u5426\u6709<code>Message<\/code>\uff0c<code>hasMessages(Handler, int, Object)<\/code>\u3001<code>hasMessages(Handler, Runnable, Object)<\/code>\u3001<code>hasMessages(Handler)<\/code>\u65b9\u6cd5\u652f\u6301\u5224\u65ad<strong>\u662f\u5426\u6709<\/strong>\u7b26\u5408\u6761\u4ef6\u7684<code>Messages<\/code>\u3001<code>Callbacks<\/code>\u3002<\/li>\n<li><code>Handler<\/code>\u7684<code>hasMessages()<\/code>\u3001<code>hasCallbacks()<\/code>\u3001<code>hasMessagesOrCallbacks()<\/code>\u65b9\u6cd5\uff0c\u5c31\u662f\u5206\u522b<strong>\u8c03\u7528<\/strong>\u7684\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u9000\u51faMessageQueue<\/h2>\n<h3>quit()<\/h3>\n<pre><code class=\"language-java\">void quit(boolean safe) {\n    if (!mQuitAllowed) {\n        \/\/ \u4e0d\u5141\u8bb8\u9000\u51fa\uff08\u53ea\u6709MainLooper\u4e0d\u5141\u8bb8\u9000\u51fa\uff09\uff0c\u518d\u9000\u51fa\uff0c\u629b\u51fa\u5f02\u5e38\uff08\u4e3b\u7ebf\u7a0b\u4e0d\u8fd0\u884c\u9000\u51fa\uff09\u3002\n        throw new IllegalStateException(\"Main thread not allowed to quit.\");\n    }\n\n    \/\/ \u52a0\u5165\u540c\u6b65\u9501\uff0c\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3aLooper\u53ef\u80fd\u4f1a\u5728\u4efb\u610f\u7ebf\u7a0b\u8c03\u7528\u9000\u51fa\u65b9\u6cd5\u3002\n    synchronized (this) {\n        if (mQuitting) {\n            \/\/ \u5df2\u7ecf\u9000\u51fa\u4e2d\uff0c\u518d\u9000\u51fa\uff0c\u4e0d\u64cd\u4f5c\u3002\n            return;\n        }\n        \/\/ \u6807\u8bb0\u9000\u51fa\u4e2d\n        mQuitting = true;\n\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u5b89\u5168\u7684\u9000\u51fa\n        if (safe) {\n            \/\/ \u5b89\u5168\u7684\uff0c\u79fb\u9664\u672a\u6765\uff08\u5f53\u524d\u65f6\u523b\u4ee5\u540e\uff09\u7684\u6240\u6709\u6d88\u606f\u3002\n            removeAllFutureMessagesLocked();\n        } else {\n            \/\/ \u4e0d\u5b89\u5168\u7684\uff0c\u79fb\u9664\u6240\u6709\u6d88\u606f\u3002\n            removeAllMessagesLocked();\n        }\n\n        \/\/ \u5524\u9192\uff0c\u9632\u6b62\u5728\u963b\u585e\u4e2d\u3002\n        nativeWake(mPtr);\n    }\n}\n<\/code><\/pre>\n<p><code>quit()<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u9000\u51fa<\/strong>\u6b64<code>MessageQueue<\/code>\uff0c\u4f1a\u6807\u8bb0<code>mQuitting<\/code>\u4e3a<code>true<\/code>\uff0c\u53c2\u6570<code>safe<\/code>\u4e3a<strong>\u662f\u5426\u5b89\u5168\u9000\u51fa<\/strong>\uff0c<strong>\u5b89\u5168\u9000\u51fa<\/strong>\u4f1a\u8c03\u7528<code>removeAllFutureMessagesLocked()<\/code>\u65b9\u6cd5\uff0c\u79fb\u9664<strong>\u672a\u6765<\/strong>\uff08\u5f53\u524d\u65f6\u523b\u4ee5\u540e\uff09\u7684<strong>\u6240\u6709<\/strong>\u6d88\u606f\u3002<strong>\u4e0d\u5b89\u5168\u9000\u51fa<\/strong>\u4f1a\u8c03\u7528<code>removeAllMessagesLocked()<\/code>\u65b9\u6cd5\uff0c\u79fb\u9664\u6240\u6709\u6d88\u606f\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <strong>\u4e0d\u5141\u8bb8\u9000\u51fa<\/strong>\u7684<code>MessageQueue<\/code>\uff0c<strong>\u9000\u51fa\u540e<\/strong>\u4f1a<strong>\u629b\u51fa\u5f02\u5e38<\/strong>\u3002<br \/>\n  2. <code>Looper<\/code>\u7684<code>quit()<\/code>\u3001<code>quitSafely()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002<br \/>\n  3. <code>Looper<\/code>\u9000\u51fa\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976341056585742#heading-13\">Android-Handler\u6e90\u7801\u89e3\u6790-Looper-\u9000\u51faLooper<\/a>\u3002\n<\/p><\/blockquote>\n<p>\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b\uff0c<strong>\u4e0d\u5b89\u5168\u9000\u51fa<\/strong>\u8c03\u7528\u7684<code>removeAllMessagesLocked()<\/code>\u65b9\u6cd5\u3002<\/p>\n<p><strong>removeAllMessagesLocked()<\/strong><\/p>\n<pre><code class=\"language-java\">private void removeAllMessagesLocked() {\n    \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3aHead\u3002\n    Message p = mMessages;\n    \/\/ \u904d\u5386\u6240\u6709\u6d88\u606f\uff0c\u7136\u540e\u8fdb\u884c\u56de\u6536\u3002\n    while (p != null) {\n        Message n = p.next; \/\/ \u4e0b\u4e2a\u6d88\u606f\n        p.recycleUnchecked(); \/\/ \u56de\u6536\u5f53\u524d\u6d88\u606f\n        p = n; \/\/ \u5f53\u524d\u4e3a\u4e0b\u4e2a\uff0c\u4ee5\u4fbf\u5faa\u73af\u3002\n    }\n    \/\/ \u6e05\u7a7a\u5934\n    mMessages = null;\n    \/\/ \u6e05\u7a7a\u5c3e\n    mLast = null;\n    \/\/ \u6e05\u7a7a\u5f02\u6b65\u6d88\u606f\u6570\u91cf\u3002\n    mAsyncMessageCount = 0;\n}\n<\/code><\/pre>\n<p><code>removeAllMessagesLocked()<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u79fb\u9664<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u6240\u6709\u6d88\u606f<\/strong>\u3002<\/p>\n<p>\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\uff0c<strong>\u5b89\u5168\u9000\u51fa<\/strong>\u8c03\u7528\u7684<code>removeAllFutureMessagesLocked()<\/code>\u65b9\u6cd5\u3002<\/p>\n<p><strong>removeAllFutureMessagesLocked()<\/strong><\/p>\n<pre><code class=\"language-java\">private void removeAllFutureMessagesLocked() {\n    \/\/ \u5f53\u524d\u65f6\u523b\n    final long now = SystemClock.uptimeMillis();\n    Message p = mMessages; \/\/ \u5f53\u524d\u6d88\u606f\uff0c\u9ed8\u8ba4\u4e3aHead\u3002\n    if (p != null) {\n        \/\/ \u961f\u5217\u6709\u6570\u636e\uff0c\u8fdb\u884c\u79fb\u9664\u3002\n        if (p.when&gt; now) {\n            \/\/ \u961f\u9996\u7684\u6267\u884c\u65f6\u523b\u5927\u4e8e\u73b0\u5728\u7684\u65f6\u523b\uff0c\u8bf4\u660e\u4e4b\u540e\u7684\u6d88\u606f\u90fd\u662f\u672a\u6765\uff08\u4ee5\u540e\uff09\u6267\u884c\u7684\uff0c\u6240\u4ee5\u79fb\u9664\u6240\u6709\u6d88\u606f\u3002\n            removeAllMessagesLocked();\n        } else {\n            \/\/ \u975e\u5168\u90e8\u672a\u6765\uff08\u4ee5\u540e\uff09\u6267\u884c\uff0c\u627e\u5230\u4f4d\u7f6e\uff0c\u8fdb\u884c\u79fb\u9664\u4e4b\u540e\u7684\u3002\n            Message n; \/\/ \u4e0b\u4e2a\u6d88\u606f\n            \/\/ \u904d\u5386\uff0c\u627e\u5230\u79fb\u9664\u59cb\u53d1\u4f4d\u7f6e\u3002\n            for (;;) {\n                n = p.next; \/\/ \u4e0b\u4e2a\u6d88\u606f\n                if (n == null) {\n                    \/\/ \u6ca1\u6709\u4e0b\u4e2a\u6d88\u606f\uff0c\u8bf4\u660e\u5230\u961f\u5c3e\u4e86\uff0c\u8fd8\u672a\u8d70\u4e0b\u9762if\u9000\u51fa\uff0c\u8bf4\u660e\u6240\u6709\u6d88\u606f\u90fd\u662f\u4ee5\u524d\u7684\u6d88\u606f\uff0c\u76f4\u63a5\u8fd4\u56de\u3002\n                    return;\n                }\n                if (n.when &gt; now) {\n                    \/\/ \u4e0b\u4e2a\u6d88\u606f\u6267\u884c\u65f6\u523b\u5927\u4e8e\u5f53\u524d\u65f6\u523b\uff0c\u518d\u52a0\u4e0a\u961f\u5217\u91cc\u7684\u65f6\u523b\u662f\u4ece\u5c0f\u5230\u5927\u6709\u5e8f\u7684\uff0c\n                    \/\/ \u5219\u8bf4\u660e\u5f53\u524d\u65f6\u523b\uff0c\u6bd4\u5f53\u524d\u6d88\u606f\u6267\u884c\u65f6\u523b\u5927\uff0c\u6bd4\u4e0b\u4e2a\u6d88\u606f\u6267\u884c\u65f6\u523b\u5c0f\uff0c\u6240\u4ee5\u5373\u627e\u5230\u4f4d\u7f6e\uff0c\u9000\u51fa\u904d\u5386\u3002\n                    break;\n                }\n                p = n; \/\/ \u5f53\u524d\u4e3a\u4e0b\u4e2a\uff0c\u4ee5\u4fbf\u5faa\u73af\u3002\n            }\n            \/\/ \u79fb\u9664\u4e4b\u540e\u7684\n            p.next = null; \/\/ \u65ad\u5f00\u540e\u7eed\u94fe\u63a5\uff0c\u5373\u5df2\u7ecf\u79fb\u9664\u6210\u529f\u3002            \n            \/\/ p\u4e4b\u540e\u7684\u5df2\u7ecf\u79fb\u9664\uff0c\u5219\u8bb0\u5f55p\u4e3a\u5c3e\u3002\n            mLast = p;\n\n            \/\/ \u904d\u5386\u4e4b\u540e\u6240\u6709\u6d88\u606f\uff0c\u7136\u540e\u8fdb\u884c\u56de\u6536\u3002\n            do {\n                p = n;\n                n = p.next;\n                if (p.isAsynchronous()) {\n                    \/\/ \u662f\u5f02\u6b65\u6d88\u606f\uff0c\u8bb0\u5f55\u5f02\u6b65\u6d88\u606f\u6570\u91cf\u3002\n                    mAsyncMessageCount--;\n                }\n\n                p.recycleUnchecked(); \/\/ \u56de\u6536\u6d88\u606f\n            } while (n != null);\n        }\n    }\n}\n<\/code><\/pre>\n<p><code>removeAllFutureMessagesLocked()<\/code>\u65b9\u6cd5\uff0c\u4e3a<strong>\u79fb\u9664<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u672a\u6765<\/strong>\uff08\u5f53\u524d\u65f6\u523b\u4ee5\u540e\uff09\u7684<strong>\u6240\u6709\u6d88\u606f<\/strong>\u3002<\/p>\n<h3>\u5c0f\u7ed3<\/h3>\n<blockquote>\n<ol>\n<li>\u9000\u51fa<code>MessageQueue<\/code>\uff0c<code>quit(false)<\/code>\u4e3a<strong>\u4e0d\u5b89\u5168\u9000\u51fa<\/strong>\u3001<code>quit(true)<\/code>\u4e3a<strong>\u5b89\u5168\u9000\u51fa<\/strong>\u3002<\/li>\n<li><code>looper.quit()<\/code>\uff1a\u4e0d\u5b89\u5168\u9000\u51fa\uff0c\u5b83\u4f1a<strong>\u5220\u9664<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u6240\u6709\u6d88\u606f<\/strong>\u3002\u5728<strong>\u4e0d\u5904\u7406<\/strong>\u6d88\u606f\u961f\u5217\u4e2d\u7684<strong>\u4efb\u4f55\u6d88\u606f<\/strong>\u7684\u60c5\u51b5\u4e0b<strong>\u7ec8\u6b62<\/strong>\uff08\u6b64\u65b9\u6cd5\uff0c<strong>\u53ef\u80fd<\/strong>\u662f<strong>\u4e0d\u5b89\u5168<\/strong>\u7684\uff0c\u56e0\u4e3a\u5728<code>looper<\/code><strong>\u7ec8\u6b62\u4e4b\u524d<\/strong>\u53ef\u80fd<strong>\u65e0\u6cd5\u4f20\u9012<\/strong>\u4e00\u4e9b\u6d88\u606f\uff09\u3002<\/li>\n<li><code>looper.quitSafely()<\/code>\uff1a\u5b89\u5168\u9000\u51fa\uff0c\u5b83\u4f1a<strong>\u5220\u9664<\/strong>\u6b64<code>MessageQueue<\/code>\u4e2d<strong>\u6240\u6709\u672a\u6765\uff08\u5f53\u524d\u65f6\u523b\u4ee5\u540e\uff09\u7684\u6d88\u606f<\/strong>\u3002<strong>\u5904\u7406<\/strong>\u6d88\u606f\u961f\u5217\u4e2d\u7684<strong>\u5df2\u7ecf\u5230\u671f<\/strong>\u7684<strong>\u6240\u6709\u6d88\u606f<\/strong>\uff0c<strong>\u4e0d\u5904\u7406<\/strong>\u6d88\u606f\u961f\u5217\u4e2d\u7684<strong>\u672a\u6765\uff08\u5f53\u524d\u65f6\u523b\u4ee5\u540e\uff09\u5230\u671f<\/strong>\u7684<strong>\u6240\u6709\u6d88\u606f<\/strong>\u7684\u60c5\u51b5\u4e0b<strong>\u7ec8\u6b62<\/strong>\u3002<\/li>\n<\/ol>\n<\/blockquote>\n<h2>\u5176\u5b83<\/h2>\n<h3>isIdle()<\/h3>\n<pre><code class=\"language-java\">public boolean isIdle() {\n    \/\/ \u540c\u6b65\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3a\u53ef\u80fd\u5728\u4efb\u610f\u7ebf\u7a0b\u8c03\u7528\u6b64\u65b9\u6cd5\u3002\n    synchronized (this) {\n        final long now = SystemClock.uptimeMillis(); \/\/ \u5f53\u524d\u65f6\u95f4\n        return mMessages == null || now &lt; mMessages.when; \/\/ \u961f\u5217\u4e3a\u7a7a\uff0c\u6216\u8005\u5f53\u524d\u65f6\u523b\u672a\u5230\u961f\u9996\u7684\u6267\u884c\u65f6\u523b\u3002\n    }\n}\n<\/code><\/pre>\n<p>\u5224\u65ad\u6b64<code>MessageQueue<\/code>\uff0c\u6b64\u65f6\u662f\u5426<strong>\u7a7a\u95f2<\/strong>\u72b6\u6001\u3002<\/p>\n<h3>OnFileDescriptorEventListener<\/h3>\n<p><strong>addOnFileDescriptorEventListener()<\/strong><\/p>\n<pre><code class=\"language-java\">public void addOnFileDescriptorEventListener(@NonNull FileDescriptor fd,\n        @OnFileDescriptorEventListener.Events int events,\n        @NonNull OnFileDescriptorEventListener listener) {\n    if (fd == null) {\n        throw new IllegalArgumentException(\"fd must not be null\");\n    }\n    if (listener == null) {\n        throw new IllegalArgumentException(\"listener must not be null\");\n    }\n\n    synchronized (this) {\n        updateOnFileDescriptorEventListenerLocked(fd, events, listener);\n    }\n}\n<\/code><\/pre>\n<p><code>addOnFileDescriptorEventListener()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u6dfb\u52a0<code>FileDescriptor<\/code>\u76d1\u542c\u5668\uff0c\u4ee5\u4fbf\u5728\u53d1\u751f<code>FileDescriptor<\/code>\u76f8\u5173\u4e8b\u4ef6\u65f6\u63a5\u6536\u901a\u77e5\u3002<\/p>\n<p><strong>removeOnFileDescriptorEventListener()<\/strong><\/p>\n<pre><code class=\"language-java\">public void removeOnFileDescriptorEventListener(@NonNull FileDescriptor fd) {\n    if (fd == null) {\n        throw new IllegalArgumentException(\"fd must not be null\");\n    }\n\n    synchronized (this) {\n        updateOnFileDescriptorEventListenerLocked(fd, 0, null);\n    }\n}\n<\/code><\/pre>\n<p><code>removeOnFileDescriptorEventListener()<\/code>\u65b9\u6cd5\uff0c\u4e3a\u79fb\u9664<code>FileDescriptor<\/code>\u76d1\u542c\u5668\u3002<\/p>\n<p><strong>\u6dfb\u52a0<\/strong>\u548c<strong>\u79fb\u9664<\/strong>\u90fd\u8c03\u7528\u4e86<code>updateOnFileDescriptorEventListenerLocked()<\/code>\u65b9\u6cd5\uff0c\u53ea\u4e0d\u8fc7<strong>\u79fb\u9664<\/strong>\u7684<code>events<\/code>\u4f20\u5165\u7684\u65f6<code>0<\/code>\uff0c\u6211\u4eec\u6765\u770b\u4e0b\u8fd9\u4e2a\u65b9\u6cd5\u3002<\/p>\n<p><strong>updateOnFileDescriptorEventListenerLocked()<\/strong><\/p>\n<pre><code class=\"language-java\">private void updateOnFileDescriptorEventListenerLocked(FileDescriptor fd, int events,\n        OnFileDescriptorEventListener listener) {\n    final int fdNum = fd.getInt$();\n\n    int index = -1;\n    FileDescriptorRecord record = null;\n    if (mFileDescriptorRecords != null) {\n        index = mFileDescriptorRecords.indexOfKey(fdNum);\n        if (index &gt;= 0) {\n            record = mFileDescriptorRecords.valueAt(index);\n            if (record != null &amp;&amp; record.mEvents == events) {\n                return;\n            }\n        }\n    }\n\n    if (events != 0) {\n        \/\/ \u6dfb\u52a0\n        events |= OnFileDescriptorEventListener.EVENT_ERROR;\n        if (record == null) {\n            if (mFileDescriptorRecords == null) {\n                mFileDescriptorRecords = new SparseArray&lt;FileDescriptorRecord&gt;();\n            }\n            record = new FileDescriptorRecord(fd, events, listener);\n            mFileDescriptorRecords.put(fdNum, record);\n        } else {\n            record.mListener = listener;\n            record.mEvents = events;\n            record.mSeq += 1;\n        }\n        nativeSetFileDescriptorEvents(mPtr, fdNum, events);\n    } else if (record != null) {\n        \/\/ \u79fb\u9664\n        record.mEvents = 0;\n        mFileDescriptorRecords.removeAt(index);\n        nativeSetFileDescriptorEvents(mPtr, fdNum, 0);\n    }\n}\n<\/code><\/pre>\n<h3>dump()<\/h3>\n<pre><code class=\"language-java\">void dump(Printer pw, String prefix, Handler h) {\n    synchronized (this) {\n        long now = SystemClock.uptimeMillis();\n        int n = 0;\n        for (Message msg = mMessages; msg != null; msg = msg.next) {\n            if (h == null || h == msg.target) {\n                pw.println(prefix + \"Message \" + n + \": \" + msg.toString(now));\n            }\n            n++;\n        }\n        pw.println(prefix + \"(Total messages: \" + n + \", polling=\" + isPollingLocked()\n                + \", quitting=\" + mQuitting + \")\");\n    }\n}\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u8c03\u8bd5\u76ee\u7684\uff0c\u8f6c\u50a8<code>MessageQueue<\/code>\u7684\u72b6\u6001\uff0c\u6253\u5370\u6b64<code>MessageQueue<\/code>\u5185\u7684\u6b64<code>Handler<\/code>\u7684<strong>\u6240\u6709<\/strong><code>Message<\/code>\u3002<\/p>\n<blockquote><p>\n  \u8bf4\u660e\uff1a<br \/>\n  1. <code>Looper<\/code>\u7684<code>dump()<\/code>\u65b9\u6cd5\uff0c<strong>\u8c03\u7528<\/strong>\u7684\u5c31\u662f<strong>\u6b64\u65b9\u6cd5<\/strong>\u3002<br \/>\n  2. <code>Looper<\/code>\u8f6c\u50a8\u76f8\u5173\u4ecb\u7ecd\uff0c\u8bf7\u770b<a href=\"https:\/\/juejin.cn\/post\/7085976728538972190#heading-45\">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>MessageQueue<\/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-MessageQueue\uff08\u4e09\uff09 \u6e90\u7801\u7248\u672c\uff1a * Handler\uff1aSDK [&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-131","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\/131","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=131"}],"version-history":[{"count":3,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/131\/revisions"}],"predecessor-version":[{"id":222,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/131\/revisions\/222"}],"wp:attachment":[{"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=131"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.devblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}