{"id":29476,"date":"2023-05-12T11:58:48","date_gmt":"2023-05-12T03:58:48","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=29476"},"modified":"2023-07-30T23:52:55","modified_gmt":"2023-07-30T15:52:55","slug":"handler%e7%9a%84%e9%80%9a%e4%bf%a1%e6%9c%ba%e5%88%b6%e7%9a%84%e8%83%8c%e5%90%8e%e7%9a%84%e5%8e%9f%e7%90%86%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/29476.html","title":{"rendered":"Handler\u7684\u901a\u4fe1\u673a\u5236\u7684\u80cc\u540e\u7684\u539f\u7406\u662f\u4ec0\u4e48"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>Handler\u7684\u901a\u4fe1\u673a\u5236\u7684\u80cc\u540e\u7684\u539f\u7406\u662f\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a Handler \u5b9e\u4f8b\uff0c\u4f46\u662f\u6bcf\u4e2a Handler \u5b9e\u9645\u4e0a\u5f15\u7528\u7684\u662f\u540c\u4e00\u4e2a Looper\u3002\u5f53\u7136\uff0c\u6211\u4eec\u8981\u5728\u521b\u5efa Handler \u4e4b\u524d\u5148\u521b\u5efa Looper\u3002\u800c\u6bcf\u4e2a Looper \u53c8\u53ea\u5bf9\u5e94\u4e00\u4e2a MessageQueue\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-29477\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-50.png?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-50.png?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-50-300x186.png 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u3001Handler\u7684\u901a\u4fe1\u673a\u5236\u7684\u80cc\u540e\u7684\u539f\u7406<\/strong><\/h2>\n<p>Handler\u7684\u901a\u4fe1\u673a\u5236\u7684\u80cc\u540e\u7684\u539f\u7406\u662f\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a Handler \u5b9e\u4f8b\uff0c\u4f46\u662f\u6bcf\u4e2a Handler \u5b9e\u9645\u4e0a\u5f15\u7528\u7684\u662f\u540c\u4e00\u4e2a Looper\u3002\u5f53\u7136\uff0c\u6211\u4eec\u8981\u5728\u521b\u5efa Handler \u4e4b\u524d\u5148\u521b\u5efa Looper\u3002\u800c\u6bcf\u4e2a Looper \u53c8\u53ea\u5bf9\u5e94\u4e00\u4e2a MessageQueue\u3002\u8be5 MessageQueue \u4f1a\u5728\u521b\u5efa Looper \u7684\u65f6\u5019\u88ab\u521b\u5efa\u3002\u5728 MessageQueue \u4e2d\u4f7f\u7528 Message \u5bf9\u8c61\u6765\u62fc\u63a5\u4e00\u4e2a\u5355\u5411\u7684\u94fe\u8868\u7ed3\u6784\uff0c\u4f9d\u6b21\u6765\u6784\u6210\u4e00\u4e2a\u6d88\u606f\u961f\u5217\u3002\u6bcf\u4e2a Message \u662f\u94fe\u8868\u7684\u4e00\u4e2a\u7ed3\u70b9\uff0c\u5c01\u88c5\u4e86\u6211\u4eec\u53d1\u9001\u7684\u4fe1\u606f\u3002<\/p>\n<p>Handler \u53d1\u9001\u6d88\u606f\u7684\u65b9\u6cd5\u5206\u6210 post \u548c send \u4e24\u79cd\u7c7b\u578b\u3002post \u7684\u7528\u6765\u53d1\u9001 Runnable \u7c7b\u578b\u7684\u6570\u636e\uff0csend \u7c7b\u578b\u7684\u7528\u6765\u53d1\u9001 Message \u7c7b\u578b\u7684\u6570\u636e\u3002\u4f46\u4e0d\u8bba\u54ea\u79cd\u7c7b\u578b\u6700\u7ec8\u90fd\u4f1a\u8c03\u7528 Handler \u7684 sendMessageAtTime() \u65b9\u6cd5\u6765\u52a0\u5165\u5230 MessageQueue \u7684\u961f\u5217\u4e2d\u3002\u533a\u522b\u5728\u4e8e\uff0cpost \u7c7b\u578b\u7684\u65b9\u6cd5\u9700\u8981\u7ecf\u8fc7 Handler \u7684 getPostMessage() \u5305\u88c5\u6210 Message \u4e4b\u540e\u518d\u53d1\u9001\u3002<\/p>\n<p>\u5f53\u6d88\u606f\u88ab\u6dfb\u52a0\u5230\u961f\u5217\u4e4b\u540e\u9700\u8981\u6267\u884c\u6d88\u606f\uff0c\u8fd9\u90e8\u5206\u5185\u5bb9\u5728 Looper \u7684\u00a0loop()\u00a0\u65b9\u6cd5\u4e2d\u3002\u5f53\u6211\u4eec\u8c03\u7528 Looper \u7684 loop() \u65b9\u6cd5\u4e4b\u540e\u6574\u4e2a Looper \u5faa\u73af\u5c31\u5f00\u59cb\u4e0d\u65ad\u5730\u5904\u7406\u6d88\u606f\u4e86\u3002\u5f53\u6211\u4eec\u5728\u5faa\u73af\u4e2d\u8c03\u7528 MessageQueue \u7684 next() \u65b9\u6cd5\u6765\u83b7\u53d6\u4e0b\u4e00\u4e2a\u6d88\u606f\u7684\u65f6\u5019\uff0c\u4f1a\u8c03\u7528 nativePollOnce() \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u53ef\u80fd\u4f1a\u9020\u6210\u7ebf\u7a0b\u963b\u585e\u548c\u975e\u963b\u585e\uff0c\u5f53\u7ebf\u7a0b\u4e3a\u975e\u963b\u585e\u7684\u65f6\u5019\u5c31\u4f1a\u4ece Native \u5c42\u56de\u5230 Java \u5c42\uff0c\u4ece MessageQueuue \u4e2d\u53d6\u5f97\u4e00\u4e2a\u6d88\u606f\u4e4b\u540e\u7ed9 Looper \u8fdb\u884c\u5904\u7406\u3002\u5982\u679c\u83b7\u53d6\u7684\u65f6\u5019\u9020\u6210\u7ebf\u7a0b\u963b\u585e\uff0c\u90a3\u4e48\u6709\u4e24\u79cd\u60c5\u51b5\u4f1a\u5524\u9192\u963b\u585e\u7684\u7ebf\u7a0b\uff0c\u4e00\u4e2a\u662f\u5f53\u4e00\u4e2a\u65b0\u7684\u6d88\u606f\u88ab\u52a0\u5165\u5230\u961f\u5217\u4e2d\uff0c\u5e76\u4e14\u5c06\u4f1a\u65e9\u4e8e\u4e4b\u524d\u961f\u5217\u7684\u6240\u6709\u6d88\u606f\u88ab\u89e6\u53d1\uff0c\u90a3\u4e48\u6b64\u65f6\u5c06\u4f1a\u91cd\u65b0\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4\u3002\u5982\u679c\u8fbe\u5230\u4e86\u8d85\u65f6\u65f6\u95f4\u540c\u6837\u53ef\u4ee5\u4ece\u7761\u7720\u72b6\u6001\u4e2d\u8fd4\u56de\uff0c\u4e5f\u5c31\u56de\u5230\u4e86 Java \u5c42\u7ee7\u7eed\u5904\u7406\u3002\u6240\u4ee5\uff0cNative \u5c42\u7684 Looper \u7684\u4f5c\u7528\u5c31\u662f\u901a\u8fc7\u963b\u585e\u6d88\u606f\u961f\u5217\u83b7\u53d6\u6d88\u606f\u7684\u8fc7\u7a0b\u963b\u585e Looper\u3002<\/p>\n<p><strong>\u5ef6\u4f38\u9605\u8bfb\uff1a<br \/><\/strong><\/p>\n<h2 class=\"wp-block-heading\"><strong>\u4e8c\u3001\u6d88\u606f\u673a\u5236\u7684\u6a21\u578b\u6709\u4ec0\u4e48<\/strong><\/h2>\n<p>Message\uff1a\u9700\u8981\u4f20\u9012\u7684\u6d88\u606f\uff0c\u53ef\u4ee5\u4f20\u9012\u6570\u636e\uff1b<\/p>\n<p>MessageQueue\uff1a\u6d88\u606f\u961f\u5217\uff0c\u4f46\u662f\u5b83\u7684\u5185\u90e8\u5b9e\u73b0\u5e76\u4e0d\u662f\u7528\u7684\u961f\u5217\uff0c\u5b9e\u9645\u4e0a\u662f\u901a\u8fc7\u4e00\u4e2a\u5355\u94fe\u8868\u7684\u6570\u636e\u7ed3\u6784\u6765\u7ef4\u62a4\u6d88\u606f\u5217\u8868\uff0c\u56e0\u4e3a\u5355\u94fe\u8868\u5728\u63d2\u5165\u548c\u5220\u9664\u4e0a\u6bd4\u8f83\u6709\u4f18\u52bf\u3002\u4e3b\u8981\u529f\u80fd\u5411\u6d88\u606f\u6c60\u6295\u9012\u6d88\u606f(MessageQueue.enqueueMessage)\u548c\u53d6\u8d70\u6d88\u606f\u6c60\u7684\u6d88\u606f(MessageQueue.next)\uff1b<\/p>\n<p>Handler\uff1a\u6d88\u606f\u8f85\u52a9\u7c7b\uff0c\u4e3b\u8981\u529f\u80fd\u5411\u6d88\u606f\u6c60\u53d1\u9001\u5404\u79cd\u6d88\u606f\u4e8b\u4ef6(Handler.sendMessage)\u548c\u5904\u7406\u76f8\u5e94\u6d88\u606f\u4e8b\u4ef6(Handler.handleMessage)\uff1b<\/p>\n<p>Looper\uff1a\u4e0d\u65ad\u5faa\u73af\u6267\u884c(Looper.loop)\uff0c\u4eceMessageQueue\u4e2d\u8bfb\u53d6\u6d88\u606f\uff0c\u6309\u5206\u53d1\u673a\u5236\u5c06\u6d88\u606f\u5206\u53d1\u7ed9\u76ee\u6807\u5904\u7406\u8005\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Handler\u7684\u901a\u4fe1\u673a\u5236\u7684\u80cc\u540e\u7684\u539f\u7406\u662f\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a Handler \u5b9e\u4f8b\uff0c\u4f46\u662f\u6bcf\u4e2a Handler [&hellip;]","protected":false},"author":1,"featured_media":29477,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/29476"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=29476"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/29476\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/29477"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=29476"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=29476"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=29476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}