{"id":42351,"date":"2023-12-11T14:56:18","date_gmt":"2023-12-11T06:56:18","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=42351"},"modified":"2023-12-11T14:56:18","modified_gmt":"2023-12-11T06:56:18","slug":"android-handler%e5%9b%9b%e5%a4%a7%e7%bb%84%e4%bb%b6","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/android-handler%e5%9b%9b%e5%a4%a7%e7%bb%84%e4%bb%b6\/","title":{"rendered":"Android Handler\u56db\u5927\u7ec4\u4ef6?"},"content":{"rendered":"

“`” Message<\/strong><\/p>\n

<pre><code> Message\u662f\u5728\u7ebf\u7a0b\u4e4b\u95f4\u4f20\u9012\u7684\u6d88\u606f\uff0c\u5b83\u53ef\u4ee5\u5728\u5185\u90e8\u643a\u5e26\u5c11\u91cf\u7684\u4fe1\u606f\uff0c\u7528\u4e8e\u5728\u4e0d\u540c\u7ebf\u7a0b\u4e4b\u95f4\u4ea4\u6362\u6570\u636e\u3002 \u4f8b\uff1aMessage\u7684what\u5b57\u6bb5\u3001arg1\u5b57\u6bb5\u3001arg2\u5b57\u6bb5\u6765\u643a\u5e26\u6574\u578b\u6570\u636e\uff0cobj\u5b57\u6bb5\u643a\u5e26\u4e00\u4e2aObject\u5bf9\u8c61\u3002
\n<\/code><\/pre><\/p>\n

<strong>Handler<\/strong><\/p>\n

<pre><code> \u5904\u7406\u8005\uff0c\u5b83\u4e3b\u8981\u7528\u6765\u53d1\u9001\u548c\u5904\u7406\u6d88\u606f\u3002\u53d1\u9001\u6d88\u606f\u4e00\u822c\u662f\u4f7f\u7528Handler\u7684sendMessage()\u65b9\u6cd5\uff0c\u6d88\u606f\u7ecf\u8fc7\u5904\u7406\u540e\uff0c\u6700\u7ec8\u4f20\u9012\u5230Handler\u7684handlerMessage()\u65b9\u6cd5\u4e2d\u3002
\n<\/code><\/pre><\/p>\n

<strong>MessageQueue<\/strong><\/p>\n

<pre><code> \u6d88\u606f\u961f\u5217\uff0c\u5b83\u4e3b\u8981\u7528\u6765\u5b58\u653e\u6240\u6709\u901a\u8fc7Handler\u53d1\u9001\u7684\u6d88\u606f\uff0c\u8fd9\u90e8\u5206\u6d88\u606f\u4f1a\u4e00\u76f4\u5b58\u5728\u4e8e\u6d88\u606f\u961f\u5217\u4e2d\uff0c\u7b49\u5f85\u88ab\u5904\u7406\u3002\u6ce8\u610f\uff1a\u6bcf\u4e2a\u7ebf\u7a0b\u4e2d\u53ea\u4f1a\u6709\u4e00\u4e2aMessageQueue\u5bf9\u8c61\u3002
\n<\/code><\/pre><\/p>\n

<strong>Looper<\/strong><\/p>\n

<pre><code> \u662f\u6bcf\u4e2a\u7ebf\u7a0b\u4e2dMessageQueue\u7684\u7ba1\u5bb6\uff0c\u8c03\u7528Looper\u7684loop()\u65b9\u6cd5\u540e\uff0c\u5c31\u4f1a\u8fdb\u5165\u5230\u4e00\u4e2a\u65e0\u9650\u5faa\u73af\u5f53\u4e2d\uff0c\u6bcf\u5f53\u53d1\u73b0MessageQueue\u4e2d\u5b58\u5728\u4e00\u6761\u6d88\u606f\uff0c\u5c31\u4f1a\u5c06\u5176\u53d6\u51fa\u4f20\u9012\u5230Handler\u7684handleMessage()\u65b9\u6cd5\u5f53\u4e2d\u3002
\n<\/code><\/pre><\/p>\n

\u6ce8\u610f\uff1a\u6bcf\u4e2a\u7ebf\u7a0b\u4e2d\u53ea\u4f1a\u6709\u4e00\u4e2aLooper\u5bf9\u8c61\u3002<\/p>\n

\u5f02\u6b65\u6d88\u606f\u5904\u7406\u6d41\u7a0b\uff1a<\/p>\n

<ol start="""">
\n<li>\u5728\u4e3b\u7ebf\u7a0b\u5f53\u4e2d\u521b\u5efa\u4e00\u4e2aHandler\u5bf9\u8c61\uff1b<\/li>
\n<li>\u91cd\u5199handleMessage()\u65b9\u6cd5\uff1b<\/li>
\n<li>\u5f53\u5b50\u7ebf\u7a0b\u9700\u8981\u8fdb\u884cUI\u64cd\u4f5c\u65f6\uff0c\u521b\u5efa\u4e00\u4e2aMessage\u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7Handler\u5c06\u6d88\u606f\u53d1\u9001\u51fa\u53bb\uff1b<\/li>
\n<li>\u6d88\u606f\u6dfb\u52a0\u5230MessageQueue\u7684\u961f\u5217\u4e2d\u7b49\u5f85\u88ab\u5904\u7406\uff1b<\/li>
\n<li>Looper\u5728MessageQueue\u4e2d\u53d6\u51fa\u5f85\u5904\u7406\u6d88\u606f\uff0c\u53d1\u56deHandler\u7684handleMessage()\u65b9\u6cd5\u4e2d\u3002<\/li>
\n<\/ol><\/p>\n

\u3010\u7531\u4e8eHandler\u662f\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u521b\u5efa\u7684\uff0c\u56e0\u6b64\u6211\u4eec\u7684handleMessage()\u65b9\u6cd5\u4e2d\u7684\u4ee3\u7801\u4e5f\u4f1a\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u6267\u884c\uff0c\u907f\u514d\u4e86\u5f02\u5e38\u7684\u4ea7\u751f\u3011<\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” Message <pre><code> Message […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-42351","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42351","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=42351"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42351\/revisions"}],"predecessor-version":[{"id":42352,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42351\/revisions\/42352"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=42351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=42351"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=42351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}