{"id":415,"date":"2022-11-25T17:24:25","date_gmt":"2022-11-25T09:24:25","guid":{"rendered":"https:\/\/iichen.cn\/?p=415"},"modified":"2022-11-25T17:24:25","modified_gmt":"2022-11-25T09:24:25","slug":"kotlin-%e5%8d%8f%e7%a8%8b%e5%9f%ba%e7%a1%80","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=415","title":{"rendered":"kotlin-\u534f\u7a0b\u57fa\u7840"},"content":{"rendered":"<h5>1. Flow\u66ff\u6362Sequence(SequenceScope\u7c7b\u4e0a\u4f7f\u7528\u4e86RestrictsSuspension\u6ce8\u89e3)<\/h5>\n<h5>2. \u51b7\u6570\u636e\u6d41\uff1aflow \uff08\u6d88\u8d39\u8005\u6d88\u8d39\u65f6\u624d\u4f1a\u751f\u4ea7\u6570\u636e\uff09<\/h5>\n<blockquote><p>\n  \u5b9e\u9645\u662f\u901a\u8fc7SafeFlow\u7c7b\u521b\u5efa\u7684Flow\u5bf9\u8c61\u3002SafeFlow\u7ee7\u627f\u81eaAbstractFlow\u3002\u800cAbstractFlow\u540c\u65f6\u7ee7\u627f\u4e86Flow\u548c            CancellableFlow\u4e24\u4e2a\u63a5\u53e3\u3002\u8fd9\u4e5f\u5c31\u610f\u5473\u7740\u6211\u4eec\u521b\u5efa\u7684\u51b7\u6570\u636e\u6d41Flow\u662f\u53ef\u4ee5\u53d6\u6d88\u7684\u3002<br \/>\n  &#8211;   \u53d6\u6d88\uff1a\u76f4\u63a5\u53d6\u6d88\u5bf9\u5e94\u6240\u5728\u7684\u534f\u7a0b\u5373\u53ef\n<\/p><\/blockquote>\n<ul>\n<li>\u4e3a\u4e86\u4fdd\u8bc1\u4e0a\u4e0b\u6587\u4e00\u81f4\u6027\uff0c\u7981\u6b62withContext\u8fdb\u884c\u7ebf\u7a0b\u8c03\u5ea6\uff0c\u53ef\u4ee5\u4f7f\u7528flowOn<\/p>\n<\/li>\n<li>\n<p>flowOn\uff1a\u53ef\u591a\u6b21\u8c03\u7528\uff0c\u540e\u9762\u7684\u53ea\u5f71\u54cd\u6ca1\u6709\u4e0a\u4e0b\u6587\u7684\uff0c<br \/>\n    \u5982\uff1a{A}.flowOn(Dispatchers.IO).{B}.flowOn(Dispatchers.Main)<br \/>\n    \u7b2c\u4e00\u4e2a\u5f71\u54cd\u7b2c\u4e00\u4e2a\uff0c\u7b2c\u4e8c\u4e2a\u4e0d\u5f71\u54cdA\uff0c\u53ea\u5f71\u54cdB<\/p>\n<\/li>\n<\/ul>\n<h5>3. \u64cd\u4f5c\u7b26<\/h5>\n<ul>\n<li>\u6d41\u7a0b\u64cd\u4f5c\u7b26\uff1a<br \/>\nonStart\uff1a\u5728\u4e0a\u6e38\u6d41\u542f\u52a8\u4e4b\u524d\u88ab\u8c03\u7528\u3002<br \/>\nonEach\uff1a\u5728\u4e0a\u6e38\u6d41\u7684\u6bcf\u4e2a\u503c\u88ab\u4e0b\u6e38\u53d1\u51fa\u4e4b\u524d\u8c03\u7528\u3002<br \/>\nonCompletion\uff1a\u5728\u6d41\u7a0b\u5b8c\u6210\u6216\u53d6\u6d88\u540e\u8c03\u7528\uff0c\u5e76\u5c06\u53d6\u6d88\u5f02\u5e38\u6216\u5931\u8d25\u4f5c\u4e3a\u64cd\u4f5c\u7684\u539f\u56e0\u53c2\u6570\u4f20\u9012\u3002<br \/>\n\u5f02\u5e38\u64cd\u4f5c\u7b26:<br \/>\ncatch: \u53ea\u6355\u83b7\u4e4b\u524d\u7684\uff0c\u540e\u7eed\u7ee7\u7eed\u53d1\u751f\u5f02\u5e38\u4e0d\u4f1a\u6355\u83b7\u3002<\/li>\n<li>\u8f6c\u6362\u64cd\u4f5c\u7b26\uff1a<br \/>\ntransform\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-java line-numbers\">    .transform {\n        emit(it)\n        emit(\"transform $it\")\n    }\n<\/code><\/pre>\n<pre><code>map\/mapNotNull: \u6570\u636e\u8f6c\u6362\n<\/code><\/pre>\n<pre><code class=\"language-java line-numbers\">    .map {\n        it * 5\n    }\n<\/code><\/pre>\n<pre><code>fliter: \u8fc7\u6ee4\n<\/code><\/pre>\n<pre><code class=\"language-java line-numbers\">    .filter {\n        it &lt; 2\n    }\n<\/code><\/pre>\n<pre><code>zip: \u7ec4\u5408\u6d41\n<\/code><\/pre>\n<pre><code class=\"language-java line-numbers\">    flowA.zip(flowB) { valueA,valueB\n        \"$valueA : $valueB\"\n    }\n<\/code><\/pre>\n<p>&#8230;<br \/>\n&#8211; \u9650\u5236\u64cd\u4f5c\u7b26:<br \/>\n    take: \u53d1\u5c04\u6b21\u6570\u5927\u4e8e\u7b49\u4e8ecount\u7684\u503c\u65f6\uff0c\u901a\u8fc7\u629b\u51fa\u5f02\u5e38\u6765\u53d6\u6d88\u6267\u884c<br \/>\n    <code>.take(2) \/\/ \u6b21\u65702\uff0c\u53ea\u53d1\u90012\u6b21<\/code><br \/>\n    takeWhile\uff1a \u7c7b\u4f3cfilter\uff0c\u4f46\u4f1a\u4e2d\u65ad<\/p>\n<pre><code class=\"language-java line-numbers\">    .takeWhile {\n        it  == 1  \/\/ \u4e0d\u662f\u5f53\u524d\u60c5\u51b5 \u76f4\u63a5\u7ec8\u6b62\n    }\n<\/code><\/pre>\n<pre><code>drop: \u4e0etake\u76f8\u53cd\uff0c\u662f\u5148\u4e22\u6389\u4e0d\u5904\u7406\u6307\u5b9a\u6570\u76ee\n`.drop(2) \u4e22\u6389\u524d\u4e24\u6b21\u7684\u6570\u636e\u6d41`\n<\/code><\/pre>\n<p>&#8211; \u80cc\u538b\uff1a<br \/>\n    1. \u4f7f\u7528buffer\u64cd\u4f5c\u7b26\u8fdb\u884c\u4e00\u5b9a\u7684\u7f13\u89e3<br \/>\n    2. \u5176\u4ed6\u5904\u7406<\/p>\n<h5>4. \u70ed\u6570\u636e\u6d41\uff1a\uff08\u6570\u636e\u5728\u6d41\u4e4b\u5916\u751f\u6210\u7136\u540e\u4f20\u9012\u5230\u6d41\uff09<\/h5>\n<ul>\n<li>StateFlow : (\u4e0eLiveData\u7c7b\u4f3c)<br \/>\n<blockquote><p>\n  \u5b83\u7684\u503c\u662f\u552f\u4e00\u7684 <strong>\u5904\u7406\u72b6\u6001<\/strong><br \/>\n  \u5b83\u5141\u8bb8\u88ab\u591a\u4e2a\u89c2\u5bdf\u8005\u5171\u7528 \uff08\u56e0\u6b64\u662f\u5171\u4eab\u7684\u6570\u636e\u6d41\uff09<br \/>\n  \u5b83\u6c38\u8fdc\u53ea\u4f1a\u628a\u6700\u65b0\u7684\u503c\u91cd\u73b0\u7ed9\u8ba2\u9605\u8005\uff0c\u8fd9\u4e0e\u6d3b\u8dc3\u89c2\u5bdf\u8005\u7684\u6570\u91cf\u662f\u65e0\u5173\u7684<\/p>\n<p>  \u5fc5\u987b\u914d\u7f6e\u521d\u59cb\u503c<br \/>\n  value \u7a7a\u5b89\u5168<br \/>\n  <strong>StateFlow \u8ba2\u9605\u8005\u4ec5\u4ec5\u53ea\u53ef\u4ee5\u63a5\u53d7\u6700\u65b0\u7684\u548c\u4e4b\u540e\u7684\u503c<\/strong><br \/>\n  \u9632\u6296<\/p>\n<p>  stateIn \u5c06\u6570\u636e\u6d41\u8f6c\u6362\u4e3a StateFlow\n<\/p><\/blockquote>\n<\/li>\n<li>SharedFlow:<br \/>\n><strong>SharedFlow \u53ef\u4ee5\u4fdd\u7559\u5386\u53f2\u6570\u636e\uff0c\u8ba2\u9605\u8005\u53ef\u4ee5\u83b7\u53d6\u4e4b\u524d\u7684\u5386\u53f2\u6570\u636e<\/strong><br \/>\n>MutableSharedFlow \u6ca1\u6709\u8d77\u59cb\u503c(<strong>\u5904\u7406\u4e8b\u4ef6<\/strong>)<br \/>\n>MutableSharedFlow \u53d1\u5c04\u503c\u9700\u8981\u8c03\u7528 emit()\/tryEmit() \u65b9\u6cd5\uff0c\u6ca1\u6709 setValue() \u65b9\u6cd5<br \/>\n>MutableSharedFlow \u4e0d\u540c\u4e8eMutableStateFlow \u4e0d\u9700\u8981\u4f20\u5165\u9ed8\u8ba4\u503c<\/li>\n<\/ul>\n<h6>4.1 StateFlow\u548cShareFlow\u7684\u4f7f\u7528<\/h6>\n<pre><code>&gt; StateFlow \u4f7f\u7528\u72b6\u6001\u4efb\u7136\u5b58\u5728\u548cLiveData\u76f8\u540c\u7684\u95ee\u9898(\u6a2a\u7ad6\u5c4f\u5207\u6362\u7b49)\n&gt; MutableSharedFlow\u6784\u9020\u51fd\u6570\u5185\u5305\u542b\u4e00\u4e2a replay(\u6574\u5f62)\u53c2\u6570\uff0c\u5176\u5185\u90e8\u4f1a\u901a\u8fc7\u53c2\u6570\u751f\u6210\u4e00\u4e2a\u5bb9\u5668\u8bb0\u5f55\u6700\u65b0\u7684 replay\u4e2a\u6700\u65b0\u7684\u6570\u636e\uff0c\u8ba2\u9605\u8005\u4f1a\u9ed8\u8ba4\u4ece\u5bb9\u5668\u5185\u83b7\u53d6\u3002\u521d\u59cb\u503c0\u5373\u4e0d\u4f1a\u5b58\u5728\u2191\u7684\u95ee\u9898\n<\/code><\/pre>\n<p><strong><center style=\"color:red\">.collect \u5728\u534f\u7a0b\u88ab\u53d6\u6d88\u524d\u4f1a\u4e00\u76f4\u6302\u8d77\uff0c\u8fd9\u6837\u540e\u9762\u7684\u4ee3\u7801\u4fbf\u4e0d\u4f1a\u6267\u884c<\/center><\/strong><\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/p3-juejin.byteimg.com\/tos-cn-i-k3u1fbpfcp\/d90f7dc6ae3f4c3e85eb3e4599e86cb4~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.awebp\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/p3-juejin.byteimg.com\/tos-cn-i-k3u1fbpfcp\/d90f7dc6ae3f4c3e85eb3e4599e86cb4~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.awebp'><img class=\"lazyload lazyload-style-11\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/p3-juejin.byteimg.com\/tos-cn-i-k3u1fbpfcp\/d90f7dc6ae3f4c3e85eb3e4599e86cb4~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.awebp\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/a><\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/p3-juejin.byteimg.com\/tos-cn-i-k3u1fbpfcp\/2f69625600d0416185687dd0319e9009~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.awebp\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/p3-juejin.byteimg.com\/tos-cn-i-k3u1fbpfcp\/2f69625600d0416185687dd0319e9009~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.awebp'><img class=\"lazyload lazyload-style-11\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/p3-juejin.byteimg.com\/tos-cn-i-k3u1fbpfcp\/2f69625600d0416185687dd0319e9009~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.awebp\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/a><\/p>\n<pre><code class=\"language-markdown line-numbers\">CoroutineScope\n    CoroutineName(\u6307\u5b9a\u534f\u7a0b\u540d\u79f0)\n    Job\uff08\u534f\u7a0b\u7684\u751f\u547d\u5468\u671f\uff0c\u7528\u4e8e\u53d6\u6d88\u534f\u7a0b\uff09\n    CoroutineDispatcher\uff0c\u53ef\u4ee5\u6307\u5b9a\u534f\u7a0b\u8fd0\u884c\u7684\u7ebf\u7a0b\n\nsuspend\uff0casync,await\n\nasync\u91cc\u9762\u5982\u679c\u53d1\u751f\u5f02\u5e38\u662f\u4e0d\u4f1a\u76f4\u63a5\u629b\u51fa\u7684\uff0c\u76f4\u5230 await \u5f97\u5230\u8c03\u7528\n\n\u7ed3\u6784\u5316\u5e76\u53d1: B\u5728A\u534f\u7a0b\u5185\u521b\u5efa\uff0c\u5e76\u4e14B\u5728A\u6267\u884c\u5b8c\u4e4b\u524d\u6267\u884c\u7ed3\u675f      \n\nviewModelScope \u6269\u5c55\n\n\u7ba1\u7406\u540c\u65f6\u591a\u4e2a\u534f\u7a0b\uff1a(\u4f1a\u5728\u5185\u90e8\u521b\u5efa\u4e00\u4e2a\u65b0\u7684CoroutineScope\u542f\u52a8\u6267\u884c\u534f\u7a0b\uff0c\u5e76\u8ffd\u8e2a\u76f4\u5230\u5b8c\u6210\u3002)\n        coroutineScope   \u4efb\u610f\u4e00\u4e2a\u534f\u7a0b\u5f02\u5e38\uff0c\u5168\u90e8\u90fd\u4f1a\u505c\u6b62\n        supervisorScope  \u4efb\u610f\u4e00\u4e2a\u534f\u7a0b\u5f02\u5e38\u4e0d\u5f71\u54cd\u5176\u4ed6\u534f\u7a0b\n\nwithContext: \u5207\u6362\u8c03\u5ea6\u5668\n    withContext(Dispatchers.IO) {              \n        \/* perform network IO here *\/  \n    }       \n\nCoroutineName(\"\") \u534f\u7a0b\u547d\u540d\n\nsuspendCancellableCoroutine \u548c suspendCoroutine \u53ef\u4ee5\u5c06\u56de\u8c03\u51fd\u6570\u8f6c\u6362\u4e3a\u534f\u7a0b\n    private suspend fun &lt;T&gt; Call&lt;T&gt;.await(): T {\n        return suspendCoroutine { continuation -&gt;\n            enqueue(object : Callback&lt;T&gt; {\n                override fun onFailure(call: Call&lt;T&gt;, t: Throwable) {\n                    continuation.resumeWithException(t)\n                }\n\n                override fun onResponse(call: Call&lt;T&gt;, response: Response&lt;T&gt;) {\n                    val body = response.body()\n                    if (body != null) continuation.resume(body)\n                    else continuation.resumeWithException(RuntimeException(\"response body is null\"))\n                }\n            })\n        }\n    }\n\nAndroid ktx\u5e93\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1. 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