{"id":472,"date":"2025-04-15T15:41:49","date_gmt":"2025-04-15T07:41:49","guid":{"rendered":"https:\/\/trantor.ink\/?p=472"},"modified":"2025-04-15T15:43:07","modified_gmt":"2025-04-15T07:43:07","slug":"%e5%9f%ba%e4%ba%8e-kotlin-%e5%8d%8f%e7%a8%8b%e7%9a%84-livedata-%e6%9b%bf%e4%bb%a3%e6%96%b9%e6%a1%88%ef%bc%8c%e7%89%b9%e6%80%a7%e8%af%a6%e8%a7%a3%e5%8f%8a%e5%af%b9%e6%af%94","status":"publish","type":"post","link":"https:\/\/trantor.ink\/?p=472","title":{"rendered":"\u57fa\u4e8e Kotlin \u534f\u7a0b\u7684 LiveData \u66ff\u4ee3\u65b9\u6848\uff0c\u7279\u6027\u8be6\u89e3\u53ca\u5bf9\u6bd4"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/trantor.ink\/?p=472\/#%E2%9C%85_%E7%9B%AE%E5%89%8D%E5%9F%BA%E4%BA%8E_Kotlin_%E5%8D%8F%E7%A8%8B%E7%9A%84_LiveData_%E6%9B%BF%E4%BB%A3%E6%96%B9%E6%A1%88\" >\u2705 \u76ee\u524d\u57fa\u4e8e Kotlin \u534f\u7a0b\u7684 LiveData \u66ff\u4ee3\u65b9\u6848<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/trantor.ink\/?p=472\/#%F0%9F%94%8D_%E8%AF%A6%E7%BB%86%E5%AF%B9%E6%AF%94\" >\ud83d\udd0d \u8be6\u7ec6\u5bf9\u6bd4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/trantor.ink\/?p=472\/#%F0%9F%93%8C_%E6%AF%8F%E4%B8%AA%E6%9B%BF%E4%BB%A3%E6%96%B9%E6%A1%88%E8%AF%A6%E8%A7%A3\" >\ud83d\udccc \u6bcf\u4e2a\u66ff\u4ee3\u65b9\u6848\u8be6\u89e3<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/trantor.ink\/?p=472\/#%E2%9C%85_1_StateFlow_MutableStateFlow\" >\u2705 1.\u00a0StateFlow\u00a0\/\u00a0MutableStateFlow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/trantor.ink\/?p=472\/#%E2%9C%85_2_SharedFlow_MutableSharedFlow\" >\u2705 2.\u00a0SharedFlow\/\u00a0MutableSharedFlow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/trantor.ink\/?p=472\/#%E2%9C%85_3_Channel\" >\u2705 3.\u00a0Channel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/trantor.ink\/?p=472\/#%E2%9C%85_4_Flow\" >\u2705 4.\u00a0Flow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/trantor.ink\/?p=472\/#%E2%9C%85_5_LiveData_%E8%BD%AC%E6%8D%A2\" >\u2705 5. LiveData \u8f6c\u6362<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/trantor.ink\/?p=472\/#%F0%9F%93%8C_%E6%9C%80%E4%BD%B3%E6%9B%BF%E4%BB%A3%E6%8E%A8%E8%8D%90%EF%BC%88%E5%88%86%E5%9C%BA%E6%99%AF%EF%BC%89\" >\ud83d\udccc \u6700\u4f73\u66ff\u4ee3\u63a8\u8350\uff08\u5206\u573a\u666f\uff09<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/trantor.ink\/?p=472\/#%E2%9C%85_%E5%B0%8F%E7%BB%93%EF%BC%9ALiveData_%E7%9A%84%E7%8E%B0%E4%BB%A3%E6%9B%BF%E4%BB%A3%E5%85%A8%E6%99%AF%E5%9B%BE\" >\u2705 \u5c0f\u7ed3\uff1aLiveData \u7684\u73b0\u4ee3\u66ff\u4ee3\u5168\u666f\u56fe<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u95ee\u9898\uff01LiveData \u66fe\u662f Android \u67b6\u6784\u4e2d\u72b6\u6001\u4e0e\u4e8b\u4ef6\u7ba1\u7406\u7684\u4e3b\u529b\uff0c\u4f46\u968f\u7740 <strong>Kotlin \u534f\u7a0b\uff08Coroutines\uff09<\/strong> \u7684\u6210\u719f\uff0c\u73b0\u5728\u5df2\u7ecf\u6709\u591a\u4e2a\u66f4\u5f3a\u5927\u3001\u53ef\u7ec4\u5408\u6027\u66f4\u5f3a\u7684\u66ff\u4ee3\u65b9\u6848\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%9C%85_%E7%9B%AE%E5%89%8D%E5%9F%BA%E4%BA%8E_Kotlin_%E5%8D%8F%E7%A8%8B%E7%9A%84_LiveData_%E6%9B%BF%E4%BB%A3%E6%96%B9%E6%A1%88\"><\/span><strong>\u2705 \u76ee\u524d\u57fa\u4e8e Kotlin \u534f\u7a0b\u7684 LiveData \u66ff\u4ee3\u65b9\u6848<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>\u65b9\u6848<\/strong><\/th><th><strong>\u7c7b\u578b<\/strong><\/th><th><strong>\u7528\u9014<\/strong><\/th><th><strong>\u63a8\u8350\u573a\u666f<\/strong><\/th><\/tr><\/thead><tbody><tr><td>StateFlow<\/td><td>\u72b6\u6001\u6d41<\/td><td>\u72b6\u6001\u7ba1\u7406<\/td><td>UI \u72b6\u6001\u3001\u6570\u636e\u5c55\u793a<\/td><\/tr><tr><td>MutableStateFlow<\/td><td>\u53ef\u53d8\u72b6\u6001\u6d41<\/td><td>\u540c\u4e0a<\/td><td>\u5728 ViewModel \u4e2d\u4f7f\u7528<\/td><\/tr><tr><td>SharedFlow<\/td><td>\u4e8b\u4ef6\u6d41<\/td><td>\u4e8b\u4ef6\u53d1\u9001<\/td><td>Toast\u3001\u5bfc\u822a\u7b49\u4e00\u6b21\u6027\u4e8b\u4ef6<\/td><\/tr><tr><td>MutableSharedFlow<\/td><td>\u53ef\u53d8\u4e8b\u4ef6\u6d41<\/td><td>\u540c\u4e0a<\/td><td>\u5728 ViewModel \u4e2d\u4f7f\u7528<\/td><\/tr><tr><td>Channel<\/td><td>\u901a\u9053\uff08\u975e Flow\uff09<\/td><td>\u5355\u6b21\u4e8b\u4ef6<\/td><td>\u7c92\u5ea6\u66f4\u7ec6\u3001\u66f4\u7075\u6d3b\u63a7\u5236\u4e8b\u4ef6<\/td><\/tr><tr><td>Flow<\/td><td>\u51b7\u6d41<\/td><td>\u5f02\u6b65\u6570\u636e\u6d41<\/td><td>\u7f51\u7edc\u8bf7\u6c42\u3001\u6570\u636e\u5e93\u67e5\u8be2\u7b49\u4e00\u6b21\u6027\u4efb\u52a1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%F0%9F%94%8D_%E8%AF%A6%E7%BB%86%E5%AF%B9%E6%AF%94\"><\/span><strong>\ud83d\udd0d \u8be6\u7ec6\u5bf9\u6bd4<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>\u7279\u6027<\/strong><\/th><th><strong>LiveData<\/strong><\/th><th><strong>StateFlow<\/strong><\/th><th><strong>SharedFlow<\/strong><\/th><th><strong>Channel<\/strong><\/th><th><strong>Flow<\/strong><\/th><\/tr><\/thead><tbody><tr><td>\u70ed\/\u51b7\u6d41<\/td><td>\u70ed\u6d41<\/td><td>\u70ed\u6d41<\/td><td>\u70ed\u6d41<\/td><td>\u7c7b\u4f3c\u70ed\u6d41<\/td><td>\u51b7\u6d41<\/td><\/tr><tr><td>\u6301\u6709\u5f53\u524d\u503c<\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u274c<\/td><td>\u274c<\/td><td>\u274c<\/td><\/tr><tr><td>\u53ef\u7ec4\u5408\u64cd\u4f5c\u7b26<\/td><td>\u274c<\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u274c<\/td><td>\u2705<\/td><\/tr><tr><td>\u751f\u547d\u5468\u671f\u611f\u77e5<\/td><td>\u2705<\/td><td>\u274c\uff08\u9700\u624b\u52a8\u5904\u7406\uff09<\/td><td>\u274c<\/td><td>\u274c<\/td><td>\u274c<\/td><\/tr><tr><td>\u521d\u59cb\u503c\u8981\u6c42<\/td><td>\u274c<\/td><td>\u2705\uff08\u5fc5\u987b\uff09<\/td><td>\u274c<\/td><td>\u274c<\/td><td>\u274c<\/td><\/tr><tr><td>\u591a\u6536\u96c6\u652f\u6301<\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u2705\uff08\u9ed8\u8ba4\u4e0d\u4e22\u5931\uff09<\/td><td>\u274c\uff08\u4e00\u5bf9\u4e00\uff09<\/td><td>\u2705<\/td><\/tr><tr><td>\u56de\u653e\u5386\u53f2\u4e8b\u4ef6<\/td><td>\u274c<\/td><td>\u2705\uff08\u4ec5\u6700\u540e\u4e00\u4e2a\uff09<\/td><td>\u2705\uff08\u53ef\u914d\u7f6e\uff09<\/td><td>\u274c<\/td><td>\u274c<\/td><\/tr><tr><td>UI \u72b6\u6001\u9002\u7528<\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u274c<\/td><td>\u274c<\/td><td>\u274c<\/td><\/tr><tr><td>\u4e00\u6b21\u6027\u4e8b\u4ef6\u9002\u7528<\/td><td>\u26a0\ufe0f\uff08\u9700\u5c01\u88c5 Event\uff09<\/td><td>\u274c<\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u274c<\/td><\/tr><tr><td>\u4f7f\u7528\u96be\u5ea6<\/td><td>\u2b50\ufe0f \u7b80\u5355<\/td><td>\u2b50\ufe0f\u2b50\ufe0f<\/td><td>\u2b50\ufe0f\u2b50\ufe0f\u2b50\ufe0f<\/td><td>\u2b50\ufe0f\u2b50\ufe0f\u2b50\ufe0f<\/td><td>\u2b50\ufe0f\u2b50\ufe0f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%F0%9F%93%8C_%E6%AF%8F%E4%B8%AA%E6%9B%BF%E4%BB%A3%E6%96%B9%E6%A1%88%E8%AF%A6%E8%A7%A3\"><\/span><strong>\ud83d\udccc \u6bcf\u4e2a\u66ff\u4ee3\u65b9\u6848\u8be6\u89e3<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%9C%85_1_StateFlow_MutableStateFlow\"><\/span><strong>\u2705 1.\u00a0StateFlow\u00a0\/\u00a0MutableStateFlow<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7528\u9014<\/strong>\uff1a\u6301\u7eed\u6301\u6709 UI \u72b6\u6001\uff08\u5982\u8ba1\u6570\u5668\u3001\u8868\u5355\u8f93\u5165\uff09<\/li>\n\n\n\n<li><strong>\u7279\u6027<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u70ed\u6d41\uff0c\u59cb\u7ec8\u6301\u6709\u6700\u65b0\u503c<\/li>\n\n\n\n<li>\u652f\u6301\u7ec4\u5408\u64cd\u4f5c\uff08map, combine, \u7b49\uff09<\/li>\n\n\n\n<li>\u8ba2\u9605\u65f6\u7acb\u5373\u6536\u5230\u5f53\u524d\u503c<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u793a\u4f8b<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">val state = MutableStateFlow(0)\nval stateFlow: StateFlow&lt;Int> = state<\/pre>\n\n\n\n<p>\ud83d\udc49 \u9002\u5408\u7528\u4e8e ViewModel \u4e2d\u7684<strong>\u72b6\u6001\u6570\u636e<\/strong>\u66ff\u4ee3 LiveData&lt;T&gt;\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%9C%85_2_SharedFlow_MutableSharedFlow\"><\/span><strong>\u2705 2.\u00a0SharedFlow\/\u00a0MutableSharedFlow<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7528\u9014<\/strong>\uff1a\u53d1\u9001\u4e00\u6b21\u6027\u4e8b\u4ef6\uff0c\u5982 Toast\u3001\u5bfc\u822a\u3001\u5f39\u7a97<\/li>\n\n\n\n<li><strong>\u7279\u6027<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u70ed\u6d41\uff0c\u4e0d\u6301\u6709\u503c<\/li>\n\n\n\n<li>\u652f\u6301\u591a\u4e2a\u8ba2\u9605\u8005<\/li>\n\n\n\n<li>\u53ef\u8bbe\u7f6e\u7f13\u51b2\/\u56de\u653e\u6570\u91cf\uff08replay\u3001extraBufferCapacity\uff09<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u793a\u4f8b<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">val event = MutableSharedFlow&lt;String>(replay = 0)\nviewModelScope.launch {\n    event.emit(\"Show Toast\")\n}<\/pre>\n\n\n\n<p>\ud83d\udc49 \u9002\u5408\u7528\u4e8e ViewModel \u4e2d\u7684<strong>\u4e8b\u4ef6\u4f20\u9012<\/strong>\u66ff\u4ee3 LiveData&lt;Event&lt;T&gt;&gt;\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%9C%85_3_Channel\"><\/span><strong>\u2705 3.\u00a0Channel<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7528\u9014<\/strong>\uff1a\u4f4e\u7ea7\u4e8b\u4ef6\u4f20\u9012\u901a\u9053\uff0c\u9002\u5408\u5355\u53d1\u5355\u6536\uff081\u5bf91\uff09<\/li>\n\n\n\n<li><strong>\u7279\u6027<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u57fa\u4e8e\u534f\u7a0b\u7684\u6d88\u606f\u7ba1\u9053<\/li>\n\n\n\n<li>\u4e00\u6b21\u53ea\u80fd\u4e00\u4e2a\u63a5\u6536\u8005<\/li>\n\n\n\n<li>\u652f\u6301\u60ac\u6302\/\u7f13\u51b2\u7b56\u7565<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u793a\u4f8b<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">val channel = Channel&lt;String>()\nchannel.send(\"Message\")\nchannel.receive()<\/pre>\n\n\n\n<p>\ud83d\udc49 \u9002\u5408\u7528\u4e8e\u4efb\u52a1\u8c03\u5ea6\u30011:1 \u4e8b\u4ef6\u6d41\u3001\u4e0d\u9700\u8981\u591a\u4e2a\u63a5\u6536\u8005\u573a\u666f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%9C%85_4_Flow\"><\/span><strong>\u2705 4.\u00a0Flow<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7528\u9014<\/strong>\uff1a\u51b7\u6d41\uff0c\u7528\u4e8e\u5f02\u6b65\u6570\u636e\u52a0\u8f7d<\/li>\n\n\n\n<li><strong>\u7279\u6027<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6bcf\u6b21 collect \u4f1a\u91cd\u65b0\u6267\u884c\u4ee3\u7801\u5757<\/li>\n\n\n\n<li>\u4e0d\u4f1a\u4fdd\u7559\u65e7\u503c<\/li>\n\n\n\n<li>\u7528\u4e8e\u4e00\u6b21\u6027\u4efb\u52a1\u5982\u6570\u636e\u5e93\u67e5\u8be2\u3001\u7f51\u7edc\u8bf7\u6c42<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u793a\u4f8b<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">val result = flow {\n    emit(loadDataFromNetwork())\n}<\/pre>\n\n\n\n<p>\ud83d\udc49 \u662f Retrofit\u3001Room \u7b49\u5e93\u7684\u9996\u9009\uff0c\u9002\u5408\u5904\u7406<strong>\u6570\u636e\u6e90<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%9C%85_5_LiveData_%E8%BD%AC%E6%8D%A2\"><\/span><strong>\u2705 5. LiveData \u8f6c\u6362<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5982\u679c\u4f60\u4ecd\u6709\u90e8\u5206\u4ee3\u7801\u4f9d\u8d56 LiveData\uff0c\u4f60\u53ef\u4ee5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4ece Flow \u8f6c\u6362\u4e3a LiveData\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">val liveData = myFlow.asLiveData()<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4ece LiveData \u8f6c\u6362\u4e3a Flow\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">val flow = myLiveData.asFlow()<\/pre>\n\n\n\n<p>\u4f46\u4e0d\u5efa\u8bae\u65b0\u9879\u76ee\u7ee7\u7eed\u7528 LiveData\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%F0%9F%93%8C_%E6%9C%80%E4%BD%B3%E6%9B%BF%E4%BB%A3%E6%8E%A8%E8%8D%90%EF%BC%88%E5%88%86%E5%9C%BA%E6%99%AF%EF%BC%89\"><\/span><strong>\ud83d\udccc \u6700\u4f73\u66ff\u4ee3\u63a8\u8350\uff08\u5206\u573a\u666f\uff09<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>\u4f7f\u7528\u573a\u666f<\/strong><\/th><th><strong>\u63a8\u8350\u65b9\u6848<\/strong><\/th><\/tr><\/thead><tbody><tr><td>\u6301\u7eed\u72b6\u6001\uff08UI\uff09<\/td><td>StateFlow<\/td><\/tr><tr><td>\u4e00\u6b21\u6027\u4e8b\u4ef6\uff08Toast\/\u5bfc\u822a\uff09<\/td><td>SharedFlow<\/td><\/tr><tr><td>\u5355\u6536\u4e8b\u4ef6\/\u590d\u6742\u7ba1\u63a7<\/td><td>Channel<\/td><\/tr><tr><td>\u5f02\u6b65\u6570\u636e\u6e90\uff08\u7f51\u7edc\/DB\uff09<\/td><td>Flow<\/td><\/tr><tr><td>UI \u72b6\u6001\u548c\u4e8b\u4ef6\u6df7\u5408<\/td><td>StateFlow + SharedFlow \u642d\u914d\u4f7f\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%9C%85_%E5%B0%8F%E7%BB%93%EF%BC%9ALiveData_%E7%9A%84%E7%8E%B0%E4%BB%A3%E6%9B%BF%E4%BB%A3%E5%85%A8%E6%99%AF%E5%9B%BE\"><\/span><strong>\u2705 \u5c0f\u7ed3\uff1aLiveData \u7684\u73b0\u4ee3\u66ff\u4ee3\u5168\u666f\u56fe<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">        +--------------------+\n        |   \u72b6\u6001 -> StateFlow|\n        +--------------------+\n                  \u2193\n        +---------------------+\n        | \u4e00\u6b21\u6027\u4e8b\u4ef6 -> SharedFlow |\n        +---------------------+\n                  \u2193\n        +----------------+\n        |  \u9ad8\u7ea7\u63a7\u5236 -> Channel |\n        +----------------+\n                  \u2193\n        +----------------+\n        | \u6570\u636e\u6d41 -> Flow     |\n        +----------------+<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u95ee\u9898\uff01LiveData \u66fe\u662f Android \u67b6\u6784\u4e2d\u72b6\u6001\u4e0e\u4e8b\u4ef6\u7ba1\u7406\u7684\u4e3b\u529b\uff0c\u4f46\u968f\u7740 Kotlin \u534f\u7a0b\uff08Coroutines\uff09 \u7684\u6210\u719f\uff0c\u73b0\u5728\u5df2\u7ecf\u6709\u591a\u4e2a\u66f4\u5f3a\u5927\u3001\u53ef\u7ec4\u5408\u6027\u66f4\u5f3a\u7684\u66ff\u4ee3\u65b9\u6848\u3002 \u2705 \u76ee\u524d\u57fa\u4e8e Kotlin \u534f\u7a0b\u7684 LiveData \u66ff\u4ee3\u65b9\u6848 \u65b9\u6848 \u7c7b\u578b \u7528\u9014 \u63a8\u8350\u573a\u666f StateFlow \u72b6\u6001\u6d41 \u72b6\u6001\u7ba1\u7406 UI \u72b6\u6001\u3001\u6570\u636e\u5c55\u793a MutableStateFlow \u53ef\u53d8\u72b6\u6001\u6d41 \u540c\u4e0a \u5728 ViewModel \u4e2d\u4f7f\u7528 SharedFlow \u4e8b\u4ef6\u6d41 \u4e8b\u4ef6\u53d1\u9001 Toast\u3001\u5bfc\u822a\u7b49\u4e00\u6b21\u6027\u4e8b\u4ef6 MutableSharedFlow \u53ef\u53d8\u4e8b\u4ef6\u6d41 \u540c\u4e0a \u5728 ViewModel \u4e2d\u4f7f\u7528 Channel \u901a\u9053\uff08\u975e Flow\uff09 \u5355\u6b21\u4e8b\u4ef6 \u7c92\u5ea6\u66f4\u7ec6\u3001\u66f4\u7075\u6d3b\u63a7\u5236\u4e8b\u4ef6 Flow \u51b7\u6d41 \u5f02\u6b65\u6570\u636e\u6d41 \u7f51\u7edc\u8bf7\u6c42\u3001\u6570\u636e\u5e93\u67e5\u8be2\u7b49\u4e00\u6b21\u6027\u4efb\u52a1 \ud83d\udd0d \u8be6\u7ec6\u5bf9\u6bd4 \u7279\u6027 LiveData StateFlow SharedFlow Channel Flow \u70ed\/\u51b7\u6d41 \u70ed\u6d41 \u70ed\u6d41 \u70ed\u6d41 \u7c7b\u4f3c\u70ed\u6d41 \u51b7\u6d41 \u6301\u6709\u5f53\u524d\u503c \u2705 \u2705 \u274c \u274c \u274c \u53ef\u7ec4\u5408\u64cd\u4f5c\u7b26 \u274c \u2705 \u2705 \u274c \u2705 \u751f\u547d\u5468\u671f\u611f\u77e5 \u2705 \u274c\uff08\u9700\u624b\u52a8\u5904\u7406\uff09 \u274c \u274c \u274c \u521d\u59cb\u503c\u8981\u6c42 \u274c \u2705\uff08\u5fc5\u987b\uff09 \u274c \u274c \u274c \u591a\u6536\u96c6\u652f\u6301 \u2705 \u2705 \u2705\uff08\u9ed8\u8ba4\u4e0d\u4e22\u5931\uff09 \u274c\uff08\u4e00\u5bf9\u4e00\uff09 \u2705 \u56de\u653e\u5386\u53f2\u4e8b\u4ef6 \u274c \u2705\uff08\u4ec5\u6700\u540e\u4e00\u4e2a\uff09 \u2705\uff08\u53ef\u914d\u7f6e\uff09 \u274c \u274c UI \u72b6\u6001\u9002\u7528 \u2705 \u2705 \u274c \u274c \u274c \u4e00\u6b21\u6027\u4e8b\u4ef6\u9002\u7528 \u26a0\ufe0f\uff08\u9700\u5c01\u88c5 Event\uff09 \u274c \u2705 \u2705 \u274c \u4f7f\u7528\u96be\u5ea6 \u2b50\ufe0f \u7b80\u5355 \u2b50\ufe0f\u2b50\ufe0f \u2b50\ufe0f\u2b50\ufe0f\u2b50\ufe0f \u2b50\ufe0f\u2b50\ufe0f\u2b50\ufe0f \u2b50\ufe0f\u2b50\ufe0f \ud83d\udccc \u6bcf\u4e2a\u66ff\u4ee3\u65b9\u6848\u8be6\u89e3 \u2705 1.\u00a0StateFlow\u00a0\/\u00a0MutableStateFlow \ud83d\udc49 \u9002\u5408\u7528\u4e8e ViewModel \u4e2d\u7684\u72b6\u6001\u6570\u636e\u66ff\u4ee3 LiveData&lt;T&gt;\u3002 \u2705 2.\u00a0SharedFlow\/\u00a0MutableSharedFlow \ud83d\udc49 \u9002\u5408\u7528\u4e8e ViewModel \u4e2d\u7684\u4e8b\u4ef6\u4f20\u9012\u66ff\u4ee3 LiveData&lt;Event&lt;T&gt;&gt;\u3002 \u2705 3.\u00a0Channel \ud83d\udc49 \u9002\u5408\u7528\u4e8e\u4efb\u52a1\u8c03\u5ea6\u30011:1 \u4e8b\u4ef6\u6d41\u3001\u4e0d\u9700\u8981\u591a\u4e2a\u63a5\u6536\u8005\u573a\u666f\u3002 \u2705 4.\u00a0Flow \ud83d\udc49 \u662f Retrofit\u3001Room \u7b49\u5e93\u7684\u9996\u9009\uff0c\u9002\u5408\u5904\u7406\u6570\u636e\u6e90\u3002 \u2705 5. LiveData \u8f6c\u6362 \u5982\u679c\u4f60\u4ecd\u6709\u90e8\u5206\u4ee3\u7801\u4f9d\u8d56 LiveData\uff0c\u4f60\u53ef\u4ee5\uff1a \u4f46\u4e0d\u5efa\u8bae\u65b0\u9879\u76ee\u7ee7\u7eed\u7528 LiveData\u3002 \ud83d\udccc \u6700\u4f73\u66ff\u4ee3\u63a8\u8350\uff08\u5206\u573a\u666f\uff09 \u4f7f\u7528\u573a\u666f \u63a8\u8350\u65b9\u6848 \u6301\u7eed\u72b6\u6001\uff08UI\uff09 StateFlow \u4e00\u6b21\u6027\u4e8b\u4ef6\uff08Toast\/\u5bfc\u822a\uff09 SharedFlow \u5355\u6536\u4e8b\u4ef6\/\u590d\u6742\u7ba1\u63a7 Channel \u5f02\u6b65\u6570\u636e\u6e90\uff08\u7f51\u7edc\/DB\uff09 Flow UI \u72b6\u6001\u548c\u4e8b\u4ef6\u6df7\u5408 StateFlow + SharedFlow \u642d\u914d\u4f7f\u7528 \u2705 \u5c0f\u7ed3\uff1aLiveData \u7684\u73b0\u4ee3\u66ff\u4ee3\u5168\u666f\u56fe<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-472","post","type-post","status-publish","format-standard","hentry","category-appdev"],"_links":{"self":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/472","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=472"}],"version-history":[{"count":2,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/472\/revisions"}],"predecessor-version":[{"id":474,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/472\/revisions\/474"}],"wp:attachment":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=472"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}