{"id":636,"date":"2025-07-14T01:35:55","date_gmt":"2025-07-14T01:35:55","guid":{"rendered":"https:\/\/boochlin.com\/?p=636"},"modified":"2025-08-24T21:29:07","modified_gmt":"2025-08-24T21:29:07","slug":"%e9%ba%bb%e7%85%a9-viewmodelprovider-factory-%e4%bd%a0%e4%ba%86%ef%bc%8c%e5%9b%a0%e7%82%ba%e7%b3%bb%e7%b5%b1%e4%b8%8d%e8%ae%93%e6%88%91%e7%9b%b4%e6%8e%a5-new-%e4%b8%80%e4%b8%8b","status":"publish","type":"post","link":"https:\/\/boochlin.com\/?p=636","title":{"rendered":"\u9ebb\u7169 ViewModelProvider.Factory\u00a0\u4f60\u4e86\uff0c\u56e0\u70ba\u7cfb\u7d71\u4e0d\u8b93\u6211\u76f4\u63a5 new \u4e00\u500b ViewModel"},"content":{"rendered":"<p>\u9019\u500b\u898f\u7bc4\u662f\u70ba\u4e86\u89e3\u6c7a <strong>Android \u5143\u4ef6\u751f\u547d\u9031\u671f\u4e0d\u4e00\u81f4<\/strong>\u6240\u5e36\u4f86\u7684\u5927\u554f\u984c\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n<h3 class=\"wp-block-heading\">## \u4fdd\u96aa\u7bb1<\/h3>\n<ul>\n<li><strong> \u958b\u767c\u8005<\/strong><\/li>\n<li><strong>Activity\/Fragment (UI \u63a7\u5236\u5668)<\/strong>\uff1a\u662f\u60a8\u7684\u300c\u9322\u5305\u300d\u3002\u60a8\u96a8\u8eab\u5e36\u8457\u5b83\uff0c\u4f46\u5b83\u53ef\u80fd\u96a8\u6642\u6703\u907a\u5931\u3001\u88ab\u5077\u6216\u63db\u65b0\uff08\u4f8b\u5982\u87a2\u5e55\u65cb\u8f49\u6642\uff0c\u820a\u7684 Activity \u6703\u88ab\u92b7\u6bc0\uff0c\u65b0\u7684\u6703\u88ab\u5efa\u7acb\uff09\u3002<\/li>\n<li><strong>ViewModel<\/strong>\uff1a\u662f\u60a8\u7684\u300c\u8b77\u7167\u3001\u623f\u5951\u300d\u7b49<strong>\u91cd\u8981\u8cc7\u7522<\/strong>\u3002\u60a8\u7d55\u5c0d\u4e0d\u6703\u628a\u9019\u4e9b\u6771\u897f\u653e\u5728\u9322\u5305\u88e1\uff0c\u56e0\u70ba\u9322\u5305\u592a\u4e0d\u53ef\u9760\u4e86\u3002<\/li>\n<li><strong>Android \u4f5c\u696d\u7cfb\u7d71<\/strong>\uff1a\u662f\u300c\u653f\u5e9c\u4fdd\u7ba1\u6a5f\u69cb\u300d\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u500b\u8d85\u7d1a\u5b89\u5168\u7684\u4fdd\u7ba1\u7bb1\u670d\u52d9\u3002<\/li>\n<li><strong>ViewModel \u7684\u8cc7\u6599<\/strong>\uff1a\u5c31\u662f\u4fdd\u7ba1\u7bb1\u88e1\u7684\u8b77\u7167\u548c\u623f\u5951\u3002<\/li>\n<\/ul>\n<p>\u73fe\u5728\uff0c\u60a8\u60f3\u628a\u60a8\u7684\u8b77\u7167\u548c\u623f\u5951\uff08ViewModel\uff09\u5b58\u653e\u5230\u653f\u5e9c\u7684\u4fdd\u7ba1\u7bb1\u88e1\u3002\u60a8\u4e0d\u80fd\u76f4\u63a5\u8dd1\u9032\u91d1\u5eab\u3001\u81ea\u5df1\u627e\u500b\u7bb1\u5b50\u628a\u6771\u897f\u4e1f\u9032\u53bb\u3002<\/p>\n<p>\u60a8\u5fc5\u9808\u9075\u5faa\u5b98\u65b9\u7a0b\u5e8f\uff1a<\/p>\n<ol start=\"1\">\n<li><strong>\u586b\u5beb\u7533\u8acb\u8868<\/strong>\uff1a\u60a8\u5fc5\u9808\u586b\u5beb\u4e00\u5f35\u8a73\u7d30\u7684\u7533\u8acb\u8868\uff0c\u544a\u8a34\u653f\u5e9c\u5de5\u4f5c\u4eba\u54e1\uff0c\u7576\u4ed6\u5011\u70ba\u60a8\u958b\u8a2d\u4fdd\u7ba1\u7bb1\u6642\uff0c<strong>\u8981\u653e\u5165\u54ea\u4e9b\u6771\u897f<\/strong>\uff08\u4f8b\u5982\uff0c\u60a8\u7684 Repository \u6216\u5176\u4ed6\u53c3\u6578\uff09\u3002<\/li>\n<li><strong>\u63d0\u4ea4\u7533\u8acb<\/strong>\uff1a\u60a8\u5c07\u7533\u8acb\u8868\u4ea4\u7d66\u5de5\u4f5c\u4eba\u54e1\uff08ViewModelProvider\uff09\u3002<\/li>\n<li><strong>\u7531\u5de5\u4f5c\u4eba\u54e1\u64cd\u4f5c<\/strong>\uff1a\u5de5\u4f5c\u4eba\u54e1\u6839\u64da\u60a8\u7684\u7533\u8acb\u8868\uff0c\u70ba\u60a8\u5efa\u7acb\u4fdd\u7ba1\u7bb1\uff0c\u4e26\u5c07\u60a8\u6307\u5b9a\u7684\u7269\u54c1\uff08\u53c3\u6578\uff09\u653e\u5165\u5176\u4e2d\u3002<\/li>\n<\/ol>\n<p>\u5728\u9019\u500b\u6bd4\u55bb\u4e2d\uff0c\u90a3\u5f35**\u300c\u7533\u8acb\u8868\u300d**\uff0c\u5c31\u662f ViewModelProvider.Factory\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n<h3 class=\"wp-block-heading\">\u70ba\u4f55\u8981\u6709\u9019\u500b\u898f\u7bc4\uff1f\u6838\u5fc3\u539f\u56e0\uff1a\u751f\u547d\u9031\u671f\u4e0d\u540c\u6b65<\/h3>\n<p>Activity\/Fragment \u7684\u751f\u547d\u9031\u671f \u548c ViewModel \u7684\u751f\u547d\u9031\u671f \u662f\u5b8c\u5168\u4e0d\u540c\u7684\u3002<\/p>\n<ol start=\"1\">\n<li>Activity\/Fragment \u7684\u751f\u547d\u9031\u671f\u5f88\u8106\u5f31\uff1a\u7576\u4f7f\u7528\u8005\u65cb\u8f49\u87a2\u5e55\u3001\u7cfb\u7d71\u8a18\u61b6\u9ad4\u4e0d\u8db3\u3001\u6216\u5207\u63db\u6df1\u8272\u6a21\u5f0f\u6642\uff0c\u7576\u524d\u7684 Activity\/Fragment \u4f8b\u9805 (instance) \u6703\u88ab\u92b7\u6bc0 (destroy)\uff0c\u7136\u5f8c\u4e00\u500b\u5168\u65b0\u7684\u4f8b\u9805\u6703\u88ab\u5efa\u7acb\u3002<\/li>\n<li>ViewModel \u7684\u751f\u547d\u9031\u671f\u5f88\u6301\u4e45\uff1aViewModel \u7684\u8a2d\u8a08\u521d\u8877\uff0c\u5c31\u662f\u8981\u6d3b\u5f97\u6bd4 Activity\/Fragment \u66f4\u4e45\u3002\u5b83\u6703\u5728\u9019\u4e9b\u914d\u7f6e\u8b8a\u66f4\u4e2d\u5b58\u6d3b\u4e0b\u4f86\uff0c\u4e26\u88ab\u91cd\u65b0\u5efa\u7acb\u7684 Activity\/Fragment \u7e7c\u7e8c\u4f7f\u7528\uff0c\u5f9e\u800c\u4fdd\u7559 UI \u76f8\u95dc\u7684\u8cc7\u6599\u3002<\/li>\n<\/ol>\n<h4 class=\"wp-block-heading\">\u5982\u679c\u6c92\u6709\u9019\u500b\u898f\u7bc4\uff0c\u6703\u767c\u751f\u4ec0\u9ebc\uff1f<\/h4>\n<p>\u5047\u8a2d Android \u5141\u8a31\u60a8\u5728 Activity \u7684 onCreate \u4e2d\u76f4\u63a5\u5efa\u7acb ViewModel\uff1a<\/p>\n<pre class=\"wp-block-code\"><code>\/\/ \uff01\uff01\uff01\u9019\u662f\u4e00\u500b\u932f\u8aa4\u7684\u5047\u8a2d\u6027\u7a0b\u5f0f\u78bc\uff01\uff01\uff01\nclass MyActivity : AppCompatActivity() {\n    override fun onCreate(savedInstanceState: Bundle?) {\n        super.onCreate(savedInstanceState)\n        val myRepository = UserRepository() \/\/ \u6bcf\u6b21\u90fd\u6703\u5efa\u7acb\u65b0\u7684 Repository\n        \n        \/\/ \u5982\u679c\u53ef\u4ee5\u76f4\u63a5\u9019\u6a23\u505a...\n        val viewModel = MyViewModel(myRepository) \n    }\n}\n<\/code><\/pre>\n<p>\u7576\u87a2\u5e55\u4e00\u65cb\u8f49\uff1a<\/p>\n<ol start=\"1\">\n<li>\u820a\u7684 MyActivity \u88ab\u92b7\u6bc0\uff0c\u60a8\u89aa\u624b\u5efa\u7acb\u7684 viewModel \u7269\u4ef6\u4e5f\u8ddf\u8457<strong>\u88ab\u92b7\u6bc0<\/strong>\u3002<\/li>\n<li>\u65b0\u7684 MyActivity \u88ab\u5efa\u7acb\uff0conCreate \u518d\u6b21\u57f7\u884c\u3002<\/li>\n<li>\u4e00\u500b<strong>\u5168\u65b0\u7684<\/strong> viewModel \u7269\u4ef6\u88ab\u5efa\u7acb\u3002<\/li>\n<\/ol>\n<p><strong>\u7d50\u679c\uff1aViewModel \u88e1\u9762\u4fdd\u5b58\u7684\u6240\u6709\u8cc7\u6599\u5168\u90e8\u907a\u5931\uff01<\/strong> \u9019\u5b8c\u5168\u9055\u80cc\u4e86 ViewModel \u7684\u8a2d\u8a08\u76ee\u7684\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n<h3 class=\"wp-block-heading\">\u7cfb\u7d71\u5982\u4f55\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff1f<\/h3>\n<p>\u70ba\u4e86\u8b93 ViewModel \u80fd\u5920\u5b58\u6d3b\uff0cAndroid \u7cfb\u7d71\u63a1\u53d6\u4e86\u300c\u63a7\u5236\u6b0a\u53cd\u8f49\u300d\u7684\u8a2d\u8a08\u3002<\/p>\n<ol start=\"1\">\n<li><strong>\u63a7\u5236\u6b0a\u4ea4\u7d66\u7cfb\u7d71<\/strong>\uff1aViewModel \u7684\u5efa\u7acb\u548c\u5132\u5b58<strong>\u4e0d\u662f\u7531\u60a8\u76f4\u63a5\u63a7\u5236<\/strong>\uff0c\u800c\u662f\u4ea4\u7531 Android Framework \u7d71\u4e00\u7ba1\u7406\u3002\u7cfb\u7d71\u6703\u5c07 ViewModel \u5b58\u653e\u5728\u4e00\u500b\u7368\u7acb\u65bc Activity\/Fragment \u7684\u5730\u65b9 (ViewModelStore)\u3002<\/li>\n<li><strong>\u958b\u767c\u8005\u63d0\u4f9b\u300c\u8aaa\u660e\u66f8\u300d<\/strong>\uff1a\u7576\u7cfb\u7d71\u9700\u8981\u5efa\u7acb\u4e00\u500b ViewModel \u6642\uff08\u901a\u5e38\u662f\u7b2c\u4e00\u6b21\u8acb\u6c42\u6642\uff09\uff0c\u5b83\u4e0d\u77e5\u9053\u8a72\u5982\u4f55\u8655\u7406\u60a8\u81ea\u8a02\u7684\u5efa\u69cb\u51fd\u5f0f\u53c3\u6578\uff08\u4f8b\u5982 UserRepository\uff09\u3002<\/li>\n<li><strong>Factory \u7684\u89d2\u8272<\/strong>\uff1aViewModelProvider.Factory \u5c31\u662f\u60a8\u63d0\u4f9b\u7d66\u7cfb\u7d71\u7684\u300c\u5efa\u7acb\u8aaa\u660e\u66f8\u300d\u3002\u60a8\u5728 Factory \u7684 create \u65b9\u6cd5\u4e2d\uff0c\u6e05\u695a\u5730\u544a\u8a34\u7cfb\u7d71\uff1a\u300c\u7576\u4f60\u9700\u8981\u5efa\u7acb MyViewModel \u6642\uff0c\u8acb\u9019\u6a23\u505a\uff1aMyViewModel(someRepository)\u300d\u3002<\/li>\n<\/ol>\n<p>&#8212;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9019\u500b\u898f\u7bc4\u662f\u70ba\u4e86\u89e3\u6c7a Android \u5143\u4ef6\u751f\u547d\u9031\u671f\u4e0d\u4e00\u81f4\u6240\u5e36\u4f86\u7684\u5927\u554f\u984c\u3002 ## \u4fdd\u96aa\u7bb1 \u958b\u767c\u8005 Activity\/Fragment (UI \u63a7\u5236\u5668)\uff1a\u662f\u60a8\u7684\u300c\u9322\u5305\u300d\u3002\u60a8\u96a8\u8eab\u5e36\u8457\u5b83\uff0c\u4f46\u5b83\u53ef\u80fd\u96a8\u6642\u6703\u907a\u5931\u3001\u88ab&#8230;<\/p>\n","protected":false},"author":1,"featured_media":838,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"_links":{"self":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/636"}],"collection":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=636"}],"version-history":[{"count":7,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/636\/revisions"}],"predecessor-version":[{"id":839,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/posts\/636\/revisions\/839"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=\/wp\/v2\/media\/838"}],"wp:attachment":[{"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=636"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=636"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boochlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}