{"id":1288,"date":"2026-09-14T14:57:52","date_gmt":"2026-09-14T14:57:52","guid":{"rendered":"https:\/\/boochlin.com\/?p=1288"},"modified":"2026-09-14T15:26:58","modified_gmt":"2026-09-14T15:26:58","slug":"funny-vote-app-%e5%91%8a%e5%88%a5-xml-%e8%bf%8e%e4%be%86-compose%ef%bc%8c%e8%88%87-mvi-%e7%8b%80%e6%85%8b%e6%94%b6%e6%96%82%e9%9b%9c%e8%a8%98%ef%bc%88%e4%b8%89%ef%bc%89","status":"publish","type":"post","link":"https:\/\/boochlin.com\/?p=1288","title":{"rendered":"Funny vote APP \u2013 \u544a\u5225 XML \u8fce\u4f86 Compose \u7684\u75db\u82e6\u8207\u751c\u871c\uff1a\u5f9e\u523b\u756b\u9762\u5230\u649e\u4e0a\u91cd\u7d44\u5730\u7344\uff08\u4e09\uff09"},"content":{"rendered":"

\u4e0a\u4e00\u7bc7\u804a\u5230 2018 \u5e74\uff0c\u6211\u5011\u5728\u8001\u67b6\u69cb\u88e1\u786c\u585e\u4e86 Kotlin 1.2 \u8207 RxJava 2\uff0c\u7e3d\u7b97\u628a\u6eff\u5730\u7684 NullPointerException \u8207\u975e\u540c\u6b65\u56de\u547c\u7a0d\u5fae\u6536\u62fe\u4e86\u4e00\u4e0b\u3002\u4f46\u8001\u5be6\u8aaa\uff0c\u90a3\u6642\u5019\u7684 Android \u958b\u767c\u4f9d\u7136\u662f\u4e00\u5834\u6f2b\u9577\u800c\u75db\u82e6\u7684\u9ad4\u529b\u6d3b\u3002\u6bcf\u523b\u4e00\u500b\u65b0\u756b\u9762\uff0c\u5de5\u7a0b\u5e2b\u5c31\u8981\u5728 Java\/Kotlin \u4ee3\u78bc\u8207\u843d\u843d\u9577\u7684 XML \u6392\u7248\u6a94\u4e4b\u9593\u4f86\u56de\u6a6b\u8df3\uff0c\u5beb\u4e00\u5806\u812b\u8932\u5b50\u653e\u5c41\u7684\u6a23\u677f\u4ee3\u78bc\u3002<\/p>\n

\u4e00\u6643\u773c\uff0c\u6642\u9593\u8df3\u8e8d\u5230\u4e86 2024 \u5e74\u3002\u5728 kotlin-rewrite<\/code> \u5206\u652f\u88e1\uff0cAndroid \u4e16\u754c\u65e9\u5c31\u5929\u7ffb\u5730\u8986\u3002Google \u7aef\u51fa\u4e86\u73fe\u4ee3 Android \u958b\u767c\u7684\u7d42\u6975\u5927\u6bba\u5668\uff1aJetpack Compose\u3002\u5b98\u65b9\u5ba3\u7a31\u9019\u5957\u5ba3\u544a\u5f0f UI \u80fd\u8b93\u958b\u767c\u751f\u7522\u529b\u500d\u589e\uff0c\u544a\u5225\u6240\u6709 XML\uff0c\u7528\u7d14 Kotlin \u641e\u5b9a\u4e00\u5207\u756b\u9762\u3002<\/p>\n

\u300c\u6020\u60f0\u662f\u958b\u767c\u7684\u6e90\u982d\u300d\uff0c\u8eab\u70ba\u4e00\u500b\u80fd\u8eba\u8457\u5c31\u4e0d\u60f3\u5750\u8457\u7684\u5de5\u7a0b\u5e2b\uff0c\u807d\u5230\u80fd\u5c11\u5beb 30 \u4efd XML\uff0c\u773c\u775b\u7acb\u523b\u4eae\u4e86\u8d77\u4f86\u3002\u9019\u7bc7\u5c31\u4f86\u597d\u597d\u804a\u804a\uff0c\u7576\u6211\u5011\u8208\u6c96\u6c96\u544a\u5225\u5341\u5e74\u524d\u7684 XML \u820a\u77f3\u5668\u6642\u4ee3\u3001\u6295\u5954 Compose \u7684\u61f7\u62b1\u5f8c\uff0c\u5230\u5e95\u9ad4\u6703\u5230\u4e86\u4ec0\u9ebc\u6a23\u7684\u723d\u5ea6\uff0c\u53c8\u5728\u5be6\u6a5f\u756b\u9762\u4e0a\u649e\u4e0a\u4e86\u600e\u6a23\u532a\u5937\u6240\u601d\u7684\u300c\u91cd\u7d44\u5730\u7344\u300d\u3002<\/p>\n

\n

\u4e00\u3001 \u56de\u770b 2016\uff1a\u88ab XML \u8207 findViewById \u7d81\u67b6\u7684\u820a\u77f3\u5668\u6642\u4ee3<\/h2>\n

\u5728\u804a Compose \u4e4b\u524d\uff0c\u6211\u5011\u5148\u628a\u5341\u5e74\u524d mvp<\/code> \u5206\u652f\u7684\u8001\u4ee3\u78bc\u6316\u51fa\u4f86\u66ec\u66ec\u592a\u967d\u3002\u5404\u4f4d\u611f\u53d7\u4e00\u4e0b 2016 \u5e74 Android \u5de5\u7a0b\u5e2b\u6bcf\u5929\u4e0a\u73ed\u5230\u5e95\u5728\u904e\u4ec0\u9ebc\u65e5\u5b50\u3002<\/p>\n

\u90a3\u6642\u5019\u8981\u523b\u4e00\u500b\u6295\u7968\u5217\u8868\uff0c\u6211\u5011\u5f97\u5148\u5728 res\/layout\/item_vote_list.xml<\/code> \u88e1\u9762\u624b\u523b\u5e7e\u767e\u884c XML\uff0c\u8a2d\u5b9a\u5404\u7a2e layout_width<\/code>\u3001layout_height<\/code>\u3001margin<\/code> \u8207 padding<\/code>\u3002\u63a5\u8457\uff0c\u5728 Activity \u6216 Adapter \u88e1\u9762\u628a\u9019\u4e9b\u5143\u4ef6\u4e00\u500b\u500b\u300c\u6293\u51fa\u4f86\u300d\uff1a<\/p>\n

\/\/ 2016 \u5e74\u7684\u5178\u578b\u5beb\u6cd5\uff1aButterKnife \u76e4\u7d72\u6d1e\u8207\u7121\u76e1\u7684\u578b\u5225\u5f37\u8f49\npublic class VoteListAdapter extends BaseAdapter {\n    private LayoutInflater inflater;\n    private List<Vote> voteList;\n\n    @Override\n    public View getView(int position, View convertView, ViewGroup parent) {\n        ViewHolder holder;\n        if (convertView == null) {\n            convertView = inflater.inflate(R.layout.item_vote_list, parent, false);\n            holder = new ViewHolder(convertView);\n            convertView.setTag(holder);\n        } else {\n            holder = (ViewHolder) convertView.getTag();\n        }\n\n        Vote vote = voteList.get(position);\n        holder.tvTitle.setText(vote.getTitle());\n        holder.tvVoteCount.setText(String.valueOf(vote.getVoteCount()));\n        \/\/ \u5982\u679c\u624b\u6ed1\u628a R.id.tv_vote_count \u7d81\u6210 TextView\uff0c\u7de8\u8b6f\u5668\u4e0d\u6703\u53eb\uff0c\u8dd1\u8d77\u4f86\u76f4\u63a5 ClassCastException \u70b8\u88c2\n        return convertView;\n    }\n\n    static class ViewHolder {\n        @BindView(R.id.tv_title) TextView tvTitle;\n        @BindView(R.id.tv_vote_count) TextView tvVoteCount;\n        @BindView(R.id.iv_cover) ImageView ivCover;\n        @BindView(R.id.btn_vote) Button btnVote;\n\n        public ViewHolder(View view) {\n            ButterKnife.bind(this, view);\n        }\n    }\n}<\/code><\/pre>\n
\u770b\u8457\u9019\u6bb5\u4ee3\u78bc\uff0c\u6211\u90fd\u66ff\u7576\u5e74\u7684\u81ea\u5df1\u611f\u5230\u5fc3\u9178\u3002\u90a3\u6642\u5019\u6211\u5011\u6bcf\u5929\u90fd\u5728\u5beb\u9019\u7a2e\u6beb\u7121\u610f\u7fa9\u7684\u9ad4\u529b\u6d3b\uff1a<\/p>\n
    \n
  1. \u5169\u5957\u5e73\u884c\u4e16\u754c<\/strong>\uff1aXML \u8ca0\u8cac\u9577\u76f8\uff0cJava \u8ca0\u8cac\u908f\u8f2f\u3002\u53ea\u8981 UI \u8a2d\u8a08\u5e2b\u8aaa\u8981\u628a\u6a19\u984c\u984f\u8272\u6539\u4e00\u4e0b\uff0c\u4f60\u5f97\u5728\u5c08\u6848\u76ee\u9304\u88e1\u7ffb\u51fa\u5c0d\u61c9\u7684 XML\uff1b\u5982\u679c\u8981\u5728\u4ee3\u78bc\u88e1\u52d5\u614b\u96b1\u85cf\u6309\u9215\uff0c\u53c8\u5f97\u5beb\u4e00\u884c btnVote.setVisibility(View.GONE)<\/code>\u3002\u5169\u908a\u53ea\u8981 ID \u62fc\u932f\u4e00\u500b\u5b57\u6bcd\uff0c\u606d\u559c\u4f60\uff0c\u76f4\u63a5\u5728\u4f7f\u7528\u8005\u624b\u6a5f\u4e0a\u9583\u9000\u3002<\/li>\n
  2. \u72c0\u614b\u540c\u6b65\u5730\u7344<\/strong>\uff1aView \u5143\u4ef6\u81ea\u5df1\u662f\u6709\u72c0\u614b\u7684\uff08Stateful\uff09\u3002\u5982\u679c\u8cc7\u6599\u66f4\u65b0\u4e86\uff0c\u4f60\u5f97\u624b\u52d5\u53bb\u547c\u53eb setText<\/code>\u3001setImageResource<\/code>\u3002\u53ea\u8981\u67d0\u500b if-else \u5206\u652f\u6f0f\u5beb\u4e86\u4e00\u884c\uff0c\u756b\u9762\u4e0a\u7684\u6309\u9215\u53ef\u80fd\u5c31\u505c\u5728\u4e0a\u6b21\u7684\u72c0\u614b\u8b8a\u4e0d\u56de\u4f86\u3002<\/li>\n
  3. Adapter \u6a23\u677f\u6c3e\u6feb<\/strong>\uff1a\u5beb\u500b RecyclerView \u6216 ListView\uff0c\u5149\u662f Adapter\u3001ViewHolder\u3001onCreateViewHolder\u3001onBindViewHolder \u5c31\u80fd\u704c\u6c34\u5169\u767e\u884c\u4ee3\u78bc\u3002<\/li>\n<\/ol>\n
    \u9019\u7a2e\u547d\u4ee4\u5f0f UI\uff08Imperative UI\uff09\u7684\u6700\u5927\u554f\u984c\u5728\u65bc\uff1a\u5de5\u7a0b\u5e2b\u5fc5\u9808\u89aa\u624b\u544a\u8a34\u7cfb\u7d71\u300c\u5982\u4f55\u4e00\u6b65\u4e00\u6b65\u53bb\u4fee\u6539 View\u300d<\/strong>\u3002\u53ea\u8981\u7a0b\u5f0f\u7a0d\u5fae\u8907\u96dc\u4e00\u9ede\uff0c\u756b\u9762\u72c0\u614b\u8207\u80cc\u5f8c\u7684\u771f\u5be6\u8cc7\u6599\u4e00\u5b9a\u6703\u812b\u9264\u3002<\/p>\n
    \n
    \u4e8c\u3001 2024 \u521d\u5165 Compose \u7684\u871c\u6708\u671f\uff1a\u7d14 Kotlin \u7684\u6975\u81f4\u723d\u611f<\/h2>\n
    \u7576\u6211\u5011\u5728 kotlin-rewrite<\/code> \u5206\u652f\u628a\u6574\u5957\u820a\u67b6\u69cb\u62c6\u5149\u3001\u5f15\u5165 Jetpack Compose \u4e4b\u5f8c\uff0c\u7b2c\u4e00\u611f\u89ba\u53ea\u6709\u5169\u500b\u5b57\uff1a\u89e3\u812b\u3002<\/p>\n
    \u5728 Compose \u7684\u4e16\u754c\u88e1\uff0c\u6c92\u6709 XML\u3001\u6c92\u6709 ButterKnife\u3001\u6c92\u6709 findViewById<\/code>\uff0c\u751a\u81f3\u9023\u5e7e\u5341\u500b Adapter \u90fd\u76f4\u63a5\u9032\u4e86\u8cc7\u6e90\u56de\u6536\u6876\u3002\u6574\u500b\u5c08\u6848\u552f\u4e00\u7684 MainActivity.kt<\/code>\uff0c\u5f9e\u539f\u672c\u5e7e\u767e\u884c\u7684\u96dc\u4e82\u751f\u547d\u9031\u671f\uff0c\u77ac\u9593\u6536\u6582\u6210\u53ea\u6709 32 \u884c\u7684\u7d14\u5c0e\u822a\u5bb9\u5668\uff1a<\/p>\n
    \/\/ 2024 \u5e74\u7684 MainActivity.kt\uff1a\u4e7e\u6de8\u5230\u8b93\u4eba\u60f3\u54ed\n@AndroidEntryPoint\nclass MainActivity : ComponentActivity() {\n    override fun onCreate(savedInstanceState: Bundle?) {\n        super.onCreate(savedInstanceState)\n        enableEdgeToEdge()\n        setContent {\n            FunnyVoteTheme {\n                Surface(\n                    modifier = Modifier.fillMaxSize(),\n                    color = MaterialTheme.colorScheme.background\n                ) {\n                    val navController = rememberNavController()\n                    AppNavHost(navController = navController)\n                }\n            }\n        }\n    }\n}<\/code><\/pre>\n
    \u9019\u624d\u662f\u73fe\u4ee3\u5de5\u7a0b\u8a72\u6709\u7684\u6a23\u5b50\u3002\u5ba3\u544a\u5f0f UI \u7684\u6838\u5fc3\u601d\u60f3\u975e\u5e38\u7d14\u7cb9\uff1a\u756b\u9762\u53ea\u662f\u72c0\u614b\u7684\u51fd\u6578\uff08UI = f(State)\uff09<\/strong>\u3002\u4f60\u4e0d\u518d\u9700\u8981\u53bb\u6307\u63ee\u6309\u9215\u8981\u96b1\u85cf\u9084\u662f\u986f\u793a\uff0c\u4f60\u53ea\u9700\u8981\u544a\u8a34\u7cfb\u7d71\uff1a\u300c\u7576\u8cc7\u6599\u662f\u9019\u500b\u6a23\u5b50\u6642\uff0c\u756b\u9762\u61c9\u8a72\u9577\u6210\u4ec0\u9ebc\u6a23\u300d\u3002<\/p>\n
    \u4ee5\u524d\u8981\u5beb\u5e7e\u767e\u884c Adapter \u624d\u80fd\u641e\u5b9a\u7684\u6295\u7968\u5217\u8868\uff0c\u5728 Compose \u88e1\u9762\u53ea\u9700\u8981\u4e00\u500b LazyColumn<\/code>\uff1a<\/p>\n
    \/\/ \u7528\u7d14 Kotlin \u523b\u51fa\u4f86\u7684\u6295\u7968\u5361\u7247\u6e05\u55ae\n@Composable\nfun HomeScreenContent(\n    uiState: HomeUiState,\n    onVoteClick: (String) -> Unit,\n    onFavoriteClick: (String) -> Unit,\n    modifier: Modifier = Modifier\n) {\n    LazyColumn(\n        modifier = modifier.fillMaxSize(),\n        contentPadding = PaddingValues(16.dp),\n        verticalArrangement = Arrangement.spacedBy(12.dp)\n    ) {\n        itemsIndexed(\n            items = uiState.votes,\n            key = { _, vote -> vote.voteCode } \/\/ \u7d66\u4e88\u552f\u4e00 Key \u63d0\u5347\u91cd\u7e6a\u6548\u80fd\n        ) { index, vote ->\n            VoteCard(\n                vote = vote,\n                onClick = { onVoteClick(vote.voteCode) },\n                onFavorite = { onFavoriteClick(vote.voteCode) }\n            )\n        }\n    }\n}<\/code><\/pre>\n
    \u5beb\u8d77\u4f86\u771f\u7684\u723d\u611f\u5341\u8db3\u3002\u4ee3\u78bc\u91cf\u4e00\u53e3\u6c23\u780d\u6389\u4e86\u8d85\u904e 60%\uff0c\u800c\u4e14\u5728 Android Studio \u88e1\u9084\u80fd\u76f4\u63a5\u958b @Preview<\/code> \u5373\u6642\u9810\u89bd\u756b\u9762\uff0c\u9023\u7de8\u8b6f\u5b89\u88dd\u5230\u624b\u6a5f\u7684\u6642\u9593\u90fd\u7701\u4e0b\u4f86\u4e86\u3002\u90a3\u5e7e\u5929\u6211\u4e00\u5ea6\u4ee5\u70ba\uff0cAndroid \u958b\u767c\u7684\u82e6\u65e5\u5b50\u7d42\u65bc\u5230\u982d\u4e86\u3002<\/p>\n
    \u4f46\u73fe\u5be6\u7e3d\u662f\u6703\u7d66\u5929\u771f\u7684\u5de5\u7a0b\u5e2b\u4e00\u8a18\u97ff\u4eae\u7684\u8033\u5149\u3002<\/p>\n
    \n
    \u4e09\u3001 \u7ffb\u8eca\u73fe\u5834\uff1a\u5e7d\u9748\u822c\u7684\u91cd\u7d44\u5730\u7344\uff08Recomposition Hell\uff09<\/h2>\n
    \u7576\u6211\u628a\u6838\u5fc3\u5217\u8868\u529f\u80fd\u5beb\u5b8c\uff0c\u8208\u9ad8\u91c7\u70c8\u628a App \u88dd\u9032 Samsung \u5be6\u9ad4\u624b\u6a5f\u628a\u73a9\u6642\uff0c\u6211\u767c\u73fe\u4e0d\u5c0d\u52c1\u4e86\u3002<\/p>\n
    \u53ea\u8981\u624b\u6307\u5411\u4e0a\u4e00\u6ed1\u5217\u8868\uff0c\u756b\u9762\u7adf\u7136\u96b1\u96b1\u7d04\u7d04\u6709\u5361\u9813\u6389\u5e40\u7684\u611f\u89ba\u3002\u660e\u660e\u9019\u652f\u624b\u6a5f\u914d\u5099\u9802\u7d1a\u9ad8\u901a\u6676\u7247\uff0c\u87a2\u5e55\u652f\u63f4 120Hz \u5237\u65b0\u7387\uff0c\u6ed1\u4e00\u500b\u53ea\u6709\u5e7e\u5341\u5f35\u5361\u7247\u7684\u6295\u7968\u6e05\u55ae\uff0c\u70ba\u4ec0\u9ebc\u624b\u6307\u611f\u89ba\u6c89\u6c89\u7684\u3001\u5076\u723e\u9084\u6703\u5361\u8df3\u4e00\u4e0b\uff1f<\/p>\n
    \u6211\u7acb\u523b\u6253\u958b Android Studio \u7684 Layout Inspector\uff0c\u958b\u555f Compose \u7684\u91cd\u7d44\u8a08\u6578\u5668\uff08Recomposition Counter\uff09\u3002\u4e0d\u770b\u9084\u597d\uff0c\u4e00\u770b\u8840\u58d3\u76f4\u63a5\u98c6\u9ad8\uff1a<\/p>\n
    \u7576\u6211\u624b\u6307\u5728\u87a2\u5e55\u4e0a\u6ed1\u52d5\u6642\uff0c\u6bcf\u4e00\u500b\u53ef\u898b\u7684 VoteCard \u7adf\u7136\u90fd\u5728\u767c\u4e86\u760b\u4f3c\u5730\u760b\u72c2\u91cd\u7d44\uff08Recompose\uff09\uff01\u91cd\u7d44\u6b21\u6578\u4ee5\u6bcf\u79d2\u5e7e\u5341\u6b21\u7684\u983b\u7387\u72c2\u98c6\uff0c\u8a08\u6578\u5668\u8df3\u5f97\u6bd4\u8df3\u8868\u6a5f\u9084\u5feb\uff01<\/strong><\/p>\n
    \u5728 Compose \u7684\u8a2d\u8a08\u7406\u5ff5\u4e2d\uff0c\u5982\u679c\u50b3\u5165 Composable \u5143\u4ef6\u7684\u53c3\u6578\u6c92\u6709\u6539\u8b8a\uff0c\u7cfb\u7d71\u61c9\u8a72\u81ea\u52d5\u8df3\u904e\u91cd\u7d44\uff08Skip\uff09\uff0c\u53ea\u66f4\u65b0\u771f\u6b63\u8b8a\u52d5\u7684\u5340\u584a\u3002\u70ba\u4ec0\u9ebc\u6211\u7684\u5361\u7247\u660e\u660e\u9577\u5f97\u4e00\u6a21\u4e00\u6a23\uff0cCompose \u537b\u628a\u6574\u5f35\u5361\u7247\u5f9e\u982d\u5230\u5c3e\u91cd\u65b0\u7e6a\u88fd\u4e86\u4e00\u904d\uff1f<\/p>\n
    \u7d93\u904e\u5169\u5929\u7684\u6392\u67e5\u8207\u6df1\u6316\uff0c\u6211\u7d42\u65bc\u63ea\u51fa\u4e86\u5169\u96bb\u85cf\u5728\u4ee3\u78bc\u6df1\u8655\u7684\u6548\u80fd\u5438\u8840\u9b3c\u3002<\/p>\n
    \u5438\u8840\u9b3c\u4e00\uff1aKotlin \u6a19\u6e96 List \u7adf\u7136\u88ab\u5224\u5b9a\u70ba\u300c\u4e0d\u7a69\u5b9a\uff08Unstable\uff09\u300d<\/h3>\n
    \u9019\u662f\u6211\u5728 Compose \u8e29\u904e\u6700\u53cd\u76f4\u89ba\u7684\u4e00\u500b\u5751\u3002\u8acb\u770b\u6211\u5011\u525b\u525b\u50b3\u9032 Composable \u7684\u8cc7\u6599\u7d50\u69cb\uff1a<\/p>\n
    \/\/ \u770b\u4f3c\u7121\u8f9c\u7684\u8cc7\u6599\u6a21\u578b\ndata class HomeUiState(\n    val isLoading: Boolean = false,\n    val votes: List<VoteWithDetails> = emptyList() \/\/ \u5c31\u662f\u9019\u884c\u91c0\u6210\u5927\u798d\n)<\/code><\/pre>\n
    \u5927\u5bb6\u4ed4\u7d30\u770b votes: List<VoteWithDetails><\/code> \u9019\u884c\u3002\u5728 Kotlin \u88e1\u9762\uff0cList<\/code> \u8868\u9762\u4e0a\u662f\u500b\u552f\u8b80\u4ecb\u9762\uff0c\u6211\u5011\u7406\u6240\u7576\u7136\u89ba\u5f97\u5b83\u662f\u4e0d\u53ef\u8b8a\u7684\u3002<\/p>\n
    \u4f46\u5728 JVM \u5e95\u5c64\uff0cKotlin \u7684 List<\/code> \u5176\u5be6\u7de8\u8b6f\u5f8c\u5c31\u662f java.util.List<\/code>\uff01Java \u7684 List \u672c\u8cea\u4e0a\u662f\u53ef\u4ee5\u88ab\u96a8\u6642 add()<\/code> \u6216 clear()<\/code> \u7684\u53ef\u8b8a\u7269\u4ef6\u3002\u56e0\u6b64\uff0cCompose \u7de8\u8b6f\u5668\u5728\u9032\u884c\u975c\u614b\u5206\u6790\u6642\uff0c\u63a1\u53d6\u4e86\u6975\u5ea6\u4fdd\u5b88\u7684\u7b56\u7565\uff1a\u5b83\u628a\u6a19\u6e96\u7684 List<T><\/code> \u5224\u5b9a\u70ba Unstable\uff08\u4e0d\u7a69\u5b9a\u578b\u5225\uff09\uff01<\/strong><\/p>\n
    \u9019\u610f\u5473\u8457\u4ec0\u9ebc\uff1f\u9019\u610f\u5473\u8457 Compose \u7de8\u8b6f\u5668\u6839\u672c\u4e0d\u6562\u76f8\u4fe1\u9019\u500b List \u6c92\u6709\u88ab\u4eba\u5728\u5916\u90e8\u5077\u6539\u3002\u6240\u4ee5\u53ea\u8981\u7236\u5c64 Composable \u6709\u4efb\u4f55\u98a8\u5439\u8349\u52d5\uff08\u6bd4\u5982\u6ed1\u52d5\u6642\u7a0d\u5fae\u66f4\u65b0\u4e86\u6372\u8ef8\u4f4d\u7f6e\uff09\uff0cCompose \u5c31\u6703\u6b66\u65b7\u5730\u8a8d\u70ba\uff1a\u300c\u9019\u500b List \u53ef\u80fd\u5df2\u7d93\u8b8a\u4e86\uff0c\u6211\u4e0d\u80fd\u8df3\u904e\uff0c\u5fc5\u9808\u5f37\u5236\u5168\u91cf\u91cd\u65b0\u7e6a\u88fd\uff01\u300d<\/p>\n
    \u6bcf\u6ed1\u4e00\u4e0b\u87a2\u5e55\uff0c\u5e7e\u5341\u500b\u5361\u7247\u88e1\u7684\u5716\u7247\u5143\u4ef6\u3001\u6587\u5b57\u5143\u4ef6\u3001\u6392\u7248\u8a08\u7b97\u5168\u90e8\u91cd\u65b0\u57f7\u884c\u4e00\u6b21\uff0c\u6676\u7247\u904b\u7b97\u77ac\u9593\u62c9\u6eff\uff0c\u4e0d\u5361\u9813\u624d\u602a\uff01<\/p>\n
    [\u89e3\u6cd5\uff1a\u624b\u52d5\u5957\u4e0a\u4e0d\u53ef\u8b8a\u91d1\u7b8d\u68d2]<\/p>\n
    \u89e3\u6c7a\u9019\u500b\u554f\u984c\u6709\u5169\u7a2e\u4e3b\u6d41\u6d41\u6d3e\u3002\u7b2c\u4e00\u7a2e\u662f\u5f15\u5165 kotlinx.collections.immutable<\/code>\uff0c\u628a\u6a19\u6e96 List \u66ff\u63db\u70ba\u771f\u6b63\u7684\u4e0d\u53ef\u8b8a\u5217\u8868 ImmutableList<\/code>\uff1a<\/p>\n
    \/\/ \u65b9\u6848 A\uff1a\u4f7f\u7528\u771f\u6b63\u7684\u4e0d\u53ef\u8b8a\u8cc7\u6599\u7d50\u69cb\nimport kotlinx.collections.immutable.ImmutableList\nimport kotlinx.collections.immutable.persistentListOf\n\ndata class HomeUiState(\n    val isLoading: Boolean = false,\n    val votes: ImmutableList<VoteWithDetails> = persistentListOf()\n)<\/code><\/pre>\n
    \u7b2c\u4e8c\u7a2e\u662f\u5982\u679c\u4e0d\u60f3\u5f15\u5165\u984d\u5916\u4f9d\u8cf4\u5eab\uff0c\u53ef\u4ee5\u5728\u8cc7\u6599\u5305\u5916\u5c64\u6253\u4e0a @Immutable<\/code> \u6216 @Stable<\/code> \u8a3b\u89e3\uff0c\u5411 Compose \u7de8\u8b6f\u5668\u767c\u8a93\u4fdd\u8b49\uff1a\u300c\u6211\u9019\u5305\u8cc7\u6599\u53ea\u8981\u5efa\u51fa\u4f86\u5c31\u7d55\u4e0d\u6703\u8b8a\uff0c\u8acb\u4f60\u5927\u81bd\u958b\u555f\u8df3\u904e\u91cd\u7d44\uff08Smart Recomposition\uff09\u512a\u5316\u300d\uff1a<\/p>\n
    \/\/ \u65b9\u6848 B\uff1a\u7528\u8a3b\u89e3\u5411\u7de8\u8b6f\u5668\u7acb\u4e0b\u5207\u7d50\u66f8\n@Immutable\ndata class HomeUiState(\n    val isLoading: Boolean = false,\n    val votes: List<VoteWithDetails> = emptyList()\n)<\/code><\/pre>\n
    \u52a0\u4e86\u9019\u884c\u8a3b\u89e3\u4e4b\u5f8c\uff0c\u56de\u5230 Layout Inspector \u4e00\u770b\uff0c\u91cd\u7d44\u8a08\u6578\u5668\u77ac\u9593\u5b89\u975c\u4e86\u4e0b\u4f86\u3002\u5361\u7247\u4e0d\u518d\u7121\u8166\u91cd\u7e6a\uff0c\u5217\u8868\u6ed1\u52d5\u7acb\u523b\u9806\u6ed1\u5982\u7d72\u3002<\/p>\n
    \n
    \u5438\u8840\u9b3c\u4e8c\uff1a\u5728 LazyColumn \u8ff4\u5708\u5167\u5ba3\u544a Lambda \u5be6\u4f8b<\/h3>\n
    \u641e\u5b9a List \u7684\u7a69\u5b9a\u6027\u4e4b\u5f8c\uff0c\u6211\u767c\u73fe\u5361\u7247\u9084\u662f\u5076\u723e\u6703\u8df3\u52d5\u3002\u518d\u770b\u4ee3\u78bc\uff0c\u6293\u5230\u4e86\u7b2c\u4e8c\u500b\u96b1\u5f62\u5730\u96f7\uff1a<\/p>\n
    \/\/ \u7ffb\u8eca\u5beb\u6cd5\uff1a\u5728\u6bcf\u6b21\u7e6a\u88fd\u6642\u91cd\u65b0\u751f\u6210 Lambda\nitemsIndexed(uiState.votes) { index, vote ->\n    VoteCard(\n        vote = vote,\n        onClick = { onVoteClick(vote.voteCode) }, \/\/ \u6bcf\u6b21\u7236\u5c64\u91cd\u7e6a\uff0c\u9019\u88e1\u90fd\u6703 new \u51fa\u4e00\u500b\u65b0\u7684 Function \u7269\u4ef6\uff01\n        onFavorite = { onFavoriteClick(vote.voteCode) }\n    )\n}<\/code><\/pre>\n
    \u5f88\u591a\u521d\u5b78 Compose \u7684\u4eba\uff08\u5305\u62ec\u525b\u4e0a\u624b\u7684\u6211\uff09\u5f88\u5bb9\u6613\u5ffd\u7565\uff1aonClick = { ... }<\/code> \u5beb\u5728\u8ff4\u5708\u6216 Composable \u88e1\u9762\uff0c\u6bcf\u4e00\u6b21\u91cd\u7e6a\u90fd\u6703\u7522\u751f\u4e00\u500b\u5168\u65b0\u8a18\u61b6\u9ad4\u4f4d\u5740\u7684 Lambda \u5be6\u4f8b\u3002\u5c0d\u65bc VoteCard<\/code> \u4f86\u8aaa\uff0c\u96d6\u7136 vote<\/code> \u7269\u4ef6\u6c92\u8b8a\uff0c\u4f46\u50b3\u9032\u4f86\u7684 onClick<\/code> \u53c3\u6578\u8a18\u61b6\u9ad4\u4f4d\u5740\u6bcf\u4e00\u6b21\u90fd\u4e0d\u540c\uff0cCompose \u7576\u7136\u53ea\u80fd\u5224\u65b7\u300c\u53c3\u6578\u6539\u8b8a\u4e86\uff0c\u5fc5\u9808\u91cd\u65b0\u7e6a\u88fd\u300d\u3002<\/p>\n
    \u6a19\u6e96\u7684\u89e3\u6cd5\u662f\u5584\u7528\u65b9\u6cd5\u5f15\u7528\uff0c\u6216\u8005\u5c07\u9ede\u64ca\u4e8b\u4ef6\u63d0\u5347\u5230\u5361\u7247\u5167\u90e8\uff0c\u628a\u8b58\u5225\u78bc\u76f4\u63a5\u4ea4\u7d66\u4e0b\u6e38\uff1a<\/p>\n
    \/\/ \u6b63\u78ba\u505a\u6cd5\uff1a\u4fdd\u6301\u56de\u547c\u7a69\u5b9a\uff0c\u907f\u514d\u7121\u6548\u7269\u4ef6\u5206\u914d\nVoteCard(\n    vote = vote,\n    onVoteClick = onVoteClick, \/\/ \u50b3\u905e\u7a69\u5b9a\u7684\u9ad8\u968e\u51fd\u5f0f\u5f15\u7528\n    onFavoriteClick = onFavoriteClick\n)<\/code><\/pre>\n
    \n
    \u56db\u3001 \u756b\u9762\u96d6\u7136\u9806\u4e86\uff0c\u4f46\u72c0\u614b\u958b\u59cb\u7fa4\u9b54\u4e82\u821e<\/h2>\n
    \u7576\u6211\u5011\u628a Compose \u7684\u91cd\u7d44\u5730\u7344\u64fa\u5e73\u3001\u6548\u80fd\u62c9\u6eff\u5230 120Hz \u4e4b\u5f8c\uff0c\u539f\u672c\u4ee5\u70ba\u53ef\u4ee5\u958b\u9999\u6ab3\u6176\u795d\u4e86\u3002<\/p>\n
    \u4f46\u7576\u6211\u5011\u958b\u59cb\u5728 ViewModel \u88e1\u9762\u5beb\u5be6\u969b\u7684\u696d\u52d9\u908f\u8f2f\u6642\uff0c\u53e6\u4e00\u500b\u66f4\u96b1\u853d\u3001\u66f4\u81f4\u547d\u7684\u67b6\u69cb\u7f3a\u9677\uff0c\u6084\u6084\u6d6e\u4e0a\u4e86\u6c34\u9762\u3002<\/p>\n
    \u90a3\u6642\u5019\u6211\u5011\u5ef6\u7e8c\u4e86\u50b3\u7d71 MVVM \u7684\u601d\u7dad\u7fd2\u6163\uff0c\u5728 ViewModel \u88e1\u9762\u96a8\u624b\u958b\u51fa\u4e86\u597d\u5e7e\u500b\u7368\u7acb\u7684 MutableStateFlow<\/code>\uff1a<\/p>\n
    \/\/ \u50b3\u7d71 MVVM \u5728 Compose \u88e1\u7684\u707d\u96e3\u524d\u594f\nclass HomeViewModel @Inject constructor(\n    private val voteRepository: VoteRepository\n) : ViewModel() {\n    private val _isLoading = MutableStateFlow(false)\n    val isLoading = _isLoading.asStateFlow()\n\n    private val _votes = MutableStateFlow<List<VoteWithDetails>>(emptyList())\n    val votes = _votes.asStateFlow()\n\n    private val _errorMessage = MutableStateFlow<String?>(null)\n    val errorMessage = _errorMessage.asStateFlow()\n\n    fun loadVotes() {\n        viewModelScope.launch {\n            _isLoading.value = true\n            try {\n                _votes.value = voteRepository.fetchVotes()\n                _errorMessage.value = null\n            } catch (e: Exception) {\n                _errorMessage.value = e.message\n            } finally {\n                _isLoading.value = false\n            }\n        }\n    }\n}<\/code><\/pre>\n
    \u9019\u6bb5\u4ee3\u78bc\u5728\u50b3\u7d71 XML \u6642\u4ee3\u770b\u8d77\u4f86\u6beb\u7121\u6bdb\u75c5\u3002\u4f46\u5728\u5ba3\u544a\u5f0f UI \u7684\u4e16\u754c\u88e1\uff0c\u9019\u6bb5\u4ee3\u78bc\u5f15\u767c\u4e86\u4e00\u5834\u56b4\u91cd\u7684\u707d\u96e3\uff1a\u756b\u9762\u72c0\u614b\u6253\u67b6\uff08\u72c0\u614b\u6495\u88c2\uff09<\/strong>\u3002<\/p>\n
    \u56e0\u70ba\u9019\u4e09\u500b StateFlow \u662f\u5404\u81ea\u7368\u7acb\u767c\u5c04\u7684\uff0c\u5728\u975e\u540c\u6b65\u5354\u7a0b\u5207\u63db\u57f7\u884c\u7dd2\u7684\u5fae\u5c0f\u6642\u9593\u5dee\u88e1\uff0cCompose \u654f\u92b3\u5730\u6355\u6349\u5230\u4e86\u597d\u5e7e\u7a2e\u8352\u8b2c\u7684\u4e2d\u9593\u72c0\u614b\uff1a
    \n1. \u8f49\u5708\u5708\u7d50\u675f\u4e86\uff0c\u4f46\u8cc7\u6599\u9084\u6c92\u66f4\u65b0\uff1a\u756b\u9762\u77ed\u66ab\u9583\u720d\u6210\u4e00\u7247\u7a7a\u767d\u3002
    \n2. \u7db2\u8def\u5831\u932f\u8a0a\u606f\u8df3\u51fa\u4f86\u4e86\uff0c\u4f46\u820a\u7684\u8cc7\u6599\u4f9d\u7136\u505c\u5728\u87a2\u5e55\u4e0a\uff0c\u5169\u500b\u5143\u4ef6\u649e\u5728\u4e00\u8d77\u3002
    \n3. \u624b\u6a5f\u7a0d\u5fae\u65cb\u8f49\u4e00\u4e0b\u87a2\u5e55\uff0c\u932f\u8aa4\u63d0\u793a\u91cd\u8907\u5f48\u51fa\u4e09\u6b21\uff0c\u5c0e\u822a\u91cd\u8907\u8df3\u8f49\u3002<\/p>\n
    \u770b\u8457\u756b\u9762\u4e0a\u9019\u4e9b\u5ffd\u96b1\u5ffd\u73fe\u7684\u5e7d\u9748\u72c0\u614b\uff0c\u6211\u7d42\u65bc\u610f\u8b58\u5230\uff1a\u55ae\u7d14\u63db\u6210 Compose \u53ea\u662f\u63db\u4e86\u5916\u76ae\uff1b\u5982\u679c\u4e0d\u628a\u7ba1\u7406\u72c0\u614b\u7684\u67b6\u69cb\u5fb9\u5e95\u6539\u9020\uff0c\u5ba3\u544a\u5f0f UI \u53ea\u6703\u628a\u820a\u7cfb\u7d71\u7684\u72c0\u614b\u6df7\u4e82\u653e\u5927\u5341\u500d\u3002<\/strong><\/p>\n
    \n
    \u4e94\u3001 \u7d50\u5c3e\uff1a\u7d66\u4e0b\u4e00\u6b21\u9032\u5316\u7684\u5f15\u5b50<\/h2>\n
    \u5f9e 2016 \u5e74\u624b\u6572 30 \u4efd XML \u7684\u82e6\u884c\u50e7\uff0c\u5230 2024 \u5e74\u7528\u7d14 Kotlin \u8207 LazyColumn<\/code> \u523b\u51fa\u6d41\u66a2\u7684\u73fe\u4ee3\u756b\u9762\uff0c\u6211\u5011\u5728 Compose \u4e0a\u5403\u8db3\u4e86\u82e6\u982d\uff0c\u4e5f\u5690\u5230\u4e86\u524d\u6240\u672a\u6709\u7684\u751c\u982d\u3002<\/p>\n
    \u6211\u5011\u5b78\u6703\u4e86\u4e0d\u8981\u88ab\u770b\u4f3c\u552f\u8b80\u7684 List<\/code> \u6b3a\u9a19\uff0c\u5b78\u6703\u4e86\u7528 @Immutable<\/code> \u99b4\u670d\u904e\u52d5\u7684\u7de8\u8b6f\u5668\uff0c\u4e5f\u5b78\u6703\u4e86\u5728 120Hz \u7684\u9ad8\u5237\u87a2\u5e55\u4e0a\u8ffd\u6c42\u6975\u81f4\u7684\u5e40\u7387\u7a69\u5b9a\u3002<\/p>\n
    \u4f46\u662f\uff0c\u756b\u9762\u523b\u5f97\u518d\u6f02\u4eae\uff0c\u53ea\u8981\u5e95\u5c64\u7684\u72c0\u614b\u5728\u6253\u67b6\uff0c\u9019\u500b App \u5c31\u662f\u500b\u96a8\u6642\u6703\u5d29\u6f70\u7684\u534a\u6210\u54c1\u3002\u70ba\u4e86\u5fb9\u5e95\u6d88\u6ec5\u90a3\u5e7e\u500b\u5404\u81ea\u70ba\u653f\u7684 StateFlow\uff0c\u70ba\u4e86\u675c\u7d55\u756b\u9762\u9583\u720d\u8207\u5e7d\u9748\u4e2d\u9593\u614b\uff0c\u6211\u5011\u5728\u63a5\u4e0b\u4f86\u7684 mvi-rewrite<\/code> \u5206\u652f\u88e1\uff0c\u5c55\u958b\u4e86\u4e00\u5834\u76f4\u5954 MVI \u55ae\u5411\u8cc7\u6599\u6d41\u7684\u67b6\u69cb\u5927\u624b\u8853\u3002<\/p>\n
    \u81f3\u65bc\u6211\u5011\u662f\u600e\u9ebc\u7528\u55ae\u4e00\u4e0d\u53ef\u8b8a\u72c0\u614b\u8207\u9ede\u9910\u865f\u78bc\u724c\u6a5f\u5236\u6536\u62fe\u9019\u500b\u721b\u6524\u5b50\u7684\uff0c\u6211\u5011\u4e0b\u4e00\u7bc7\u898b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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