{"id":113983,"date":"2026-10-08T06:25:00","date_gmt":"2026-10-07T22:25:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/113983.html"},"modified":"2026-10-08T06:25:00","modified_gmt":"2026-10-07T22:25:00","slug":"%e3%80%90jetpack-compose%e5%a3%b0%e6%98%8e%e5%bc%8fui%e7%95%8c%e9%9d%a2%e5%bc%80%e5%8f%91%e5%ae%9e%e7%94%a8%e6%8a%80%e6%9c%af%e5%ad%a6%e4%b8%8e%e7%bb%83%e3%80%91%e7%ac%ac-1-%e8%af%be%ef%bc%9a%e4%bb%8e","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/113983.html","title":{"rendered":"\u3010Jetpack Compose\u58f0\u660e\u5f0fUI\u754c\u9762\u5f00\u53d1\u5b9e\u7528\u6280\u672f\u5b66\u4e0e\u7ec3\u3011\u7b2c 1 \u8bfe\uff1a\u4ece\u547d\u4ee4\u5f0f\u5230\u58f0\u660e\u5f0f\u2014\u2014\u73af\u5883\u642d\u5efa\u4e0e\u7b2c\u4e00\u4e2a Compose \u754c\u9762"},"content":{"rendered":"

\u672c\u8bfe\u5b9a\u4f4d： \u8fd9\u662f\u6574\u4e2a\u7cfb\u5217\u7684\u5730\u57fa\u3002\u7b2c 1 \u8bfe\u4e0d\u8ffd\u6c42\u8986\u76d6\u6240\u6709 API，\u800c\u662f\u5efa\u7acb\u6b63\u786e\u7684 Compose \u5fc3\u667a\u6a21\u578b\u3002\u540e\u9762\u6240\u6709\u8bfe\u7a0b\u2014\u2014\u5e03\u5c40\u3001\u72b6\u6001\u3001\u5bfc\u822a\u3001\u67b6\u6784\u3001\u6027\u80fd\u2014\u2014\u90fd\u5efa\u7acb\u5728\u672c\u8bfe\u7684\u6982\u5ff5\u4e4b\u4e0a\u3002\u5982\u679c\u672c\u8bfe\u7684\u6982\u5ff5\u6ca1\u5403\u900f，\u540e\u9762\u5f88\u5bb9\u6613\u5199\u6210"\u7528 Compose \u5199 View"\u3002<\/p>\n

\n

\u4e00\u3001\u672c\u8bfe\u76ee\u6807<\/h3>\n

\u5b66\u5b8c\u672c\u8bfe，\u4f60\u5e94\u8be5\u80fd\u591f：<\/p>\n

  • \u7406\u89e3\u547d\u4ee4\u5f0f UI \u4e0e\u58f0\u660e\u5f0f UI \u7684\u672c\u8d28\u533a\u522b\u3002<\/li>\n
  • \u7406\u89e3 Compose \u7684\u6838\u5fc3\u516c\u5f0f：UI = f(state)\u3002<\/li>\n
  • \u4f7f\u7528 Android Studio \u521b\u5efa Jetpack Compose \u9879\u76ee\u3002<\/li>\n
  • \u7406\u89e3 @Composable\u3001setContent\u3001@Preview \u7684\u4f5c\u7528\u3002<\/li>\n
  • \u4f7f\u7528 Text\u3001Button\u3001Column\u3001Row\u3001Modifier \u7f16\u5199\u7b80\u5355\u754c\u9762\u3002<\/li>\n
  • \u4f7f\u7528 remember \u548c mutableStateOf \u5b9e\u73b0\u8ba1\u6570\u5668\u3002<\/li>\n
  • \u521d\u6b65\u7406\u89e3\u7ec4\u5408\u3001\u91cd\u7ec4\u3001\u72b6\u6001\u8bfb\u53d6\u8ffd\u8e2a\u3001\u4f4d\u7f6e\u8bb0\u5fc6\u3002<\/li>\n
  • \u521d\u6b65\u638c\u63e1\u72b6\u6001\u63d0\u5347\u4e0e\u5355\u5411\u6570\u636e\u6d41\u3002<\/li>\n
    \n

    \u4e8c\u3001\u547d\u4ee4\u5f0f UI \u4e0e\u58f0\u660e\u5f0f UI \u7684\u672c\u8d28\u533a\u522b<\/h3>\n

    2.1 \u547d\u4ee4\u5f0f UI：\u624b\u52a8\u627e\u63a7\u4ef6，\u624b\u52a8\u6539\u63a7\u4ef6<\/h4>\n

    \u4f20\u7edf Android View \u5199\u6cd5：<\/p>\n

    val<\/span> textView =<\/span> findViewById<<\/span>TextView><\/span>(<\/span>R.<\/span>id.<\/span>textView)<\/span>
    \nval<\/span> button =<\/span> findViewById<<\/span>Button><\/span>(<\/span>R.<\/span>id.<\/span>button)<\/span><\/p>\n

    var<\/span> count =<\/span> 0<\/span><\/p>\n

    button.<\/span>setOnClickListener<\/span> {<\/span>
    \n count++<\/span>
    \n textView.<\/span>text =<\/span> "\u70b9\u51fb\u6b21\u6570：<\/span>$<\/span>count<\/span><\/span>"<\/span><\/span>
    \n}<\/span><\/p>\n

    \u8fd9\u6bb5\u4ee3\u7801\u6709\u4e24\u4e2a\u6838\u5fc3\u95ee\u9898：<\/p>\n

  • \u72b6\u6001\u548c\u89c6\u56fe\u662f\u5206\u79bb\u7684\u3002 count \u662f\u72b6\u6001，TextView \u662f\u89c6\u56fe，\u4f60\u9700\u8981\u624b\u52a8\u4fdd\u6301\u5b83\u4eec\u4e00\u81f4\u3002<\/li>\n
  • \u6bcf\u6b21\u72b6\u6001\u53d8\u5316，\u90fd\u8981\u624b\u52a8\u66f4\u65b0\u5bf9\u5e94\u89c6\u56fe\u3002 \u5982\u679c\u754c\u9762\u6709 10 \u4e2a\u5730\u65b9\u4f9d\u8d56 count，\u4f60\u5c31\u8981\u5199 10 \u6b21\u66f4\u65b0\u903b\u8f91\u3002\u6f0f\u6389\u4e00\u4e2a，\u754c\u9762\u5c31\u9519\u4e86\u3002<\/li>\n

    \u547d\u4ee4\u5f0f UI \u7684\u672c\u8d28：<\/p>\n

    \u6211\u544a\u8bc9\u7cfb\u7edf：\u5148\u521b\u5efa\u8fd9\u4e2a\u63a7\u4ef6，\u518d\u627e\u5230\u5b83，\u518d\u4fee\u6539\u5b83\u3002<\/p>\n

    2.2 \u58f0\u660e\u5f0f UI：\u63cf\u8ff0\u754c\u9762，\u6846\u67b6\u8d1f\u8d23\u66f4\u65b0<\/h4>\n

    Compose \u7684\u6838\u5fc3\u601d\u60f3：<\/p>\n

    UI = f(state)<\/p>\n

    \u610f\u601d\u662f：\u754c\u9762\u662f\u72b6\u6001\u7684\u51fd\u6570\u3002<\/p>\n

    \u4f60\u53ea\u63cf\u8ff0：<\/p>\n

      \n
    • \u5f53\u72b6\u6001\u662f A \u65f6，\u754c\u9762\u5e94\u8be5\u957f\u4ec0\u4e48\u6837\u3002<\/li>\n
    • \u5f53\u72b6\u6001\u53d8\u6210 B \u65f6，\u754c\u9762\u5e94\u8be5\u957f\u4ec0\u4e48\u6837\u3002<\/li>\n<\/ul>\n

      \u4f60\u4e0d\u9700\u8981\u624b\u52a8\u627e\u63a7\u4ef6，\u4e5f\u4e0d\u9700\u8981\u624b\u52a8\u6539\u63a7\u4ef6\u3002\u72b6\u6001\u53d8\u5316\u540e，Compose \u4f1a\u91cd\u65b0\u6267\u884c\u76f8\u5173 @Composable \u51fd\u6570，\u81ea\u52a8\u66f4\u65b0\u754c\u9762\u3002<\/p>\n

      @Composable<\/span>
      \nfun<\/span> Counter<\/span>(<\/span>)<\/span> {<\/span>
      \n var<\/span> count by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

      Column {<\/span>
      \n Text<\/span>(<\/span>"\u70b9\u51fb\u6b21\u6570：<\/span>$<\/span>count<\/span><\/span>"<\/span><\/span>)<\/span>
      \n Button<\/span>(<\/span>onClick =<\/span> {<\/span> count++<\/span> }<\/span>)<\/span> {<\/span>
      \n Text<\/span>(<\/span>"+1"<\/span><\/span>)<\/span>
      \n }<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      \u8fd9\u91cc\u4f60\u53ea\u5199\u4e86"\u754c\u9762\u5982\u4f55\u6839\u636e count \u663e\u793a"\u3002\u5f53 count \u53d8\u5316\u65f6，Text \u81ea\u52a8\u5237\u65b0\u3002<\/p>\n

      2.3 \u58f0\u660e\u5f0f\u4e0d\u662f\u6ca1\u6709\u547d\u4ee4，\u800c\u662f\u547d\u4ee4\u88ab\u6846\u67b6\u63a5\u7ba1<\/h4>\n

      Compose \u5e95\u5c42\u4ecd\u7136\u8981\u521b\u5efa\u8282\u70b9\u3001\u6d4b\u91cf\u3001\u5e03\u5c40\u3001\u7ed8\u5236\u3002\u4f46\u8fd9\u4e9b\u547d\u4ee4\u4e0d\u518d\u7531\u4f60\u624b\u5199，\u800c\u662f\u7531 Compose \u8fd0\u884c\u65f6\u6839\u636e\u4f60\u7684\u58f0\u660e\u81ea\u52a8\u5b8c\u6210\u3002<\/p>\n

      \u66f4\u51c6\u786e\u7684\u7406\u89e3：<\/p>\n

      \u4f60\u8d1f\u8d23\u58f0\u660e UI \u4e0e\u72b6\u6001\u7684\u5173\u7cfb；
      \nCompose \u8d1f\u8d23\u5728\u72b6\u6001\u53d8\u5316\u65f6，\u4ee5\u6700\u5c0f\u4ee3\u4ef7\u66f4\u65b0 UI\u3002<\/p>\n

      2.4 \u4e00\u5f20\u5bf9\u6bd4\u8868<\/h4>\n\n\u7ef4\u5ea6\u547d\u4ee4\u5f0f View\u58f0\u660e\u5f0f Compose<\/tr>\n\n\n\n\n\n\n\n
      \u754c\u9762\u6765\u6e90<\/td>\nXML + \u624b\u52a8 findViewById<\/td>\n@Composable \u51fd\u6570<\/td>\n<\/tr>\n
      \u72b6\u6001\u4e0e\u89c6\u56fe<\/td>\n\u5206\u79bb，\u9700\u624b\u52a8\u540c\u6b65<\/td>\n\u72b6\u6001\u9a71\u52a8，\u81ea\u52a8\u540c\u6b65<\/td>\n<\/tr>\n
      \u66f4\u65b0\u65b9\u5f0f<\/td>\n\u624b\u52a8\u8c03\u7528 setText \u7b49<\/td>\n\u72b6\u6001\u53d8\u5316\u89e6\u53d1\u91cd\u7ec4<\/td>\n<\/tr>\n
      \u590d\u7528\u5355\u4f4d<\/td>\n\u81ea\u5b9a\u4e49 View \/ \u5e03\u5c40<\/td>\nComposable \u51fd\u6570<\/td>\n<\/tr>\n
      \u7ec4\u5408\u65b9\u5f0f<\/td>\n\u7ee7\u627f\u3001\u7ec4\u5408<\/td>\n\u51fd\u6570\u8c03\u7528\u3001\u7ec4\u5408<\/td>\n<\/tr>\n
      \u9884\u89c8<\/td>\nXML Preview<\/td>\n@Preview<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      2.5 \u601d\u7ef4\u65b9\u5f0f\u7684\u8f6c\u53d8<\/h4>\n

      \u4ece\u547d\u4ee4\u5f0f\u8f6c\u5411\u58f0\u660e\u5f0f，\u6700\u5927\u7684\u6311\u6218\u4e0d\u662f API，\u800c\u662f\u601d\u7ef4\u4e60\u60ef：<\/p>\n\n\u547d\u4ee4\u5f0f\u601d\u7ef4\u58f0\u660e\u5f0f\u601d\u7ef4<\/tr>\n\n\n\n\n\n
      \u6211\u8981\u628a\u6587\u5b57\u6539\u6210"5"<\/td>\n\u5f53 count \u662f 5 \u65f6，\u6587\u5b57\u663e\u793a"5"<\/td>\n<\/tr>\n
      \u6211\u8981\u628a\u6309\u94ae\u9690\u85cf<\/td>\n\u5f53\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6，\u6309\u94ae\u4e0d\u5b58\u5728<\/td>\n<\/tr>\n
      \u6211\u8981\u628a\u989c\u8272\u6539\u6210\u7ea2\u8272<\/td>\n\u5f53\u72b6\u6001\u662f\u8b66\u544a\u65f6，\u989c\u8272\u662f\u7ea2\u8272<\/td>\n<\/tr>\n
      \u5148\u505a\u4ec0\u4e48，\u518d\u505a\u4ec0\u4e48<\/td>\n\u72b6\u6001\u662f\u4ec0\u4e48，\u754c\u9762\u5c31\u662f\u4ec0\u4e48<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u8fd9\u4e2a\u8f6c\u53d8\u8d2f\u7a7f\u6574\u4e2a\u7cfb\u5217\u3002\u6bcf\u6b21\u5199 Compose，\u90fd\u8981\u95ee\u81ea\u5df1：\u6211\u5728\u63cf\u8ff0\u72b6\u6001，\u8fd8\u662f\u5728\u64cd\u4f5c\u63a7\u4ef6？<\/p>\n

      \n

      \u4e09\u3001Compose \u8fd0\u884c\u6a21\u578b：\u7ec4\u5408\u3001\u91cd\u7ec4\u3001\u72b6\u6001\u8ffd\u8e2a<\/h3>\n

      \u8fd9\u4e00\u8282\u662f\u7b2c 1 \u8bfe\u6700\u503c\u5f97\u6df1\u5165\u7406\u89e3\u7684\u90e8\u5206\u3002API \u53ef\u4ee5\u67e5\u6587\u6863，\u4f46\u8fd0\u884c\u6a21\u578b\u51b3\u5b9a\u4e86\u4f60\u80fd\u4e0d\u80fd\u5199\u51fa\u6b63\u786e\u7684 Compose \u4ee3\u7801\u3002<\/p>\n

      3.1 @Composable \u4e0d\u662f\u666e\u901a\u51fd\u6570<\/h4>\n

      @Composable<\/span>
      \nfun<\/span> Greeting<\/span>(<\/span>name:<\/span> String)<\/span> {<\/span>
      \n Text<\/span>(<\/span>"\u4f60\u597d，<\/span>$<\/span>name<\/span><\/span>"<\/span><\/span>)<\/span>
      \n}<\/span><\/p>\n

      @Composable \u51fd\u6570\u7ecf\u8fc7 Compose \u7f16\u8bd1\u5668\u63d2\u4ef6\u5904\u7406\u540e，\u4f1a\u5e26\u6709\u989d\u5916\u7684\u8fd0\u884c\u65f6\u4fe1\u606f\u3002\u5b83\u4e0d\u80fd\u88ab\u666e\u901a\u51fd\u6570\u968f\u610f\u8c03\u7528，\u901a\u5e38\u53ea\u80fd\u5728\u53e6\u4e00\u4e2a @Composable \u51fd\u6570\u4e2d\u8c03\u7528\u3002<\/p>\n

      \u53ef\u4ee5\u8fd9\u6837\u7406\u89e3：<\/p>\n

      \u666e\u901a\u51fd\u6570：\u6267\u884c\u903b\u8f91，\u8fd4\u56de\u7ed3\u679c\u3002
      \nComposable：\u63cf\u8ff0 UI，\u53c2\u4e0e\u7ec4\u5408\u3002<\/p>\n

      3.2 \u7ec4\u5408：Composable \u6267\u884c\u540e\u5f62\u6210\u7684 UI \u63cf\u8ff0\u6811<\/h4>\n

      \u5f53 Compose \u7b2c\u4e00\u6b21\u6267\u884c @Composable \u51fd\u6570\u65f6，\u4f1a\u751f\u6210\u4e00\u68f5"\u7ec4\u5408\u6811"，\u4e5f\u53eb Composition\u3002<\/p>\n

      Column {<\/span>
      \n Text<\/span>(<\/span>"\u6807\u9898"<\/span><\/span>)<\/span>
      \n Button<\/span>(<\/span>onClick =<\/span> {<\/span> }<\/span>)<\/span> {<\/span>
      \n Text<\/span>(<\/span>"\u6309\u94ae"<\/span><\/span>)<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      \u7c97\u7565\u7406\u89e3\u4e3a：<\/p>\n

      Column
      \n\u251c\u2500\u2500 Text("\u6807\u9898")
      \n\u2514\u2500\u2500 Button
      \n \u2514\u2500\u2500 Text("\u6309\u94ae")<\/p>\n

      \u8fd9\u68f5\u6811\u5c31\u662f Compose \u7ba1\u7406\u754c\u9762\u7684\u4f9d\u636e\u3002<\/p>\n

      3.3 \u91cd\u7ec4：\u72b6\u6001\u53d8\u5316\u540e，\u91cd\u65b0\u6267\u884c\u76f8\u5173 Composable<\/h4>\n

      \u5f53\u67d0\u4e2a\u72b6\u6001\u53d1\u751f\u53d8\u5316，Compose \u4f1a\u627e\u51fa\u54ea\u4e9b @Composable \u8bfb\u53d6\u4e86\u8fd9\u4e2a\u72b6\u6001，\u7136\u540e\u91cd\u65b0\u6267\u884c\u5b83\u4eec\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u53eb\u91cd\u7ec4\u3002<\/p>\n

      \u5173\u952e\u70b9：<\/p>\n

    • \u91cd\u7ec4\u4e0d\u662f\u91cd\u5efa\u6574\u4e2a Activity\u3002<\/li>\n
    • \u91cd\u7ec4\u4e0d\u662f\u91cd\u65b0\u6267\u884c\u6240\u6709 Composable\u3002<\/li>\n
    • Compose \u4f1a\u5c3d\u91cf\u8df3\u8fc7\u6ca1\u6709\u53d8\u5316\u7684\u8282\u70b9\u3002<\/li>\n
    • \u91cd\u7ec4\u662f\u589e\u91cf\u3001\u667a\u80fd\u3001\u53ef\u8df3\u8fc7\u7684\u3002<\/li>\n

      3.4 \u72b6\u6001\u8bfb\u53d6\u8ffd\u8e2a<\/h4>\n

      Compose \u4e4b\u6240\u4ee5\u77e5\u9053"\u8c01\u8be5\u91cd\u7ec4"，\u662f\u56e0\u4e3a\u5b83\u4f1a\u5728 Composable \u6267\u884c\u671f\u95f4\u8bb0\u5f55：<\/p>\n

      \u8c01\u8bfb\u53d6\u4e86\u54ea\u4e2a State\u3002<\/p>\n

      \u5f53 State \u53d8\u5316\u65f6，Compose \u901a\u77e5\u8bfb\u53d6\u8fc7\u5b83\u7684 Composable \u91cd\u65b0\u6267\u884c\u3002<\/p>\n

      \u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u666e\u901a\u53d8\u91cf\u4e0d\u884c：<\/p>\n

      var<\/span> count =<\/span> 0<\/span>
      \nText<\/span>(<\/span>"<\/span>$<\/span>count<\/span><\/span>"<\/span><\/span>)<\/span><\/p>\n

      \u666e\u901a\u53d8\u91cf\u4e0d\u662f State，Compose \u65e0\u6cd5\u8ffd\u8e2a\u8bfb\u53d6，\u4e5f\u65e0\u6cd5\u5728\u53d8\u5316\u65f6\u89e6\u53d1\u91cd\u7ec4\u3002<\/p>\n

      3.5 \u5e42\u7b49\u6027：Composable \u5e94\u8be5\u53ef\u4ee5\u5b89\u5168\u5730\u91cd\u590d\u6267\u884c<\/h4>\n

      Composable \u53ef\u80fd\u56e0\u4e3a\u72b6\u6001\u53d8\u5316\u800c\u591a\u6b21\u6267\u884c\u3002\u56e0\u6b64\u5b83\u5e94\u8be5\u6ee1\u8db3：<\/p>\n

    • \u591a\u6b21\u6267\u884c\u7ed3\u679c\u4e00\u81f4，\u53ea\u8981\u8f93\u5165\u548c\u72b6\u6001\u76f8\u540c\u3002<\/li>\n
    • \u4e0d\u4ea7\u751f\u4e0d\u53ef\u63a7\u526f\u4f5c\u7528\u3002<\/li>\n
    • \u4e0d\u4f9d\u8d56\u6267\u884c\u987a\u5e8f\u3002<\/li>\n
    • \u4e0d\u76f4\u63a5\u4fee\u6539\u5916\u90e8\u53d8\u91cf\u3002<\/li>\n

      \u9519\u8bef\u793a\u4f8b：<\/p>\n

      @Composable<\/span>
      \nfun<\/span> Bad<\/span>(<\/span>)<\/span> {<\/span>
      \n loadDataFromNetwork<\/span>(<\/span>)<\/span> \/\/ \u6bcf\u6b21\u91cd\u7ec4\u90fd\u4f1a\u6267\u884c，\u53ef\u80fd\u91cd\u590d\u8bf7\u6c42<\/span>
      \n Text<\/span>(<\/span>"\u5185\u5bb9"<\/span><\/span>)<\/span>
      \n}<\/span><\/p>\n

      \u6b63\u786e\u505a\u6cd5\u662f\u628a\u526f\u4f5c\u7528\u653e\u5230 LaunchedEffect\u3001DisposableEffect \u7b49 API \u4e2d，\u7b2c 10 \u8bfe\u4f1a\u6df1\u5165\u3002<\/p>\n

      3.6 \u4f4d\u7f6e\u8bb0\u5fc6：remember \u4e3a\u4ec0\u4e48\u80fd\u4fdd\u5b58\u72b6\u6001？<\/h4>\n

      remember \u662f\u6309"\u8c03\u7528\u4f4d\u7f6e"\u6765\u8bb0\u5fc6\u7684\u3002Compose \u5728\u7ec4\u5408\u6811\u4e2d\u4e3a\u6bcf\u4e2a remember \u8bb0\u5f55\u4e00\u4e2a\u4f4d\u7f6e\u3002\u53ea\u8981\u8fd9\u4e2a\u4f4d\u7f6e\u5728\u91cd\u7ec4\u4e2d\u4fdd\u6301\u7a33\u5b9a，remember \u4fdd\u5b58\u7684\u503c\u5c31\u4f1a\u4fdd\u7559\u3002<\/p>\n

      var<\/span> count by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

      \u91cd\u7ec4\u65f6，Compose \u53d1\u73b0\u8fd8\u662f\u540c\u4e00\u4e2a\u4f4d\u7f6e，\u4e8e\u662f\u53d6\u51fa\u4e4b\u524d\u4fdd\u5b58\u7684 MutableState\u3002<\/p>\n

      \u4f46\u5982\u679c remember \u51fa\u73b0\u5728 if \u5206\u652f\u4e2d，\u4f4d\u7f6e\u53ef\u80fd\u53d8\u5316，\u72b6\u6001\u53ef\u80fd\u88ab\u91cd\u7f6e\u3002\u8fd9\u662f\u540e\u9762\u5b66\u4e60\u72b6\u6001\u7ba1\u7406\u65f6\u975e\u5e38\u91cd\u8981\u7684\u7ec6\u8282\u3002<\/p>\n

      \n

      \u56db\u3001\u73af\u5883\u51c6\u5907<\/h3>\n
    • \u5b89\u88c5 Android Studio \u7a33\u5b9a\u7248\u3002<\/li>\n
    • \u65b0\u5efa\u9879\u76ee：New Project > Empty Activity\u3002<\/li>\n
    • \u914d\u7f6e：\n
        \n
      • Name：ComposeFirst<\/li>\n
      • Package：com.example.composefirst<\/li>\n
      • Language：Kotlin<\/li>\n
      • Minimum SDK：API 24 \u6216\u66f4\u9ad8<\/li>\n<\/ul>\n<\/li>\n
      • \u7b49\u5f85 Gradle Sync \u5b8c\u6210\u3002<\/li>\n
      • \u542f\u52a8\u6a21\u62df\u5668\u6216\u8fde\u63a5\u771f\u673a，\u70b9\u51fb Run\u3002<\/li>\n

        Empty Activity \u6a21\u677f\u901a\u5e38\u4f1a\u81ea\u52a8\u52a0\u5165 Compose \u4f9d\u8d56\u3002\u5173\u952e\u4f9d\u8d56：<\/p>\n

        implementation<\/span>(<\/span>platform<\/span>(<\/span>"androidx.compose:compose-bom:…"<\/span><\/span>)<\/span>)<\/span>
        \nimplementation<\/span>(<\/span>"androidx.activity:activity-compose:…"<\/span><\/span>)<\/span>
        \nimplementation<\/span>(<\/span>"androidx.compose.material3:material3"<\/span><\/span>)<\/span>
        \nimplementation<\/span>(<\/span>"androidx.compose.ui:ui-tooling-preview"<\/span><\/span>)<\/span>
        \ndebugImplementation<\/span>(<\/span>"androidx.compose.ui:ui-tooling"<\/span><\/span>)<\/span><\/p>\n

        \u7248\u672c\u4ee5 Android Studio \u6a21\u677f\u751f\u6210\u6216\u5b98\u65b9\u6587\u6863\u4e3a\u51c6\u3002<\/p>\n

        \n

        \u4e94\u3001\u7b2c\u4e00\u4e2a\u5b8c\u6574 Compose \u7a0b\u5e8f<\/h3>\n

        \u6253\u5f00 MainActivity.kt，\u5199\u5165\u4ee5\u4e0b\u5b8c\u6574\u793a\u4f8b：<\/p>\n

        package<\/span> com.<\/span>example.<\/span>composefirst<\/p>\n

        import<\/span> android.<\/span>os.<\/span>Bundle
        \nimport<\/span> androidx.<\/span>activity.<\/span>ComponentActivity
        \nimport<\/span> androidx.<\/span>activity.<\/span>compose.<\/span>setContent
        \nimport<\/span> androidx.<\/span>compose.<\/span>foundation.<\/span>layout.<\/span>*<\/span>
        \nimport<\/span> androidx.<\/span>compose.<\/span>material3.<\/span>*<\/span>
        \nimport<\/span> androidx.<\/span>compose.<\/span>runtime.<\/span>*<\/span>
        \nimport<\/span> androidx.<\/span>compose.<\/span>ui.<\/span>Alignment
        \nimport<\/span> androidx.<\/span>compose.<\/span>ui.<\/span>Modifier
        \nimport<\/span> androidx.<\/span>compose.<\/span>ui.<\/span>tooling.<\/span>preview.<\/span>Preview
        \nimport<\/span> androidx.<\/span>compose.<\/span>ui.<\/span>unit.<\/span>dp<\/p>\n

        class<\/span> MainActivity :<\/span> ComponentActivity<\/span>(<\/span>)<\/span> {<\/span>
        \n override<\/span> fun<\/span> onCreate<\/span>(<\/span>savedInstanceState:<\/span> Bundle?<\/span>)<\/span> {<\/span>
        \n super<\/span>.<\/span>onCreate<\/span>(<\/span>savedInstanceState)<\/span>
        \n setContent {<\/span>
        \n MyApp<\/span>(<\/span>)<\/span>
        \n }<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        @Composable<\/span>
        \nfun<\/span> MyApp<\/span>(<\/span>)<\/span> {<\/span>
        \n MaterialTheme {<\/span>
        \n Surface<\/span>(<\/span>modifier =<\/span> Modifier.<\/span>fillMaxSize<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n Column<\/span>(<\/span>
        \n modifier =<\/span> Modifier.<\/span>padding<\/span>(<\/span>16<\/span>.<\/span>dp)<\/span>,<\/span>
        \n verticalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>24<\/span>.<\/span>dp)<\/span>
        \n )<\/span> {<\/span>
        \n Greeting<\/span>(<\/span>name =<\/span> "Compose \u5b66\u4e60\u8005"<\/span><\/span>)<\/span>
        \n Counter<\/span>(<\/span>)<\/span>
        \n }<\/span>
        \n }<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        @Composable<\/span>
        \nfun<\/span> Greeting<\/span>(<\/span>name:<\/span> String,<\/span> modifier:<\/span> Modifier =<\/span> Modifier)<\/span> {<\/span>
        \n Column<\/span>(<\/span>
        \n modifier =<\/span> modifier,<\/span>
        \n verticalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>8<\/span>.<\/span>dp)<\/span>
        \n )<\/span> {<\/span>
        \n Text<\/span>(<\/span>
        \n text =<\/span> "\u4f60\u597d，<\/span>$<\/span>name<\/span><\/span>！"<\/span><\/span>,<\/span>
        \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>headlineSmall
        \n )<\/span>
        \n Text<\/span>(<\/span>
        \n text =<\/span> "\u6b22\u8fce\u8fdb\u5165 Jetpack Compose \u58f0\u660e\u5f0f UI \u4e16\u754c"<\/span><\/span>,<\/span>
        \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>bodyMedium
        \n )<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        @Composable<\/span>
        \nfun<\/span> Counter<\/span>(<\/span>modifier:<\/span> Modifier =<\/span> Modifier)<\/span> {<\/span>
        \n var<\/span> count by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

        Column<\/span>(<\/span>
        \n modifier =<\/span> modifier,<\/span>
        \n horizontalAlignment =<\/span> Alignment.<\/span>CenterHorizontally,<\/span>
        \n verticalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>12<\/span>.<\/span>dp)<\/span>
        \n )<\/span> {<\/span>
        \n Text<\/span>(<\/span>
        \n text =<\/span> "\u70b9\u51fb\u6b21\u6570：<\/span>$<\/span>count<\/span><\/span>"<\/span><\/span>,<\/span>
        \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>titleLarge
        \n )<\/span><\/p>\n

        Row<\/span>(<\/span>horizontalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>12<\/span>.<\/span>dp)<\/span>)<\/span> {<\/span>
        \n Button<\/span>(<\/span>
        \n onClick =<\/span> {<\/span> count—<\/span> }<\/span>,<\/span>
        \n enabled =<\/span> count ><\/span> 0<\/span>
        \n )<\/span> {<\/span>
        \n Text<\/span>(<\/span>"-1"<\/span><\/span>)<\/span>
        \n }<\/span><\/p>\n

        Button<\/span>(<\/span>onClick =<\/span> {<\/span> count++<\/span> }<\/span>)<\/span> {<\/span>
        \n Text<\/span>(<\/span>"+1"<\/span><\/span>)<\/span>
        \n }<\/span><\/p>\n

        OutlinedButton<\/span>(<\/span>onClick =<\/span> {<\/span> count =<\/span> 0<\/span> }<\/span>)<\/span> {<\/span>
        \n Text<\/span>(<\/span>"\u91cd\u7f6e"<\/span><\/span>)<\/span>
        \n }<\/span>
        \n }<\/span><\/p>\n

        if<\/span> (<\/span>count >=<\/span> 5<\/span>)<\/span> {<\/span>
        \n Text<\/span>(<\/span>
        \n text =<\/span> "\u4e0d\u9519，\u5df2\u7ecf\u70b9\u51fb <\/span>$<\/span>count<\/span><\/span> \u6b21！"<\/span><\/span>,<\/span>
        \n color =<\/span> MaterialTheme.<\/span>colorScheme.<\/span>primary
        \n )<\/span>
        \n }<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

        @Preview<\/span>(<\/span>showBackground =<\/span> true<\/span>,<\/span> name =<\/span> "\u9996\u9875\u9884\u89c8"<\/span><\/span>)<\/span>
        \n@Composable<\/span>
        \nfun<\/span> MyAppPreview<\/span>(<\/span>)<\/span> {<\/span>
        \n MyApp<\/span>(<\/span>)<\/span>
        \n}<\/span><\/p>\n

        \u6ce8\u610f：by remember \u9700\u8981\u5bfc\u5165 getValue \u548c setValue，\u4f7f\u7528 import androidx.compose.runtime.* \u5373\u53ef\u3002<\/p>\n

        \n

        \u516d\u3001\u4ee3\u7801\u9010\u5c42\u6df1\u5165\u62c6\u89e3<\/h3>\n

        6.1 setContent：\u8fdb\u5165 Compose \u4e16\u754c\u7684\u5165\u53e3<\/h4>\n

        setContent {<\/span>
        \n MyApp<\/span>(<\/span>)<\/span>
        \n}<\/span><\/p>\n

        setContent \u662f Activity \u4e2d\u8bbe\u7f6e Compose \u754c\u9762\u7684\u5165\u53e3\u3002\u5b83\u5185\u90e8\u4f1a\u521b\u5efa Compose \u7684\u8fd0\u884c\u73af\u5883，\u628a MyApp() \u653e\u5165\u7ec4\u5408\u6811\u4e2d\u3002<\/p>\n

        \u7c7b\u6bd4\u4f20\u7edf View：<\/p>\n

        setContentView<\/span>(<\/span>R.<\/span>layout.<\/span>activity_main)<\/span><\/p>\n

        \u533a\u522b：setContent \u63a5\u6536\u7684\u662f\u4e00\u6bb5\u58f0\u660e\u5f0f UI，\u800c\u4e0d\u662f\u4e00\u4e2a XML \u5e03\u5c40\u3002<\/p>\n

        6.2 MaterialTheme \u4e0e Surface<\/h4>\n

        MaterialTheme {<\/span>
        \n Surface<\/span>(<\/span>modifier =<\/span> Modifier.<\/span>fillMaxSize<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n \/\/ \u5185\u5bb9<\/span>
        \n }<\/span>
        \n}<\/span><\/p>\n

          \n
        • MaterialTheme：\u63d0\u4f9b Material 3 \u7684\u989c\u8272\u3001\u5b57\u4f53\u3001\u5f62\u72b6\u7b49\u8bbe\u8ba1\u7cfb\u7edf\u3002<\/li>\n
        • Surface：\u63d0\u4f9b\u4e00\u4e2a\u6709\u80cc\u666f\u3001\u53ef\u627f\u8f7d\u5185\u5bb9\u7684\u8868\u9762，\u901a\u5e38\u7528\u4e8e\u9875\u9762\u6839\u5bb9\u5668\u3002<\/li>\n<\/ul>\n

          6.3 Column：\u5782\u76f4\u5e03\u5c40<\/h4>\n

          Column<\/span>(<\/span>
          \n modifier =<\/span> Modifier.<\/span>padding<\/span>(<\/span>16<\/span>.<\/span>dp)<\/span>,<\/span>
          \n verticalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>24<\/span>.<\/span>dp)<\/span>
          \n)<\/span> {<\/span>
          \n Greeting<\/span>(<\/span>..<\/span>.<\/span>)<\/span>
          \n Counter<\/span>(<\/span>)<\/span>
          \n}<\/span><\/p>\n

            \n
          • Column \u628a\u5b50\u5143\u7d20\u4ece\u4e0a\u5230\u4e0b\u6392\u5217\u3002<\/li>\n
          • verticalArrangement \u63a7\u5236\u4e3b\u8f74，\u4e5f\u5c31\u662f\u5782\u76f4\u65b9\u5411\u4e0a\u7684\u6392\u5217\u3002<\/li>\n
          • Arrangement.spacedBy(24.dp) \u8868\u793a\u5b50\u5143\u7d20\u4e4b\u95f4\u95f4\u9694 24dp\u3002<\/li>\n
          • modifier = Modifier.padding(16.dp) \u7ed9\u6574\u4e2a Column \u589e\u52a0\u5185\u8fb9\u8ddd\u3002<\/li>\n<\/ul>\n

            6.4 Greeting：Composable \u53c2\u6570\u4e0e Modifier \u7ea6\u5b9a<\/h4>\n

            Compose \u7ec4\u4ef6\u5e38\u89c1\u7684\u53c2\u6570\u7ea6\u5b9a：<\/p>\n

          • \u5fc5\u586b\u6570\u636e\u53c2\u6570\u653e\u524d\u9762\u3002<\/li>\n
          • modifier: Modifier = Modifier \u653e\u540e\u9762\u3002<\/li>\n
          • \u53ef\u9009\u53c2\u6570\u518d\u5f80\u540e\u3002<\/li>\n

            \u8fd9\u6837\u505a\u7684\u597d\u5904：\u8c03\u7528\u65b9\u53ef\u4ee5\u7edf\u4e00\u4f20\u5165 Modifier \u6765\u63a7\u5236\u5c3a\u5bf8\u3001\u95f4\u8ddd\u3001\u70b9\u51fb\u7b49，\u63d0\u9ad8\u7ec4\u4ef6\u590d\u7528\u6027\u3002<\/p>\n

            6.5 Counter：\u72b6\u6001\u3001\u4e8b\u4ef6\u4e0e\u91cd\u7ec4<\/h4>\n

            var<\/span> count by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

            \u8fd9\u662f\u7b2c 1 \u8bfe\u7684\u6838\u5fc3：<\/p>\n

              \n
            • mutableStateOf(0)：\u521b\u5efa\u4e00\u4e2a\u53ef\u89c2\u5bdf\u72b6\u6001，\u521d\u59cb\u503c\u4e3a 0\u3002<\/li>\n
            • remember：\u5728\u91cd\u7ec4\u4e4b\u95f4\u4fdd\u5b58\u8fd9\u4e2a\u72b6\u6001\u3002<\/li>\n
            • by：Kotlin \u59d4\u6258，\u8ba9 count \u770b\u8d77\u6765\u50cf\u666e\u901a\u53d8\u91cf\u3002<\/li>\n<\/ul>\n

              \u5f53 count++ \u6267\u884c\u65f6：<\/p>\n

            • MutableState \u7684\u503c\u53d1\u751f\u53d8\u5316\u3002<\/li>\n
            • Compose \u53d1\u73b0 Text("\u70b9\u51fb\u6b21\u6570：$count") \u8bfb\u53d6\u4e86 count\u3002<\/li>\n
            • \u76f8\u5173 Composable \u88ab\u91cd\u65b0\u6267\u884c\u3002<\/li>\n
            • Text \u663e\u793a\u65b0\u7684\u6b21\u6570\u3002<\/li>\n

              6.6 Row \u4e0e\u6309\u94ae<\/h4>\n
                \n
              • Row \u628a\u5b50\u5143\u7d20\u4ece\u5de6\u5230\u53f3\u6392\u5217\u3002<\/li>\n
              • horizontalArrangement \u63a7\u5236\u6c34\u5e73\u65b9\u5411\u6392\u5217\u3002<\/li>\n
              • enabled = count > 0 \u8ba9 count == 0 \u65f6"-1"\u6309\u94ae\u7981\u7528\u3002<\/li>\n
              • Button\u3001OutlinedButton \u662f Material 3 \u63d0\u4f9b\u7684\u6309\u94ae\u7ec4\u4ef6\u3002<\/li>\n<\/ul>\n

                6.7 \u6761\u4ef6\u6e32\u67d3<\/h4>\n

                if<\/span> (<\/span>count >=<\/span> 5<\/span>)<\/span> {<\/span>
                \n Text<\/span>(<\/span>"\u4e0d\u9519，\u5df2\u7ecf\u70b9\u51fb <\/span>$<\/span>count<\/span><\/span> \u6b21！"<\/span><\/span>)<\/span>
                \n}<\/span><\/p>\n

                Compose \u4e2d\u53ef\u4ee5\u76f4\u63a5\u7528 if \u63a7\u5236 UI \u662f\u5426\u51fa\u73b0\u3002\u5b83\u548c\u4f20\u7edf View \u7684 visibility \u4e0d\u540c：<\/p>\n

                  \n
                • if \u4e3a false \u65f6，\u8fd9\u6bb5 UI \u4e0d\u8fdb\u5165\u7ec4\u5408\u3002<\/li>\n
                • if \u4e3a true \u65f6，\u8fd9\u6bb5 UI \u8fdb\u5165\u7ec4\u5408\u3002<\/li>\n
                • \u4e0d\u662f\u9690\u85cf，\u800c\u662f"\u5b58\u5728\u6216\u4e0d\u5b58\u5728"\u3002<\/li>\n<\/ul>\n

                  6.8 @Preview<\/h4>\n

                  @Preview \u8ba9 Android Studio \u76f4\u63a5\u9884\u89c8 UI，\u4e0d\u5fc5\u8fd0\u884c\u6a21\u62df\u5668\u3002\u5e38\u7528\u53c2\u6570：<\/p>\n

                    \n
                  • showBackground = true：\u663e\u793a\u80cc\u666f\u3002<\/li>\n
                  • name = "\u9996\u9875\u9884\u89c8"：\u9884\u89c8\u540d\u79f0\u3002<\/li>\n
                  • widthDp\u3001heightDp：\u6307\u5b9a\u9884\u89c8\u5c3a\u5bf8\u3002<\/li>\n
                  • group：\u9884\u89c8\u5206\u7ec4\u3002<\/li>\n<\/ul>\n

                    Preview \u4e2d\u4e0d\u8981\u5199\u7f51\u7edc\u8bf7\u6c42\u3001\u6570\u636e\u5e93\u7b49\u590d\u6742\u903b\u8f91\u3002<\/p>\n

                    \n

                    \u4e03\u3001\u968f\u5802\u7ec3<\/h3>\n
                  • \u628a\u95ee\u5019\u8bed\u6539\u6210"\u4f60\u597d，XXX！\u6211\u662f Compose \u65b0\u624b"\u3002<\/li>\n
                  • \u7ed9\u8ba1\u6570\u5668\u589e\u52a0"-1"\u6309\u94ae，\u4e14 count == 0 \u65f6\u7981\u7528\u3002<\/li>\n
                  • \u589e\u52a0"\u91cd\u7f6e"\u6309\u94ae，\u628a\u6b21\u6570\u5f52\u96f6\u3002<\/li>\n
                  • \u5f53 count >= 5 \u65f6，\u663e\u793a\u4e00\u53e5\u9f13\u52b1\u6587\u5b57\u3002<\/li>\n
                  • \u65b0\u5efa\u4e00\u4e2a @Preview，\u5355\u72ec\u9884\u89c8 Counter()\u3002<\/li>\n
                    \n

                    \u516b\u300115 \u9053\u4e60\u9898（\u542b\u53c2\u8003\u7b54\u6848\u4e0e\u89e3\u8bfb）<\/h3>\n

                    \u4e60\u9898 1：Compose \u58f0\u660e\u5f0f UI \u7684\u6838\u5fc3\u516c\u5f0f\u662f\u4ec0\u4e48？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848： UI = f(state)<\/p>\n

                    \u89e3\u8bfb： \u754c\u9762\u662f\u72b6\u6001\u7684\u51fd\u6570\u3002\u72b6\u6001\u662f\u552f\u4e00\u6570\u636e\u6e90，UI \u662f\u72b6\u6001\u5728\u5f53\u524d\u65f6\u523b\u7684\u6295\u5f71\u3002\u72b6\u6001\u53d8\u5316\u540e，Compose \u91cd\u65b0\u6267\u884c\u8bfb\u53d6\u4e86\u8be5\u72b6\u6001\u7684 Composable，\u4ece\u800c\u66f4\u65b0\u754c\u9762\u3002\u58f0\u660e\u5f0f UI \u7684\u91cd\u70b9\u4e0d\u662f"\u600e\u4e48\u6539\u63a7\u4ef6"，\u800c\u662f"\u72b6\u6001\u662f\u4ec0\u4e48，\u754c\u9762\u5c31\u5e94\u8be5\u662f\u4ec0\u4e48"\u3002\u8fd9\u4e2a\u516c\u5f0f\u770b\u4f3c\u7b80\u5355，\u4f46\u5b83\u662f\u7406\u89e3\u540e\u9762\u6240\u6709 Compose \u884c\u4e3a\u7684\u603b\u7eb2\u3002<\/p>\n

                    \n

                    \u4e60\u9898 2：\u5728 Compose \u4e2d，\u63cf\u8ff0 UI \u7684\u51fd\u6570\u5fc5\u987b\u52a0\u4ec0\u4e48\u6ce8\u89e3？\u51fd\u6570\u547d\u540d\u6709\u4ec0\u4e48\u5efa\u8bae？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848： \u5fc5\u987b\u52a0 @Composable；\u51fd\u6570\u540d\u5efa\u8bae\u9996\u5b57\u6bcd\u5927\u5199\u3002<\/p>\n

                    \u89e3\u8bfb： @Composable \u4e0d\u662f\u666e\u901a\u6ce8\u89e3，\u5b83\u4f1a\u8ba9 Compose \u7f16\u8bd1\u5668\u63d2\u4ef6\u53c2\u4e0e\u5904\u7406，\u4f7f\u51fd\u6570\u80fd\u53c2\u4e0e\u7ec4\u5408\u3001\u91cd\u7ec4\u548c\u72b6\u6001\u8ffd\u8e2a\u3002\u547d\u540d\u9996\u5b57\u6bcd\u5927\u5199\u662f\u4e3a\u4e86\u548c\u666e\u901a Kotlin \u51fd\u6570\u533a\u5206，\u4f8b\u5982 Greeting()\u3001Counter()\u3001LikeButton()\u3002\u8fd9\u4e5f\u662f Compose \u5b98\u65b9\u4ee3\u7801\u89c4\u8303\u3002\u5982\u679c\u5199\u6210\u5c0f\u5199，\u867d\u7136\u80fd\u7f16\u8bd1，\u4f46\u53ef\u8bfb\u6027\u4f1a\u4e0b\u964d，\u56e2\u961f\u534f\u4f5c\u4e2d\u5bb9\u6613\u6df7\u6dc6\u3002<\/p>\n

                    \n

                    \u4e60\u9898 3：Activity \u4e2d\u8fdb\u5165 Compose \u7684\u5165\u53e3\u51fd\u6570\u662f\u4ec0\u4e48？\u5199\u51fa\u6700\u5c0f\u8c03\u7528\u5f62\u5f0f\u3002<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    setContent {<\/span>
                    \n MyApp<\/span>(<\/span>)<\/span>
                    \n}<\/span><\/p>\n

                    \u89e3\u8bfb： setContent \u662f Activity \u8fdb\u5165 Compose \u4e16\u754c\u7684\u5165\u53e3\u3002\u5b83\u66ff\u4ee3\u4e86\u4f20\u7edf View \u4f53\u7cfb\u4e2d\u7684 setContentView\u3002\u5185\u90e8\u4f1a\u521b\u5efa Compose \u8fd0\u884c\u73af\u5883，\u628a\u4f60\u7684 Composable \u653e\u5165\u7ec4\u5408\u6811\u4e2d\u3002\u6ca1\u6709 setContent，Activity \u5c31\u4e0d\u4f1a\u663e\u793a Compose \u754c\u9762\u3002\u5b83\u672c\u8d28\u4e0a\u662f ComponentActivity \u7684\u6269\u5c55\u51fd\u6570，\u6240\u4ee5\u5fc5\u987b\u7ee7\u627f ComponentActivity \u6216\u5176\u5b50\u7c7b\u3002<\/p>\n

                    \n

                    \u4e60\u9898 4：@Preview \u7684\u4f5c\u7528\u662f\u4ec0\u4e48？\u4e3a\u4ec0\u4e48\u9884\u89c8\u51fd\u6570\u91cc\u4e0d\u5efa\u8bae\u5199\u590d\u6742\u4e1a\u52a1\u903b\u8f91？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848： @Preview \u7528\u4e8e\u5728 Android Studio \u4e2d\u76f4\u63a5\u9884\u89c8 Composable，\u4e0d\u5fc5\u8fd0\u884c App\u3002\u9884\u89c8\u51fd\u6570\u5e94\u53ea\u8d1f\u8d23\u5c55\u793a UI，\u4e0d\u5199\u590d\u6742\u4e1a\u52a1\u903b\u8f91\u3002<\/p>\n

                    \u89e3\u8bfb： Preview \u662f\u5f00\u53d1\u671f\u5de5\u5177，\u4e0d\u662f\u771f\u5b9e\u8fd0\u884c\u73af\u5883\u3002\u5b83\u9002\u5408\u5feb\u901f\u67e5\u770b\u5e03\u5c40\u3001\u4e3b\u9898\u3001\u95f4\u8ddd\u3001\u6587\u5b57\u6548\u679c\u3002\u5982\u679c\u5199\u7f51\u7edc\u8bf7\u6c42\u3001\u6570\u636e\u5e93\u3001\u590d\u6742\u526f\u4f5c\u7528，\u53ef\u80fd\u5bfc\u81f4\u9884\u89c8\u5931\u8d25\u3001\u5361\u987f\u6216\u7ed3\u679c\u4e0d\u53ef\u63a7\u3002\u9884\u89c8\u51fd\u6570\u6700\u597d\u4fdd\u6301\u7eaf\u7cb9，\u53ea\u4f20\u5165\u5047\u6570\u636e\u3002\u53e6\u5916，@Preview \u51fd\u6570\u672c\u8eab\u4e5f\u662f @Composable，\u4f46\u5b83\u4e0d\u4f1a\u88ab\u771f\u5b9e App \u8c03\u7528，\u6240\u4ee5\u9002\u5408\u653e\u6a21\u62df\u6570\u636e\u3002<\/p>\n

                    \n

                    \u4e60\u9898 5：\u5199\u51fa\u4e00\u884c\u4ee3\u7801：\u58f0\u660e\u4e00\u4e2a\u521d\u59cb\u503c\u4e3a 0 \u7684\u53ef\u89c2\u5bdf\u72b6\u6001，\u5e76\u5728\u91cd\u7ec4\u4e4b\u95f4\u4fdd\u5b58\u3002<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    var<\/span> count by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

                    \u89e3\u8bfb： mutableStateOf(0) \u521b\u5efa\u53ef\u89c2\u5bdf\u72b6\u6001；remember \u8ba9\u72b6\u6001\u5728\u91cd\u7ec4\u4e4b\u95f4\u4e0d\u88ab\u91cd\u7f6e；by \u662f Kotlin \u59d4\u6258\u8bed\u6cd5，\u7b80\u5316\u8bfb\u5199\u3002\u4e09\u8005\u914d\u5408，\u624d\u80fd\u8ba9 count \u5728\u754c\u9762\u4e2d\u65e2"\u80fd\u88ab\u89c2\u5bdf"，\u53c8"\u80fd\u8de8\u91cd\u7ec4\u4fdd\u5b58"\u3002\u5982\u679c\u53ea\u5199 mutableStateOf \u4e0d\u5199 remember，\u91cd\u7ec4\u540e\u72b6\u6001\u53ef\u80fd\u4e22\u5931\u3002\u5982\u679c\u53ea\u5199 remember \u4e0d\u5199 mutableStateOf，\u53d8\u5316\u53c8\u65e0\u6cd5\u88ab Compose \u89c2\u5bdf\u3002<\/p>\n

                    \n

                    \u4e60\u9898 6：\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u5199 var count = 0，\u7136\u540e Button(onClick = { count++ })？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848： \u666e\u901a\u5c40\u90e8\u53d8\u91cf\u4e0d\u662f Compose \u72b6\u6001，\u53d8\u5316\u540e\u4e0d\u4f1a\u89e6\u53d1\u91cd\u7ec4，\u754c\u9762\u4e0d\u4f1a\u66f4\u65b0\u3002<\/p>\n

                    \u89e3\u8bfb： Compose \u53ea\u89c2\u5bdf State \u5bf9\u8c61\u3002mutableStateOf \u8fd4\u56de\u7684\u662f MutableState，\u5b83\u5c5e\u4e8e Compose \u7684\u5feb\u7167\u72b6\u6001\u7cfb\u7edf\u3002\u666e\u901a\u53d8\u91cf\u6ca1\u6709\u8ba2\u9605\u673a\u5236，Compose \u4e0d\u77e5\u9053\u5b83\u53d8\u4e86，\u4e5f\u4e0d\u4f1a\u91cd\u65b0\u6267\u884c UI\u3002\u6240\u4ee5\u754c\u9762\u770b\u8d77\u6765"\u70b9\u4e86\u6ca1\u53cd\u5e94"\u3002\u8fd9\u4e5f\u662f\u521d\u5b66\u8005\u6700\u5e38\u89c1\u7684\u9519\u8bef\u4e4b\u4e00：\u4ee3\u7801\u6ca1\u9519，\u4f46\u754c\u9762\u4e0d\u5237\u65b0\u3002<\/p>\n

                    \n

                    \u4e60\u9898 7：\u4ec0\u4e48\u662f\u91cd\u7ec4？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848： \u5f53 Compose \u8bfb\u53d6\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6，Compose \u91cd\u65b0\u6267\u884c\u76f8\u5173 @Composable \u51fd\u6570，\u5237\u65b0\u754c\u9762，\u8fd9\u4e2a\u8fc7\u7a0b\u53eb\u91cd\u7ec4\u3002<\/p>\n

                    \u89e3\u8bfb： \u91cd\u7ec4\u662f Compose \u7684\u6838\u5fc3\u673a\u5236\u3002\u5b83\u4e0d\u662f\u91cd\u5efa\u6574\u4e2a Activity，\u4e5f\u4e0d\u662f\u91cd\u65b0\u6267\u884c\u6240\u6709 Composable\u3002Compose \u4f1a\u8bb0\u5f55\u54ea\u4e9b Composable \u8bfb\u53d6\u4e86\u54ea\u4e9b\u72b6\u6001，\u53ea\u91cd\u65b0\u6267\u884c\u53d7\u5f71\u54cd\u7684\u90e8\u5206，\u5e76\u5c3d\u91cf\u8df3\u8fc7\u6ca1\u6709\u53d8\u5316\u7684\u8282\u70b9\u3002\u56e0\u6b64\u91cd\u7ec4\u901a\u5e38\u662f\u589e\u91cf\u3001\u667a\u80fd\u3001\u53ef\u4f18\u5316\u7684\u3002\u7406\u89e3\u8fd9\u4e00\u70b9，\u540e\u9762\u5b66\u4e60\u6027\u80fd\u4f18\u5316\u65f6\u5c31\u4f1a\u5f88\u81ea\u7136\u3002<\/p>\n

                    \n

                    \u4e60\u9898 8：Column \u4e2d\u8ba9\u5b50\u5143\u7d20\u6c34\u5e73\u5c45\u4e2d，\u5e94\u8bbe\u7f6e\u54ea\u4e2a\u53c2\u6570？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    Column<\/span>(<\/span>
                    \n horizontalAlignment =<\/span> Alignment.<\/span>CenterHorizontally
                    \n)<\/span> {<\/span>
                    \n \/\/ \u5b50\u5143\u7d20<\/span>
                    \n}<\/span><\/p>\n

                    \u89e3\u8bfb： Column \u7684\u4e3b\u8f74\u662f\u5782\u76f4\u65b9\u5411，\u4ea4\u53c9\u8f74\u662f\u6c34\u5e73\u65b9\u5411\u3002horizontalAlignment \u63a7\u5236\u5b50\u5143\u7d20\u5728\u6c34\u5e73\u65b9\u5411\u7684\u5bf9\u9f50\u65b9\u5f0f\u3002\u7c7b\u4f3c\u5730，Row \u7684\u4e3b\u8f74\u662f\u6c34\u5e73\u65b9\u5411，\u4ea4\u53c9\u8f74\u662f\u5782\u76f4\u65b9\u5411，\u6240\u4ee5 Row \u7528 verticalAlignment \u63a7\u5236\u5782\u76f4\u5bf9\u9f50\u3002\u7406\u89e3"\u4e3b\u8f74 \/ \u4ea4\u53c9\u8f74"\u662f\u638c\u63e1 Compose \u5e03\u5c40\u7684\u5173\u952e\u3002<\/p>\n

                    \n

                    \u4e60\u9898 9：Row \u4e2d\u7ed9\u5b50\u5143\u7d20\u4e4b\u95f4\u7edf\u4e00\u52a0 12dp \u95f4\u8ddd，\u5e94\u600e\u4e48\u5199？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    Row<\/span>(<\/span>
                    \n horizontalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>12<\/span>.<\/span>dp)<\/span>
                    \n)<\/span> {<\/span>
                    \n \/\/ \u5b50\u5143\u7d20<\/span>
                    \n}<\/span><\/p>\n

                    \u89e3\u8bfb： Arrangement \u63a7\u5236\u4e3b\u8f74\u6392\u5217\u65b9\u5f0f\u3002spacedBy(12.dp) \u8868\u793a\u5b50\u5143\u7d20\u4e4b\u95f4\u7edf\u4e00\u95f4\u9694 12dp\u3002\u5b83\u6bd4\u624b\u52a8\u63d2\u5165 Spacer \u66f4\u7b80\u6d01，\u4e5f\u66f4\u9002\u5408\u7edf\u4e00\u95f4\u8ddd\u3002\u6ce8\u610f：spacedBy \u53ea\u5f71\u54cd\u5b50\u5143\u7d20\u4e4b\u95f4，\u4e0d\u5f71\u54cd\u4e24\u7aef\u3002\u5982\u679c\u9700\u8981\u5728\u4e24\u7aef\u4e5f\u7559\u767d，\u5e94\u914d\u5408 padding \u4f7f\u7528\u3002<\/p>\n

                    \n

                    \u4e60\u9898 10：Modifier.padding(16.dp) \u7684\u4f5c\u7528\u662f\u4ec0\u4e48？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848： \u7ed9\u5f53\u524d\u7ec4\u4ef6\u589e\u52a0 16dp \u5185\u8fb9\u8ddd\u3002<\/p>\n

                    \u89e3\u8bfb： Modifier \u662f Compose \u7684\u94fe\u5f0f\u914d\u7f6e\u5de5\u5177，\u53ef\u8bbe\u7f6e\u5c3a\u5bf8\u3001\u80cc\u666f\u3001\u8fb9\u6846\u3001\u70b9\u51fb\u3001\u5185\u8fb9\u8ddd\u7b49\u3002padding \u5f71\u54cd\u7ec4\u4ef6\u5185\u5bb9\u4e0e\u8fb9\u754c\u4e4b\u95f4\u7684\u8ddd\u79bb\u3002\u9700\u8981\u7279\u522b\u6ce8\u610f Modifier \u987a\u5e8f：padding \u540e background \u548c background \u540e padding \u6548\u679c\u4e0d\u540c\u3002\u987a\u5e8f\u4e0d\u540c，\u4fee\u9970\u8303\u56f4\u4e0d\u540c\u3002\u8fd9\u662f\u7b2c 3 \u8bfe\u4f1a\u6df1\u5165\u7684\u5185\u5bb9，\u4f46\u7b2c 1 \u8bfe\u5c31\u8981\u6709"Modifier \u987a\u5e8f\u6709\u8bed\u4e49"\u7684\u610f\u8bc6\u3002<\/p>\n

                    \n

                    \u4e60\u9898 11：\u53ea\u5728 count >= 5 \u65f6\u663e\u793a\u4e00\u53e5\u9f13\u52b1\u6587\u5b57，\u5199\u51fa\u4ee3\u7801\u7247\u6bb5\u3002<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    if<\/span> (<\/span>count >=<\/span> 5<\/span>)<\/span> {<\/span>
                    \n Text<\/span>(<\/span>"\u4e0d\u9519，\u5df2\u7ecf\u70b9\u51fb <\/span>$<\/span>count<\/span><\/span> \u6b21！"<\/span><\/span>)<\/span>
                    \n}<\/span><\/p>\n

                    \u89e3\u8bfb： Compose \u4e2d\u53ef\u4ee5\u76f4\u63a5\u7528 if \u51b3\u5b9a\u662f\u5426\u63d2\u5165 UI\u3002\u5b83\u548c\u4f20\u7edf View \u7684 visibility \u4e0d\u540c：if \u4e3a false \u65f6，\u8fd9\u6bb5 UI \u4e0d\u8fdb\u5165\u7ec4\u5408；\u4e3a true \u65f6，\u624d\u8fdb\u5165\u7ec4\u5408\u3002\u8fd9\u662f\u58f0\u660e\u5f0f UI \u975e\u5e38\u81ea\u7136\u7684\u6761\u4ef6\u6e32\u67d3\u65b9\u5f0f\u3002\u80cc\u540e\u7684\u539f\u7406\u662f：Composable \u5c31\u662f\u51fd\u6570，\u51fd\u6570\u91cc\u80fd\u7528 if\u3001when\u3001for \u7b49 Kotlin \u63a7\u5236\u6d41，UI \u4f1a\u968f\u63a7\u5236\u6d41\u52a8\u6001\u751f\u6210\u3002<\/p>\n

                    \n

                    \u4e60\u9898 12：remember \u548c mutableStateOf \u5404\u81ea\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848： mutableStateOf \u521b\u5efa\u53ef\u89c2\u5bdf\u72b6\u6001；remember \u8ba9\u72b6\u6001\u5728\u91cd\u7ec4\u4e4b\u95f4\u4e0d\u88ab\u91cd\u7f6e\u3002<\/p>\n

                    \u89e3\u8bfb： \u4e24\u8005\u804c\u8d23\u4e0d\u540c，\u901a\u5e38\u914d\u5408\u4f7f\u7528\u3002mutableStateOf \u89e3\u51b3"\u53d8\u5316\u80fd\u88ab Compose \u89c2\u5bdf\u5230"\u7684\u95ee\u9898；remember \u89e3\u51b3"\u91cd\u7ec4\u540e\u72b6\u6001\u8fd8\u5728\u4e0d\u5728"\u7684\u95ee\u9898\u3002\u53ea\u5199 mutableStateOf \u4e0d\u5199 remember，\u72b6\u6001\u53ef\u80fd\u5728\u91cd\u7ec4\u540e\u4e22\u5931；\u53ea\u5199 remember \u4e0d\u5199\u72b6\u6001\u7c7b\u578b，\u53d8\u5316\u53c8\u65e0\u6cd5\u88ab Compose \u89c2\u5bdf\u3002\u82e5\u8981\u5728\u5c4f\u5e55\u65cb\u8f6c\u3001\u914d\u7f6e\u53d8\u66f4\u540e\u4ecd\u4fdd\u5b58，\u8fd8\u8981\u8fdb\u4e00\u6b65\u4f7f\u7528 rememberSaveable\u3002<\/p>\n

                    \n

                    \u4e60\u9898 13：\u6309\u94ae\u5728 count == 0 \u65f6\u7981\u7528，\u600e\u4e48\u5199？<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    Button<\/span>(<\/span>
                    \n onClick =<\/span> {<\/span> count—<\/span> }<\/span>,<\/span>
                    \n enabled =<\/span> count ><\/span> 0<\/span>
                    \n)<\/span> {<\/span>
                    \n Text<\/span>(<\/span>"-1"<\/span><\/span>)<\/span>
                    \n}<\/span><\/p>\n

                    \u89e3\u8bfb： enabled = false \u65f6\u6309\u94ae\u4e0d\u53ef\u70b9\u51fb，Material \u7ec4\u4ef6\u901a\u5e38\u8fd8\u4f1a\u81ea\u52a8\u663e\u793a\u7981\u7528\u6837\u5f0f\u3002\u8fd9\u4f53\u73b0\u4e86\u58f0\u660e\u5f0f UI \u7684\u601d\u60f3：\u4f60\u4e0d\u53bb\u624b\u52a8\u8bbe\u7f6e\u6309\u94ae\u989c\u8272\u548c\u70b9\u51fb\u72b6\u6001，\u800c\u662f\u58f0\u660e"\u5f53 count > 0 \u65f6\u6309\u94ae\u53ef\u7528"，\u6846\u67b6\u6839\u636e\u72b6\u6001\u51b3\u5b9a\u5916\u89c2\u548c\u884c\u4e3a\u3002\u8fd9\u79cd"\u58f0\u660e\u6761\u4ef6，\u800c\u975e\u64cd\u4f5c\u7ed3\u679c"\u7684\u601d\u7ef4\u65b9\u5f0f，\u662f Compose \u5f00\u53d1\u7684\u6838\u5fc3\u4e60\u60ef\u3002<\/p>\n

                    \n

                    \u4e60\u9898 14：\u72b6\u6001\u63d0\u5347：\u628a Counter \u5185\u90e8\u7684 count \u63d0\u5347\u5230\u7236\u7ec4\u4ef6，\u5199\u51fa\u7236\u4e0e\u5b50\u7684\u5173\u952e\u7b7e\u540d\u3002<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    @Composable<\/span>
                    \nfun<\/span> CounterHost<\/span>(<\/span>)<\/span> {<\/span>
                    \n var<\/span> count by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

                    Counter<\/span>(<\/span>
                    \n count =<\/span> count,<\/span>
                    \n onCountChange =<\/span> {<\/span> count =<\/span> it }<\/span>
                    \n )<\/span>
                    \n}<\/span><\/p>\n

                    @Composable<\/span>
                    \nfun<\/span> Counter<\/span>(<\/span>
                    \n count:<\/span> Int,<\/span>
                    \n onCountChange:<\/span> (<\/span>Int)<\/span> -><\/span> Unit
                    \n)<\/span> {<\/span>
                    \n Button<\/span>(<\/span>onClick =<\/span> {<\/span> onCountChange<\/span>(<\/span>count +<\/span> 1<\/span>)<\/span> }<\/span>)<\/span> {<\/span>
                    \n Text<\/span>(<\/span>"+1：<\/span>$<\/span>count<\/span><\/span>"<\/span><\/span>)<\/span>
                    \n }<\/span>
                    \n}<\/span><\/p>\n

                    \u89e3\u8bfb： \u72b6\u6001\u7531\u7236\u7ec4\u4ef6\u6301\u6709，\u5b50\u7ec4\u4ef6\u53ea\u63a5\u6536\u6570\u636e\u548c\u4e8b\u4ef6\u56de\u8c03，\u5f62\u6210\u5355\u5411\u6570\u636e\u6d41：<\/p>\n

                    \u72b6\u6001\u5411\u4e0b\u4f20\u9012，\u4e8b\u4ef6\u5411\u4e0a\u56de\u8c03\u3002<\/p>\n

                    \u8fd9\u6837\u505a\u7684\u597d\u5904：Counter \u53d8\u6210\u65e0\u72b6\u6001\u7ec4\u4ef6，\u66f4\u5bb9\u6613\u590d\u7528\u3001\u6d4b\u8bd5\u548c\u9884\u89c8；\u7236\u7ec4\u4ef6\u638c\u63e1\u72b6\u6001，\u66f4\u5bb9\u6613\u534f\u8c03\u591a\u4e2a\u5b50\u7ec4\u4ef6\u3002\u72b6\u6001\u63d0\u5347\u662f Compose \u67b6\u6784\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u57fa\u7840\u6a21\u5f0f，\u7b2c 4 \u8bfe\u548c\u7b2c 9 \u8bfe\u4f1a\u7ee7\u7eed\u6df1\u5165\u3002<\/p>\n

                    \n

                    \u4e60\u9898 15：\u7efc\u5408\u9898：\u5199\u4e00\u4e2a LikeButton，\u663e\u793a\u70b9\u8d5e\u6570，\u70b9\u51fb +1，\u5e76\u7ed9\u51fa @Preview\u3002<\/h4>\n

                    \u53c2\u8003\u7b54\u6848：<\/p>\n

                    @Composable<\/span>
                    \nfun<\/span> LikeButton<\/span>(<\/span>modifier:<\/span> Modifier =<\/span> Modifier)<\/span> {<\/span>
                    \n var<\/span> likes by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

                    Column<\/span>(<\/span>
                    \n modifier =<\/span> modifier,<\/span>
                    \n horizontalAlignment =<\/span> Alignment.<\/span>CenterHorizontally,<\/span>
                    \n verticalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>8<\/span>.<\/span>dp)<\/span>
                    \n )<\/span> {<\/span>
                    \n Text<\/span>(<\/span>text =<\/span> "\u70b9\u8d5e\u6570：<\/span>$<\/span>likes<\/span><\/span>"<\/span><\/span>)<\/span>
                    \n Button<\/span>(<\/span>onClick =<\/span> {<\/span> likes++<\/span> }<\/span>)<\/span> {<\/span>
                    \n Text<\/span>(<\/span>"\u70b9\u8d5e"<\/span><\/span>)<\/span>
                    \n }<\/span>
                    \n }<\/span>
                    \n}<\/span><\/p>\n

                    @Preview<\/span>(<\/span>showBackground =<\/span> true<\/span>)<\/span>
                    \n@Composable<\/span>
                    \nfun<\/span> LikeButtonPreview<\/span>(<\/span>)<\/span> {<\/span>
                    \n MaterialTheme {<\/span>
                    \n LikeButton<\/span>(<\/span>)<\/span>
                    \n }<\/span>
                    \n}<\/span><\/p>\n

                    \u89e3\u8bfb： \u8fd9\u4e2a\u5c0f\u9898\u7efc\u5408\u4e86\u72b6\u6001\u3001\u4e8b\u4ef6\u3001\u91cd\u7ec4\u3001\u5e03\u5c40\u548c\u9884\u89c8\u3002likes \u662f\u72b6\u6001，Button \u89e6\u53d1\u4e8b\u4ef6，Text \u8bfb\u53d6\u72b6\u6001\u5e76\u81ea\u52a8\u5237\u65b0\u3002MaterialTheme \u5305\u4e00\u5c42\u53ef\u4ee5\u8ba9 Preview \u66f4\u63a5\u8fd1\u771f\u5b9e\u4e3b\u9898\u6548\u679c\u3002\u5b9e\u9645\u9879\u76ee\u4e2d，\u8fdb\u4e00\u6b65\u4f18\u5316\u53ef\u4ee5\u628a likes \u63d0\u5347\u5230\u7236\u7ec4\u4ef6，\u8ba9 LikeButton \u53d8\u6210\u65e0\u72b6\u6001\u7ec4\u4ef6，\u8fd9\u6837\u5b83\u5c31\u80fd\u5728\u4e0d\u540c\u9875\u9762\u590d\u7528\u3002<\/p>\n

                    \n

                    \u4e5d\u3001\u4f5c\u4e1a（\u542b\u53c2\u8003\u7b54\u6848\u4e0e\u89e3\u8bfb）<\/h3>\n

                    \u4f5c\u4e1a 1（\u5fc5\u505a）：\u5b8c\u6210\u8bfe\u5802\u8ba1\u6570\u5668<\/h4>\n

                    \u9898\u76ee\u8981\u6c42：<\/p>\n

                      \n
                    • \u652f\u6301 +1\u3001-1\u3001\u91cd\u7f6e\u3002<\/li>\n
                    • \u6b21\u6570\u4e0d\u80fd\u5c0f\u4e8e 0\u3002<\/li>\n
                    • \u81f3\u5c11\u4e00\u4e2a @Preview\u3002<\/li>\n<\/ul>\n

                      \u53c2\u8003\u7b54\u6848：<\/p>\n

                      @Composable<\/span>
                      \nfun<\/span> Counter<\/span>(<\/span>modifier:<\/span> Modifier =<\/span> Modifier)<\/span> {<\/span>
                      \n var<\/span> count by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>0<\/span>)<\/span> }<\/span><\/p>\n

                      Column<\/span>(<\/span>
                      \n modifier =<\/span> modifier,<\/span>
                      \n horizontalAlignment =<\/span> Alignment.<\/span>CenterHorizontally,<\/span>
                      \n verticalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>12<\/span>.<\/span>dp)<\/span>
                      \n )<\/span> {<\/span>
                      \n Text<\/span>(<\/span>
                      \n text =<\/span> "\u70b9\u51fb\u6b21\u6570：<\/span>$<\/span>count<\/span><\/span>"<\/span><\/span>,<\/span>
                      \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>titleLarge
                      \n )<\/span><\/p>\n

                      Row<\/span>(<\/span>horizontalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>12<\/span>.<\/span>dp)<\/span>)<\/span> {<\/span>
                      \n Button<\/span>(<\/span>
                      \n onClick =<\/span> {<\/span>
                      \n if<\/span> (<\/span>count ><\/span> 0<\/span>)<\/span> count—<\/span>
                      \n }<\/span>,<\/span>
                      \n enabled =<\/span> count ><\/span> 0<\/span>
                      \n )<\/span> {<\/span>
                      \n Text<\/span>(<\/span>"-1"<\/span><\/span>)<\/span>
                      \n }<\/span><\/p>\n

                      Button<\/span>(<\/span>onClick =<\/span> {<\/span> count++<\/span> }<\/span>)<\/span> {<\/span>
                      \n Text<\/span>(<\/span>"+1"<\/span><\/span>)<\/span>
                      \n }<\/span><\/p>\n

                      OutlinedButton<\/span>(<\/span>onClick =<\/span> {<\/span> count =<\/span> 0<\/span> }<\/span>)<\/span> {<\/span>
                      \n Text<\/span>(<\/span>"\u91cd\u7f6e"<\/span><\/span>)<\/span>
                      \n }<\/span>
                      \n }<\/span><\/p>\n

                      if<\/span> (<\/span>count >=<\/span> 5<\/span>)<\/span> {<\/span>
                      \n Text<\/span>(<\/span>
                      \n text =<\/span> "\u4e0d\u9519，\u5df2\u7ecf\u70b9\u51fb <\/span>$<\/span>count<\/span><\/span> \u6b21！"<\/span><\/span>,<\/span>
                      \n color =<\/span> MaterialTheme.<\/span>colorScheme.<\/span>primary
                      \n )<\/span>
                      \n }<\/span>
                      \n }<\/span>
                      \n}<\/span><\/p>\n

                      @Preview<\/span>(<\/span>showBackground =<\/span> true<\/span>,<\/span> name =<\/span> "\u8ba1\u6570\u5668\u9884\u89c8"<\/span><\/span>)<\/span>
                      \n@Composable<\/span>
                      \nfun<\/span> CounterPreview<\/span>(<\/span>)<\/span> {<\/span>
                      \n MaterialTheme {<\/span>
                      \n Counter<\/span>(<\/span>)<\/span>
                      \n }<\/span>
                      \n}<\/span><\/p>\n

                      \u89e3\u8bfb：<\/p>\n

                        \n
                      • count \u662f\u552f\u4e00\u72b6\u6001，\u754c\u9762\u5b8c\u5168\u7531\u5b83\u9a71\u52a8\u3002<\/li>\n
                      • enabled = count > 0 \u8ba9"-1"\u6309\u94ae\u5728 0 \u65f6\u4e0d\u53ef\u70b9\u51fb\u3002<\/li>\n
                      • onClick \u91cc\u518d\u5199 if (count > 0) count– \u662f\u53cc\u91cd\u4fdd\u62a4，\u907f\u514d\u6781\u7aef\u60c5\u51b5\u4e0b\u51fa\u73b0\u8d1f\u6570\u3002<\/li>\n
                      • if (count >= 5) \u662f Compose \u7684\u6761\u4ef6\u6e32\u67d3，\u4e0d\u662f\u9690\u85cf，\u800c\u662f\u51b3\u5b9a\u8fd9\u6bb5 UI \u662f\u5426\u8fdb\u5165\u7ec4\u5408\u3002<\/li>\n
                      • @Preview \u53ef\u4ee5\u5355\u72ec\u9884\u89c8 Counter，\u4e0d\u9700\u8981\u8fd0\u884c\u6574\u4e2a App\u3002<\/li>\n<\/ul>\n
                        \n

                        \u4f5c\u4e1a 2（\u9009\u505a）：\u5236\u4f5c"\u4e2a\u4eba\u540d\u7247"\u9875\u9762<\/h4>\n

                        \u9898\u76ee\u8981\u6c42：<\/p>\n

                          \n
                        • \u663e\u793a\u59d3\u540d\u3001\u7b80\u4ecb\u3001\u6280\u80fd\u6807\u7b7e\u3002<\/li>\n
                        • \u4e00\u4e2a\u6309\u94ae\u5207\u6362"\u5728\u7ebf\/\u79bb\u7ebf"\u72b6\u6001\u3002<\/li>\n
                        • \u5728\u7ebf\u65f6\u6587\u5b57\u4e3a\u7eff\u8272，\u79bb\u7ebf\u65f6\u4e3a\u7070\u8272\u3002<\/li>\n<\/ul>\n

                          \u53c2\u8003\u7b54\u6848：<\/p>\n

                          @Composable<\/span>
                          \nfun<\/span> ProfileCard<\/span>(<\/span>modifier:<\/span> Modifier =<\/span> Modifier)<\/span> {<\/span>
                          \n var<\/span> isOnline by<\/span> remember {<\/span> mutableStateOf<\/span>(<\/span>true<\/span>)<\/span> }<\/span><\/p>\n

                          val<\/span> statusColor =<\/span> if<\/span> (<\/span>isOnline)<\/span> Color<\/span>(<\/span>0xFF2E7D32<\/span>)<\/span> else<\/span> Color.<\/span>Gray
                          \n val<\/span> statusText =<\/span> if<\/span> (<\/span>isOnline)<\/span> "\u5728\u7ebf"<\/span><\/span> else<\/span> "\u79bb\u7ebf"<\/span><\/span><\/p>\n

                          Column<\/span>(<\/span>
                          \n modifier =<\/span> modifier
                          \n .<\/span>fillMaxWidth<\/span>(<\/span>)<\/span>
                          \n .<\/span>padding<\/span>(<\/span>24<\/span>.<\/span>dp)<\/span>,<\/span>
                          \n horizontalAlignment =<\/span> Alignment.<\/span>CenterHorizontally,<\/span>
                          \n verticalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>12<\/span>.<\/span>dp)<\/span>
                          \n )<\/span> {<\/span>
                          \n Box<\/span>(<\/span>
                          \n modifier =<\/span> Modifier
                          \n .<\/span>size<\/span>(<\/span>80<\/span>.<\/span>dp)<\/span>
                          \n .<\/span>clip<\/span>(<\/span>CircleShape)<\/span>
                          \n .<\/span>background<\/span>(<\/span>MaterialTheme.<\/span>colorScheme.<\/span>primary)<\/span>,<\/span>
                          \n contentAlignment =<\/span> Alignment.<\/span>Center
                          \n )<\/span> {<\/span>
                          \n Text<\/span>(<\/span>
                          \n text =<\/span> "\u5f20"<\/span><\/span>,<\/span>
                          \n color =<\/span> Color.<\/span>White,<\/span>
                          \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>headlineMedium,<\/span>
                          \n fontWeight =<\/span> FontWeight.<\/span>Bold
                          \n )<\/span>
                          \n }<\/span><\/p>\n

                          Text<\/span>(<\/span>
                          \n text =<\/span> "\u5f20\u4e09"<\/span><\/span>,<\/span>
                          \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>headlineSmall
                          \n )<\/span><\/p>\n

                          Text<\/span>(<\/span>
                          \n text =<\/span> "Android \u5f00\u53d1\u8005，\u70ed\u7231 Compose"<\/span><\/span>,<\/span>
                          \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>bodyMedium
                          \n )<\/span><\/p>\n

                          Row<\/span>(<\/span>horizontalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>8<\/span>.<\/span>dp)<\/span>)<\/span> {<\/span>
                          \n SkillTag<\/span>(<\/span>"Kotlin"<\/span><\/span>)<\/span>
                          \n SkillTag<\/span>(<\/span>"Compose"<\/span><\/span>)<\/span>
                          \n SkillTag<\/span>(<\/span>"Android"<\/span><\/span>)<\/span>
                          \n }<\/span><\/p>\n

                          Row<\/span>(<\/span>
                          \n verticalAlignment =<\/span> Alignment.<\/span>CenterVertically,<\/span>
                          \n horizontalArrangement =<\/span> Arrangement.<\/span>spacedBy<\/span>(<\/span>8<\/span>.<\/span>dp)<\/span>
                          \n )<\/span> {<\/span>
                          \n Box<\/span>(<\/span>
                          \n modifier =<\/span> Modifier
                          \n .<\/span>size<\/span>(<\/span>10<\/span>.<\/span>dp)<\/span>
                          \n .<\/span>clip<\/span>(<\/span>CircleShape)<\/span>
                          \n .<\/span>background<\/span>(<\/span>statusColor)<\/span>
                          \n )<\/span>
                          \n Text<\/span>(<\/span>
                          \n text =<\/span> statusText,<\/span>
                          \n color =<\/span> statusColor
                          \n )<\/span>
                          \n }<\/span><\/p>\n

                          Button<\/span>(<\/span>onClick =<\/span> {<\/span> isOnline =<\/span> !<\/span>isOnline }<\/span>)<\/span> {<\/span>
                          \n Text<\/span>(<\/span>if<\/span> (<\/span>isOnline)<\/span> "\u5207\u6362\u4e3a\u79bb\u7ebf"<\/span><\/span> else<\/span> "\u5207\u6362\u4e3a\u5728\u7ebf"<\/span><\/span>)<\/span>
                          \n }<\/span>
                          \n }<\/span>
                          \n}<\/span><\/p>\n

                          @Composable<\/span>
                          \nprivate<\/span> fun<\/span> SkillTag<\/span>(<\/span>text:<\/span> String)<\/span> {<\/span>
                          \n Surface<\/span>(<\/span>
                          \n shape =<\/span> MaterialTheme.<\/span>shapes.<\/span>small,<\/span>
                          \n color =<\/span> MaterialTheme.<\/span>colorScheme.<\/span>secondaryContainer
                          \n )<\/span> {<\/span>
                          \n Text<\/span>(<\/span>
                          \n text =<\/span> text,<\/span>
                          \n modifier =<\/span> Modifier.<\/span>padding<\/span>(<\/span>horizontal =<\/span> 10<\/span>.<\/span>dp,<\/span> vertical =<\/span> 6<\/span>.<\/span>dp)<\/span>,<\/span>
                          \n style =<\/span> MaterialTheme.<\/span>typography.<\/span>labelMedium
                          \n )<\/span>
                          \n }<\/span>
                          \n}<\/span><\/p>\n

                          @Preview<\/span>(<\/span>showBackground =<\/span> true<\/span>,<\/span> name =<\/span> "\u4e2a\u4eba\u540d\u7247\u9884\u89c8"<\/span><\/span>)<\/span>
                          \n@Composable<\/span>
                          \nfun<\/span> ProfileCardPreview<\/span>(<\/span>)<\/span> {<\/span>
                          \n MaterialTheme {<\/span>
                          \n ProfileCard<\/span>(<\/span>)<\/span>
                          \n }<\/span>
                          \n}<\/span><\/p>\n

                          \u89e3\u8bfb：<\/p>\n

                            \n
                          • isOnline \u662f\u72b6\u6001，statusColor \u548c statusText \u662f\u7531\u72b6\u6001\u6d3e\u751f\u51fa\u6765\u7684\u503c\u3002<\/li>\n
                          • \u70b9\u51fb\u6309\u94ae\u540e\u4fee\u6539 isOnline，\u8bfb\u53d6\u5b83\u7684 Text\u3001Box\u3001Button \u4f1a\u81ea\u52a8\u91cd\u7ec4\u3002<\/li>\n
                          • SkillTag \u88ab\u62c6\u6210\u72ec\u7acb Composable，\u4f53\u73b0\u7ec4\u4ef6\u5316\u601d\u60f3，\u540e\u7eed\u53ef\u4ee5\u590d\u7528\u3002<\/li>\n
                          • Modifier \u987a\u5e8f\u5f88\u91cd\u8981：size -> clip -> background \u624d\u80fd\u5f97\u5230\u5706\u5f62\u80cc\u666f；\u5982\u679c\u987a\u5e8f\u9519\u8bef，\u80cc\u666f\u53ef\u80fd\u4e0d\u662f\u5706\u5f62\u3002<\/li>\n
                          • \u5b9e\u9645\u9879\u76ee\u4e2d\u53ef\u4ee5\u8fdb\u4e00\u6b65\u505a\u72b6\u6001\u63d0\u5347，\u628a isOnline \u63d0\u5230\u7236\u7ec4\u4ef6，\u8ba9 ProfileCard \u53d8\u6210\u65e0\u72b6\u6001\u7ec4\u4ef6，\u66f4\u5bb9\u6613\u6d4b\u8bd5\u548c\u9884\u89c8\u3002<\/li>\n<\/ul>\n
                            \n

                            \u4f5c\u4e1a 3（\u63d0\u4ea4）：\u4ee3\u7801\u6587\u4ef6\u6216 Git \u4ed3\u5e93\u94fe\u63a5<\/h4>\n

                            \u9898\u76ee\u8981\u6c42：<\/p>\n

                              \n
                            • \u63d0\u4ea4\u4ee3\u7801\u6587\u4ef6\u6216 Git \u4ed3\u5e93\u94fe\u63a5\u3002<\/li>\n<\/ul>\n

                              \u53c2\u8003\u7b54\u6848：<\/p>\n

                              \u9879\u76ee\u7ed3\u6784\u5efa\u8bae：<\/p>\n

                              ComposeFirst\/
                              \n\u251c\u2500\u2500 app\/
                              \n\u2502 \u2514\u2500\u2500 src\/main\/java\/com\/example\/composefirst\/
                              \n\u2502 \u2514\u2500\u2500 MainActivity.kt
                              \n\u2514\u2500\u2500 README.md<\/p>\n

                              Git \u63d0\u4ea4\u547d\u4ee4\u793a\u4f8b：<\/p>\n

                              git<\/span> init
                              \ngit<\/span> add<\/span> .<\/span>
                              \ngit<\/span> commit -m<\/span> "\u7b2c1\u8bfe\u4f5c\u4e1a：\u8ba1\u6570\u5668\u4e0e\u4e2a\u4eba\u540d\u7247"<\/span>
                              \ngit<\/span> branch -M<\/span> main
                              \ngit<\/span> remote add<\/span> origin <<\/span>\u4f60\u7684\u4ed3\u5e93\u5730\u5740><\/span>
                              \ngit<\/span> push -u<\/span> origin main<\/p>\n

                              README.md \u6a21\u677f：<\/p>\n

                              # \u7b2c 1 \u8bfe\u4f5c\u4e1a<\/p>\n

                              ## \u529f\u80fd<\/p>\n

                              – \u8ba1\u6570\u5668：+1\u3001-1\u3001\u91cd\u7f6e，\u6b21\u6570\u4e0d\u5c0f\u4e8e 0
                              \n– \u4e2a\u4eba\u540d\u7247：\u59d3\u540d\u3001\u7b80\u4ecb\u3001\u6280\u80fd\u6807\u7b7e\u3001\u5728\u7ebf\/\u79bb\u7ebf\u5207\u6362<\/p>\n

                              ## \u8fd0\u884c\u73af\u5883<\/p>\n

                              – Android Studio \u7a33\u5b9a\u7248
                              \n– Kotlin
                              \n– Jetpack Compose
                              \n– Material 3<\/p>\n

                              ## \u622a\u56fe<\/p>\n

                              （\u5728\u6b64\u5904\u63d2\u5165\u8fd0\u884c\u622a\u56fe）<\/p>\n

                              \u89e3\u8bfb：<\/p>\n

                                \n
                              • \u63d0\u4ea4\u4ee3\u7801\u65f6\u4e0d\u8981\u63d0\u4ea4 build\/\u3001.gradle\/ \u7b49\u751f\u6210\u76ee\u5f55\u3002<\/li>\n
                              • \u63a8\u8350\u4f7f\u7528 .gitignore \u5ffd\u7565\u6784\u5efa\u4ea7\u7269\u3002<\/li>\n
                              • README.md \u80fd\u8ba9\u522b\u4eba\u5feb\u901f\u77e5\u9053\u9879\u76ee\u505a\u4e86\u4ec0\u4e48\u3001\u600e\u4e48\u8fd0\u884c\u3002<\/li>\n
                              • \u5982\u679c\u662f\u8bfe\u5802\u63d0\u4ea4，\u81f3\u5c11\u4fdd\u8bc1\u9879\u76ee\u80fd\u7f16\u8bd1\u3001\u80fd\u8fd0\u884c\u3001\u6709 @Preview\u3002<\/li>\n<\/ul>\n
                                \n

                                \u4f5c\u4e1a 4（\u63d0\u4ea4）：\u8fd0\u884c\u622a\u56fe<\/h4>\n

                                \u9898\u76ee\u8981\u6c42：<\/p>\n

                                  \n
                                • \u63d0\u4ea4\u8fd0\u884c\u622a\u56fe\u3002<\/li>\n<\/ul>\n

                                  \u53c2\u8003\u7b54\u6848：<\/p>\n

                                  \u5efa\u8bae\u81f3\u5c11\u63d0\u4ea4\u4ee5\u4e0b\u622a\u56fe：<\/p>\n

                                • \u8ba1\u6570\u5668\u521d\u59cb\u72b6\u6001：\u70b9\u51fb\u6b21\u6570：0<\/li>\n
                                • \u70b9\u51fb +1 \u5230 5 \u6b21：\u663e\u793a\u9f13\u52b1\u6587\u5b57<\/li>\n
                                • \u70b9\u51fb\u91cd\u7f6e：\u56de\u5230 \u70b9\u51fb\u6b21\u6570：0<\/li>\n
                                • \u4e2a\u4eba\u540d\u7247"\u5728\u7ebf"\u72b6\u6001<\/li>\n
                                • \u4e2a\u4eba\u540d\u7247"\u79bb\u7ebf"\u72b6\u6001<\/li>\n

                                  \u89e3\u8bfb：<\/p>\n

                                    \n
                                  • \u622a\u56fe\u4e0d\u662f\u5f62\u5f0f，\u800c\u662f\u8bc1\u660e\u529f\u80fd\u771f\u5b9e\u53ef\u8fd0\u884c\u3002<\/li>\n
                                  • \u622a\u56fe\u6700\u597d\u5305\u542b\u6a21\u62df\u5668\u6216\u771f\u673a\u72b6\u6001\u680f，\u907f\u514d\u53ea\u622a\u5c40\u90e8\u5bfc\u81f4\u65e0\u6cd5\u5224\u65ad\u662f\u5426\u8fd0\u884c\u6210\u529f\u3002<\/li>\n
                                  • \u5982\u679c\u505a\u9009\u505a\u9898，\u5efa\u8bae\u628a\u5728\u7ebf\u548c\u79bb\u7ebf\u4e24\u79cd\u72b6\u6001\u90fd\u622a\u51fa\u6765，\u4f53\u73b0\u72b6\u6001\u9a71\u52a8 UI \u7684\u6548\u679c\u3002<\/li>\n<\/ul>\n
                                    \n

                                    \u4f5c\u4e1a 5（\u63d0\u4ea4）：200 \u5b57\u5b66\u4e60\u603b\u7ed3<\/h4>\n

                                    \u9898\u76ee\u8981\u6c42：<\/p>\n

                                      \n
                                    • \u5199 200 \u5b57\u5b66\u4e60\u603b\u7ed3：\u4ec0\u4e48\u662f\u58f0\u660e\u5f0f UI？\u4ec0\u4e48\u662f\u91cd\u7ec4？<\/li>\n<\/ul>\n

                                      \u53c2\u8003\u7b54\u6848：<\/p>\n

                                      \u672c\u8bfe\u8ba9\u6211\u7406\u89e3\u4e86 Compose \u7684\u58f0\u660e\u5f0f\u601d\u60f3：UI = f(state)\u3002\u4f20\u7edf View \u9700\u8981\u5148 findViewById，\u518d\u624b\u52a8\u4fee\u6539\u63a7\u4ef6；\u800c Compose \u53ea\u9700\u8981\u58f0\u660e\u72b6\u6001\u4e0e\u754c\u9762\u7684\u5173\u7cfb\u3002\u8ba1\u6570\u5668\u4f8b\u5b50\u4e2d，count \u7528 remember \u548c mutableStateOf \u4fdd\u5b58，\u70b9\u51fb\u6309\u94ae\u6539\u53d8\u72b6\u6001\u540e，\u8bfb\u53d6 count \u7684 Text \u4f1a\u81ea\u52a8\u91cd\u7ec4\u3002\u6211\u8fd8\u5b66\u4f1a\u4e86 Column\u3001Row\u3001Modifier\u3001@Preview \u7684\u57fa\u672c\u7528\u6cd5，\u4ee5\u53ca\u7528 if \u505a\u6761\u4ef6\u6e32\u67d3\u3002\u4f5c\u4e1a\u4e2d\u901a\u8fc7"-1"\u6309\u94ae\u7981\u7528\u548c"\u91cd\u7f6e"\u6309\u94ae，\u52a0\u6df1\u4e86\u5bf9 enabled \u548c\u72b6\u6001\u9a71\u52a8\u754c\u9762\u7684\u7406\u89e3\u3002\u91cd\u7ec4\u4e0d\u662f\u91cd\u5efa\u6574\u4e2a Activity，\u800c\u662f\u72b6\u6001\u53d8\u5316\u540e\u91cd\u65b0\u6267\u884c\u76f8\u5173 Composable\u3002\u540e\u7eed\u6211\u4f1a\u7ee7\u7eed\u5b66\u4e60\u5e03\u5c40\u3001\u72b6\u6001\u63d0\u5347\u548c\u67b6\u6784，\u5199\u51fa\u66f4\u53ef\u590d\u7528\u7684 Compose \u7ec4\u4ef6\u3002<\/p>\n

                                      \u89e3\u8bfb：<\/p>\n

                                        \n
                                      • \u603b\u7ed3\u4e2d\u5e94\u51fa\u73b0\u5173\u952e\u8bcd：\u58f0\u660e\u5f0f UI\u3001UI = f(state)\u3001\u72b6\u6001\u3001remember\u3001mutableStateOf\u3001\u91cd\u7ec4\u3001Composable\u3001\u72b6\u6001\u9a71\u52a8\u3002<\/li>\n
                                      • \u4e0d\u8981\u53ea\u5199"\u5b66\u4f1a\u4e86\u6309\u94ae\u548c\u6587\u5b57"，\u8981\u5199\u6e05\u695a"\u4e3a\u4ec0\u4e48\u72b6\u6001\u53d8\u5316\u80fd\u81ea\u52a8\u5237\u65b0\u754c\u9762"\u3002<\/li>\n
                                      • \u5982\u679c\u80fd\u7ed3\u5408\u81ea\u5df1\u8e29\u8fc7\u7684\u5751，\u4f8b\u5982"\u666e\u901a\u53d8\u91cf\u4e0d\u4f1a\u89e6\u53d1\u91cd\u7ec4"，\u603b\u7ed3\u4f1a\u66f4\u6709\u6df1\u5ea6\u3002<\/li>\n<\/ul>\n
                                        \n

                                        \u5341\u3001\u5e38\u89c1\u5751\u4e0e\u8c03\u8bd5\u5efa\u8bae<\/h3>\n
                                      • \n

                                        setContent \u627e\u4e0d\u5230
                                        \n\u68c0\u67e5 activity-compose \u4f9d\u8d56\u662f\u5426\u914d\u7f6e\u3002<\/p>\n<\/li>\n

                                      • \n

                                        by remember \u62a5\u9519
                                        \n\u5bfc\u5165 androidx.compose.runtime.getValue \u548c setValue，\u6216\u4f7f\u7528 import androidx.compose.runtime.*\u3002<\/p>\n<\/li>\n

                                      • \n

                                        Preview \u4e0d\u5237\u65b0
                                        \n\u6267\u884c Build > Make Project，\u68c0\u67e5 @Preview \u662f\u5426\u52a0\u5728 Composable \u4e0a\u3002<\/p>\n<\/li>\n

                                      • \n

                                        \u72b6\u6001\u4e0d\u66f4\u65b0
                                        \n\u786e\u8ba4\u4f7f\u7528\u4e86 remember \u548c mutableStateOf，\u800c\u4e0d\u662f\u666e\u901a\u53d8\u91cf\u3002<\/p>\n<\/li>\n

                                      • \n

                                        \u5728 Composable \u4e2d\u5199\u526f\u4f5c\u7528
                                        \n\u4e0d\u8981\u5728 Composable \u91cc\u76f4\u63a5\u53d1\u7f51\u7edc\u8bf7\u6c42\u3001\u5199\u6570\u636e\u5e93\u3001\u6539\u5916\u90e8\u53d8\u91cf\u3002\u526f\u4f5c\u7528\u5e94\u653e\u5230 LaunchedEffect\u3001DisposableEffect \u7b49 API \u4e2d\u3002<\/p>\n<\/li>\n

                                      • \n

                                        \u65e0\u9650\u91cd\u7ec4
                                        \n\u5982\u679c\u5728 Composable \u6267\u884c\u671f\u95f4\u76f4\u63a5\u4fee\u6539\u72b6\u6001，\u53ef\u80fd\u5bfc\u81f4\u65e0\u9650\u91cd\u7ec4\u3002\u72b6\u6001\u4fee\u6539\u5e94\u53d1\u751f\u5728\u4e8b\u4ef6\u56de\u8c03\u6216\u526f\u4f5c\u7528\u4e2d\u3002<\/p>\n<\/li>\n

                                      • \n

                                        Composable \u547d\u540d\u4e0d\u89c4\u8303
                                        \n\u5efa\u8bae\u9996\u5b57\u6bcd\u5927\u5199，\u4fbf\u4e8e\u8bc6\u522b\u3002<\/p>\n<\/li>\n

                                      • \n

                                        Modifier \u987a\u5e8f\u6df7\u4e71
                                        \nModifier \u987a\u5e8f\u4f1a\u5f71\u54cd\u5b9e\u9645\u6548\u679c\u3002\u4f8b\u5982 padding \u548c background \u7684\u5148\u540e\u987a\u5e8f\u4f1a\u5bfc\u81f4\u80cc\u666f\u8303\u56f4\u4e0d\u540c\u3002<\/p>\n<\/li>\n

                                      • \n

                                        remember \u4f4d\u7f6e\u53d8\u5316
                                        \nremember \u4f9d\u8d56\u8c03\u7528\u4f4d\u7f6e\u3002\u5982\u679c\u5b83\u51fa\u73b0\u5728\u6761\u4ef6\u5206\u652f\u4e2d，\u4f4d\u7f6e\u53d8\u5316\u53ef\u80fd\u5bfc\u81f4\u72b6\u6001\u91cd\u7f6e\u3002<\/p>\n<\/li>\n

                                      • \n

                                        \u9700\u8981\u8de8\u914d\u7f6e\u53d8\u66f4\u4fdd\u5b58\u72b6\u6001
                                        \n\u7b2c 1 \u8bfe\u5148\u7528 remember\u3002\u5982\u679c\u8981\u5c4f\u5e55\u65cb\u8f6c\u540e\u4ecd\u4fdd\u5b58，\u9700\u8981\u5b66\u4e60 rememberSaveable\u3002<\/p>\n<\/li>\n

                                        \n

                                        \u5341\u4e00\u3001\u672c\u8282\u8bfe\u77e5\u8bc6\u70b9\u603b\u7ed3<\/h3>\n

                                        11.1 \u6838\u5fc3\u6982\u5ff5<\/h4>\n
                                      • \u58f0\u660e\u5f0f UI \u6838\u5fc3\u601d\u60f3：UI = f(state)，\u72b6\u6001\u9a71\u52a8\u754c\u9762\u3002<\/li>\n
                                      • \u547d\u4ee4\u5f0f\u4e0e\u58f0\u660e\u5f0f\u533a\u522b：\u547d\u4ee4\u5f0f\u624b\u52a8\u627e\u63a7\u4ef6\u3001\u6539\u63a7\u4ef6；\u58f0\u660e\u5f0f\u63cf\u8ff0\u72b6\u6001\u4e0e UI \u7684\u5173\u7cfb，\u7531\u6846\u67b6\u66f4\u65b0\u3002<\/li>\n
                                      • \u7ec4\u5408：Composable \u6267\u884c\u540e\u5f62\u6210\u7684 UI \u63cf\u8ff0\u6811\u3002<\/li>\n
                                      • \u91cd\u7ec4：\u72b6\u6001\u53d8\u5316\u540e，\u91cd\u65b0\u6267\u884c\u76f8\u5173 Composable \u7684\u8fc7\u7a0b\u3002<\/li>\n
                                      • \u72b6\u6001\u8bfb\u53d6\u8ffd\u8e2a：Compose \u8bb0\u5f55\u8c01\u8bfb\u53d6\u4e86\u54ea\u4e2a\u72b6\u6001，\u4ece\u800c\u7cbe\u51c6\u89e6\u53d1\u91cd\u7ec4\u3002<\/li>\n
                                      • \u4f4d\u7f6e\u8bb0\u5fc6：remember \u6309\u8c03\u7528\u4f4d\u7f6e\u4fdd\u5b58\u72b6\u6001\u3002<\/li>\n
                                      • \u5e42\u7b49\u6027：Composable \u5e94\u80fd\u5b89\u5168\u5730\u91cd\u590d\u6267\u884c，\u4e0d\u4ea7\u751f\u4e0d\u53ef\u63a7\u526f\u4f5c\u7528\u3002<\/li>\n

                                        11.2 API \u4e0e\u5199\u6cd5<\/h4>\n
                                      • Compose \u5165\u53e3：Activity \u4e2d\u4f7f\u7528 setContent { … }\u3002<\/li>\n
                                      • Composable \u51fd\u6570：\u4f7f\u7528 @Composable \u6ce8\u89e3，\u51fd\u6570\u540d\u5efa\u8bae\u9996\u5b57\u6bcd\u5927\u5199\u3002<\/li>\n
                                      • \u9884\u89c8\u5de5\u5177：\u4f7f\u7528 @Preview \u5728 Android Studio \u4e2d\u76f4\u63a5\u67e5\u770b UI\u3002<\/li>\n
                                      • \u72b6\u6001\u7ba1\u7406\u57fa\u7840：mutableStateOf \u521b\u5efa\u53ef\u89c2\u5bdf\u72b6\u6001，remember \u8de8\u91cd\u7ec4\u4fdd\u5b58\u72b6\u6001\u3002<\/li>\n
                                      • \u57fa\u7840\u5e03\u5c40：Column \u5782\u76f4\u6392\u5217，Row \u6c34\u5e73\u6392\u5217，Box \u5c42\u53e0\u6392\u5217\u3002<\/li>\n
                                      • \u5bf9\u9f50\u4e0e\u95f4\u8ddd：Arrangement \u63a7\u5236\u4e3b\u8f74\u6392\u5217，Alignment \u63a7\u5236\u4ea4\u53c9\u8f74\u5bf9\u9f50\u3002<\/li>\n
                                      • Modifier：\u94fe\u5f0f\u914d\u7f6e UI，\u5982 padding\u3001size\u3001background\u3001clickable \u7b49\u3002<\/li>\n
                                      • \u6761\u4ef6\u6e32\u67d3：Compose \u4e2d\u53ef\u76f4\u63a5\u7528 if \u63a7\u5236\u67d0\u6bb5 UI \u662f\u5426\u663e\u793a\u3002<\/li>\n
                                      • \u72b6\u6001\u63d0\u5347：\u72b6\u6001\u7531\u7236\u7ec4\u4ef6\u6301\u6709，\u5b50\u7ec4\u4ef6\u63a5\u6536\u6570\u636e\u548c\u4e8b\u4ef6\u56de\u8c03，\u5f62\u6210\u5355\u5411\u6570\u636e\u6d41\u3002<\/li>\n

                                        11.3 \u5e38\u89c1\u5751<\/h4>\n
                                      • \u666e\u901a\u53d8\u91cf\u4e0d\u4f1a\u89e6\u53d1\u91cd\u7ec4\u3002<\/li>\n
                                      • \u5fd8\u8bb0\u5bfc\u5165 getValue \/ setValue\u3002<\/li>\n
                                      • \u5728 Composable \u4e2d\u5199\u590d\u6742\u526f\u4f5c\u7528\u3002<\/li>\n
                                      • Preview \u4e0d\u5237\u65b0\u65f6\u5148 Make Project\u3002<\/li>\n
                                      • Modifier \u987a\u5e8f\u9519\u8bef\u5bfc\u81f4\u6548\u679c\u4e0d\u7b26\u3002<\/li>\n
                                      • remember \u4f4d\u7f6e\u53d8\u5316\u5bfc\u81f4\u72b6\u6001\u91cd\u7f6e\u3002<\/li>\n
                                        \n

                                        \u5341\u4e8c\u3001\u4e0b\u8282\u9884\u544a<\/h3>\n

                                        \u7b2c 2 \u8bfe：\u5e03\u5c40\u7cfb\u7edf：\u7528 Column\u3001Row\u3001Box \u642d\u51fa\u4e2a\u4eba\u540d\u7247\u3002<\/p>\n

                                        \u4f60\u5c06\u638c\u63e1：<\/p>\n

                                          \n
                                        • Column \u5782\u76f4\u5e03\u5c40<\/li>\n
                                        • Row \u6c34\u5e73\u5e03\u5c40<\/li>\n
                                        • Box \u5c42\u53e0\u5e03\u5c40<\/li>\n
                                        • Spacer \u95f4\u8ddd<\/li>\n
                                        • Arrangement \u4e0e Alignment<\/li>\n
                                        • \u7528\u5e03\u5c40\u7ec4\u5408\u51fa\u771f\u5b9e\u9875\u9762\u7ed3\u6784<\/li>\n
                                        • \u4e2a\u4eba\u540d\u7247\u5b9e\u6218：\u5934\u50cf\u3001\u59d3\u540d\u3001\u7b80\u4ecb\u3001\u6280\u80fd\u6807\u7b7e\u3001\u793e\u4ea4\u6309\u94ae<\/li>\n<\/ul>\n
                                          \n

                                          \u9644：\u7cfb\u5217 20 \u8bfe\u89c4\u5212（\u5df2\u66f4\u65b0\u6700\u540e\u4e24\u8bfe）<\/h3>\n\n\u8bfe\u6b21\u4e3b\u9898\u6838\u5fc3\u5185\u5bb9\u5b9e\u6218\u4ea7\u51fa<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                                          1<\/td>\n\u5f00\u8bfe\u4e0e\u7b2c\u4e00\u4e2a Compose<\/td>\n\u58f0\u660e\u5f0f UI\u3001\u73af\u5883\u642d\u5efa\u3001@Composable\u3001@Preview<\/td>\n\u8ba1\u6570\u5668<\/td>\n<\/tr>\n
                                          2<\/td>\n\u5e03\u5c40\u7cfb\u7edf<\/td>\nColumn\u3001Row\u3001Box\u3001Spacer\u3001Arrangement\u3001Alignment<\/td>\n\u4e2a\u4eba\u540d\u7247<\/td>\n<\/tr>\n
                                          3<\/td>\nModifier \u4e0e\u6837\u5f0f<\/td>\npadding\u3001size\u3001background\u3001border\u3001clip\u3001clickable<\/td>\n\u5361\u7247\u6837\u5f0f<\/td>\n<\/tr>\n
                                          4<\/td>\n\u72b6\u6001\u4e0e\u91cd\u7ec4<\/td>\nremember\u3001mutableStateOf\u3001State Hoisting<\/td>\n\u8d2d\u7269\u8f66\u6570\u91cf<\/td>\n<\/tr>\n
                                          5<\/td>\n\u5217\u8868\u4e0e\u811a\u624b\u67b6<\/td>\nLazyColumn\u3001LazyRow\u3001Scaffold\u3001TopAppBar<\/td>\n\u5f85\u529e\u5217\u8868<\/td>\n<\/tr>\n
                                          6<\/td>\n\u8f93\u5165\u4e0e\u8868\u5355<\/td>\nTextField\u3001Checkbox\u3001Switch\u3001RadioButton<\/td>\n\u767b\u5f55\u8868\u5355<\/td>\n<\/tr>\n
                                          7<\/td>\n\u4e3b\u9898\u4e0e\u8bbe\u8ba1\u7cfb\u7edf<\/td>\nMaterial 3\u3001ColorScheme\u3001Typography\u3001Shape\u3001\u6697\u9ed1\u6a21\u5f0f<\/td>\n\u4e00\u952e\u6362\u80a4<\/td>\n<\/tr>\n
                                          8<\/td>\n\u5bfc\u822a<\/td>\nNavigation Compose\u3001\u8def\u7531\u3001\u53c2\u6570\u3001\u5e95\u90e8\u5bfc\u822a<\/td>\n\u4e09\u9875\u5bfc\u822a<\/td>\n<\/tr>\n
                                          9<\/td>\n\u67b6\u6784\u4e0e\u72b6\u6001\u7ba1\u7406<\/td>\nViewModel\u3001UiState\u3001\u5355\u5411\u6570\u636e\u6d41\u3001Repository<\/td>\n\u67b6\u6784\u7248\u8ba1\u6570\u5668<\/td>\n<\/tr>\n
                                          10<\/td>\n\u526f\u4f5c\u7528<\/td>\nLaunchedEffect\u3001DisposableEffect\u3001rememberCoroutineScope<\/td>\n\u6a21\u62df\u52a0\u8f7d\u6570\u636e<\/td>\n<\/tr>\n
                                          11<\/td>\n\u52a8\u753b<\/td>\nanimate*AsState\u3001AnimatedVisibility\u3001Crossfade\u3001Transition<\/td>\n\u5c55\u5f00\u5361\u7247<\/td>\n<\/tr>\n
                                          12<\/td>\n\u624b\u52bf\u4e0e\u4ea4\u4e92<\/td>\nclickable\u3001pointerInput\u3001draggable\u3001swipe<\/td>\n\u6ed1\u52a8\u5220\u9664<\/td>\n<\/tr>\n
                                          13<\/td>\n\u81ea\u5b9a\u4e49\u5e03\u5c40\u4e0e\u7ed8\u5236<\/td>\nLayout\u3001Canvas\u3001DrawScope\u3001SubcomposeLayout<\/td>\n\u73af\u5f62\u8fdb\u5ea6\u6761<\/td>\n<\/tr>\n
                                          14<\/td>\n\u6027\u80fd\u4f18\u5316<\/td>\n\u91cd\u7ec4\u8303\u56f4\u3001\u7a33\u5b9a\u6027\u3001derivedStateOf\u3001key<\/td>\n\u4f18\u5316\u957f\u5217\u8868<\/td>\n<\/tr>\n
                                          15<\/td>\n\u6d4b\u8bd5<\/td>\nCompose UI Test\u3001\u8bed\u4e49\u3001\u5355\u5143\u6d4b\u8bd5<\/td>\n\u6d4b\u8bd5\u8ba1\u6570\u5668<\/td>\n<\/tr>\n
                                          16<\/td>\n\u4e92\u64cd\u4f5c<\/td>\nAndroidView\u3001ComposeView\u3001View\/Fragment \u6df7\u5408<\/td>\n\u5d4c\u5165\u65e7 View<\/td>\n<\/tr>\n
                                          17<\/td>\n\u5de5\u7a0b\u5316<\/td>\n\u591a\u6a21\u5757\u3001Hilt\/Koin\u3001\u8d44\u6e90\u3001\u9884\u89c8\u3001\u8c03\u8bd5\u5de5\u5177<\/td>\n\u6a21\u5757\u62c6\u5206<\/td>\n<\/tr>\n
                                          18<\/td>\n\u54cd\u5e94\u5f0f\u4e0e\u81ea\u9002\u5e94<\/td>\nWindowSizeClass\u3001\u5e73\u677f\u3001\u6298\u53e0\u5c4f\u3001\u591a\u7a97\u53e3<\/td>\n\u81ea\u9002\u5e94\u5217\u8868<\/td>\n<\/tr>\n
                                          19<\/td>\n\u7ecf\u5178\u793a\u4f8b\u6df1\u5ea6\u89e3\u8bfb\u4e00<\/td>\n\u9009\u53d6\u7ecf\u5178 Compose \u793a\u4f8b，\u6df1\u5ea6\u89e3\u8bfb\u5e03\u5c40\u3001\u72b6\u6001\u3001\u5217\u8868\u3001\u4e3b\u9898\u3001\u52a8\u753b\u3001\u5bfc\u822a\u7b49\u6838\u5fc3\u5b9e\u73b0<\/td>\n\u62c6\u89e3\u5e76\u91cd\u5199\u5173\u952e\u9875\u9762<\/td>\n<\/tr>\n
                                          20<\/td>\n\u7ecf\u5178\u793a\u4f8b\u6df1\u5ea6\u89e3\u8bfb\u4e8c<\/td>\n\u9009\u53d6\u7ecf\u5178\u67b6\u6784\u793a\u4f8b，\u6df1\u5ea6\u89e3\u8bfb ViewModel\u3001\u6570\u636e\u6d41\u3001\u7f51\u7edc\u3001\u5206\u9875\u3001\u6d4b\u8bd5\u3001\u6027\u80fd\u4f18\u5316<\/td>\n\u590d\u523b\u5e76\u6269\u5c55\u4e00\u4e2a\u7ecf\u5178\u793a\u4f8b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

                                          \u672c\u8bfe\u5b9a\u4f4d： \u8fd9\u662f\u6574\u4e2a\u7cfb\u5217\u7684\u5730\u57fa\u3002\u7b2c 1 \u8bfe\u4e0d\u8ffd\u6c42\u8986\u76d6\u6240\u6709 API，\u800c\u662f\u5efa\u7acb\u6b63\u786e\u7684 Compose \u5fc3\u667a\u6a21\u578b\u3002\u540e\u9762\u6240\u6709\u8bfe\u7a0b\u2014\u2014\u5e03\u5c40\u3001\u72b6\u6001\u3001\u5bfc\u822a\u3001\u67b6\u6784\u3001\u6027\u80fd\u2014\u2014\u90fd\u5efa\u7acb\u5728\u672c\u8bfe\u7684\u6982\u5ff5\u4e4b\u4e0a\u3002\u5982\u679c\u672c\u8bfe\u7684\u6982\u5ff5\u6ca1\u5403\u900f，\u540e\u9762\u5f88\u5bb9\u6613\u5199\u6210\\”\u7528 Compose \u5199 View\\”\u3002\u4e00\u3001\u672c\u8bfe\u76ee\u6807
                                          \n\u5b66\u5b8c\u672c\u8bfe，\u4f60\u5e94\u8be5\u80fd\u591f：
                                          \n\u7406\u89e3\u547d\u4ee4\u5f0f UI \u4e0e\u58f0\u660e\u5f0f UI \u7684\u672c\u8d28\u533a\u522b\u3002\u7406\u89e3 Compose \u7684\u6838\u5fc3\u516c\u5f0f：UI f(state)<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8794,84,5754,1220,780],"topic":[],"class_list":["post-113983","post","type-post","status-publish","format-standard","hentry","category-server","tag-composer","tag-android","tag-android-jetpack","tag-android-studio","tag-ui"],"yoast_head":"\n\u3010Jetpack Compose\u58f0\u660e\u5f0fUI\u754c\u9762\u5f00\u53d1\u5b9e\u7528\u6280\u672f\u5b66\u4e0e\u7ec3\u3011\u7b2c 1 \u8bfe\uff1a\u4ece\u547d\u4ee4\u5f0f\u5230\u58f0\u660e\u5f0f\u2014\u2014\u73af\u5883\u642d\u5efa\u4e0e\u7b2c\u4e00\u4e2a Compose \u754c\u9762 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/113983.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Jetpack Compose\u58f0\u660e\u5f0fUI\u754c\u9762\u5f00\u53d1\u5b9e\u7528\u6280\u672f\u5b66\u4e0e\u7ec3\u3011\u7b2c 1 \u8bfe\uff1a\u4ece\u547d\u4ee4\u5f0f\u5230\u58f0\u660e\u5f0f\u2014\u2014\u73af\u5883\u642d\u5efa\u4e0e\u7b2c\u4e00\u4e2a Compose \u754c\u9762 - 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