{"id":203294,"date":"2023-08-10T07:49:44","date_gmt":"2023-08-09T23:49:44","guid":{"rendered":"https:\/\/www.idc.net\/help\/203294\/"},"modified":"2023-08-10T07:49:44","modified_gmt":"2023-08-09T23:49:44","slug":"%e4%bd%bf%e7%94%a8-kotlin-%e9%87%8d%e5%86%99-aosp-%e6%97%a5%e5%8e%86%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/203294\/","title":{"rendered":"\u4f7f\u7528 Kotlin \u91cd\u5199 AOSP \u65e5\u5386\u5e94\u7528"},"content":{"rendered":"<p>\u4e24\u5e74\u524d\uff0cAndroid \u5f00\u6e90\u9879\u76ee (AOSP) \u5e94\u7528\u56e2\u961f\u5f00\u59cb\u4f7f\u7528 Kotlin \u66ff\u4ee3 Java \u91cd\u6784 AOSP \u5e94\u7528\u3002\u4e4b\u6240\u4ee5\u91cd\u6784\u4e3b\u8981\u6709\u4e24\u4e2a\u539f\u56e0: \u4e00\u662f\u786e\u4fdd AOSP \u5e94\u7528\u80fd\u591f\u9075\u5faa Android \u6700\u4f73\u5b9e\u8df5\uff0c\u53e6\u5916\u5219\u662f\u63d0\u4f9b\u4f18\u5148\u4f7f\u7528 Kotlin \u8fdb\u884c\u5e94\u7528\u5f00\u53d1\u7684\u826f\u597d\u8303\u4f8b\u3002Kotlin \u4e4b\u6240\u4ee5\u5177\u6709\u5f3a\u5927\u7684\u5438\u5f15\u529b\uff0c\u539f\u56e0\u4e4b\u4e00\u662f\u5176\u7b80\u6d01\u7684\u8bed\u6cd5\uff0c\u5f88\u591a\u60c5\u51b5\u4e0b\u7528 Kotlin \u7f16\u5199\u7684\u4ee3\u7801\u5757\u7684\u4ee3\u7801\u6570\u91cf\u76f8\u6bd4\u4e8e\u529f\u80fd\u76f8\u540c\u7684 Java \u4ee3\u7801\u5757\u8981\u66f4\u5c11\u4e00\u4e9b\u3002\u6b64\u5916\uff0cKotlin \u8fd9\u79cd\u5177\u6709\u4e30\u5bcc\u8868\u73b0\u529b\u7684\u7f16\u7a0b\u8bed\u8a00\u8fd8\u5177\u6709\u5176\u4ed6\u5404\u79cd\u4f18\u70b9\uff0c\u4f8b\u5982:<\/p>\n<p style=\"text-align: center\"><span>[[424403]]<\/span><\/p>\n<ul>\n<li>\u7a7a\u5b89\u5168: \u8fd9\u4e00\u6982\u5ff5\u53ef\u4ee5\u8bf4\u662f\u6839\u690d\u4e8e Kotlin \u4e4b\u4e2d\uff0c\u4ece\u800c\u5e2e\u52a9\u907f\u514d\u7834\u574f\u6027\u7684\u7a7a\u6307\u9488\u5f02\u5e38;<\/li>\n<li>\u5e76\u53d1: \u6b63\u5982 Google I\/O 2019 \u4e2d\u5173\u4e8e Android \u7684\u63cf\u8ff0\uff0c\u7ed3\u6784\u5316\u5e76\u53d1 (structured concurrency) \u80fd\u591f\u5141\u8bb8\u4f7f\u7528\u534f\u7a0b\u7b80\u5316\u540e\u53f0\u7684\u4efb\u52a1\u7ba1\u7406;<\/li>\n<li>\u517c\u5bb9 Java: \u5c24\u5176\u662f\u5728\u8fd9\u6b21\u7684\u91cd\u6784\u9879\u76ee\u4e2d\uff0cKotlin \u4e0e Java \u8bed\u8a00\u7684\u517c\u5bb9\u6027\u80fd\u591f\u8ba9\u6211\u4eec\u4e00\u4e2a\u6587\u4ef6\u4e00\u4e2a\u6587\u4ef6\u5730\u8fdb\u884c Kotlin \u8f6c\u6362\u3002<\/li>\n<\/ul>\n<p>AOSP \u56e2\u961f\u5728\u53bb\u5e74\u590f\u5929\u53d1\u8868\u4e86\u4e00\u7bc7\u6587\u7ae0\uff0c\u8be6\u7ec6\u4ecb\u7ecd\u4e86 AOSP \u684c\u9762\u65f6\u949f\u5e94\u7528\u7684\u8f6c\u6362\u8fc7\u7a0b\u3002\u800c\u4eca\u5e74\uff0c\u6211\u4eec\u5c06 AOSP \u65e5\u5386\u5e94\u7528\u4ece Java \u8f6c\u6362\u6210\u4e86 Kotlin\u3002\u5728\u8fd9\u6b21\u8f6c\u6362\u4e4b\u524d\uff0c\u5e94\u7528\u7684\u4ee3\u7801\u884c\u6570\u8d85\u8fc7 18,000 \u884c\uff0c\u5728\u8f6c\u6362\u540e\u4ee3\u7801\u5e93\u51cf\u5c11\u4e86\u7ea6 300 \u884c\u3002\u5728\u8fd9\u6b21\u7684\u8f6c\u6362\u4e2d\uff0c\u6211\u4eec\u6cbf\u88ad\u4e86\u540c AOSP \u684c\u9762\u65f6\u949f\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u7c7b\u4f3c\u7684\u6280\u672f\uff0c\u5145\u5206\u5229\u7528\u4e86 Kotlin \u4e0e Java \u8bed\u8a00\u7684\u4e92\u64cd\u4f5c\u6027\uff0c\u5bf9\u4ee3\u7801\u6587\u4ef6\u4e00\u4e00\u8fdb\u884c\u4e86\u8f6c\u6362\uff0c\u5e76\u5728\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u72ec\u7acb\u7684\u6784\u5efa\u76ee\u6807\u5c06 Java \u4ee3\u7801\u6587\u4ef6\u66ff\u6362\u4e3a\u5bf9\u5e94\u7684 Kotlin \u4ee3\u7801\u6587\u4ef6\u3002\u56e0\u4e3a\u56e2\u961f\u4e2d\u6709\u4e24\u4e2a\u4eba\u5728\u8fdb\u884c\u6b64\u9879\u5de5\u4f5c\uff0c\u6240\u4ee5\u6211\u4eec\u5728 Android.bp \u6587\u4ef6\u4e2d\u4e3a\u6bcf\u4e2a\u4eba\u521b\u5efa\u4e86\u4e00\u4e2a exclude_srcs \u5c5e\u6027\uff0c\u8fd9\u6837\u4e24\u4e2a\u4eba\u5c31\u53ef\u4ee5\u5728\u51cf\u5c11\u4ee3\u7801\u5408\u5e76\u51b2\u7a81\u7684\u524d\u63d0\u4e0b\uff0c\u90fd\u80fd\u591f\u540c\u65f6\u8fdb\u884c\u91cd\u6784\u5e76\u63a8\u9001\u4ee3\u7801\u3002\u6b64\u5916\uff0c\u8fd9\u6837\u8fd8\u80fd\u5141\u8bb8\u6211\u4eec\u8fdb\u884c\u589e\u91cf\u6d4b\u8bd5\uff0c\u5feb\u901f\u5b9a\u4f4d\u9519\u8bef\u51fa\u73b0\u5728\u54ea\u4e9b\u6587\u4ef6\u3002<\/p>\n<p>\u5728\u8f6c\u6362\u4efb\u610f\u7ed9\u5b9a\u7684\u6587\u4ef6\u65f6\uff0c\u6211\u4eec\u4e00\u5f00\u59cb\u5148\u4f7f\u7528 Android Studio Kotlin \u63d2\u4ef6\u4e2d\u63d0\u4f9b\u7684\u4ece Java \u5230 Kotlin \u7684\u81ea\u52a8\u8f6c\u6362\u5de5\u5177\u3002\u867d\u7136\u8be5\u63d2\u4ef6\u6210\u529f\u5e2e\u52a9\u6211\u4eec\u8f6c\u6362\u4e86\u5927\u90e8\u4efd\u7684\u4ee3\u7801\uff0c\u4f46\u662f\u8fd8\u662f\u4f1a\u9047\u5230\u4e00\u4e9b\u95ee\u9898\uff0c\u9700\u8981\u5f00\u53d1\u8005\u624b\u52a8\u89e3\u51b3\u3002\u9700\u8981\u624b\u52a8\u66f4\u6539\u7684\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u4f1a\u5728\u672c\u6587\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u4e2d\u5217\u51fa\u3002<\/p>\n<p>\u5728\u5c06\u6bcf\u4e2a\u6587\u4ef6\u8f6c\u6362\u4e3a Kotlin \u4e4b\u540e\uff0c\u6211\u4eec\u624b\u52a8\u6d4b\u8bd5\u4e86\u65e5\u5386\u5e94\u7528\u7684 UI \u754c\u9762\uff0c\u8fd0\u884c\u4e86\u5355\u5143\u6d4b\u8bd5\uff0c\u5e76\u8fd0\u884c\u4e86 Compatibility Test Suite (CTS) \u7684\u5b50\u96c6\u6765\u8fdb\u884c\u529f\u80fd\u9a8c\u8bc1\uff0c\u4ee5\u786e\u4fdd\u4e0d\u9700\u8981\u518d\u8fdb\u884c\u4efb\u4f55\u7684\u56de\u5f52\u6d4b\u8bd5\u3002<\/p>\n<h2>\u81ea\u52a8\u8f6c\u6362\u4e4b\u540e\u7684\u6b65\u9aa4<\/h2>\n<p>\u4e0a\u9762\u63d0\u5230\uff0c\u5728\u4f7f\u7528\u81ea\u52a8\u8f6c\u6362\u5de5\u5177\u4e4b\u540e\uff0c\u6709\u4e00\u4e9b\u53cd\u590d\u51fa\u73b0\u7684\u95ee\u9898\u9700\u8981\u624b\u52a8\u5b9a\u4f4d\u89e3\u51b3\u3002\u5728 AOSP \u684c\u9762\u65f6\u949f\u6587\u7ae0\u4e2d\uff0c\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5176\u4e2d\u9047\u5230\u7684\u4e00\u4e9b\u95ee\u9898\u4ee5\u53ca\u89e3\u51b3\u65b9\u6cd5\u3002\u5982\u4e0b\u5217\u51fa\u4e86\u4e00\u4e9b\u5728\u8fdb\u884c AOSP \u65e5\u5386\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u9047\u5230\u7684\u95ee\u9898\u3002<\/p>\n<h3>\u7528 open \u5173\u952e\u8bcd\u6807\u8bb0\u7236\u7c7b<\/h3>\n<p>\u6211\u4eec\u9047\u5230\u7684\u95ee\u9898\u4e4b\u4e00\u662f Kotlin \u7236\u7c7b\u548c\u5b50\u7c7b\u4e4b\u95f4\u7684\u76f8\u4e92\u8c03\u7528\u3002\u5728 Kotlin \u4e2d\uff0c\u8981\u5c06\u4e00\u4e2a\u7c7b\u6807\u8bb0\u4e3a\u53ef\u7ee7\u627f\uff0c\u5fc5\u987b\u5f97\u5728\u7c7b\u7684\u58f0\u660e\u4e2d\u6dfb\u52a0 open \u5173\u952e\u5b57\uff0c\u5bf9\u4e8e\u7236\u7c7b\u4e2d\u88ab\u5b50\u7c7b\u8986\u76d6\u7684\u65b9\u6cd5\u4e5f\u8981\u8fd9\u6837\u505a\u3002\u4f46\u662f\u5728 Java \u4e2d\u7684\u7ee7\u627f\u662f\u4e0d\u9700\u8981\u4f7f\u7528\u5230 open \u5173\u952e\u5b57\u7684\u3002\u7531\u4e8e Kotlin \u548c Java \u80fd\u591f\u76f8\u4e92\u8c03\u7528\uff0c\u8fd9\u4e2a\u95ee\u9898\u76f4\u5230\u5927\u90e8\u5206\u4ee3\u7801\u6587\u4ef6\u8f6c\u6362\u5230\u4e86 Kotlin \u624d\u51fa\u73b0\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u58f0\u660e\u4e86\u4e00\u4e2a\u7ee7\u627f\u4e8e SimpleWeeksAdapter \u7684\u7c7b:<\/p>\n<pre>\n \n \n \n <ol>\n  \n  \n  \n  <li><span><span>class&nbsp;MonthByWeekAdapter(context:&nbsp;Context?,&nbsp;params:&nbsp;<\/span><\/span><\/li>\n  \n  \n  \n  <li><span>&nbsp;&nbsp;&nbsp;&nbsp;HashMap&lt;String?,&nbsp;<span>Int<\/span><span>?&gt;)&nbsp;:&nbsp;SimpleWeeksAdapter(context&nbsp;<\/span><span>as<\/span><span>&nbsp;Context,&nbsp;params)&nbsp;{\/\/\u65b9\u6cd5\u4f53}&nbsp;<\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n<p>\u7531\u4e8e\u4ee3\u7801\u6587\u4ef6\u7684\u8f6c\u6362\u8fc7\u7a0b\u662f\u4e00\u6b21\u4e00\u4e2a\u6587\u4ef6\u8fdb\u884c\u7684\uff0c\u5373\u4f7f\u662f\u5b8c\u5168\u5c06 SimpleWeeksAdapter.kt \u6587\u4ef6\u8f6c\u6362\u6210 Kotlin\uff0c\u4e5f\u4e0d\u4f1a\u5728\u5176\u7c7b\u7684\u58f0\u660e\u4e2d\u51fa\u73b0 open \u5173\u952e\u8bcd\uff0c\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4\u4e00\u4e2a\u9519\u8bef\u3002\u6240\u4ee5\u4e4b\u540e\u9700\u8981\u624b\u52a8\u8fdb\u884c open \u5173\u952e\u8bcd\u7684\u6dfb\u52a0\uff0c\u4ee5\u4fbf\u8ba9 SimpleWeeksAdapter \u7c7b\u53ef\u4ee5\u88ab\u7ee7\u627f\u3002\u8fd9\u4e2a\u7279\u6b8a\u7684\u7c7b\u58f0\u660e\u5982\u4e0b\u6240\u793a:<\/p>\n<pre>\n \n \n \n <ol>\n  \n  \n  \n  <li><span><span>open<\/span><span>&nbsp;class&nbsp;SimpleWeeksAdapter(context:&nbsp;Context,&nbsp;params:&nbsp;HashMap?)&nbsp;{\/\/\u65b9\u6cd5\u4f53}&nbsp;<\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n<h3>override \u4fee\u9970\u7b26<\/h3>\n<p>\u540c\u6837\u5730\uff0c\u5b50\u7c7b\u4e2d\u8986\u76d6\u7236\u7c7b\u7684\u65b9\u6cd5\u4e5f\u5fc5\u987b\u4f7f\u7528 override \u4fee\u9970\u7b26\u6765\u8fdb\u884c\u6807\u8bb0\u3002\u5728 Java \u4e2d\uff0c\u8fd9\u662f\u901a\u8fc7 @Override \u6ce8\u89e3\u6765\u5b9e\u73b0\u7684\u3002\u7136\u800c\uff0c\u867d\u7136\u5728 Java \u4e2d\u6709\u76f8\u5e94\u7684\u6ce8\u89e3\u5b9e\u73b0\u7248\u672c\uff0c\u4f46\u662f\u81ea\u52a8\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u5e76\u6ca1\u6709\u4e3a Kotlin \u65b9\u6cd5\u58f0\u660e\u4e2d\u6dfb\u52a0 override \u4fee\u9970\u7b26\u3002\u89e3\u51b3\u7684\u529e\u6cd5\u662f\u5728\u6240\u6709\u9002\u5f53\u7684\u5730\u65b9\u624b\u52a8\u6dfb\u52a0 override \u4fee\u9970\u7b26\u3002<\/p>\n<h3>\u8986\u5199\u7236\u7c7b\u4e2d\u7684\u5c5e\u6027<\/h3>\n<p>\u5728\u91cd\u6784\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u8fd8\u9047\u5230\u4e86\u4e00\u4e2a\u5c5e\u6027\u8986\u5199\u7684\u5f02\u5e38\u95ee\u9898\uff0c\u5f53\u4e00\u4e2a\u5b50\u7c7b\u58f0\u660e\u4e86\u4e00\u4e2a\u53d8\u91cf\uff0c\u800c\u5728\u7236\u7c7b\u4e2d\u5b58\u5728\u4e00\u4e2a\u975e\u79c1\u6709\u7684\u540c\u540d\u53d8\u91cf\u65f6\uff0c\u6211\u4eec\u9700\u8981\u6dfb\u52a0\u4e00\u4e2a override \u4fee\u9970\u7b26\u3002\u7136\u800c\uff0c\u5373\u4f7f\u5b50\u7c7b\u7684\u53d8\u91cf\u540c\u7236\u7c7b\u53d8\u91cf\u7684\u7c7b\u578b\u4e0d\u540c\uff0c\u4e5f\u4ecd\u7136\u8981\u6dfb\u52a0 override \u4fee\u9970\u7b26\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6dfb\u52a0 override \u4ecd\u4e0d\u80fd\u89e3\u51b3\u95ee\u9898\uff0c\u5c24\u5176\u662f\u5f53\u5b50\u7c7b\u7684\u7c7b\u578b\u5b8c\u5168\u4e0d\u540c\u7684\u65f6\u5019\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5982\u679c\u7c7b\u578b\u4e0d\u5339\u914d\uff0c\u5728\u5b50\u7c7b\u7684\u53d8\u91cf\u524d\u6dfb\u52a0 override \u4fee\u9970\u7b26\uff0c\u5e76\u5728\u7236\u7c7b\u7684\u53d8\u91cf\u524d\u6dfb\u52a0 open \u5173\u952e\u5b57\uff0c\u4f1a\u5bfc\u81f4\u4e00\u4e2a\u9519\u8bef:<\/p>\n<pre>\n \n \n \n <ol>\n  \n  \n  \n  <li><span><span>type&nbsp;<\/span><span>of<\/span><span>&nbsp;*property&nbsp;<\/span><span>name<\/span><span>*&nbsp;doesn\u2019t&nbsp;match&nbsp;the&nbsp;type&nbsp;<\/span><span>of<\/span><span>&nbsp;the&nbsp;overridden&nbsp;var-property&nbsp;<\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n<p>\u8fd9\u4e2a\u62a5\u9519\u5f88\u8ba9\u4eba\u7591\u60d1\uff0c\u56e0\u4e3a\u5728 Java \u4e2d\uff0c\u4ee5\u4e0b\u4ee3\u7801\u53ef\u4ee5\u6b63\u5e38\u7f16\u8bd1:<\/p>\n<pre>\n \n \n \n <ol>\n  \n  \n  \n  <li><span><span>public<\/span><span>&nbsp;class&nbsp;Parent&nbsp;{&nbsp;<\/span><\/span><\/li>\n  \n  \n  \n  <li><span>&nbsp;&nbsp;&nbsp;&nbsp;<span>int<\/span><span>&nbsp;num&nbsp;=&nbsp;0;&nbsp;<\/span><\/span><\/li>\n  \n  \n  \n  <li><span>}&nbsp;<\/span><\/li>\n  \n  \n  \n  <li><span>&nbsp;<\/span><\/li>\n  \n  \n  \n  <li><span>class&nbsp;Child&nbsp;extends&nbsp;Parent&nbsp;{&nbsp;<\/span><\/li>\n  \n  \n  \n  <li><span>&nbsp;&nbsp;&nbsp;&nbsp;String&nbsp;num&nbsp;=&nbsp;<span>\"num\"<\/span><span>;&nbsp;<\/span><\/span><\/li>\n  \n  \n  \n  <li><span>}&nbsp;<\/span><\/li>\n \n \n \n <\/ol><\/pre>\n<p>\u800c\u5728 Kotlin \u4e2d\u76f8\u5e94\u7684\u4ee3\u7801\u5c31\u4f1a\u62a5\u4e0a\u9762\u63d0\u5230\u7684\u9519\u8bef:<\/p>\n<pre>\n \n \n \n <ol>\n  \n  \n  \n  <li><span><span>class&nbsp;Parent&nbsp;{&nbsp;<\/span><\/span><\/li>\n  \n  \n  \n  <li><span>&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;num:&nbsp;<span>Int<\/span><span>&nbsp;=&nbsp;0&nbsp;<\/span><\/span><\/li>\n  \n  \n  \n  <li><span>}&nbsp;<\/span><\/li>\n  \n  \n  \n  <li><span>&nbsp;<\/span><\/li>\n  \n  \n  \n  <li><span>class&nbsp;Child&nbsp;:&nbsp;Parent()&nbsp;{&nbsp;<\/span><\/li>\n  \n  \n  \n  <li><span>&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;num:&nbsp;String&nbsp;=&nbsp;<span>\"num\"<\/span><span>&nbsp;<\/span><\/span><\/li>\n  \n  \n  \n  <li><span>}&nbsp;<\/span><\/li>\n \n \n \n <\/ol><\/pre>\n<p>\u8fd9\u4e2a\u95ee\u9898\u5f88\u6709\u610f\u601d\uff0c\u76ee\u524d\u6211\u4eec\u901a\u8fc7\u5728\u5b50\u7c7b\u4e2d\u5bf9\u53d8\u91cf\u91cd\u547d\u540d\u6765\u89c4\u907f\u4e86\u8fd9\u4e2a\u51b2\u7a81\u3002\u4e0a\u9762\u7684 Java \u4ee3\u7801\u4f1a\u88ab Android Studio \u76ee\u524d\u63d0\u4f9b\u7684\u4ee3\u7801\u8f6c\u6362\u5668\u8f6c\u6362\u4e3a\u6709\u95ee\u9898\u7684 Kotlin \u4ee3\u7801\uff0c\u8fd9\u751a\u81f3\u88ab\u62a5\u544a\u4e3a\u662f\u4e00\u4e2a bug \u4e86\u3002<\/p>\n<h3>import \u8bed\u53e5<\/h3>\n<p>\u5728\u6211\u4eec\u8f6c\u6362\u7684\u6240\u6709\u6587\u4ef6\u4e2d\uff0c\u81ea\u52a8\u8f6c\u6362\u5de5\u5177\u90fd\u503e\u5411\u4e8e\u5c06 Java \u4ee3\u7801\u4e2d\u7684\u6240\u6709 import \u8bed\u53e5\u622a\u65ad\u4e3a Kotlin \u6587\u4ef6\u4e2d\u7684\u7b2c\u4e00\u884c\u3002\u6700\u5f00\u59cb\u8fd9\u5bfc\u81f4\u4e86\u4e00\u4e9b\u5f88\u8ba9\u4eba\u6293\u72c2\u7684\u9519\u8bef\uff0c\u7f16\u8bd1\u5668\u4f1a\u5728\u6574\u4e2a\u4ee3\u7801\u4e2d\u62a5 \"unknown references\" \u7684\u9519\u8bef\u3002\u5728\u610f\u8bc6\u5230\u8fd9\u4e2a\u95ee\u9898\u540e\uff0c\u6211\u4eec\u5f00\u59cb\u624b\u52a8\u5730\u5c06 Java \u4e2d\u7684 import \u8bed\u53e5\u7c98\u8d34\u5230 Kotlin \u4ee3\u7801\u6587\u4ef6\u4e2d\uff0c\u5e76\u5355\u72ec\u5bf9\u5176\u8fdb\u884c\u8f6c\u6362\u3002<\/p>\n<h3>\u66b4\u9732\u6210\u5458\u53d8\u91cf<\/h3>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cKotlin \u4f1a\u81ea\u52a8\u5730\u4e3a\u7c7b\u4e2d\u7684\u5b9e\u4f8b\u53d8\u91cf\u751f\u6210 getter \u548c setter \u65b9\u6cd5\u3002\u7136\u800c\uff0c\u6709\u4e9b\u65f6\u5019\u6211\u4eec\u5e0c\u671b\u4e00\u4e2a\u53d8\u91cf\u4ec5\u4ec5\u53ea\u662f\u4e00\u4e2a\u7b80\u5355\u7684 Java \u6210\u5458\u53d8\u91cf\uff0c\u8fd9\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 @JvmField \u6ce8\u89e3\u6765\u5b9e\u73b0\u3002<\/p>\n<p>@JvmField \u6ce8\u89e3\u7684\u4f5c\u7528\u662f \"\u6307\u793a Kotlin \u7f16\u8bd1\u5668\u4e0d\u8981\u4e3a\u8fd9\u4e2a\u5c5e\u6027\u751f\u6210 getter \u548c setter \u65b9\u6cd5\uff0c\u5e76\u5c06\u5176\u4f5c\u4e3a\u4e00\u4e2a\u6210\u5458\u53d8\u91cf\u5141\u8bb8\u5176\u88ab\u516c\u5f00\u8bbf\u95ee\"\u3002\u8fd9\u4e2a\u6ce8\u89e3\u5728 CalendarData \u7c7b\u4e2d\u7279\u522b\u6709\u7528\uff0c\u5b83\u5305\u542b\u4e86\u4e24\u4e2a static final \u53d8\u91cf\u3002\u901a\u8fc7\u5bf9\u4f7f\u7528 val \u58f0\u660e\u7684\u53ea\u8bfb\u53d8\u91cf\u4f7f\u7528 @JvmField \u6ce8\u89e3\uff0c\u6211\u4eec\u786e\u4fdd\u4e86\u8fd9\u4e9b\u53d8\u91cf\u53ef\u4ee5\u4f5c\u4e3a\u6210\u5458\u53d8\u91cf\u88ab\u5176\u4ed6\u7c7b\u8bbf\u95ee\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86 Java \u548c Kotlin \u4e4b\u95f4\u7684\u517c\u5bb9\u6027\u3002<\/p>\n<h3>\u5bf9\u8c61\u4e2d\u7684\u9759\u6001\u65b9\u6cd5<\/h3>\n<p>\u5728 Kotlin \u5bf9\u8c61\u4e2d\u5b9a\u4e49\u7684\u51fd\u6570\u5fc5\u987b\u4f7f\u7528 @JvmStatic \u8fdb\u884c\u6807\u8bb0\uff0c\u4ee5\u5141\u8bb8\u5728 Java \u4ee3\u7801\u4e2d\u901a\u8fc7\u65b9\u6cd5\u540d\uff0c\u800c\u975e\u5b9e\u4f8b\u5316\u6765\u5bf9\u5b83\u4eec\u8fdb\u884c\u8c03\u7528\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u8fd9\u4e2a\u6ce8\u89e3\u4f7f\u5176\u5177\u6709\u4e86\u7c7b\u4f3c Java \u7684\u65b9\u6cd5\u884c\u4e3a\uff0c\u5373\u80fd\u591f\u901a\u8fc7\u7c7b\u540d\u8c03\u7528\u65b9\u6cd5\u3002\u6839\u636e Kotlin \u7684\u6587\u6863\uff0c\"\u7f16\u8bd1\u5668\u4f1a\u4e3a\u5bf9\u8c61\u7684\u5916\u90e8\u7c7b\u751f\u6210\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\uff0c\u800c\u5bf9\u4e8e\u5bf9\u8c61\u672c\u8eab\u4f1a\u751f\u6210\u4e00\u4e2a\u5b9e\u4f8b\u65b9\u6cd5\u3002\"\u6211\u4eec\u5728 Utils \u6587\u4ef6\u4e2d\u9047\u5230\u4e86\u8fd9\u4e2a\u95ee\u9898\uff0c\u5f53\u5b8c\u6210\u8f6c\u6362\u540e\uff0cJava \u7c7b\u5c31\u53d8\u6210\u4e86 Kotlin \u5bf9\u8c61\u3002\u968f\u540e\uff0c\u6240\u6709\u5728\u5bf9\u8c61\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u90fd\u5fc5\u987b\u4f7f\u7528 @JvmStatic \u6807\u8bb0\uff0c\u8fd9\u6837\u5c31\u5141\u8bb8\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u4f7f\u7528 Utils.method() \u8fd9\u6837\u7684\u8bed\u6cd5\u6765\u8fdb\u884c\u8c03\u7528\u3002\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u5728\u7c7b\u540d\u548c\u65b9\u6cd5\u540d\u4e4b\u95f4\u4f7f\u7528 .INSTANCE (\u5373 Utils.INSTANCE.method()) \u4e5f\u662f\u4e00\u79cd\u9009\u62e9\uff0c\u4f46\u662f\u8fd9\u4e0d\u592a\u7b26\u5408\u5e38\u89c1\u7684 Java \u8bed\u6cd5\uff0c\u9700\u8981\u6539\u53d8\u6240\u6709\u5bf9 Java \u9759\u6001\u65b9\u6cd5\u7684\u8c03\u7528\u3002<\/p>\n<h2>\u6027\u80fd\u8bc4\u4f30\u5206\u6790<\/h2>\n<p>\u6240\u6709\u7684\u57fa\u51c6\u6d4b\u8bd5\u90fd\u662f\u5728\u4e00\u53f0 96 \u6838\u3001176 GiB \u5185\u5b58\u7684\u673a\u5668\u4e0a\u8fdb\u884c\u7684\u3002\u672c\u9879\u76ee\u4e2d\u5206\u6790\u7528\u5230\u7684\u4e3b\u8981\u6307\u6807\u6709\u6240\u51cf\u5c11\u7684\u4ee3\u7801\u884c\u6570\u3001\u76ee\u6807 APK \u7684\u6587\u4ef6\u5927\u5c0f\u3001\u6784\u5efa\u65f6\u95f4\u548c\u9996\u5c4f\u4ece\u542f\u52a8\u5230\u663e\u793a\u7684\u65f6\u95f4\u3002\u5728\u5bf9\u4e0a\u8ff0\u6bcf\u4e2a\u56e0\u7d20\u8fdb\u884c\u5206\u6790\u7684\u540c\u65f6\uff0c\u6211\u4eec\u8fd8\u6536\u96c6\u4e86\u6bcf\u4e2a\u53c2\u6570\u7684\u6570\u636e\u5e76\u4ee5\u8868\u683c\u7684\u65b9\u5f0f\u8fdb\u884c\u4e86\u5c55\u793a\u3002<\/p>\n<h3>\u51cf\u5c11\u7684\u4ee3\u7801\u884c\u6570<\/h3>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\">\n<p>&nbsp;<\/p>\n<p>\u4ece Java \u5b8c\u5168\u8f6c\u6362\u5230 Kotlin \u540e\uff0c\u4ee3\u7801\u884c\u6570\u4ece 18,004 \u51cf\u5c11\u5230\u4e86 17,729\u3002\u8fd9\u6bd4\u539f\u6765\u7684 Java \u4ee3\u7801\u91cf\u51cf\u5c11\u4e86\u5927\u7ea6 1.5%\u3002\u867d\u7136\u51cf\u5c11\u7684\u4ee3\u7801\u91cf\u5e76\u4e0d\u53ef\u89c2\uff0c\u4f46\u5bf9\u4e8e\u4e00\u4e9b\u5927\u578b\u5e94\u7528\u6765\u8bf4\uff0c\u8fd9\u79cd\u8f6c\u6362\u5bf9\u4e8e\u51cf\u5c11\u4ee3\u7801\u884c\u6570\u7684\u6548\u679c\u53ef\u80fd\u66f4\u4e3a\u663e\u8457\uff0c\u53ef\u53c2\u9605 AOSP \u684c\u9762\u65f6\u949f\u6587\u4e2d\u6240\u4e3e\u7684\u4f8b\u5b50\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>\u76ee\u6807 APK \u5927\u5c0f<\/h3>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\">\n<p>\u4f7f\u7528 Kotlin \u7f16\u5199\u7684\u5e94\u7528 APK \u5927\u5c0f\u662f 2.7 MB\uff0c\u800c\u4f7f\u7528 Java \u7f16\u5199\u7684\u5e94\u7528 APK \u5927\u5c0f\u662f 2.6 MB\u3002\u53ef\u4ee5\u8bf4\u8fd9\u4e2a\u5dee\u5f02\u57fa\u672c\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u4e86\uff0c\u7531\u4e8e\u5305\u542b\u4e86\u4e00\u4e9b\u989d\u5916\u7684 Kotlin \u5e93\uff0c\u6240\u4ee5 APK \u4f53\u79ef\u4e0a\u7684\u589e\u52a0\uff0c\u5b9e\u9645\u4e0a\u662f\u53ef\u4ee5\u9884\u671f\u7684\u3002\u8fd9\u79cd\u5927\u5c0f\u7684\u589e\u52a0\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 Proguard \u6216 R8 \u6765\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n<h4>\u7f16\u8bd1\u65f6\u95f4<\/h4>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\">\n<p>Kotlin \u548c Java \u5e94\u7528\u7684\u6784\u5efa\u65f6\u95f4\u662f\u901a\u8fc7\u53d6 10 \u6b21\u4ece\u96f6\u8fdb\u884c\u5b8c\u6574\u6784\u5efa\u7684\u65f6\u95f4\u7684\u5e73\u5747\u503c\u6765\u8ba1\u7b97\u7684 (\u4e0d\u5305\u542b\u5f02\u5e38\u503c)\uff0cKotlin \u5e94\u7528\u7684\u5e73\u5747\u6784\u5efa\u65f6\u95f4\u4e3a 13 \u5206 27 \u79d2\uff0c\u800c Java \u5e94\u7528\u7684\u5e73\u5747\u6784\u5efa\u65f6\u95f4\u4e3a 12 \u5206 6 \u79d2\u3002\u636e\u4e00\u4e9b\u8d44\u6599 (\u5982 \"Java \u548c Kotlin \u7684\u533a\u522b\" \u4ee5\u53ca \"Kotlin \u548c Java \u5728\u7f16\u8bd1\u65f6\u95f4\u4e0a\u7684\u5bf9\u6bd4\") \u663e\u793a\uff0cKotlin \u7684\u7f16\u8bd1\u65f6\u95f4\u4e8b\u5b9e\u4e0a\u6bd4 Java \u8981\u66f4\u8017\u65f6\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u4ece\u96f6\u5f00\u59cb\u7684\u6784\u5efa\u3002\u4e00\u4e9b\u5206\u6790\u65ad\u8a00\uff0cJava \u7684\u7f16\u8bd1\u901f\u5ea6\u4f1a\u5feb 10-15%\uff0c\u53c8\u6709\u4e00\u4e9b\u5206\u6790\u79f0\u8fd9\u4e00\u6570\u636e\u4e3a 15-20%\u3002\u62ff\u6211\u4eec\u7684\u4f8b\u5b50\u8fdb\u884c\u4ece\u96f6\u5f00\u59cb\u5b8c\u6574\u6784\u5efa\u6240\u82b1\u8d39\u7684\u65f6\u95f4\u6765\u8bf4\uff0cJava \u7684\u7f16\u8bd1\u901f\u5ea6\u6bd4 Kotlin \u5feb 11.2%\uff0c\u5c3d\u7ba1\u8fd9\u4e2a\u5fae\u5c0f\u7684\u5dee\u5f02\u5e76\u4e0d\u5728\u4e0a\u8ff0\u8303\u56f4\u5185\uff0c\u4f46\u8fd9\u6709\u53ef\u80fd\u662f\u56e0\u4e3a AOSP \u65e5\u5386\u662f\u4e00\u4e2a\u76f8\u5bf9\u8f83\u5c0f\u7684\u5e94\u7528\uff0c\u4ec5\u6709 43 \u4e2a\u7c7b\u3002\u5c3d\u7ba1\u4ece\u96f6\u5f00\u59cb\u7684\u5b8c\u6574\u6784\u5efa\u6bd4\u8f83\u6162\uff0c\u4f46\u662f Kotlin \u4ecd\u7136\u5728\u5176\u4ed6\u65b9\u9762\u5360\u6709\u4f18\u52bf\uff0c\u8fd9\u4e9b\u4f18\u52bf\u66f4\u5e94\u8be5\u88ab\u8003\u8651\u5230\u3002\u4f8b\u5982\uff0cKotlin \u76f8\u5bf9\u4e8e Java\uff0c\u66f4\u7b80\u6d01\u7684\u8bed\u6cd5\u901a\u5e38\u53ef\u4ee5\u4fdd\u8bc1\u8f83\u5c11\u7684\u4ee3\u7801\u91cf\uff0c\u8fd9\u4f7f\u5f97 Kotlin \u4ee3\u7801\u5e93\u66f4\u6613\u7ef4\u62a4\u3002\u6b64\u5916\uff0c\u7531\u4e8e Kotlin \u662f\u4e00\u79cd\u66f4\u4e3a\u5b89\u5168\u6709\u6548\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba4\u4e3a\u5b8c\u6574\u6784\u5efa\u65f6\u95f4\u8f83\u6162\u7684\u95ee\u9898\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u3002<\/p>\n<h3>\u9996\u5c4f\u663e\u793a\u7684\u65f6\u95f4<\/h3>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\">\n<p>\u6211\u4eec\u4f7f\u7528\u4e86\u8fd9\u79cd\u65b9\u6cd5\u6765\u6d4b\u8bd5\u5e94\u7528\u4ece\u542f\u52a8\u5230\u5b8c\u5168\u663e\u793a\u9996\u5c4f\u6240\u9700\u8981\u7684\u65f6\u95f4\uff0c\u7ecf\u8fc7 10 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