{"id":266876,"date":"2024-05-15T17:01:15","date_gmt":"2024-05-15T09:01:15","guid":{"rendered":""},"modified":"2024-05-15T17:01:22","modified_gmt":"2024-05-15T09:01:22","slug":"android-%e7%a8%8b%e5%ba%8f%e4%bb%a3%e7%a0%81%e6%80%8e%e4%b9%88%e8%87%aa%e5%ae%9a%e4%b9%89-view-%e5%ae%9e%e7%8e%b0%e7%ae%80%e7%ba%a6%e9%a3%8e%e6%ad%8c%e8%af%8d%e6%8e%a7%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/266876.html","title":{"rendered":"Android \u7a0b\u5e8f\u4ee3\u7801\u600e\u4e48\u81ea\u5b9a\u4e49 View \u5b9e\u73b0\u7b80\u7ea6\u98ce\u6b4c\u8bcd\u63a7\u4ef6"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27131817\/5e6e5ffa-6e32-4c70-b4d6-146783498fa1.webp\" alt=\"Android \u7a0b\u5e8f\u4ee3\u7801\u600e\u4e48\u81ea\u5b9a\u4e49 View \u5b9e\u73b0\u7b80\u7ea6\u98ce\u6b4c\u8bcd\u63a7\u4ef6\" \/><\/p>\n<p><p>\u81ea\u5b9a\u4e49Android View\u6765\u5b9e\u73b0\u7b80\u7ea6\u98ce\u683c\u7684\u6b4c\u8bcd\u63a7\u4ef6\u9700\u8981\u7ecf\u5386\u4ece\u57fa\u7840View\u7ed8\u5236\u5230\u590d\u6742\u7684\u6ed1\u52a8\u5904\u7406\u3001\u6b4c\u8bcd\u540c\u6b65\u7b49\u6b65\u9aa4\u3002<strong>\u4e3b\u8981\u5305\u62ec\uff1a\u5b9a\u4e49\u81ea\u5b9a\u4e49View\u57fa\u7840\u5c5e\u6027\u3001\u5b9e\u73b0\u6b4c\u8bcd\u7ed8\u5236\u3001\u6b4c\u8bcd\u6eda\u52a8\u5904\u7406\u3001\u4ee5\u53ca\u6b4c\u8bcd\u4e0e\u97f3\u4e50\u540c\u6b65<\/strong>\u3002\u7279\u522b\u5730\uff0c\u5728\u5b9e\u73b0\u6b4c\u8bcd\u7ed8\u5236\u65b9\u9762\uff0c\u6211\u4eec\u9700\u5173\u6ce8\u4e8e\u6587\u672c\u7684\u6d4b\u91cf\u548c\u7ed8\u5236\uff0c\u786e\u4fdd\u6b4c\u8bcd\u53ef\u4ee5\u6309\u7167\u8bbe\u8ba1\u8981\u6c42\u5448\u73b0\u5728\u5c4f\u5e55\u4e0a\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u5b9a\u4e49\u81ea\u5b9a\u4e49VIEW\u7684\u57fa\u7840\u5c5e\u6027<\/h3>\n<\/p>\n<p><p>\u5728\u81ea\u5b9a\u4e49View\u5f00\u59cb\u4e4b\u524d\uff0c\u5e94\u8be5\u5148\u5b9a\u4e49\u5176\u57fa\u672c\u7684\u5c5e\u6027\uff0c\u6bd4\u5982\u6b4c\u8bcd\u7684\u5b57\u4f53\u5927\u5c0f\u3001\u989c\u8272\u3001\u9ad8\u4eae\u989c\u8272\u7b49\u3002\u8fd9\u4e9b\u5c5e\u6027\u901a\u5e38\u5728View\u7684\u6784\u9020\u65b9\u6cd5\u4e2d\u521d\u59cb\u5316\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u5c5e\u6027\uff08\u5728XML\u91cc\u5b9a\u4e49\uff09\u8ba9\u7528\u6237\u5728\u5e03\u5c40\u6587\u4ef6\u4e2d\u8bbe\u5b9a\u3002<\/p>\n<\/p>\n<ul>\n<li><strong>\u521b\u5efa\u81ea\u5b9a\u4e49\u5c5e\u6027<\/strong>\uff1a\u5728res\/values\/attrs.xml\u6587\u4ef6\u4e2d\u5b9a\u4e49\u81ea\u5b9a\u4e49View\u7684\u5c5e\u6027\u3002\u6bd4\u5982\u6b4c\u8bcd\u7684\u989c\u8272\u3001\u9ad8\u4eae\u6b4c\u8bcd\u7684\u989c\u8272\u3001\u6b4c\u8bcd\u5b57\u4f53\u7684\u5927\u5c0f\u7b49\u3002<\/li>\n<li><strong>\u5728View\u6784\u9020\u65b9\u6cd5\u4e2d\u83b7\u53d6\u81ea\u5b9a\u4e49\u5c5e\u6027\u7684\u503c<\/strong>\uff1a\u901a\u8fc7TypedArray\u83b7\u53d6\uff0c\u5728\u6784\u9020\u65b9\u6cd5\u7ed3\u675f\u524d\u8bb0\u5f97\u8c03\u7528<code>recycle()<\/code>\u65b9\u6cd5\u56de\u6536TypedArray\u3002<\/li>\n<\/ul>\n<p><h3>\u4e8c\u3001\u5b9e\u73b0\u6b4c\u8bcd\u7ed8\u5236<\/h3>\n<\/p>\n<p><p>\u6b4c\u8bcd\u7684\u7ed8\u5236\u662f\u81ea\u5b9a\u4e49View\u7684\u6838\u5fc3\u3002\u4e3b\u8981\u8fc7\u7a0b\u5305\u62ec\u6d4b\u91cf\u6587\u672c\u3001\u5b9a\u4f4d\u6587\u672c\u548c\u5b9e\u9645\u7ed8\u5236\u6587\u672c\u3002<\/p>\n<\/p>\n<ul>\n<li><strong>\u6d4b\u91cf\u6587\u672c<\/strong>\uff1a\u4f7f\u7528P<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>nt\u5bf9\u8c61\u7684<code>measureText()<\/code>\u65b9\u6cd5\u6765\u6d4b\u91cf\u6587\u672c\u5bbd\u5ea6\uff0c<code>FontMetrics<\/code>\u6765\u83b7\u53d6\u6587\u672c\u7684\u9ad8\u5ea6\u4fe1\u606f\uff0c\u786e\u4fdd\u6587\u672c\u80fd\u5728\u9884\u5b9a\u7684\u533a\u57df\u5185\u6b63\u786e\u7ed8\u5236\u3002<\/li>\n<li><strong>\u7ed8\u5236\u6587\u672c<\/strong>\uff1a\u8c03\u7528Canvas\u7684<code>drawText()<\/code>\u65b9\u6cd5\u8fdb\u884c\u6587\u672c\u7684\u7ed8\u5236\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6b4c\u8bcd\u63a7\u4ef6\u4f1a\u663e\u793a\u591a\u884c\u6b4c\u8bcd\uff0c\u53ef\u4ee5\u901a\u8fc7\u8ba1\u7b97\u6bcf\u884c\u6b4c\u8bcd\u7684Y\u5750\u6807\u6765\u786e\u4fdd\u6b4c\u8bcd\u5782\u76f4\u5c45\u4e2d\u6216\u6309\u7167\u4e00\u5b9a\u7684\u5e03\u5c40\u663e\u793a\u3002<\/li>\n<\/ul>\n<p><h3>\u4e09\u3001\u6b4c\u8bcd\u6eda\u52a8\u5904\u7406<\/h3>\n<\/p>\n<p><p>\u4e3a\u4e86\u5b9e\u73b0\u6b4c\u8bcd\u7684\u6ed1\u52a8\u6548\u679c\uff0c\u9700\u8981\u5728\u81ea\u5b9a\u4e49View\u4e2d\u5904\u7406\u89e6\u6478\u4e8b\u4ef6\uff0c\u5e76\u8ba1\u7b97\u6ed1\u52a8\u7684\u8ddd\u79bb\u3002<\/p>\n<\/p>\n<ul>\n<li><strong>\u5904\u7406\u89e6\u6478\u4e8b\u4ef6<\/strong>\uff1a\u91cd\u5199<code>onTouchEvent()<\/code>\u65b9\u6cd5\u6765\u5904\u7406\u7528\u6237\u7684\u6ed1\u52a8\u64cd\u4f5c\u3002\u4f7f\u7528<code>MotionEvent<\/code>\u5bf9\u8c61\u68c0\u6d4b\u7528\u6237\u7684\u52a8\u4f5c\uff08\u5982\u6309\u4e0b\u3001\u79fb\u52a8\u3001\u62ac\u8d77\uff09\u5e76\u76f8\u5e94\u5730\u66f4\u65b0\u754c\u9762\u3002<\/li>\n<li><strong>\u8ba1\u7b97\u6ed1\u52a8\u8ddd\u79bb<\/strong>\uff1a\u6839\u636e\u7528\u6237\u7684\u6ed1\u52a8\u52a8\u4f5c\uff0c\u8ba1\u7b97\u51fa\u9700\u8981\u6ed1\u52a8\u7684\u8ddd\u79bb\uff0c\u5e76\u5728\u7ed8\u5236\u6b4c\u8bcd\u65f6\u8003\u8651\u8fd9\u4e2a\u6ed1\u52a8\u504f\u79fb\u91cf\uff0c\u901a\u8fc7\u8c03\u7528<code>invalidate()<\/code>\u65b9\u6cd5\u91cd\u7ed8View\uff0c\u5b9e\u73b0\u6eda\u52a8\u6548\u679c\u3002<\/li>\n<\/ul>\n<p><h3>\u56db\u3001\u6b4c\u8bcd\u4e0e\u97f3\u4e50\u540c\u6b65<\/h3>\n<\/p>\n<p><p>\u5b9e\u73b0\u6b4c\u8bcd\u4e0e\u97f3\u4e50\u540c\u6b65\u7684\u5173\u952e\u5728\u4e8e\u6b4c\u8bcd\u65f6\u95f4\u6807\u7b7e\u7684\u89e3\u6790\u548c\u4f7f\u7528\u3002\u901a\u5e38\uff0c\u6b4c\u8bcd\u6587\u4ef6\u4f1a\u5305\u542b\u6bcf\u884c\u6b4c\u8bcd\u7684\u65f6\u95f4\u6807\u7b7e\u3002<\/p>\n<\/p>\n<ul>\n<li><strong>\u89e3\u6790\u6b4c\u8bcd\u6587\u4ef6<\/strong>\uff1a\u81ea\u5b9a\u4e49View\u9700\u8981\u89e3\u6790\u6b4c\u8bcd\u6587\u4ef6\uff08\u901a\u5e38\u662fLRC\u683c\u5f0f\uff09\uff0c\u628a\u65f6\u95f4\u6807\u7b7e\u548c\u5bf9\u5e94\u7684\u6b4c\u8bcd\u884c\u5173\u8054\u8d77\u6765\uff0c\u5b58\u50a8\u5728\u4e00\u4e2a\u5408\u9002\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff08\u4f8b\u5982ArrayList\uff09\u3002<\/li>\n<li><strong>\u540c\u6b65\u5c55\u793a\u6b4c\u8bcd<\/strong>\uff1a\u4f9d\u636e\u97f3\u4e50\u64ad\u653e\u5668\u63d0\u4f9b\u7684\u5f53\u524d\u64ad\u653e\u65f6\u95f4\uff0c\u627e\u5230\u5e94\u8be5\u9ad8\u4eae\u663e\u793a\u7684\u6b4c\u8bcd\u884c\uff0c\u5e76\u5728\u6bcf\u6b21\u7ed8\u5236\u65f6\uff0c\u5c06\u8be5\u884c\u6b4c\u8bcd\u4ee5\u4e0d\u540c\u7684\u6837\u5f0f\u7ed8\u5236\u51fa\u6765\uff0c\u4ee5\u5b9e\u73b0\u540c\u6b65\u6548\u679c\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u901a\u5e38\u5728View\u7684<code>onDraw()<\/code>\u65b9\u6cd5\u4e2d\u8fdb\u884c\uff0c\u540c\u65f6\u8981\u8003\u8651\u5230\u7528\u6237\u6ed1\u52a8\u7684\u60c5\u51b5\uff0c\u9632\u6b62\u6ed1\u52a8\u64cd\u4f5c\u4e0e\u81ea\u52a8\u6eda\u52a8\u4ea7\u751f\u51b2\u7a81\u3002<\/li>\n<\/ul>\n<p><p>\u901a\u8fc7\u4ee5\u4e0a\u6b65\u9aa4\uff0c\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u7b80\u7ea6\u4e14\u529f\u80fd\u5b8c\u6574\u7684\u6b4c\u8bcd\u663e\u793a\u63a7\u4ef6\u3002\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\uff0c\u6ce8\u610f\u6027\u80fd\u7684\u4f18\u5316\uff0c\u5982\u5408\u7406\u4f7f\u7528\u5185\u5b58\u3001\u907f\u514d\u5728<code>onDraw()<\/code>\u65b9\u6cd5\u4e2d\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\u7b49\uff0c\u4ee5\u786e\u4fdd\u63a7\u4ef6\u5728\u4e0d\u540c\u8bbe\u5907\u4e0a\u90fd\u80fd\u6d41\u7545\u8fd0\u884c\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u5982\u4f55\u5728 Android \u7a0b\u5e8f\u4ee3\u7801\u4e2d\u81ea\u5b9a\u4e49 View \u6765\u5b9e\u73b0\u7b80\u7ea6\u98ce\u683c\u7684\u6b4c\u8bcd\u63a7\u4ef6\uff1f<\/strong><\/p>\n<p>\u8981\u5b9e\u73b0\u7b80\u7ea6\u98ce\u683c\u7684\u6b4c\u8bcd\u63a7\u4ef6\uff0c\u4f60\u53ef\u4ee5\u81ea\u5b9a\u4e49\u4e00\u4e2a View\uff0c\u5e76\u5728\u5176\u4e0a\u7ed8\u5236\u6b4c\u8bcd\u3002\u9996\u5148\uff0c\u4f60\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u7ee7\u627f\u81ea View\uff0c\u91cd\u5199\u8be5\u7c7b\u7684 onDraw \u65b9\u6cd5\u3002\u5728 onDraw \u65b9\u6cd5\u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 Canvas \u7ed8\u5236\u5404\u79cd\u5f62\u72b6\u3001\u6587\u5b57\u7b49\u5143\u7d20\u6765\u8868\u793a\u6b4c\u8bcd\u3002\u4f60\u53ef\u4ee5\u8bbe\u7f6e\u4e0d\u540c\u7684\u989c\u8272\u3001\u5b57\u4f53\u3001\u5927\u5c0f\u7b49\u6765\u5b9e\u73b0\u7b80\u7ea6\u98ce\u683c\u7684\u6548\u679c\u3002<\/p>\n<p>\u9664\u4e86\u7ed8\u5236\u6b4c\u8bcd\u5916\uff0c\u8fd8\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e9b\u52a8\u753b\u6548\u679c\u6765\u589e\u52a0\u4ea4\u4e92\u6027\u548c\u89c6\u89c9\u6548\u679c\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u5c5e\u6027\u52a8\u753b\u6765\u5b9e\u73b0\u6b4c\u8bcd\u6eda\u52a8\u7684\u6548\u679c\uff0c\u8ba9\u6b4c\u8bcd\u968f\u7740\u97f3\u4e50\u7684\u64ad\u653e\u800c\u81ea\u52a8\u6eda\u52a8\u3002\u53e6\u5916\uff0c\u4f60\u8fd8\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e9b\u89e6\u6478\u4e8b\u4ef6\uff0c\u5982\u70b9\u51fb\u6b4c\u8bcd\u83b7\u53d6\u5bf9\u5e94\u7684\u65f6\u95f4\u70b9\uff0c\u6216\u8005\u6ed1\u52a8\u6b4c\u8bcd\u5b9e\u73b0\u5feb\u8fdb\/\u5feb\u9000\u529f\u80fd\u7b49\u3002<\/p>\n<p>\u5728\u81ea\u5b9a\u4e49 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