{"id":1087,"date":"2015-12-23T18:06:24","date_gmt":"2015-12-23T10:06:24","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=1087"},"modified":"2026-08-18T12:58:45","modified_gmt":"2026-08-18T04:58:45","slug":"android%e5%b1%9e%e6%80%a7%e5%8a%a8%e7%94%bb%e5%ae%8c%e5%85%a8%e8%a7%a3%e6%9e%90%e4%b8%ad%ef%bc%8cvalueanimator%e5%92%8cobjectanimator%e7%9a%84%e9%ab%98%e7%ba%a7%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=1087","title":{"rendered":"Android\u5c5e\u6027\u52a8\u753b\u5b8c\u5168\u89e3\u6790(\u4e2d)\uff0cValueAnimator\u548cObjectAnimator\u7684\u9ad8\u7ea7\u7528\u6cd5"},"content":{"rendered":"
\n
\n

\u5927\u5bb6\u597d\uff0c\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u5f53\u4e2d\uff0c\u6211\u4eec\u5b66\u4e60\u4e86Android\u5c5e\u6027\u52a8\u753b\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u5f53\u7136\u4e5f\u662f\u6700\u5e38\u7528\u7684\u4e00\u4e9b\u7528\u6cd5\uff0c\u8fd9\u4e9b\u7528\u6cd5\u8db3\u4ee5\u8986\u76d6\u6211\u4eec\u5e73\u65f6\u5927\u591a\u60c5\u51b5\u4e0b\u7684\u52a8\u753b\u9700\u6c42\u4e86\u3002\u4f46\u662f\uff0c\u6b63\u5982\u4e0a\u7bc7\u6587\u7ae0\u5f53\u4e2d\u6240\u8bf4\u5230\u7684\uff0c\u5c5e\u6027\u52a8\u753b\u5bf9\u8865\u95f4\u52a8\u753b\u8fdb\u884c\u4e86\u5f88\u5927\u5e45\u5ea6\u7684\u6539\u8fdb\uff0c\u4e4b\u524d\u8865\u95f4\u52a8\u753b\u53ef\u4ee5\u505a\u5230\u7684\u5c5e\u6027\u52a8\u753b\u4e5f\u80fd\u505a\u5230\uff0c\u8865\u95f4\u52a8\u753b\u505a\u4e0d\u5230\u7684\u73b0\u5728\u5c5e\u6027\u52a8\u753b\u4e5f\u53ef\u4ee5\u505a\u5230\u4e86\u3002\u56e0\u6b64\uff0c\u4eca\u5929\u6211\u4eec\u5c31\u6765\u5b66\u4e60\u4e00\u4e0b\u5c5e\u6027\u52a8\u753b\u7684\u9ad8\u7ea7\u7528\u6cd5\uff0c\u770b\u770b\u5982\u4f55\u5b9e\u73b0\u4e00\u4e9b\u8865\u95f4\u52a8\u753b\u6240\u65e0\u6cd5\u5b9e\u73b0\u7684\u529f\u80fd\u3002<\/p>\n<\/blockquote>\n


\n\"\"<\/a><\/p>\n

\u5927\u5bb6\u597d\uff0c\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u5f53\u4e2d\uff0c\u6211\u4eec\u5b66\u4e60\u4e86Android\u5c5e\u6027\u52a8\u753b\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u5f53\u7136\u4e5f\u662f\u6700\u5e38\u7528\u7684\u4e00\u4e9b\u7528\u6cd5\uff0c\u8fd9\u4e9b\u7528\u6cd5\u8db3\u4ee5\u8986\u76d6\u6211\u4eec\u5e73\u65f6\u5927\u591a\u60c5\u51b5\u4e0b\u7684\u52a8\u753b\u9700\u6c42\u4e86\u3002\u4f46\u662f\uff0c\u6b63\u5982\u4e0a\u7bc7\u6587\u7ae0\u5f53\u4e2d\u6240\u8bf4\u5230\u7684\uff0c\u5c5e\u6027\u52a8\u753b\u5bf9\u8865\u95f4\u52a8\u753b\u8fdb\u884c\u4e86\u5f88\u5927\u5e45\u5ea6\u7684\u6539\u8fdb\uff0c\u4e4b\u524d \u8865\u95f4\u52a8\u753b\u53ef\u4ee5\u505a\u5230\u7684\u5c5e\u6027\u52a8\u753b\u4e5f\u80fd\u505a\u5230\uff0c\u8865\u95f4\u52a8\u753b\u505a\u4e0d\u5230\u7684\u73b0\u5728\u5c5e\u6027\u52a8\u753b\u4e5f\u53ef\u4ee5\u505a\u5230\u4e86\u3002\u56e0\u6b64\uff0c\u4eca\u5929\u6211\u4eec\u5c31\u6765\u5b66\u4e60\u4e00\u4e0b\u5c5e\u6027\u52a8\u753b\u7684\u9ad8\u7ea7\u7528\u6cd5\uff0c\u770b\u770b\u5982\u4f55\u5b9e\u73b0\u4e00\u4e9b\u8865\u95f4\u52a8\u753b\u6240\u65e0\u6cd5\u5b9e\u73b0\u7684\u529f\u80fd\u3002<\/p>\n

\u9605\u8bfb\u672c\u7bc7\u6587\u7ae0\u9700\u8981\u4f60\u5bf9\u5c5e\u6027\u52a8\u753b\u6709\u4e00\u5b9a\u7684\u4e86\u89e3\uff0c\u5e76\u4e14\u638c\u63e1\u5c5e\u6027\u52a8\u753b\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u5982\u679c\u4f60\u8fd8\u5bf9\u5c5e\u6027\u52a8\u753b\u4e0d\u591f\u4e86\u89e3\u7684\u8bdd\uff0c\u5efa\u8bae\u5148\u53bb\u9605\u8bfb\u00a0Android\u5c5e\u6027\u52a8\u753b\u5b8c\u5168\u89e3\u6790(\u4e0a)\uff0c\u521d\u8bc6\u5c5e\u6027\u52a8\u753b\u7684\u57fa\u672c\u7528\u6cd5<\/strong>\u00a0<\/a>\u3002<\/p>\n

ValueAnimator\u7684\u9ad8\u7ea7\u7528\u6cd5<\/span><\/h2>\n

\u5728\u4e0a\u7bc7\u6587\u7ae0\u4e2d\u4ecb\u7ecd\u8865\u95f4\u52a8\u753b\u7f3a\u70b9\u7684\u65f6\u5019\u6709\u63d0\u5230\u8fc7\uff0c\u8865\u95f4\u52a8\u753b\u662f\u53ea\u80fd\u5bf9View\u5bf9\u8c61\u8fdb\u884c\u52a8\u753b\u64cd\u4f5c\u7684\u3002\u800c\u5c5e\u6027\u52a8\u753b\u5c31\u4e0d\u518d\u53d7\u8fd9\u4e2a\u9650\u5236\uff0c\u5b83\u53ef\u4ee5\u5bf9\u4efb\u610f\u5bf9\u8c61\u8fdb\u884c\u52a8\u753b\u64cd\u4f5c\u3002\u90a3\u4e48\u5927\u5bb6\u5e94\u8be5\u8fd8\u8bb0\u5f97\u5728\u4e0a\u7bc7\u6587\u7ae0\u5f53\u4e2d\u6211\u4e3e\u7684\u4e00\u4e2a\u4f8b\u5b50\uff0c\u6bd4\u5982\u8bf4\u6211\u4eec\u6709\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684View\uff0c\u5728\u8fd9\u4e2aView\u5f53\u4e2d\u6709\u4e00\u4e2aPoint\u5bf9\u8c61\u7528\u4e8e\u7ba1\u7406\u5750\u6807\uff0c\u7136\u540e\u5728onDraw()\u65b9\u6cd5\u5f53\u4e2d\u5c31\u662f\u6839\u636e\u8fd9\u4e2aPoint\u5bf9\u8c61\u7684\u5750\u6807\u503c\u6765\u8fdb\u884c\u7ed8\u5236\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u6211\u4eec\u53ef\u4ee5\u5bf9Point\u5bf9\u8c61\u8fdb\u884c\u52a8\u753b\u64cd\u4f5c\uff0c\u90a3\u4e48\u6574\u4e2a\u81ea\u5b9a\u4e49View\u7684\u52a8\u753b\u6548\u679c\u5c31\u6709\u4e86\u3002OK\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u6765\u5b66\u4e60\u4e00\u4e0b\u5982\u4f55\u5b9e\u73b0\u8fd9\u6837\u7684\u6548\u679c\u3002<\/p>\n

\u5728\u5f00\u59cb\u52a8\u624b\u4e4b\u524d\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u638c\u63e1\u53e6\u5916\u4e00\u4e2a\u77e5\u8bc6\u70b9\uff0c\u5c31\u662fTypeEvaluator\u7684\u7528\u6cd5\u3002\u53ef\u80fd\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u6211\u4eec\u4f7f\u7528\u5c5e\u6027\u52a8\u753b\u7684\u65f6\u5019\u90fd\u4e0d\u4f1a\u7528\u5230TypeEvaluator\uff0c\u4f46\u662f\u5927\u5bb6\u8fd8\u662f\u5e94\u8be5\u4e86\u89e3\u4e00\u4e0b\u5b83\u7684\u7528\u6cd5\uff0c\u4ee5\u9632\u6b62\u5f53\u6211\u4eec\u9047\u5230\u4e00\u4e9b\u89e3\u51b3\u4e0d\u6389\u7684\u95ee\u9898\u65f6\u80fd\u591f\u60f3\u8d77\u6765\u8fd8\u6709\u8fd9\u6837\u7684\u4e00\u79cd\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n

\u90a3\u4e48TypeEvaluator\u7684\u4f5c\u7528\u5230\u5e95\u662f\u4ec0\u4e48\u5462\uff1f\u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u544a\u8bc9\u52a8\u753b\u7cfb\u7edf\u5982\u4f55\u4ece\u521d\u59cb\u503c\u8fc7\u5ea6\u5230\u7ed3\u675f\u503c\u3002\u6211\u4eec\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\u5b66\u5230\u7684ValueAnimator.ofFloat()\u65b9\u6cd5\u5c31\u662f\u5b9e\u73b0\u4e86\u521d\u59cb\u503c\u4e0e\u7ed3\u675f\u503c\u4e4b\u95f4\u7684\u5e73\u6ed1\u8fc7\u5ea6\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5e73\u6ed1\u8fc7\u5ea6\u662f\u600e\u4e48\u505a\u5230\u7684\u5462\uff1f\u5176\u5b9e\u5c31\u662f\u7cfb\u7edf\u5185\u7f6e\u4e86\u4e00\u4e2aFloatEvaluator\uff0c\u5b83\u901a\u8fc7\u8ba1\u7b97\u544a\u77e5\u52a8\u753b\u7cfb\u7edf\u5982\u4f55\u4ece\u521d\u59cb\u503c\u8fc7\u5ea6\u5230\u7ed3\u675f\u503c\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0bFloatEvaluator\u7684\u4ee3\u7801\u5b9e\u73b0\uff1a<\/p>\n

public<\/span> class<\/span> FloatEvaluator<\/span> implements<\/span> TypeEvaluator<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> Object evaluate<\/span>(<\/span>float<\/span> fraction<\/span>,<\/span> Object<\/span> startValue<\/span>,<\/span> Object<\/span> endValue<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>float<\/span> startFloat<\/span> =<\/span> (<\/span>(<\/span>Number<\/span>)<\/span> startValue<\/span>)<\/span>.<\/span>floatValue<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span> startFloat<\/span> +<\/span> fraction<\/span> *<\/span> (<\/span>(<\/span>(<\/span>Number<\/span>)<\/span> endValue<\/span>)<\/span>.<\/span>floatValue<\/span>(<\/span>)<\/span> -<\/span> startFloat<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
}<\/span><\/div><\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\uff0cFloatEvaluator\u5b9e\u73b0\u4e86TypeEvaluator\u63a5\u53e3\uff0c\u7136\u540e\u91cd\u5199evaluate()\u65b9\u6cd5\u3002evaluate()\u65b9\u6cd5\u5f53\u4e2d\u4f20\u5165\u4e86\u4e09\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570fraction\u975e\u5e38\u91cd\u8981\uff0c\u8fd9\u4e2a\u53c2\u6570\u7528\u4e8e\u8868\u793a\u52a8\u753b\u7684\u5b8c\u6210\u5ea6\u7684\uff0c\u6211\u4eec\u5e94\u8be5\u6839\u636e\u5b83\u6765\u8ba1\u7b97\u5f53\u524d\u52a8\u753b\u7684\u503c\u5e94\u8be5\u662f\u591a\u5c11\uff0c\u7b2c\u4e8c\u7b2c\u4e09\u4e2a\u53c2\u6570\u5206\u522b\u8868\u793a\u52a8\u753b\u7684\u521d\u59cb\u503c\u548c\u7ed3\u675f\u503c\u3002\u90a3\u4e48\u4e0a\u8ff0\u4ee3\u7801\u7684\u903b\u8f91\u5c31\u6bd4\u8f83\u6e05\u6670\u4e86\uff0c\u7528\u7ed3\u675f\u503c\u51cf\u53bb\u521d\u59cb\u503c\uff0c\u7b97\u51fa\u5b83\u4eec\u4e4b\u95f4\u7684\u5dee\u503c\uff0c\u7136\u540e\u4e58\u4ee5fraction\u8fd9\u4e2a\u7cfb\u6570\uff0c\u518d\u52a0\u4e0a\u521d\u59cb\u503c\uff0c\u90a3\u4e48\u5c31\u5f97\u5230\u5f53\u524d\u52a8\u753b\u7684\u503c\u4e86\u3002<\/p>\n
\u597d\u7684\uff0c\u90a3FloatEvaluator\u662f\u7cfb\u7edf\u5185\u7f6e\u597d\u7684\u529f\u80fd\uff0c\u5e76\u4e0d\u9700\u8981\u6211\u4eec\u81ea\u5df1\u53bb\u7f16\u5199\uff0c\u4f46\u4ecb\u7ecd\u5b83\u7684\u5b9e\u73b0\u65b9\u6cd5\u662f\u8981\u4e3a\u6211\u4eec\u540e\u9762\u7684\u529f\u80fd\u94fa\u8def\u7684\u3002\u524d\u9762\u6211\u4eec\u4f7f\u7528\u8fc7\u4e86ValueAnimator\u7684ofFloat()\u548cofInt()\u65b9\u6cd5\uff0c\u5206\u522b\u7528\u4e8e\u5bf9\u6d6e\u70b9\u578b\u548c\u6574\u578b\u7684\u6570\u636e\u8fdb\u884c\u52a8\u753b\u64cd\u4f5c\u7684\uff0c\u4f46\u5b9e\u9645\u4e0aValueAnimator\u4e2d\u8fd8\u6709\u4e00\u4e2aofObject()\u65b9\u6cd5\uff0c\u662f\u7528\u4e8e\u5bf9\u4efb\u610f\u5bf9\u8c61\u8fdb\u884c\u52a8\u753b\u64cd\u4f5c\u7684\u3002\u4f46\u662f\u76f8\u6bd4\u4e8e\u6d6e\u70b9\u578b\u6216\u6574\u578b\u6570\u636e\uff0c\u5bf9\u8c61\u7684\u52a8\u753b\u64cd\u4f5c\u660e\u663e\u8981\u66f4\u590d\u6742\u4e00\u4e9b\uff0c\u56e0\u4e3a\u7cfb\u7edf\u5c06\u5b8c\u5168\u65e0\u6cd5\u77e5\u9053\u5982\u4f55\u4ece\u521d\u59cb\u5bf9\u8c61\u8fc7\u5ea6\u5230\u7ed3\u675f\u5bf9\u8c61\uff0c\u56e0\u6b64\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u5c31\u9700\u8981\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5df1\u7684TypeEvaluator\u6765\u544a\u77e5\u7cfb\u7edf\u5982\u4f55\u8fdb\u884c\u8fc7\u5ea6\u3002<\/p>\n
\u4e0b\u9762\u6765\u5148\u5b9a\u4e49\u4e00\u4e2aPoint\u7c7b\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public<\/span> class<\/span> Point<\/span> {<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>private<\/span> float<\/span> x<\/span>;<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>private<\/span> float<\/span> y<\/span>;<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> Point<\/span>(<\/span>float<\/span> x<\/span>,<\/span> float<\/span> y<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>x<\/span> =<\/span> x<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>y<\/span> =<\/span> y<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> float<\/span> getX<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span> x<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> float<\/span> getY<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span> y<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
}<\/span><\/div><\/code><\/pre>\n
Point\u7c7b\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u6709x\u548cy\u4e24\u4e2a\u53d8\u91cf\u7528\u4e8e\u8bb0\u5f55\u5750\u6807\u7684\u4f4d\u7f6e\uff0c\u5e76\u63d0\u4f9b\u4e86\u6784\u9020\u65b9\u6cd5\u6765\u8bbe\u7f6e\u5750\u6807\uff0c\u4ee5\u53caget\u65b9\u6cd5\u6765\u83b7\u53d6\u5750\u6807\u3002\u63a5\u4e0b\u6765\u5b9a\u4e49PointEvaluator\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public<\/span> class<\/span> PointEvaluator<\/span> implements<\/span> TypeEvaluator<\/span>{<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>@Override<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> Object<\/span> evaluate<\/span>(<\/span>float<\/span> fraction<\/span>,<\/span> Object<\/span> startValue<\/span>,<\/span> Object<\/span> endValue<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Point <\/span>startPoint<\/span> =<\/span> (<\/span>Point<\/span>)<\/span> startValue<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Point <\/span>endPoint<\/span> =<\/span> (<\/span>Point<\/span>)<\/span> endValue<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>float<\/span> x<\/span> =<\/span> startPoint<\/span>.<\/span>getX<\/span>(<\/span>)<\/span> +<\/span> fraction<\/span> *<\/span> (<\/span>endPoint<\/span>.<\/span>getX<\/span>(<\/span>)<\/span> -<\/span> startPoint<\/span>.<\/span>getX<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>float<\/span> y<\/span> =<\/span> startPoint<\/span>.<\/span>getY<\/span>(<\/span>)<\/span> +<\/span> fraction<\/span> *<\/span> (<\/span>endPoint<\/span>.<\/span>getY<\/span>(<\/span>)<\/span> -<\/span> startPoint<\/span>.<\/span>getY<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Point <\/span>point<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>x<\/span>,<\/span> y<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span> point<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
}<\/span><\/div><\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\uff0cPointEvaluator\u540c\u6837\u5b9e\u73b0\u4e86TypeEvaluator\u63a5\u53e3\u5e76\u91cd\u5199\u4e86evaluate()\u65b9\u6cd5\u3002\u5176\u5b9eevaluate()\u65b9\u6cd5\u4e2d\u7684\u903b\u8f91\u8fd8\u662f\u975e\u5e38\u7b80\u5355\u7684\uff0c\u5148\u662f\u5c06startValue\u548cendValue\u5f3a\u8f6c\u6210Point\u5bf9\u8c61\uff0c\u7136\u540e\u540c\u6837\u6839\u636efraction\u6765\u8ba1\u7b97\u5f53\u524d\u52a8\u753b\u7684x\u548cy\u7684\u503c\uff0c\u6700\u540e\u7ec4\u88c5\u5230\u4e00\u4e2a\u65b0\u7684Point\u5bf9\u8c61\u5f53\u4e2d\u5e76\u8fd4\u56de\u3002<\/p>\n
\u8fd9\u6837\u6211\u4eec\u5c31\u5c06PointEvaluator\u7f16\u5199\u5b8c\u6210\u4e86\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u53ef\u4ee5\u975e\u5e38\u8f7b\u677e\u5730\u5bf9Point\u5bf9\u8c61\u8fdb\u884c\u52a8\u753b\u64cd\u4f5c\u4e86\uff0c\u6bd4\u5982\u8bf4\u6211\u4eec\u6709\u4e24\u4e2aPoint\u5bf9\u8c61\uff0c\u73b0\u5728\u9700\u8981\u5c06Point1\u901a\u8fc7\u52a8\u753b\u5e73\u6ed1\u8fc7\u5ea6\u5230Point2\uff0c\u5c31\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n
Point <\/span>point1<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>0<\/span>,<\/span> 0<\/span>)<\/span>;<\/span><\/div>\n
Point <\/span>point2<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>300<\/span>,<\/span> 300<\/span>)<\/span>;<\/span><\/div>\n
ValueAnimator <\/span>anim<\/span> =<\/span> ValueAnimator<\/span>.<\/span>ofObject<\/span>(<\/span>new<\/span> PointEvaluator<\/span>(<\/span>)<\/span>,<\/span> point1<\/span>,<\/span> point2<\/span>)<\/span>;<\/span><\/div>\n
anim<\/span>.<\/span>setDuration<\/span>(<\/span>5000<\/span>)<\/span>;<\/span><\/div>\n
anim<\/span>.<\/span>start<\/span>(<\/span>)<\/span>;<\/span><\/div><\/code><\/pre>\n
\u4ee3\u7801\u5f88\u7b80\u5355\uff0c\u8fd9\u91cc\u6211\u4eec\u5148\u662fnew\u51fa\u4e86\u4e24\u4e2aPoint\u5bf9\u8c61\uff0c\u5e76\u5728\u6784\u9020\u51fd\u6570\u4e2d\u5206\u522b\u8bbe\u7f6e\u4e86\u5b83\u4eec\u7684\u5750\u6807\u70b9\u3002\u7136\u540e\u8c03\u7528ValueAnimator\u7684ofObject()\u65b9\u6cd5\u6765\u6784\u5efaValueAnimator\u7684\u5b9e\u4f8b\uff0c\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cofObject()\u65b9\u6cd5\u8981\u6c42\u591a\u4f20\u5165\u4e00\u4e2aTypeEvaluator\u53c2\u6570\uff0c\u8fd9\u91cc\u6211\u4eec\u53ea\u9700\u8981\u4f20\u5165\u521a\u624d\u5b9a\u4e49\u597d\u7684PointEvaluator\u7684\u5b9e\u4f8b\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
\u597d\u7684\uff0c\u8fd9\u5c31\u662f\u81ea\u5b9a\u4e49TypeEvaluator\u7684\u5168\u90e8\u7528\u6cd5\uff0c\u638c\u63e1\u4e86\u8fd9\u4e9b\u77e5\u8bc6\u4e4b\u540e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u6765\u5c1d\u8bd5\u4e00\u4e0b\u5982\u4f55\u901a\u8fc7\u5bf9Point\u5bf9\u8c61\u8fdb\u884c\u52a8\u753b\u64cd\u4f5c\uff0c\u4ece\u800c\u5b9e\u73b0\u6574\u4e2a\u81ea\u5b9a\u4e49View\u7684\u52a8\u753b\u6548\u679c\u3002<\/p>\n
\u65b0\u5efa\u4e00\u4e2aMyAnimView\u7ee7\u627f\u81eaView\uff0c\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public<\/span> class<\/span> MyAnimView<\/span> extends<\/span> View<\/span> {<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> static<\/span> final<\/span> float<\/span> RADIUS<\/span> =<\/span> 50f<\/span>;<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>private<\/span> Point <\/span>currentPoint<\/span>;<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>private<\/span> Paint <\/span>mPaint<\/span>;<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> MyAnimView<\/span>(<\/span>Context <\/span>context<\/span>,<\/span> AttributeSet <\/span>attrs<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>super<\/span>(<\/span>context<\/span>,<\/span> attrs<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>mPaint<\/span> =<\/span> new<\/span> Paint<\/span>(<\/span>Paint<\/span>.<\/span>ANTI_ALIAS_FLAG<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>mPaint<\/span>.<\/span>setColor<\/span>(<\/span>Color<\/span>.<\/span>BLUE<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>@Override<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>protected<\/span> void<\/span> onDraw<\/span>(<\/span>Canvas <\/span>canvas<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>if<\/span> (<\/span>currentPoint<\/span> ==<\/span> null<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>currentPoint<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>RADIUS<\/span>,<\/span> RADIUS<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>drawCircle<\/span>(<\/span>canvas<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>startAnimation<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span> else<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>drawCircle<\/span>(<\/span>canvas<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>private<\/span> void<\/span> drawCircle<\/span>(<\/span>Canvas <\/span>canvas<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>float<\/span> x<\/span> =<\/span> currentPoint<\/span>.<\/span>getX<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>float<\/span> y<\/span> =<\/span> currentPoint<\/span>.<\/span>getY<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>canvas<\/span>.<\/span>drawCircle<\/span>(<\/span>x<\/span>,<\/span> y<\/span>,<\/span> RADIUS<\/span>,<\/span> mPaint<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>private<\/span> void<\/span> startAnimation<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Point <\/span>startPoint<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>RADIUS<\/span>,<\/span> RADIUS<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Point <\/span>endPoint<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>getWidth<\/span>(<\/span>)<\/span> -<\/span> RADIUS<\/span>,<\/span> getHeight<\/span>(<\/span>)<\/span> -<\/span> RADIUS<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>ValueAnimator <\/span>anim<\/span> =<\/span> ValueAnimator<\/span>.<\/span>ofObject<\/span>(<\/span>new<\/span> PointEvaluator<\/span>(<\/span>)<\/span>,<\/span> startPoint<\/span>,<\/span> endPoint<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>anim<\/span>.<\/span>addUpdateListener<\/span>(<\/span>new<\/span> ValueAnimator<\/span>.<\/span>AnimatorUpdateListener<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>@Override<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> void<\/span> onAnimationUpdate<\/span>(<\/span>ValueAnimator <\/span>animation<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>currentPoint<\/span> =<\/span> (<\/span>Point<\/span>)<\/span> animation<\/span>.<\/span>getAnimatedValue<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>invalidate<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>anim<\/span>.<\/span>setDuration<\/span>(<\/span>5000<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>anim<\/span>.<\/span>start<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
}<\/span><\/div><\/code><\/pre>\n
\u57fa\u672c\u4e0a\u8fd8\u662f\u5f88\u7b80\u5355\u7684\uff0c\u603b\u5171\u4e5f\u6ca1\u51e0\u884c\u4ee3\u7801\u3002\u9996\u5148\u5728\u81ea\u5b9a\u4e49View\u7684\u6784\u9020\u65b9\u6cd5\u5f53\u4e2d\u521d\u59cb\u5316\u4e86\u4e00\u4e2aPaint\u5bf9\u8c61\u4f5c\u4e3a\u753b\u7b14\uff0c\u5e76\u5c06\u753b\u7b14\u989c\u8272\u8bbe\u7f6e\u4e3a\u84dd\u8272\uff0c\u63a5\u7740\u5728onDraw()\u65b9\u6cd5\u5f53\u4e2d\u8fdb\u884c\u7ed8\u5236\u3002\u8fd9\u91cc\u6211\u4eec\u7ed8\u5236\u7684\u903b\u8f91\u662f\u7531currentPoint\u8fd9\u4e2a\u5bf9\u8c61\u63a7\u5236\u7684\uff0c\u5982\u679ccurrentPoint\u5bf9\u8c61\u4e0d\u7b49\u4e8e\u7a7a\uff0c\u90a3\u4e48\u5c31\u8c03\u7528drawCircle()\u65b9\u6cd5\u5728currentPoint\u7684\u5750\u6807\u4f4d\u7f6e\u753b\u51fa\u4e00\u4e2a\u534a\u5f84\u4e3a50\u7684\u5706\uff0c\u5982\u679ccurrentPoint\u5bf9\u8c61\u662f\u7a7a\uff0c\u90a3\u4e48\u5c31\u8c03\u7528startAnimation()\u65b9\u6cd5\u6765\u542f\u52a8\u52a8\u753b\u3002<\/p>\n
\u90a3\u4e48\u6211\u4eec\u6765\u89c2\u5bdf\u4e00\u4e0bstartAnimation()\u65b9\u6cd5\u4e2d\u7684\u4ee3\u7801\uff0c\u5176\u5b9e\u5927\u5bb6\u5e94\u8be5\u5f88\u719f\u6089\u4e86\uff0c\u5c31\u662f\u5bf9Point\u5bf9\u8c61\u8fdb\u884c\u4e86\u4e00\u4e2a\u52a8\u753b\u64cd\u4f5c\u800c\u5df2\u3002\u8fd9\u91cc\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2astartPoint\u548c\u4e00\u4e2aendPoint\uff0c\u5750\u6807\u5206\u522b\u662fView\u7684\u5de6\u4e0a\u89d2\u548c\u53f3\u4e0b\u89d2\uff0c\u5e76\u5c06\u52a8\u753b\u7684\u65f6\u957f\u8bbe\u4e3a5\u79d2\u3002\u7136\u540e\u6709\u4e00\u70b9\u9700\u8981\u5927\u5bb6\u6ce8\u610f\u7684\uff0c\u5c31\u662f\u6211\u4eec\u901a\u8fc7\u76d1\u542c\u5668\u5bf9\u52a8\u753b\u7684\u8fc7\u7a0b\u8fdb\u884c\u4e86\u76d1\u542c\uff0c\u6bcf\u5f53Point\u503c\u6709\u6539\u53d8\u7684\u65f6\u5019\u90fd\u4f1a\u56de\u8c03onAnimationUpdate()\u65b9\u6cd5\u3002\u5728\u8fd9\u4e2a\u65b9\u6cd5\u5f53\u4e2d\uff0c\u6211\u4eec\u5bf9currentPoint\u5bf9\u8c61\u8fdb\u884c\u4e86\u91cd\u65b0\u8d4b\u503c\uff0c\u5e76\u8c03\u7528\u4e86invalidate()\u65b9\u6cd5\uff0c\u8fd9\u6837\u7684\u8bddonDraw()\u65b9\u6cd5\u5c31\u4f1a\u91cd\u65b0\u8c03\u7528\uff0c\u5e76\u4e14\u7531\u4e8ecurrentPoint\u5bf9\u8c61\u7684\u5750\u6807\u5df2\u7ecf\u6539\u53d8\u4e86\uff0c\u90a3\u4e48\u7ed8\u5236\u7684\u4f4d\u7f6e\u4e5f\u4f1a\u6539\u53d8\uff0c\u4e8e\u662f\u4e00\u4e2a\u5e73\u79fb\u7684\u52a8\u753b\u6548\u679c\u4e5f\u5c31\u5b9e\u73b0\u4e86\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u53ea\u9700\u8981\u5728\u5e03\u5c40\u6587\u4ef6\u5f53\u4e2d\u5f15\u5165\u8fd9\u4e2a\u81ea\u5b9a\u4e49\u63a7\u4ef6\uff1a<\/p>\n
<<\/span>RelativeLayout <\/span>xmlns<\/span>:<\/span>android<\/span>=<\/span>\"http:\/\/schemas.android.com\/apk\/res\/android\"<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>android<\/span>:<\/span>layout_width<\/span>=<\/span>\"match_parent\"<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>android<\/span>:<\/span>layout_height<\/span>=<\/span>\"match_parent\"<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>><\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span><<\/span>com<\/span>.<\/span>example<\/span>.<\/span>tony<\/span>.<\/span>myapplication<\/span>.<\/span>MyAnimView<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>android<\/span>:<\/span>layout_width<\/span>=<\/span>\"match_parent\"<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>android<\/span>:<\/span>layout_height<\/span>=<\/span>\"match_parent\"<\/span> \/<\/span>><\/span><\/div>\n
<\/div>\n
<<\/span>\/<\/span>RelativeLayout<\/span>><\/span><\/div><\/code><\/pre>\n
\u6700\u540e\u8fd0\u884c\u4e00\u4e0b\u7a0b\u5e8f\uff0c\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
\"\"<\/p>\n
OK\uff01\u8fd9\u6837\u6211\u4eec\u5c31\u6210\u529f\u5b9e\u73b0\u4e86\u901a\u8fc7\u5bf9\u5bf9\u8c61\u8fdb\u884c\u503c\u64cd\u4f5c\u6765\u5b9e\u73b0\u52a8\u753b\u6548\u679c\u7684\u529f\u80fd\uff0c\u8fd9\u5c31\u662fValueAnimator\u7684\u9ad8\u7ea7\u7528\u6cd5\u3002<\/p>\n
ObjectAnimator\u7684\u9ad8\u7ea7\u7528\u6cd5<\/span><\/h2>\n
ObjectAnimator\u7684\u57fa\u672c\u7528\u6cd5\u548c\u5de5\u4f5c\u539f\u7406\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u5f53\u4e2d\u90fd\u5df2\u7ecf\u8bb2\u89e3\u8fc7\u4e86\uff0c\u76f8\u4fe1\u5927\u5bb6\u90fd\u5df2\u7ecf\u638c\u63e1\u3002\u90a3\u4e48\u5927\u5bb6\u5e94\u8be5\u90fd\u8fd8\u8bb0\u5f97\uff0c\u6211\u4eec\u5728\u5410\u69fd\u8865\u95f4\u52a8\u753b\u7684\u65f6\u5019\u6709\u63d0\u5230\u8fc7\uff0c\u8865\u95f4\u52a8\u753b\u662f\u53ea\u80fd\u5b9e\u73b0\u79fb\u52a8\u3001\u7f29\u653e\u3001\u65cb\u8f6c\u548c\u6de1\u5165\u6de1\u51fa\u8fd9\u56db\u79cd\u52a8\u753b\u64cd\u4f5c\u7684\uff0c\u529f\u80fd\u9650\u5b9a\u6b7b\u5c31\u662f\u8fd9\u4e9b\uff0c\u57fa\u672c\u4e0a\u6ca1\u6709\u4efb\u4f55\u6269\u5c55\u6027\u53ef\u8a00\u3002\u6bd4\u5982\u6211\u4eec\u60f3\u8981\u5b9e\u73b0\u5bf9View\u7684\u989c\u8272\u8fdb\u884c\u52a8\u6001\u6539\u53d8\uff0c\u8865\u95f4\u52a8\u753b\u662f\u6ca1\u6709\u529e\u6cd5\u505a\u5230\u7684\u3002<\/p>\n
\u4f46\u662f\u5c5e\u6027\u52a8\u753b\u5c31\u4e0d\u4f1a\u53d7\u8fd9\u4e9b\u6761\u6761\u6846\u6846\u7684\u9650\u5236\uff0c\u5b83\u7684\u6269\u5c55\u6027\u975e\u5e38\u5f3a\uff0c\u5bf9\u4e8e\u52a8\u6001\u6539\u53d8View\u7684\u989c\u8272\u8fd9\u79cd\u529f\u80fd\u662f\u5b8c\u5168\u53ef\u662f\u80dc\u4efb\u7684\uff0c\u90a3\u4e48\u4e0b\u9762\u6211\u4eec\u5c31\u6765\u5b66\u4e60\u4e00\u4e0b\u5982\u4f55\u5b9e\u73b0\u8fd9\u6837\u7684\u6548\u679c\u3002<\/p>\n
\u5927\u5bb6\u5e94\u8be5\u90fd\u8fd8\u8bb0\u5f97\uff0cObjectAnimator\u5185\u90e8\u7684\u5de5\u4f5c\u673a\u5236\u662f\u901a\u8fc7\u5bfb\u627e\u7279\u5b9a\u5c5e\u6027\u7684get\u548cset\u65b9\u6cd5\uff0c\u7136\u540e\u901a\u8fc7\u65b9\u6cd5\u4e0d\u65ad\u5730\u5bf9\u503c\u8fdb\u884c\u6539\u53d8\uff0c\u4ece\u800c\u5b9e\u73b0\u52a8\u753b\u6548\u679c\u7684\u3002\u56e0\u6b64\u6211\u4eec\u5c31\u9700\u8981\u5728MyAnimView\u4e2d\u5b9a\u4e49\u4e00\u4e2acolor\u5c5e\u6027\uff0c\u5e76\u63d0\u4f9b\u5b83\u7684get\u548cset\u65b9\u6cd5\u3002\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u5c06color\u5c5e\u6027\u8bbe\u7f6e\u4e3a\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u4f7f\u7528#RRGGBB\u8fd9\u79cd\u683c\u5f0f\u6765\u8868\u793a\u989c\u8272\u503c\uff0c\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public<\/span> class<\/span> MyAnimView<\/span> extends<\/span> View<\/span> {<\/span><\/div>\n
<\/div>\n
.<\/span>.<\/span>.<\/span><\/div>\n
<\/div>\n
private<\/span> String<\/span> color<\/span>;<\/span><\/div>\n
<\/div>\n
public<\/span> String<\/span> getColor<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
return<\/span> color<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
<\/div>\n
public<\/span> void<\/span> setColor<\/span>(<\/span>String<\/span> color<\/span>)<\/span> {<\/span><\/div>\n
this<\/span>.<\/span>color<\/span> =<\/span> color<\/span>;<\/span><\/div>\n
mPaint<\/span>.<\/span>setColor<\/span>(<\/span>Color<\/span>.<\/span>parseColor<\/span>(<\/span>color<\/span>)<\/span>)<\/span>;<\/span><\/div>\n
invalidate<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
<\/div>\n
.<\/span>.<\/span>.<\/span><\/div>\n
<\/div>\n
}<\/span><\/div><\/code><\/pre>\n
\u6ce8\u610f\u5728setColor()\u65b9\u6cd5\u5f53\u4e2d\uff0c\u6211\u4eec\u7f16\u5199\u4e86\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684\u903b\u8f91\uff0c\u5c31\u662f\u5c06\u753b\u7b14\u7684\u989c\u8272\u8bbe\u7f6e\u6210\u65b9\u6cd5\u53c2\u6570\u4f20\u5165\u7684\u989c\u8272\uff0c\u7136\u540e\u8c03\u7528\u4e86invalidate()\u65b9\u6cd5\u3002\u8fd9\u6bb5\u4ee3\u7801\u867d\u7136\u53ea\u6709\u4e09\u884c\uff0c\u4f46\u662f\u5374\u6267\u884c\u4e86\u4e00\u4e2a\u975e\u5e38\u6838\u5fc3\u7684\u529f\u80fd\uff0c\u5c31\u662f\u5728\u6539\u53d8\u4e86\u753b\u7b14\u989c\u8272\u4e4b\u540e\u7acb\u5373\u5237\u65b0\u89c6\u56fe\uff0c\u7136\u540eonDraw()\u65b9\u6cd5\u5c31\u4f1a\u8c03\u7528\u3002\u5728onDraw()\u65b9\u6cd5\u5f53\u4e2d\u4f1a\u6839\u636e\u5f53\u524d\u753b\u7b14\u7684\u989c\u8272\u6765\u8fdb\u884c\u7ed8\u5236\uff0c\u8fd9\u6837\u989c\u8272\u4e5f\u5c31\u4f1a\u52a8\u6001\u8fdb\u884c\u6539\u53d8\u4e86\u3002<\/p>\n
\u90a3\u4e48\u63a5\u4e0b\u6765\u7684\u95ee\u9898\u5c31\u662f\u600e\u6837\u8ba9setColor()\u65b9\u6cd5\u5f97\u5230\u8c03\u7528\u4e86\uff0c\u6beb\u65e0\u7591\u95ee\uff0c\u5f53\u7136\u662f\u8981\u501f\u52a9ObjectAnimator\u7c7b\uff0c\u4f46\u662f\u5728\u4f7f\u7528ObjectAnimator\u4e4b\u524d\u6211\u4eec\u8fd8\u8981\u5b8c\u6210\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u5de5\u4f5c\uff0c\u5c31\u662f\u7f16\u5199\u4e00\u4e2a\u7528\u4e8e\u544a\u77e5\u7cfb\u7edf\u5982\u4f55\u8fdb\u884c\u989c\u8272\u8fc7\u5ea6\u7684TypeEvaluator\u3002\u521b\u5efaColorEvaluator\u5e76\u5b9e\u73b0TypeEvaluator\u63a5\u53e3\uff0c\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public<\/span> class<\/span> ColorEvaluator<\/span> implements<\/span> TypeEvaluator<\/span> {<\/span><\/div>\n
<\/div>\n
private<\/span> int<\/span> mCurrentRed<\/span> =<\/span> -<\/span>1<\/span>;<\/span><\/div>\n
<\/div>\n
private<\/span> int<\/span> mCurrentGreen<\/span> =<\/span> -<\/span>1<\/span>;<\/span><\/div>\n
<\/div>\n
private<\/span> int<\/span> mCurrentBlue<\/span> =<\/span> -<\/span>1<\/span>;<\/span><\/div>\n
<\/div>\n
@Override<\/span><\/div>\n
public<\/span> Object<\/span> evaluate<\/span>(<\/span>float<\/span> fraction<\/span>,<\/span> Object<\/span> startValue<\/span>,<\/span> Object<\/span> endValue<\/span>)<\/span> {<\/span><\/div>\n
String<\/span> startColor<\/span> =<\/span> (<\/span>String<\/span>)<\/span> startValue<\/span>;<\/span><\/div>\n
String<\/span> endColor<\/span> =<\/span> (<\/span>String<\/span>)<\/span> endValue<\/span>;<\/span><\/div>\n
int<\/span> startRed<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>startColor<\/span>.<\/span>substring<\/span>(<\/span>1<\/span>,<\/span> 3<\/span>)<\/span>,<\/span> 16<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> startGreen<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>startColor<\/span>.<\/span>substring<\/span>(<\/span>3<\/span>,<\/span> 5<\/span>)<\/span>,<\/span> 16<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> startBlue<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>startColor<\/span>.<\/span>substring<\/span>(<\/span>5<\/span>,<\/span> 7<\/span>)<\/span>,<\/span> 16<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> endRed<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>endColor<\/span>.<\/span>substring<\/span>(<\/span>1<\/span>,<\/span> 3<\/span>)<\/span>,<\/span> 16<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> endGreen<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>endColor<\/span>.<\/span>substring<\/span>(<\/span>3<\/span>,<\/span> 5<\/span>)<\/span>,<\/span> 16<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> endBlue<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>endColor<\/span>.<\/span>substring<\/span>(<\/span>5<\/span>,<\/span> 7<\/span>)<\/span>,<\/span> 16<\/span>)<\/span>;<\/span><\/div>\n
\/\/ \u521d\u59cb\u5316\u989c\u8272\u7684\u503c<\/span><\/div>\n
if<\/span> (<\/span>mCurrentRed<\/span> ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span><\/div>\n
mCurrentRed<\/span> =<\/span> startRed<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
if<\/span> (<\/span>mCurrentGreen<\/span> ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span><\/div>\n
mCurrentGreen<\/span> =<\/span> startGreen<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
if<\/span> (<\/span>mCurrentBlue<\/span> ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span><\/div>\n
mCurrentBlue<\/span> =<\/span> startBlue<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
\/\/ \u8ba1\u7b97\u521d\u59cb\u989c\u8272\u548c\u7ed3\u675f\u989c\u8272\u4e4b\u95f4\u7684\u5dee\u503c<\/span><\/div>\n
int<\/span> redDiff<\/span> =<\/span> Math<\/span>.<\/span>abs<\/span>(<\/span>startRed<\/span> -<\/span> endRed<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> greenDiff<\/span> =<\/span> Math<\/span>.<\/span>abs<\/span>(<\/span>startGreen<\/span> -<\/span> endGreen<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> blueDiff<\/span> =<\/span> Math<\/span>.<\/span>abs<\/span>(<\/span>startBlue<\/span> -<\/span> endBlue<\/span>)<\/span>;<\/span><\/div>\n
int<\/span> colorDiff<\/span> =<\/span> redDiff<\/span> +<\/span> greenDiff<\/span> +<\/span> blueDiff<\/span>;<\/span><\/div>\n
if<\/span> (<\/span>mCurrentRed<\/span> !=<\/span> endRed<\/span>)<\/span> {<\/span><\/div>\n
mCurrentRed<\/span> =<\/span> getCurrentColor<\/span>(<\/span>startRed<\/span>,<\/span> endRed<\/span>,<\/span> colorDiff<\/span>,<\/span> 0<\/span>,<\/span><\/div>\n
fraction<\/span>)<\/span>;<\/span><\/div>\n
}<\/span> else<\/span> if<\/span> (<\/span>mCurrentGreen<\/span> !=<\/span> endGreen<\/span>)<\/span> {<\/span><\/div>\n
mCurrentGreen<\/span> =<\/span> getCurrentColor<\/span>(<\/span>startGreen<\/span>,<\/span> endGreen<\/span>,<\/span> colorDiff<\/span>,<\/span><\/div>\n
redDiff<\/span>,<\/span> fraction<\/span>)<\/span>;<\/span><\/div>\n
}<\/span> else<\/span> if<\/span> (<\/span>mCurrentBlue<\/span> !=<\/span> endBlue<\/span>)<\/span> {<\/span><\/div>\n
mCurrentBlue<\/span> =<\/span> getCurrentColor<\/span>(<\/span>startBlue<\/span>,<\/span> endBlue<\/span>,<\/span> colorDiff<\/span>,<\/span><\/div>\n
redDiff<\/span> +<\/span> greenDiff<\/span>,<\/span> fraction<\/span>)<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
\/\/ \u5c06\u8ba1\u7b97\u51fa\u7684\u5f53\u524d\u989c\u8272\u7684\u503c\u7ec4\u88c5\u8fd4\u56de<\/span><\/div>\n
String<\/span> currentColor<\/span> =<\/span> \"#\"<\/span> +<\/span> getHexString<\/span>(<\/span>mCurrentRed<\/span>)<\/span><\/div>\n
+<\/span> getHexString<\/span>(<\/span>mCurrentGreen<\/span>)<\/span> +<\/span> getHexString<\/span>(<\/span>mCurrentBlue<\/span>)<\/span>;<\/span><\/div>\n
return<\/span> currentColor<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
<\/div>\n
\/**<\/span><\/div>\n
 * \u6839\u636efraction\u503c\u6765\u8ba1\u7b97\u5f53\u524d\u7684\u989c\u8272\u3002<\/span><\/div>\n
 *\/<\/span><\/div>\n
private<\/span> int<\/span> getCurrentColor<\/span>(<\/span>int<\/span> startColor<\/span>,<\/span> int<\/span> endColor<\/span>,<\/span> int<\/span> colorDiff<\/span>,<\/span><\/div>\n
int<\/span> offset<\/span>,<\/span> float<\/span> fraction<\/span>)<\/span> {<\/span><\/div>\n
int<\/span> currentColor<\/span>;<\/span><\/div>\n
if<\/span> (<\/span>startColor<\/span> ><\/span> endColor<\/span>)<\/span> {<\/span><\/div>\n
currentColor<\/span> =<\/span> (<\/span>int<\/span>)<\/span> (<\/span>startColor<\/span> -<\/span> (<\/span>fraction<\/span> *<\/span> colorDiff<\/span> -<\/span> offset<\/span>)<\/span>)<\/span>;<\/span><\/div>\n
if<\/span> (<\/span>currentColor<\/span> <<\/span> endColor<\/span>)<\/span> {<\/span><\/div>\n
currentColor<\/span> =<\/span> endColor<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
}<\/span> else<\/span> {<\/span><\/div>\n
currentColor<\/span> =<\/span> (<\/span>int<\/span>)<\/span> (<\/span>startColor<\/span> +<\/span> (<\/span>fraction<\/span> *<\/span> colorDiff<\/span> -<\/span> offset<\/span>)<\/span>)<\/span>;<\/span><\/div>\n
if<\/span> (<\/span>currentColor<\/span> ><\/span> endColor<\/span>)<\/span> {<\/span><\/div>\n
currentColor<\/span> =<\/span> endColor<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
}<\/span><\/div>\n
return<\/span> currentColor<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
<\/div>\n
\/**<\/span><\/div>\n
 * \u5c0610\u8fdb\u5236\u989c\u8272\u503c\u8f6c\u6362\u621016\u8fdb\u5236\u3002<\/span><\/div>\n
 *\/<\/span><\/div>\n
private<\/span> String<\/span> getHexString<\/span>(<\/span>int<\/span> value<\/span>)<\/span> {<\/span><\/div>\n
String<\/span> hexString<\/span> =<\/span> Integer<\/span>.<\/span>toHexString<\/span>(<\/span>value<\/span>)<\/span>;<\/span><\/div>\n
if<\/span> (<\/span>hexString<\/span>.<\/span>length<\/span>(<\/span>)<\/span> ==<\/span> 1<\/span>)<\/span> {<\/span><\/div>\n
hexString<\/span> =<\/span> \"0\"<\/span> +<\/span> hexString<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
return<\/span> hexString<\/span>;<\/span><\/div>\n
}<\/span><\/div>\n
<\/div>\n
}<\/span><\/div><\/code><\/pre>\n
\u8fd9\u5927\u6982\u662f\u6211\u4eec\u6574\u4e2a\u52a8\u753b\u64cd\u4f5c\u5f53\u4e2d\u6700\u590d\u6742\u7684\u4e00\u4e2a\u7c7b\u4e86\u3002\u6ca1\u9519\uff0c\u5c5e\u6027\u52a8\u753b\u7684\u9ad8\u7ea7\u7528\u6cd5\u4e2d\u6700\u6709\u6280\u672f\u542b\u91cf\u7684\u4e5f\u5c31\u662f\u5982\u4f55\u7f16\u5199\u51fa\u4e00\u4e2a\u5408\u9002\u7684TypeEvaluator\u3002\u597d\u5728\u521a\u624d\u6211\u4eec\u5df2\u7ecf\u7f16\u5199\u4e86\u4e00\u4e2aPointEvaluator\uff0c\u5bf9\u5b83\u7684\u57fa\u672c\u5de5\u4f5c\u539f\u7406\u5df2\u7ecf\u6709\u4e86\u4e86\u89e3\uff0c\u90a3\u4e48\u8fd9\u91cc\u6211\u4eec\u4e3b\u8981\u5b66\u4e60\u4e00\u4e0bColorEvaluator\u7684\u903b\u8f91\u6d41\u7a0b\u5427\u3002<\/p>\n
\u9996\u5148\u5728evaluate()\u65b9\u6cd5\u5f53\u4e2d\u83b7\u53d6\u5230\u989c\u8272\u7684\u521d\u59cb\u503c\u548c\u7ed3\u675f\u503c\uff0c\u5e76\u901a\u8fc7\u5b57\u7b26\u4e32\u622a\u53d6\u7684\u65b9\u5f0f\u5c06\u989c\u8272\u5206\u4e3aRGB\u4e09\u4e2a\u90e8\u5206\uff0c\u5e76\u5c06RGB\u7684\u503c\u8f6c\u6362\u6210\u5341\u8fdb\u5236\u6570\u5b57\uff0c\u90a3\u4e48\u6bcf\u4e2a\u989c\u8272\u7684\u53d6\u503c\u8303\u56f4\u5c31\u662f0-255\u3002\u63a5\u4e0b\u6765\u8ba1\u7b97\u4e00\u4e0b\u521d\u59cb\u989c\u8272\u503c\u5230\u7ed3\u675f\u989c\u8272\u503c\u4e4b\u95f4\u7684\u5dee\u503c\uff0c\u8fd9\u4e2a\u5dee\u503c\u5f88\u91cd\u8981\uff0c\u51b3\u5b9a\u7740\u989c\u8272\u53d8\u5316\u7684\u5feb\u6162\uff0c\u5982\u679c\u521d\u59cb\u989c\u8272\u503c\u548c\u7ed3\u675f\u989c\u8272\u503c\u5f88\u76f8\u8fd1\uff0c\u90a3\u4e48\u989c\u8272\u53d8\u5316\u5c31\u4f1a\u6bd4\u8f83\u7f13\u6162\uff0c\u800c\u5982\u679c\u989c\u8272\u503c\u76f8\u5dee\u5f88\u5927\uff0c\u6bd4\u5982\u8bf4\u4ece\u9ed1\u5230\u767d\uff0c\u90a3\u4e48\u5c31\u8981\u7ecf\u5386255*3\u8fd9\u4e2a\u5e45\u5ea6\u7684\u989c\u8272\u8fc7\u5ea6\uff0c\u53d8\u5316\u5c31\u4f1a\u975e\u5e38\u5feb\u3002<\/p>\n
\u90a3\u4e48\u63a7\u5236\u989c\u8272\u53d8\u5316\u7684\u901f\u5ea6\u662f\u901a\u8fc7getCurrentColor()\u8fd9\u4e2a\u65b9\u6cd5\u6765\u5b9e\u73b0\u7684\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4f1a\u6839\u636e\u5f53\u524d\u7684fraction\u503c\u6765\u8ba1\u7b97\u76ee\u524d\u5e94\u8be5\u8fc7\u5ea6\u5230\u4ec0\u4e48\u989c\u8272\uff0c\u5e76\u4e14\u8fd9\u91cc\u4f1a\u6839\u636e\u521d\u59cb\u548c\u7ed3\u675f\u7684\u989c\u8272\u5dee\u503c\u6765\u63a7\u5236\u53d8\u5316\u901f\u5ea6\uff0c\u6700\u7ec8\u5c06\u8ba1\u7b97\u51fa\u7684\u989c\u8272\u8fdb\u884c\u8fd4\u56de\u3002<\/p>\n
\u6700\u540e\uff0c\u7531\u4e8e\u6211\u4eec\u8ba1\u7b97\u51fa\u7684\u989c\u8272\u662f\u5341\u8fdb\u5236\u6570\u5b57\uff0c\u8fd9\u91cc\u8fd8\u9700\u8981\u8c03\u7528\u4e00\u4e0bgetHexString()\u65b9\u6cd5\u628a\u5b83\u4eec\u8f6c\u6362\u6210\u5341\u516d\u8fdb\u5236\u5b57\u7b26\u4e32\uff0c\u518d\u5c06RGB\u989c\u8272\u62fc\u88c5\u8d77\u6765\u4e4b\u540e\u4f5c\u4e3a\u6700\u7ec8\u7684\u7ed3\u679c\u8fd4\u56de\u3002<\/p>\n
\u597d\u4e86\uff0cColorEvaluator\u5199\u5b8c\u4e4b\u540e\u6211\u4eec\u5c31\u628a\u6700\u590d\u6742\u7684\u5de5\u4f5c\u5b8c\u6210\u4e86\uff0c\u5269\u4e0b\u7684\u5c31\u662f\u4e00\u4e9b\u7b80\u5355\u8c03\u7528\u7684\u95ee\u9898\u4e86\uff0c\u6bd4\u5982\u8bf4\u6211\u4eec\u60f3\u8981\u5b9e\u73b0\u4ece\u84dd\u8272\u5230\u7ea2\u8272\u7684\u52a8\u753b\u8fc7\u5ea6\uff0c\u5386\u65f65\u79d2\uff0c\u5c31\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n
ObjectAnimator <\/span>anim<\/span> =<\/span> ObjectAnimator<\/span>.<\/span>ofObject<\/span>(<\/span>myAnimView<\/span>,<\/span> \"color\"<\/span>,<\/span> new<\/span> ColorEvaluator<\/span>(<\/span>)<\/span>,<\/span><\/div>\n
\"#0000FF\"<\/span>,<\/span> \"#FF0000\"<\/span>)<\/span>;<\/span><\/div>\n
anim<\/span>.<\/span>setDuration<\/span>(<\/span>5000<\/span>)<\/span>;<\/span><\/div>\n
anim<\/span>.<\/span>start<\/span>(<\/span>)<\/span>;<\/span><\/div><\/code><\/pre>\n
\u7528\u6cd5\u975e\u5e38\u7b80\u5355\u6613\u61c2\uff0c\u76f8\u4fe1\u4e0d\u9700\u8981\u6211\u518d\u8fdb\u884c\u89e3\u91ca\u4e86\u3002<\/p>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u9700\u8981\u5c06\u4e0a\u9762\u4e00\u6bb5\u4ee3\u7801\u79fb\u5230MyAnimView\u7c7b\u5f53\u4e2d\uff0c\u8ba9\u5b83\u548c\u521a\u624d\u7684Point\u79fb\u52a8\u52a8\u753b\u53ef\u4ee5\u7ed3\u5408\u5230\u4e00\u8d77\u64ad\u653e\uff0c\u8fd9\u5c31\u8981\u501f\u52a9\u6211\u4eec\u5728\u4e0a\u7bc7\u6587\u7ae0\u5f53\u4e2d\u5b66\u5230\u7684\u7ec4\u5408\u52a8\u753b\u7684\u6280\u672f\u4e86\u3002\u4fee\u6539MyAnimView\u4e2d\u7684\u4ee3\u7801\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public<\/span> class<\/span> MyAnimView<\/span> extends<\/span> View<\/span> {<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>.<\/span>.<\/span>.<\/span><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>private<\/span> void<\/span> startAnimation<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Point <\/span>startPoint<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>RADIUS<\/span>,<\/span> RADIUS<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>Point <\/span>endPoint<\/span> =<\/span> new<\/span> Point<\/span>(<\/span>getWidth<\/span>(<\/span>)<\/span> -<\/span> RADIUS<\/span>,<\/span> getHeight<\/span>(<\/span>)<\/span> -<\/span> RADIUS<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>ValueAnimator <\/span>anim<\/span> =<\/span> ValueAnimator<\/span>.<\/span>ofObject<\/span>(<\/span>new<\/span> PointEvaluator<\/span>(<\/span>)<\/span>,<\/span> startPoint<\/span>,<\/span> endPoint<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>anim<\/span>.<\/span>addUpdateListener<\/span>(<\/span>new<\/span> ValueAnimator<\/span>.<\/span>AnimatorUpdateListener<\/span>(<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>@Override<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>public<\/span> void<\/span> onAnimationUpdate<\/span>(<\/span>ValueAnimator <\/span>animation<\/span>)<\/span> {<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>currentPoint<\/span> =<\/span> (<\/span>Point<\/span>)<\/span> animation<\/span>.<\/span>getAnimatedValue<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>invalidate<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>ObjectAnimator <\/span>anim2<\/span> =<\/span> ObjectAnimator<\/span>.<\/span>ofObject<\/span>(<\/span>this<\/span>,<\/span> \"color\"<\/span>,<\/span> new<\/span> ColorEvaluator<\/span>(<\/span>)<\/span>,<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\"#0000FF\"<\/span>,<\/span> \"#FF0000\"<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>AnimatorSet <\/span>animSet<\/span> =<\/span> new<\/span> AnimatorSet<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>animSet<\/span>.<\/span>play<\/span>(<\/span>anim<\/span>)<\/span>.<\/span>with<\/span>(<\/span>anim2<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>animSet<\/span>.<\/span>setDuration<\/span>(<\/span>5000<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>animSet<\/span>.<\/span>start<\/span>(<\/span>)<\/span>;<\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/div>\n
<\/div>\n
}<\/span><\/div><\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u5e76\u6ca1\u6709\u6539\u52a8\u592a\u591a\u7684\u4ee3\u7801\uff0c\u91cd\u70b9\u53ea\u662f\u4fee\u6539\u4e86startAnimation()\u65b9\u6cd5\u4e2d\u7684\u90e8\u5206\u5185\u5bb9\u3002\u8fd9\u91cc\u5148\u662f\u5c06\u989c\u8272\u8fc7\u5ea6\u7684\u4ee3\u7801\u903b\u8f91\u79fb\u52a8\u5230\u4e86startAnimation()\u65b9\u6cd5\u5f53\u4e2d\uff0c\u6ce8\u610f\u7531\u4e8e\u8fd9\u6bb5\u4ee3\u7801\u672c\u8eab\u5c31\u662f\u5728MyAnimView\u5f53\u4e2d\u6267\u884c\u7684\uff0c\u56e0\u6b64ObjectAnimator.ofObject()\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u76f4\u63a5\u4f20this\u5c31\u53ef\u4ee5\u4e86\u3002\u63a5\u7740\u6211\u4eec\u53c8\u521b\u5efa\u4e86\u4e00\u4e2aAnimatorSet\uff0c\u5e76\u628a\u4e24\u4e2a\u52a8\u753b\u8bbe\u7f6e\u6210\u540c\u65f6\u64ad\u653e\uff0c\u52a8\u753b\u65f6\u957f\u4e3a\u4e94\u79d2\uff0c\u6700\u540e\u542f\u52a8\u52a8\u753b\u3002\u73b0\u5728\u91cd\u65b0\u8fd0\u884c\u4e00\u4e0b\u4ee3\u7801\uff0c\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
\"\"<\/p>\n
OK\uff0c\u4f4d\u7f6e\u52a8\u753b\u548c\u989c\u8272\u52a8\u753b\u975e\u5e38\u878d\u6d3d\u7684\u7ed3\u5408\u5230\u4e00\u8d77\u4e86\uff0c\u770b\u4e0a\u53bb\u6548\u679c\u8fd8\u662f\u76f8\u5f53\u4e0d\u9519\u7684\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u628aObjectAnimator\u7684\u9ad8\u7ea7\u7528\u6cd5\u4e5f\u638c\u63e1\u4e86\u3002<\/p>\n
\u597d\u7684\uff0c\u901a\u8fc7\u672c\u7bc7\u6587\u7ae0\u7684\u5b66\u4e60\uff0c\u6211\u4eec\u5bf9\u5c5e\u6027\u52a8\u753b\u5df2\u7ecf\u6709\u4e86\u9887\u4e3a\u6df1\u523b\u7684\u8ba4\u8bc6\uff0c\u90a3\u4e48\u672c\u7bc7\u6587\u7ae0\u7684\u5185\u5bb9\u5230\u6b64\u4e3a\u6b62\uff0c\u4e0b\u7bc7\u6587\u7ae0\u5f53\u4e2d\u5c06\u4f1a\u4ecb\u7ecd\u66f4\u591a\u5173\u4e8e\u5c5e\u6027\u52a8\u753b\u7684\u5176\u5b83\u6280\u5de7,\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u9605\u8bfb\u00a0Android\u5c5e\u6027\u52a8\u753b\u5b8c\u5168\u89e3\u6790(\u4e0b)\uff0cInterpolator\u548cViewPropertyAnimator\u7684\u7528\u6cd5<\/strong>\u00a0\u3002<\/a><\/p>\n
\u539f\u6587\u51fa\u5904\uff1a guolin<\/a><\/p>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1aValueAnimator.ofObject \u914d TypeEvaluator \u80fd\u52a8\u4efb\u610f\u5bf9\u8c61\uff0cObjectAnimator \u518d\u7528\u81ea\u5b9a\u4e49 Evaluator \u505a\u989c\u8272\u7b49\u9ad8\u7ea7\u5c5e\u6027\u53d8\u5316\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
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