回复内容:
今天下午各种Google之后终于实现了这个界面的各种效果。最终的界面这样的,基本实现了问题里面的所有元素。
代码在mutexliu/ZhihuAnswer · GitHub
画图的过程碰到的问题有:
1.画圆角。
<span class="n">Path</span> <span class="n">path</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Path</span><span class="o">();</span>
<span class="n">path</span><span class="o">.</span><span class="na">moveTo</span><span class="o">(</span><span class="n">left</span><span class="o">,</span> <span class="n">top</span><span class="o">);</span>
<span class="n">path</span><span class="o">.</span><span class="na">lineTo</span><span class="o">(</span><span class="n">right</span><span class="o">-</span><span class="n">radius</span><span class="o">,</span> <span class="n">top</span><span class="o">);</span>
<span class="n">path</span><span class="o">.</span><span class="na">quadTo</span><span class="o">(</span><span class="n">right</span><span class="o">,</span><span class="n">top</span><span class="o">,</span><span class="n">right</span><span class="o">,</span> <span class="n">top</span><span class="o">+</span><span class="n">radius</span><span class="o">);</span>
我写过一个控件lzyzsd/CircleProgress · GitHub

///12.25 23点

and

闲着没事忽然发现,QQ是酱紫的。。。
这种自定义UI组件算是从事Android开发必备的技能之一吧。多写多练很快就能掌握这里面的技巧,掌握了技巧之后遇到具体需求和设计的时候,就会很快做出成果。
努力做到举一反三,而不是拘泥于一两个特定的案例。


。。
具体实现楼上已经讲的很清楚了,还有源码
不过一定要动手实现一遍 我知道的只有自定义View = =
(对于程序猿来说。。。ui的实现就是多写代码) 正好最近在做类似的实现。
Canvas里面有专门画圆弧的函数:
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">drawArc</span> <span class="o">(</span><span class="n">RectF</span> <span class="n">oval</span><span class="o">,</span> <span class="kt">float</span> <span class="n">startAngle</span><span class="o">,</span> <span class="kt">float</span> <span class="n">sweepAngle</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">useCenter</span><span class="o">,</span> <span class="n">Paint</span> <span class="n">paint</span><span class="o">)</span>
circleprogress

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