title: How to create transparent semicircle?
body: <p>I want to create this effect.TextView with transparent semicircle as backgound .  <img src="https://i.stack.imgur.com/z4nN7.png" alt="enter image description here">
  I tried add drawable as background.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" &gt;
      &lt;solid android:color="#00000000" /&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>also i tried this <a href="https://stackoverflow.com/questions/15962745/draw-a-semicircle-in-the-background-of-a-view">stackoverflow similar question</a> ,but it doesn't work for me.
  Can anyone help me?</p>