title: how to clip circle in xml
body: <p>I need to create semi-circle in xml. I have came across clip, but I am unsure how to use it.</p>
  
  <p>This is my circle_view drawable:</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="#666666"/&gt;
  
  &lt;size
      android:width="120dp"
      android:height="120dp"/&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>And this is what I tried with clip:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;clip xmlns:android="http://schemas.android.com/apk/res/android"
    android:clipOrientation="vertical"
    android:drawable="@drawable/circle_view"
    android:gravity="top"/&gt;
  </code></pre>
  
  <p>But the result is nothing. How can I use clip properly in pure xml?</p>