title: What is the "state_focused" state for a Button?
body: <p>I would like a Button background to remain a certain color after the button is clicked, and change colors again when some other button is pressed.  I thought this was the "state_focused" state. </p>
  
  <p>But the only two states I seem to have for my Button is pressed or not pressed.  </p>
  
  <p>Do I understand the state_focused state correctly, or is my StateListDrawable (see below) wrong?</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  
      &lt;item android:state_focused="true" android:state_pressed="false"&gt;&lt;shape&gt;
              &lt;solid android:color="#00ff00" /&gt;
          &lt;/shape&gt;&lt;/item&gt;
      &lt;item android:state_pressed="true"&gt;&lt;shape&gt;
              &lt;solid android:color="#ff0000" /&gt;
          &lt;/shape&gt;&lt;/item&gt;
      &lt;item&gt;&lt;shape&gt;
              &lt;solid android:color="#0000ff" /&gt;
          &lt;/shape&gt;&lt;/item&gt;
  
  &lt;/selector&gt;
  </code></pre>