title: Change disabled button's text color
body: <p>I have a button like this:</p>
  
  <pre><code>&lt;Button
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:text="Hello"
      android:textColor="@color/primary"
      android:background="@drawable/button"
      /&gt;
  </code></pre>
  
  <p>The drawable <code>button.xml</code>:</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_enabled="false"
          android:drawable="@drawable/button_disabled" /&gt;
      &lt;item android:drawable="@drawable/button_default" /&gt;
  &lt;/selector&gt;
  </code></pre>
  
  <p>The drawable <code>button_disabled.xml</code>:</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="rectangle"&gt;
      &lt;solid android:color="@color/white"/&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>I also want to change the text color of the button when it's disabled. How do I specify a different text color for each state?</p>