title: How to Change a Button's Icon Programmatically?
body: <p>I already have the button:</p>
  
  <pre><code>&lt;Button 
  android:layout_height="wrap_content" 
  android:layout_width="fill_parent"
  android:drawableLeft="@drawable/empty"
  android:id="@+id/buttonMyText" 
  android:text="  myText" 
  android:textSize="20px" 
  android:gravity="left"&gt;
  &lt;/Button&gt;
  </code></pre>
  
  <p>I have the "empty" icon show on the button when the program starts.</p>
  
  <p>What I want to do is change the button's icon automatically from my code (low, medium and high) based on user inputs</p>
  
  <p>I tried:</p>
  
  <pre><code>Button myButton = bla... bla... bla...
  </code></pre>
  
  <p>But I cant figure out</p>
  
  <pre><code>myButton.(what?)
  </code></pre>