title: How to change the color of button after click?
body: <p>I create button with background color but when i click on it, it's not show anything.<br>
  I need to show different color on button after click because user need to know button is<br>
  Click.<br>
  I don't understand how to do this?<br>
  Give me suggestion.<br>
  here is my button code.  </p>
  
  <pre><code>&lt;Button android:textSize="15px"
        android:id="@+id/button9" 
        android:gravity="center|bottom" 
        android:textColor="@color/myWhiteColor" 
        android:drawableTop="@drawable/math"
        android:text="@string/HomePage_Math" 
        android:background="@color/myMaroonColor" 
        android:layout_width="54dp" 
        android:layout_height="wrap_content" &gt;&lt;/Button&gt;
  </code></pre>