title: Show Effect on focus/click on Android Buttons
body: <p>I would like to adding some effects like color change to my android button when user focus/click the button</p>
  
  <p>My android button layout is here :</p>
  
  <pre><code>&lt;Button
      android:id="@+id/btnUpload"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="center_horizontal"
      android:background="@color/btn_bg"
  
      android:text="தகவல் அனுப்புக"
      android:textColor="@color/white"
      android:padding="20dp"
      android:margin="20dp"
      android:layout_alignParentBottom="true" /&gt;
  </code></pre>