title: Customize Actionbar's back button
body: <p><img src="https://i.stack.imgur.com/gEiQm.png" alt="enter image description here">   <img src="https://i.stack.imgur.com/6pJJI.png" alt="enter image description here"></p>
  
  <pre><code>&lt;style name="MyActionBar.ActionBarStyle" parent="@android:style/Widget.Holo.Light.ActionBar"&gt;
      &lt;item name="android:background"&gt;@drawable/button_style&lt;/item&gt;
      &lt;item name="android:titleTextStyle"&gt;@style/MyTheme.ActionBar.TitleTextStyle&lt;/item&gt;
  &lt;/style&gt; 
  </code></pre>
  
  <p>How can i customize the actibar's navigate up button. Actualy i want that it's colors changes when i click it. For example Whatsapp, when i click back button the button's background color happens blue.
  How can i do it?</p>