title: How to change the app icon in Action Bar in SDK 22?
body: <p>Now I make app with SDK 22,but the Action Bar's app icon dispear.
  Here are my code.</p>
  
  <pre><code>&lt;resources&gt;
      &lt;!-- Base application theme. --&gt;
      &lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
          &lt;!-- Customize your theme here. --&gt;
          &lt;item name="android:actionBarStyle"&gt;@style/ActionBar&lt;/item&gt;
          &lt;item name="actionBarStyle"&gt;@style/ActionBar&lt;/item&gt;
          &lt;item name="actionOverflowButtonStyle"&gt;@style/overflowButton&lt;/item&gt;
      &lt;/style&gt;
      &lt;!--ActionBar--&gt;
      &lt;style name="ActionBar" parent="@style/Widget.AppCompat.Light.ActionBar.Solid.Inverse"&gt;
          &lt;item name="android:background"&gt;@color/bg&lt;/item&gt;
          &lt;item name="background"&gt;@color/bg&lt;/item&gt;
          &lt;item name="android:title"&gt;@string/test&lt;/item&gt;
          &lt;item name="title"&gt;@string/test&lt;/item&gt;
          &lt;item name="icon"&gt;@mipmap/ic_launcher&lt;/item&gt;   &lt;!-- here I want to show the app icon,but it can't--&gt;
          &lt;item name="android:icon"&gt;@mipmap/ic_launcher&lt;/item&gt;
      &lt;/style&gt;
      &lt;style name="overflowButton"&gt;
          &lt;item name="android:src"&gt;@mipmap/ic_add_black_48dp&lt;/item&gt;
          &lt;item name="android:showAsAction"&gt;&lt;/item&gt;
      &lt;/style&gt;
      &lt;style name="NoActionBarTheme" parent="Theme.AppCompat.Light.NoActionBar"&gt;&lt;/style&gt;
  &lt;/resources&gt;
  </code></pre>
  
  <p>I have try to solve it by android deceloper,but fail.I also try many other ways,it also fail.Please help me .</p>