title: Android navigation drawer won't open
body: <p>I've checked other similar posts and can't find a solution. I have had trouble with a null pointer upon calling <code>getActionBar()</code>, I seemed to have solved that by using <code>getSupportActionBar()</code>. My app now runs but my nav drawer does not open. </p>
  
  <p>Here is my base activity, all other activities extend this BaseActivity:</p>
  
  <pre><code>* This activity will add Navigation Drawer for our application and all the code related to navigation drawer.
   * We are going to extend all our other activites from this BaseActivity so that every activity will have Navigation Drawer in it.
   * This activity layout contain one frame layout in which we will add our child activity layout.  
   */
  </code></pre>
  
  <p>Here is the XML for BaseActivity's view:</p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/drawer_layout"
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  
      &lt;FrameLayout
          android:id="@+id/content_frame"
          android:theme="@android:style/Theme.WithActionBar"
          android:layout_width="match_parent"
          android:layout_height="match_parent" /&gt;
  
      &lt;ListView
          android:id="@+id/left_drawer"
          android:layout_width="240dp"
          android:layout_height="match_parent"
          android:layout_gravity="start"
          android:background="#888888"
          android:choiceMode="singleChoice"
          android:divider="@android:color/transparent"
          android:dividerHeight="0dp" /&gt;
  
  &lt;/android.support.v4.widget.DrawerLayout&gt;
  </code></pre>
  
  <p>My minSdkVersion is 16 and I'm using the standard <code>@style/AppTheme</code> which uses Theme.AppCompat.Light as its parent.</p>
  
  <p>The code runs fine with no errors but the navigation drawer just won't open.</p>
  
  <p>Any help is greatly appreciated, thanks in advance!</p>