title: Screen goes black when Navigation Drawer is added
body: <p>I have a Problem with my application. After i done this:
  <a href="https://stackoverflow.com/questions/26476837/android-5-0-material-design-style-navigation-drawer-for-kitkat">Android 5.0 material design style navigation drawer for KitKat</a></p>
  
  <p>My app does not Start. After Start, the screen goes black. If I remove the fragment-tag from layout file, it works. I have the same structure like in the tutorial. I tested on emulator and on an Galaxy S2. </p>
  
  <p>Here some code:
  layout/activity_main.xml</p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout
  android:id="@+id/drawer_layout"
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#FFFFFF"
  tools:context=".MainActivity"&gt;
  
  &lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"
      &gt;
  
      &lt;android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="56dp"
          android:background="?attr/colorPrimary"
          android:minHeight="?attr/actionBarSize"/&gt;
  
      &lt;RelativeLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"&gt;
  
          &lt;FrameLayout
              android:id="@+id/content_frame"
              android:layout_width="match_parent"
              android:layout_height="match_parent"/&gt;
  
      &lt;/RelativeLayout&gt;
  
  &lt;/LinearLayout&gt;
  
  &lt;fragment
      android:id="@+id/left_drawer"
      android:name="example.fragments.NavigationDrawerFragment"
      android:layout_width="@dimen/navigation_drawer_width"
      android:layout_height="match_parent"
      android:layout_gravity="start"
      tools:layout="@layout/fragment_navigation_drawer"
      /&gt;
  </code></pre>
  
  <p></p>
  
  <p>MainActivity:</p>
  
  <pre><code>@Override
  protected void onCreate(final Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      this.setContentView(R.layout.activity_main);
  
      this.mNavigationDrawerFragment = (NavigationDrawerFragment) this.getSupportFragmentManager().findFragmentById(R.id.left_drawer);
      if (this.mNavigationDrawerFragment == null) {
          this.mNavigationDrawerFragment = new NavigationDrawerFragment();
      }
  
      // Set up the drawer.
      this.mNavigationDrawerFragment.setUp(R.id.left_drawer, (DrawerLayout) this.findViewById(R.id.drawer_layout));
  
  }
  </code></pre>
  
  <p>If I remove:</p>
  
  <pre><code>&lt;fragment
      android:id="@+id/left_drawer"
      android:name="example.fragments.NavigationDrawerFragment"
      android:layout_width="@dimen/navigation_drawer_width"
      android:layout_height="match_parent"
      android:layout_gravity="start"
      tools:layout="@layout/fragment_navigation_drawer"
      /&gt;
  </code></pre>
  
  <p>Then it works :-/</p>