title: Why i can't lock DrawerLayout with layout gravity
body: <p>I use DrawerLayout and recently i want to change gravity of listView in drawerLayout. But after i change gravity of listView to <code>android:layout_gravity="start|bottom"</code>from <code>android:layout_gravity="start"</code>, drawerLayout can't be lock to </p>
  
  <pre><code>mDrawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
  </code></pre>
  
  <p><strong>setDrawerLockMode() work with;</strong></p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/drawer_layout"
  android:layout_width="match_parent"
  android:layout_height="match_parent" &gt;
  
  &lt;RelativeLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  &lt;/RelativeLayout&gt;
  
  &lt;ListView
      android:id="@+id/drawer_list"
      android:layout_width="320dp"
      android:layout_height="match_parent"
      android:layout_gravity="start"
      android:background="#F3F3F4"
      android:choiceMode="singleChoice" &gt;
  &lt;/ListView&gt;
  </code></pre>
  
  <p></p>
  
  <p><strong>But it doesn't lock with;</strong></p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/drawer_layout"
  android:layout_width="match_parent"
  android:layout_height="match_parent" &gt;
  
  &lt;RelativeLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  &lt;/RelativeLayout&gt;
  
  &lt;ListView
      android:id="@+id/drawer_list"
      android:layout_width="320dp"
      android:layout_height="match_parent"
      android:layout_gravity="start|bottom"
      android:background="#F3F3F4"
      android:choiceMode="singleChoice" &gt;
  &lt;/ListView&gt;
  </code></pre>
  
  <p>`</p>
  
  <p>Any clues of why can't I use lock mode with other gravities?</p>
  
  <p>Thanks!</p>