title: DrawerLayout.openDrawer sometimes not working
body: <p>I have a <em>DrawerLayout</em> that usually works perfectly. I am using a button that opens the drawer by calling this method:</p>
  
  <pre><code>mDrawerLayout.openDrawer(mFragmentContainerView);
  </code></pre>
  
  <p>As I said, everything works fine but sometimes when the activity comes back from background the openDrawer method does nothing.</p>
  
  <p>By using</p>
  
  <pre><code>mDrawerLayout.isDrawerOpen(mFragmentContainerView);
  </code></pre>
  
  <p>before and after calling the <em>openDrawer</em> method, I can see it is always closed.</p>
  
  <p>I have spent several hours on this. What is going on? Any clue is appreciated!</p>