title: Update selected state of navigation drawer after back press
body: <p>Whats the proper way to handle the selected state of the navigation drawer after back press?</p>
  
  <p>I have a navigation drawer with n entries (in a listview) like the SDK sample in Android Studio.
  When i click on the navigation drawer entries i want them to be added to the back stack, so i can move back to them.</p>
  
  <p>In onNavigationDrawerItemSelected(int pos) i have</p>
  
  <pre><code>        FragmentManager fragmentManager = getSupportFragmentManager();
          FragmentTransaction transaction = fragmentManager.beginTransaction();
          if (position == 0) {
              transaction.replace(R.id.container, new FragmentA());
          } else if (position == 1) {
              transaction.replace(R.id.container, new FragmentB());
          } else {
              transaction.replace(R.id.container, new FragmentC());
          }
          transaction.addToBackStack(null);
          transaction.commit();
  </code></pre>
  
  <p>When i click on the second entry in the drawer, B gets selected and replaces A. If i click the back button afterwards, Fragment A is shown again like it should, but B is still selected in the navigation drawer.</p>
  
  <p>How can i get the selection status of the drawer updated after pressing back? </p>
  
  <p>Somehow i need a call to  mDrawerListView.setItemChecked(position, true); or NavigationDrawerFragment.selectItem(int position). But to which position? How do i remeber it? </p>
  
  <p>Intercept with onBackPressed?</p>
  
  <pre><code>@Override
      public void onBackPressed() {}
  </code></pre>
  
  <p>But how do i know which fragment is active again? And to which position it corresponds.</p>
  
  <p>Is there some easy solution i am blind to see? It seems that using back in combination with the navigation drawer and updating the selection status is a standard pattern.</p>