title: Animate drawer icon into arrow on setDisplayHomeAsUpEnabled?
body: <p>I'm using setDisplayHomeAsUpEnabled in order to show the arrow instead of the drawer "burger" icon but it's not getting animated or anything. Instead it shows the arrow drawable instantaneously.</p>
  
  <p>Home screen: <strong>(Album 1)</strong></p>
  
  <p>When you tap a movie: <strong>(Album 2)</strong></p>
  
  <p>The thing is, the icon does the animation just fine when I slide the drawer, which makes me think that maybe I'm not supposed to use setDisplayHomeAsUpEnabled for this: <strong>(Album 3)</strong></p>
  
  <p><strong>Album:</strong> <a href="http://imgur.com/a/LkXbh">http://imgur.com/a/LkXbh</a></p>
  
  <p>Here's my drawer toggle code:
  </p>
  
  <pre><code>    Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
      setSupportActionBar(toolbar);
  
      drawerAdapter = new DrawerAdapter(this, App.getNavItems(), getSupportFragmentManager());
      drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
      drawerList = (ExpandableListView) findViewById(R.id.left_drawer);
  
      // Set onGroupClick and onChildClick
      drawerAdapter.setClickEvents(MainActivity.this, drawerLayout, drawerList);
      drawerList.setAdapter(drawerAdapter);
  
      ActionBarDrawerToggle toolbarDrawerToggle = new ActionBarDrawerToggle(
              this,                 
              drawerLayout,        
              toolbar,             
              R.string.drawer_open, 
              R.string.drawer_close 
      ) {
  
          public void onDrawerClosed(View view) {
              super.onDrawerClosed(view);
              invalidateOptionsMenu();
          }
  
          public void onDrawerOpened(View view) {
              super.onDrawerOpened(view);
              invalidateOptionsMenu();
          }
      };
      drawerLayout.setDrawerListener(toolbarDrawerToggle);
      toolbarDrawerToggle.syncState();
  </code></pre>
  
  <p><strong>EDIT:</strong> I want the animation not when opening the drawer, that works already. 
  I would like to manually trigger the animation when I load a specific fragment. I may not have explained myself correctly.</p>