title: Disable hamburger to back arrow animation on Toolbar
body: <p>It's very easy to implement <code>Toolbar</code> with hamburger to back arrow animation. In my opinion this animation is pointless because as per material design spec navigation drawer covers the <code>Toolbar</code> when opened. My question is how to properly disable this animation and show either hamburger or back arrow using <code>getSupportActionBar().setDisplayHomeAsUpEnabled(true);</code></p>
  
  <p>This is how I did it, but it looks like a dirty hack:</p>
  
  <pre><code>mDrawerToggle.setDrawerIndicatorEnabled(false);
  
  if (showHomeAsUp) {
      mDrawerToggle.setHomeAsUpIndicator(R.drawable.lib_ic_arrow_back_light);
      mDrawerToggle.setToolbarNavigationClickListener(view -&gt; finish());
  } else {
      mDrawerToggle.setHomeAsUpIndicator(R.drawable.lib_ic_menu_light);
      mDrawerToggle.setToolbarNavigationClickListener(view -&gt; toggleDrawer());
  }
  </code></pre>
  
  <p>Any clues how this should be properly implemented to use just <code>setDisplayHomeAsUpEnabled</code> to switch between hamburger and back arrow icons?</p>