title: How to set a custom back button in ActionBar?
body: <p>I am creating an ActionBar (SupportActionBar, more precisely) this way:</p>
  
  <pre><code>android.support.v7.app.ActionBar actionBar=getSupportActionBar();
      actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
      actionBar.setDisplayShowTitleEnabled(true);
      actionBar.setHomeButtonEnabled(true);
      actionBar.setDisplayHomeAsUpEnabled(true);
      //actionBar.setDisplayOptions(actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_SHOW_TITLE););
      actionBar.setIcon(R.drawable.ic_drawer);
      actionBar.setTitle(mTitle);
  </code></pre>
  
  <p>This way, I get a button in my action bar which, once clicked, does what I want it to do. But, it displays an arrow pointing to the left. I would like to display another drawable, so I uncomment the setDisplayOptions line, and the icon I want is displayed. But, the button is no longer clickable.</p>
  
  <p>How could I set my drawable to the button, and maintaining it clickable?</p>