title: Show the three lines at navigation drawer
body: <p>I recently updated my app to use navigation drawer in 2 activities (instead of only one, as it used to be). For this, made an DrawerActivity parent class, and I extend this class on the two activities I want to use it on. The problem is, instead of showing the three lines symbol, it shows the back arrow symbol. Previously, when I used only in the main activity the navigation drawer, it was shown as it should (with the three lines), like this:</p>
  
  <p><img src="https://i.stack.imgur.com/YuxGn.png" alt="http://s17.postimg.org/y66pxf50v/JEk_FM.png"></p>
  
  <p>Here's the code that I use for this:</p>
  
  <pre><code>drawerListener = new ActionBarDrawerToggle(this, drawerLayout,
              R.drawable.ic_navigation_drawer, R.string.navigation_drawer_open,
              R.string.navigation_drawer_close) {
          @Override
          public void onDrawerClosed(View drawerView) {
              super.onDrawerClosed(drawerView);
          }
  
          @Override
          public void onDrawerOpened(View drawerView) {
              super.onDrawerOpened(drawerView);
          }
  
          @Override
          public void onDrawerSlide(View drawerView, float slideOffset) {
          }
      }
      getActionBar().setHomeButtonEnabled(true);
      getActionBar().setDisplayHomeAsUpEnabled(true);
  </code></pre>
  
  <p>Any ideas why it shows the back button, instead of the three lines ? Thank you.</p>