title: ToolBar navigation button
body: <p>This is my Toolbar:
  <img src="https://i.stack.imgur.com/xvtFZ.png" alt="my toolbar"></p>
  
  <p>And this is Gmail app Toolbar:
  <img src="https://i.stack.imgur.com/M9Se8.png" alt="gmail toolbar"></p>
  
  <p>I want to have the button which open the navigation drawer that the Gmail app has.</p>
  
  <p>How can I achive that?</p>
  
  <p>This is my ToolBar:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.v7.widget.Toolbar
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:id="@+id/toolbar"
      app:theme="@style/ThemeOverlay.AppCompat.ActionBar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:minHeight="@dimen/abc_action_bar_default_height_material"
      android:background="#EDAA00" /&gt;
  </code></pre>
  
  <p>This is my theme of the app:</p>
  
  <pre><code>&lt;style name="noActionBar" parent="Theme.AppCompat.Light.NoActionBar"/&gt;
  </code></pre>
  
  <p>This is my code that create the toolbar:</p>
  
  <pre><code>Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
          toolbar.setTitleTextColor(Color.WHITE);
          setSupportActionBar(toolbar);
          getSupportActionBar().setDisplayHomeAsUpEnabled(true);
          getSupportActionBar().setHomeButtonEnabled(true);
  </code></pre>
  
  <p>...</p>
  
  <pre><code> mDrawerToggle = new ActionBarDrawerToggle(
                  getActivity(),                    /* host Activity */
                  mDrawerLayout,                    /* DrawerLayout object */
                  R.drawable.ic_drawer,             /* nav drawer image to replace 'Up' caret */
                  R.string.navigation_drawer_open,  /* "open drawer" description for accessibility */
                  R.string.navigation_drawer_close  /* "close drawer" description for accessibility */
          )
  </code></pre>
  
  <p>Thanks in advance!</p>