title: Home button is not shown in action bar
body: <p>This is first time i make a new apps since the time Action Bar was enabled in android 2.x.x by using android support ver7. Today i just install Android Studio (Because eclipse is no longer official tools for android development) and using it to make my apps. I notice that Home button is not show on the action bar when i run the app.</p>
  
  <p>I already have these line in my code :</p>
  
  <pre><code>    mainActionBar = getSupportActionBar();
      mainActionBar.setCustomView(R.layout.search_bar);
      mainActionBar.setHomeButtonEnabled(true);
      mainActionBar.setDisplayShowCustomEnabled(true);
      mainActionBar.setDisplayOptions(DISPLAY_SHOW_HOME| DISPLAY_SHOW_TITLE| DISPLAY_SHOW_CUSTOM);
  </code></pre>
  
  <p>But Home button is not display on the corner of the action bar.
  Then i try too add these line:</p>
  
  <pre><code>    mainActionBar.setDisplayShowHomeEnabled(true);
      mainActionBar.setIcon(R.drawable.ic_launcher);
  </code></pre>
  
  <p>The icon launcher is display but i can press on it.</p>
  
  <p>Is there anybody can help me to solve it ? In my older apps, I used ActionbarSherlock and everything worked fine.
  Here is the code in my older apps:</p>
  
  <pre><code>    _action = getSupportActionBar();
      _action.setCustomView(R.layout.search_bar);
      _action.setDisplayShowCustomEnabled(true);
      _action.setHomeButtonEnabled(true);
      _action.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_SHOW_TITLE | ActionBar.DISPLAY_SHOW_CUSTOM);
  </code></pre>