title: SYSTEM_UI_FLAG_HIDE_NAVIGATION not working on Android 4.0.3
body: <p>I'm trying to hide navigation bar (back, home buttons) on an Android 4.0.3 tablet. </p>
  
  <p>I've tested this code on android 4.3 emulator and it's working:</p>
  
  <pre><code>@Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      View v = getWindow().getDecorView();
      v.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
  }
  </code></pre>
  
  <p>But it's doing nothing on my tablet !</p>
  
  <p>I'm not sure if <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> should work on 4.0.3 but I see that 
  tablet's default video player on 4.0.3 is hiding the navigation bar and the behavior looks like it is using <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code>.</p>
  
  <p>Is this code supposed to work on 4.0.3?</p>
  
  <p>If not is there some alternative that I could use?</p>