title: View is not conquering full screen
body: <p>i want to implement full screen mode for activity.</p>
  
  <p>so, i have used first:</p>
  
  <pre><code>super.onCreate(savedInstanceState);
  
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                       WindowManager.LayoutParams.FLAG_FULLSCREEN);
  
  setContentView(R.layout.selector);
  </code></pre>
  
  <p>but that doesn't work. so i have deleted that code and used</p>
  
  <pre><code>&lt;style name="Theme.CustomizedFullScreen" parent="android:Theme"&gt;
      &lt;item name="android:windowFullscreen"&gt;true&lt;/item&gt;
      &lt;item name="android:windowNoTitle"&gt;true&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>this code. But, for both code, the result is:</p>
  
  <p>(Before implementing the code)
  <img src="https://i.stack.imgur.com/OtafR.png" alt="Before implementing the code"></p>
  
  <p>(After implementing the code)
  <img src="https://i.stack.imgur.com/WjL94.png" alt="After implementing the code"></p>
  
  <p>so, what's wrong?</p>