title: Status bar transparency doesn't work
body: <p>I am trying to make status bar transparent in my application using this code:</p>
  
  <pre><code>getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
  getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
  getWindow().setStatusBarColor(Color.TRANSPARENT);
  </code></pre>
  
  <p>But it doesn't work. Status bar just change a color and became grey, not transparent. Where is my mistake? How to make status bar transparent?</p>