title: Background transparency in libgdx
body: <p>How can I make background of screen transparent if I use libgdx in Android?</p>
  
  <p>The code I tried to use doesn't work.</p>
  
  <pre><code>Gdx.gl.glClearColor( 0, 0, 0, 0 );
  Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT );
  </code></pre>