title: Android prepare media player causes UI blocking
body: <p>Hi I am developing android application in which I have one simple activity which contains button to start new activity. new activity contain surface view to show video. 
  I know that prepare media player work on main thread that's why I use prepareAsync. SO my problem is like this. I click on activity stat button which start new activity and start loading video. If I click back before video start i.e. media player start() it come back to previous activity. But UI of that activity is not active for some time. That mean I am not able to click on start button for some time. After some time it become active again. Is there any one facing same problem. My code looks like :</p>
  
  <pre><code>@Override
      public void surfaceCreated(SurfaceHolder arg0) {
          // TODO Auto-generated method stub
          Log.i("FFFFFFFFFFFFFFFFFFF  ", "FFFFFFFFFFFFFFFFFFF ");
  
           mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
           mediaPlayer.setDisplay(surfaceHolder);
  
           try {
               mediaPlayer.setDataSource(getApplicationContext(), targetUri);
               mediaPlayer.prepareAsync();
               //mediaPlayer.prepare();    
           } catch (IllegalArgumentException e) {
               e.printStackTrace();
           } catch (IllegalStateException e) {
               e.printStackTrace();
           } catch (IOException e) {
               e.printStackTrace();
           }
  
           mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
              @Override
              public void onPrepared(MediaPlayer mp) {
                  // TODO Auto-generated method stub
  
                  mediaPlayer.start();
  
              }
              });
      } 
  </code></pre>
  
  <p>How to avoid this situation. Am I doing some thing wrong. Need help. Thank you.</p>