title: Android: correct usage of PrepareAsync() in media player activity
body: <p>I'm following <a href="http://developer.android.com/guide/topics/media/mediaplayer.html" rel="noreferrer">this</a> tutorial, but the usage of prepareAsync is not clear and my code does not output any audio. I'm using prepareAsync() because my mp3 is online and I don't want to lock the activity during media player preparing. Could you explain basic usage of prepareAsync?</p>
  
  <pre><code>package com.example.simplemediaplayer.app;
  
  import android.media.AudioManager;
  import android.media.MediaPlayer;
  import android.support.v7.app.ActionBarActivity;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.widget.Toast;
  
  import java.io.IOException;
  
  
  public class MediaPlayerActivity extends ActionBarActivity implements MediaPlayer.OnPreparedListener {
  
      private static final String TAG = "tag";
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_media_player);
  
          String url = "http://www.brothershouse.narod.ru/music/pepe_link_-_guitar_vibe_113_club_mix.mp3"; // your URL here
          MediaPlayer myMediaPlayer = new MediaPlayer();
          myMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
          try {
              myMediaPlayer.setDataSource(url);
              myMediaPlayer.prepareAsync(); // might take long! (for buffering, etc)
  
          } catch (IOException e) {
              Toast.makeText(this, "mp3 not found", Toast.LENGTH_SHORT).show();
              e.printStackTrace();
          }
  
      }
  
      /** Called when MediaPlayer is ready */
      @Override
      public void onPrepared(MediaPlayer player) {
          player.start();
      }
  
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.media_player, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
          if (id == R.id.action_settings) {
              return true;
          }
          return super.onOptionsItemSelected(item);
      }
  }
  </code></pre>