title: How to set duration time to play song in Android?
body: <p>I have song which duration is 15min. But I would like to play this song for 30 minutes. Also when the user will download PRO version of the application, the song should play for 2 hours. How can I set the time?</p>
  
  <p>I am new to Java and Android.</p>
  
  <p>Thanks for your help.</p>
  
  <pre><code>public class MainActivity extends Activity {
  
  Button start, stop;
  // Button btn_play, btn_stop, btn_pause;
  MediaPlayer mp;
  TextView display, comment;
  int length;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
  
      length = 0;
  
      start = (Button) findViewById(R.id.bStart);
      start.setOnClickListener(new View.OnClickListener() {
  
          @Override
          public void onClick(View v) {
  
              mp = MediaPlayer.create(MainActivity.this, R.raw.splahsound);
              mp.seekTo(length);
              mp.start();
  
              mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
  
                  @Override
                  public void onCompletion(MediaPlayer mp) {
  
                      mp.stop();
                      mp.reset();
                      mp.release(); // free up memory
                      mp = null;
                      length = 0;
                  }
  
              });
  
          }
      });
  
      stop = (Button) findViewById(R.id.bDur);
      stop.setOnClickListener(new View.OnClickListener() {
  
          @Override
          public void onClick(View v) {
  
              if (mp != null) {
                  try {
                      mp.stop();
                      mp.reset();
                      mp.release();
                      mp = null;
                      length = 0;
                  } catch (Exception e) {
                      Log.d("error", e.toString());
                  }
              }
          }
      });
  }
  
  }
  </code></pre>