Android Open Source - audio Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package edu.cs4730.AudioPlay;
//  w  ww. j  a  va  2 s . co  m
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;


/*
 * A simple app to demo how to play/pause/restart playing an audio
 * file from different places.
 */

public class MainActivity extends FragmentActivity {

  static final String AUDIO_PATH = "http://www.cs.uwyo.edu/~seker/courses/4730/example/MEEPMEEP.WAV";
  //"http://java.sun.com/products/java-media/mma/media/test-wav.wav";  //doesn't exist anymore.
  //"/sdcard/file.mp3"
  MediaPlayer mediaPlayer;
  int playbackPosition = 0;
  boolean localfile = false;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    if (savedInstanceState == null) {
      getSupportFragmentManager().beginTransaction()
      .add(R.id.container, new MainFragment()).commit();
    }
  }

  /*
   *  Make sure we clean up and release the media player in on pause (and onDestory too)
   * (non-Javadoc)
   * @see android.support.v4.app.FragmentActivity#onPause()
   */
  @Override protected void onPause() {
    KillMediaPlayer();
    super.onPause();
  }
  @Override protected void onDestroy() {
    KillMediaPlayer();
    super.onDestroy();
  }
  
  /*
   * simple code to pause the playback and store the current position.
   */
  void pauseAudio() {
    if (mediaPlayer != null && mediaPlayer.isPlaying()) {
      playbackPosition = mediaPlayer.getCurrentPosition();
      mediaPlayer.pause();
    }
  }
  
  
  /*
   * Load a file from the res/raw directory and play it.
   */
  
  void playAudioResource() {
    if (mediaPlayer == null || !localfile) {
      mediaPlayer =  MediaPlayer.create(getBaseContext(),R.raw.hmscream);
      localfile = true;
    } else { //play it again sam
      mediaPlayer.seekTo(0);
    }
    if (mediaPlayer.isPlaying()) {  //duh don't start it again.
      Toast.makeText(getBaseContext(), "I'm playing already", Toast.LENGTH_SHORT).show();
      return; 
    }
    //finally play!
    mediaPlayer.start();
  }

  /*
   * load a file from somewhere (including the internet) and play it.
   */
  void playAudio(String url) {
    if (mediaPlayer == null || localfile) {//firsttime or not the right file.
      localfile = false;
      mediaPlayer = new MediaPlayer();
      try {
        mediaPlayer.setDataSource(url);
        mediaPlayer.prepare();
      } catch (Exception e) {
        Toast.makeText(getBaseContext(), "Exception, not playing", 
            Toast.LENGTH_SHORT).show();
        System.out.println("Player exception is "+ e.getMessage());
        return;
      } 
    } else if (mediaPlayer.isPlaying()) {  //duh don't start it again.
      Toast.makeText(getBaseContext(), "I'm playing already", Toast.LENGTH_SHORT).show();
      return;    
    } else {  //play it at least one, reset and play again.
      mediaPlayer.seekTo(0);
    }
    mediaPlayer.start();

  }
  
  /*
   * should be called after the pauseAudio(), but setup has position set to zero so should work 
   * anyway.
   */
  void restartAudio() {
    if (mediaPlayer != null && !mediaPlayer.isPlaying()) {
      mediaPlayer.seekTo(playbackPosition);
      mediaPlayer.start();
    }

  }
  
  /*
   * make sure the player has been released.
   */
  void KillMediaPlayer() {
    if (mediaPlayer != null)
      mediaPlayer.release();
    mediaPlayer = null;
  }

  /**
   *  this just setups the buttons, the content of the code is above to play
   *  and pause/restart audio.
   */
  public class MainFragment extends Fragment {


    Button btnStartl, btnStart, btnPause, btnRestart;


    public MainFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
      View myView = inflater.inflate(R.layout.fragment_main, container, false);
      // play button, using local file.
      btnStart = (Button)myView.findViewById(R.id.btnPlayLocal);
      btnStart.setOnClickListener( new OnClickListener() {
        @Override public void onClick(View view) {
          playAudioResource();
        }
      });
      // play button, using remote file.
      btnStart = (Button)myView.findViewById(R.id.btnPlay);
      btnStart.setOnClickListener( new OnClickListener() {
        @Override public void onClick(View view) {
          playAudio(AUDIO_PATH);
        }
      });
      //pause the audio.
      btnPause = (Button)myView.findViewById(R.id.btnPause);
      btnPause.setOnClickListener( new OnClickListener() {
        @Override public void onClick(View view) {
          pauseAudio();
        }
      });
      //restart the audio.
      btnRestart = (Button)myView.findViewById(R.id.btnRestart);
      btnRestart.setOnClickListener( new OnClickListener() {
        @Override public void onClick(View view) {
          restartAudio();
        }
      });

      return myView;
    }
  }


}

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