Android开发实现的简单媒体播放器功能示例

/**
 * @描述     使用surfaceview 创建视频
 * @项目名称   App_Basic
 * @包名     com.example.basic.media
 * @类名     MediaPlayerActivity
 * @author   chenlin
 * @date    2013-3-25 上午7:36:32
 * @version   1.0
 */
public class MediaPlayerActivity extends BaseActivity {
  private MediaPlayer mPlayer;
  private Button mBtnPlay;
  private Button mBtnPause;
  private SurfaceView mSurfaceView;
  private int mCurrentPosition;
  private SeekBar seekBar;
  private boolean isPlaying;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mSurfaceView = new SurfaceView(this);
    seekBar = new SeekBar(this);
    seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
      @Override
      public void onStopTrackingTouch(SeekBar seekBar) {
        int progress = seekBar.getProgress();
        if (mPlayer != null && isPlaying) {
          mPlayer.seekTo(progress);
        }
      }
      @Override
      public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
      }
      @Override
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        // TODO Auto-generated method stub
      }
    });
    mSurfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    mSurfaceView.getHolder().addCallback(new Callback() {
      @Override
      public void surfaceDestroyed(SurfaceHolder holder) {
        if (mPlayer!= null && mPlayer.isPlaying()) {
          mCurrentPosition = mPlayer.getCurrentPosition();
          stop();
        }
      }
      @Override
      public void surfaceCreated(SurfaceHolder holder) {
        if (mCurrentPosition > 0) {
          play(mCurrentPosition);
        }
      }
      @Override
      public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // TODO Auto-generated method stub
      }
    });
  }
  public void play(final int currentPosition){
    try {
      mPlayer = new MediaPlayer();
      mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
      Uri myUri = Uri.fromFile(new File("sdcard/mp3/1.mp3"));
      mPlayer.setDataSource(getApplicationContext(), myUri);
      mPlayer.setLooping(true);
      mPlayer.setDisplay(mSurfaceView.getHolder());
      mPlayer.prepareAsync();
      //mPlayer.prepare();
      mBtnPlay.setEnabled(false);
      mPlayer.setOnCompletionListener(new OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
          mBtnPlay.setEnabled(true);
          mPlayer.release();
        }
      });
      mPlayer.setOnErrorListener(new OnErrorListener() {
        @Override
        public boolean onError(MediaPlayer mp, int what, int extra) {
          mBtnPlay.setEnabled(true);
          mPlayer.release();
          isPlaying = false;
          return false;
        }
      });
      mPlayer.setOnPreparedListener(new OnPreparedListener() {
        public void onPrepared(MediaPlayer mp) {
          mPlayer.start();
          mPlayer.seekTo(currentPosition);
          seekBar.setMax(mPlayer.getDuration());
          new Thread(new Runnable() {
            @Override
            public void run() {
              isPlaying = true;
              while(isPlaying){
                seekBar.setProgress(mPlayer.getCurrentPosition());
                SystemClock.sleep(500);
              }
            }
          });
        }
      });
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  public void pause(){
    if ("接续".equals(mBtnPause.getText().toString())) {
      mBtnPause.setText("暂停");
      mPlayer.start();
      return;
    }
    if (mPlayer != null && mPlayer.isPlaying()) {
      mPlayer.pause();
      mBtnPause.setText("继续");
      return;
    }
  }
  public void reset(){
    if (mPlayer != null && mPlayer.isPlaying()) {
      mPlayer.seekTo(0);
      return;
    }
    play(0);
  }
  public void stop(){
    if (mPlayer != null && mPlayer.isPlaying()) {
      mPlayer.stop();
      mPlayer.release();
      mPlayer = null;
      mBtnPlay.setEnabled(true);
      isPlaying = false;
    }
  }
}