Android开发实现的简单媒体播放器功能示例

本文实例讲述了Android开发实现的简单媒体播放器功能。分享给大家供大家参考，具体如下：

一、概述：

因为播放视频需要很大的内存，所以必须使用surfaceview ，

surfaceview 里实现了双缓冲的功能，

二、全部代码：

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;
    }
  }
}

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希望本文所述对大家Android程序设计有所帮助。