android之视频播放器

 

public class PlayActivity extends Activity {
 private static final String TAG = "PlayActivity";
    private EditText filenameText;
    private MediaPlayer mediaPlayer;
    private SurfaceView surfaceView;
    private String filename;
    private int position;
   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        filenameText = (EditText)this.findViewById(R.id.filename);
       
        surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView);
        surfaceView.getHolder().setFixedSize(176, 144);//设置分辨率
        surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        surfaceView.getHolder().addCallback(new SurfaceCallback());

        mediaPlayer = new MediaPlayer();
        ButtonClickListener listener = new ButtonClickListener();
        ImageButton playButton = (ImageButton)this.findViewById(R.id.play);
        ImageButton pauseButton = (ImageButton)this.findViewById(R.id.pause);
        ImageButton resetButton = (ImageButton)this.findViewById(R.id.reset);
        ImageButton stopButton = (ImageButton) this.findViewById(R.id.stop);
        playButton.setOnClickListener(listener);
        pauseButton.setOnClickListener(listener);
        resetButton.setOnClickListener(listener);
        stopButton.setOnClickListener(listener);
    }
   
    private final class SurfaceCallback implements SurfaceHolder.Callback{
  @Override
  public void surfaceCreated(SurfaceHolder holder) {
   if(position>0 && filename!=null){
    try {
     play();
     mediaPlayer.seekTo(position);
     position = 0;
    } catch (IOException e) {
     Log.e(TAG, e.toString());
    }
   }
  }
  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width,
    int height) {
  }
  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
   if(mediaPlayer.isPlaying()){
    position = mediaPlayer.getCurrentPosition();
    mediaPlayer.stop();
   }
  }     
    }

 private final class ButtonClickListener implements View.OnClickListener{
  @Override
  public void onClick(View v) {
   if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
    Toast.makeText(PlayActivity.this, R.string.sdcarderror, 1).show();
    return;
   }
   filename = filenameText.getText().toString();
   try {
    switch (v.getId()) {
    case R.id.play:
     play();     
     break;

    case R.id.pause:
     if(mediaPlayer.isPlaying()){
      mediaPlayer.pause();
     }else{
      mediaPlayer.start();
     }
     break;
    case R.id.reset:
     if(mediaPlayer.isPlaying()){
      mediaPlayer.seekTo(0);
     }else{
      play();
     }
     break;
    case R.id.stop:
     if(mediaPlayer.isPlaying()) mediaPlayer.stop();
     break;
    }
   } catch (Exception e) {
    Log.e(TAG, e.toString());
   }
  }
    }

 private void play() throws IOException {
  File videoFile = new File(Environment.getExternalStorageDirectory(), filename);
  mediaPlayer.reset();//重置为初始状态
  mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
  /* 设置Video影片以SurfaceHolder播放 */
  mediaPlayer.setDisplay(surfaceView.getHolder());
  mediaPlayer.setDataSource(videoFile.getAbsolutePath());
  mediaPlayer.prepare();//缓冲    
  mediaPlayer.start();//播放
 }
}