Android之视频播发2

package cn.itcast.video;import java.io.File;import java.io.IOException;import android.app.Activity;import android.media.AudioManager;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.EditText;import android.widget.ImageButton;import android.widget.Toast;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	}}

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