Android使用SurfaceView实现视频播放

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{@Overridepublic void surfaceCreated(SurfaceHolder holder) {if(position>0 && filename!=null){try {play();mediaPlayer.seekTo(position);position = 0;} catch (IOException e) {Log.e(TAG, e.toString());}}}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {if(mediaPlayer.isPlaying()){position = mediaPlayer.getCurrentPosition();mediaPlayer.stop();}}        }private final class ButtonClickListener implements View.OnClickListener{@Overridepublic 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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