Android視頻播放器關鍵代碼

import java.io.File;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Environment;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
    private EditText nameText;
    private String path;
    private MediaPlayer mediaPlayer;
    private SurfaceView surfaceView;
    private boolean pause;
    private int position;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mediaPlayer = new MediaPlayer();
    nameText = (EditText) this.findViewById(R.id.filename);
    surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView);
    //把輸送給surfaceView的視頻畫面，直接顯示到屏幕上,不要維持它自身的緩沖區
    surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    surfaceView.getHolder().setFixedSize(176, 144);
    surfaceView.getHolder().setKeepScreenOn(true);
    surfaceView.getHolder().addCallback(new SurfaceCallback());
}

private final class SurfaceCallback implements Callback{
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }
    public void surfaceCreated(SurfaceHolder holder) {
        if(position>0 && path!=null){
            play(position);
            position = 0;
        }
    }
    public void surfaceDestroyed(SurfaceHolder holder) {
        if(mediaPlayer.isPlaying()){
            position = mediaPlayer.getCurrentPosition();
            mediaPlayer.stop();
        }
    }
}

@Override
protected void onDestroy() {
    mediaPlayer.release();
    mediaPlayer = null;
    super.onDestroy();
}

public void mediaplay(View v){
    switch (v.getId()) {
    case R.id.playbutton:
        String filename = nameText.getText().toString();
        if(filename.startsWith("http")){
            path = filename;
            play(0);
        }else{
            File file = new File(Environment.getExternalStorageDirectory(), filename);
            if(file.exists()){
                path = file.getAbsolutePath();
                play(0);
            }else{
                path = null;
                Toast.makeText(this, R.string.filenoexsit, 1).show();
            }
        }

        break;

    case R.id.pausebutton:
        if(mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            pause = true;
        }else{
            if(pause){
                mediaPlayer.start();
                pause = false;
            }
        }
        break;

    case R.id.resetbutton:
        if(mediaPlayer.isPlaying()){
            mediaPlayer.seekTo(0);
        }else{
            if(path!=null){
                play(0);
            }
        }
        break;
    case R.id.stopbutton:
        if(mediaPlayer.isPlaying()){
            mediaPlayer.stop();
        }
        break;
    }
}

private void play(int position) {
    try {
        mediaPlayer.reset();
        mediaPlayer.setDataSource(path);
        mediaPlayer.setDisplay(surfaceView.getHolder());
        mediaPlayer.prepare();//緩沖
        mediaPlayer.setOnPreparedListener(new PrepareListener(position));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private final class PrepareListener implements OnPreparedListener{
    private int position;

    public PrepareListener(int position) {
         this.position = position;
    }

    public void onPrepared(MediaPlayer mp) {
        mediaPlayer.start();//播放視頻
        if(position>0) mediaPlayer.seekTo(position);
    }
}

}</pre>