android 简易视频播放器的实现

public class VideoActivity extends Activity {

private static final String TAG = "VideoActivity";

private EditText filenameText;

private SurfaceView surfaceView;

private MediaPlayer mediaPlayer;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

ButtonClickListener listener = new ButtonClickListener();

ImageButton playButton = (ImageButton) this.findViewById(R.id.play);

playButton.setOnClickListener(listener);

ImageButton pauseButton = (ImageButton) this.findViewById(R.id.pause);

pauseButton.setOnClickListener(listener);

ImageButton resetButton = (ImageButton) this.findViewById(R.id.reset);

resetButton.setOnClickListener(listener);

ImageButton stopButton = (ImageButton) this.findViewById(R.id.stop);

stopButton.setOnClickListener(listener);

// 重点这个地方需要设置回调函数 继承Callback 类实现三个方法

surfaceView.getHolder().addCallback(new myCallback());

filenameText = (EditText) this.findViewById(R.id.filename);

surfaceView = (SurfaceView) findViewById(R.id.surfaceView);

surfaceView.getHolder() .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

// 设置这个大小

surfaceView.getHolder().setFixedSize(176, 144);

mediaPlayer = new MediaPlayer();

}

private class myCallback implements android.view.SurfaceHolder.Callback
{

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

// TODO Auto-generated method stub

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

// TODO Auto-generated method stub

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

// TODO Auto-generated method stub

}

}

// 当来电话的时候需要停掉播放业务

@Override

protected void onPause() {

if (mediaPlayer.isPlaying())

mediaPlayer.pause();

super.onPause();

}

@Override

protected void onResume() {

if (mediaPlayer.isPlaying())

mediaPlayer.pause();

super.onResume();

}

@Override

protected void onDestroy() {

if (mediaPlayer.isPlaying())

mediaPlayer.stop();

// 注意这个地方是释放

mediaPlayer.release();

super.onStop();

}

private class ButtonClickListener implements View.OnClickListener {

@Override

public void onClick(View v) {

try {

String filename = filenameText.getText().toString();

switch (v.getId()) {

case R.id.play:

// 得到文件名称 重点代码

String filenames = filenameText.getText().toString();

// 第一步对给对象进行重设

mediaPlayer.reset();

// 设置流的类型 关键代码

mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

// 设置数据来源

mediaPlayer.setDataSource("/sdcard/" + filenames);

// 设置需要播放的视频

// 把视频输出到显示控件上 重点代码

mediaPlayer.setDisplay(surfaceView.getHolder());

// 播放时前需要缓冲一下

mediaPlayer.prepare();

mediaPlayer.start();

break;

case R.id.pause:

if (mediaPlayer.isPlaying()) {

mediaPlayer.pause();

} else {

mediaPlayer.start();

}

break;

case R.id.reset:

if (!mediaPlayer.isPlaying()) {

mediaPlayer.start();

}

// 跳回到起始的地方重新播放

mediaPlayer.seekTo(0);

break;

case R.id.stop:

if (mediaPlayer.isPlaying()) {

mediaPlayer.stop();

}

break;

}

} catch (Exception e) {

Log.e(TAG, e.toString());

}

}

}

}