相信做android开发有一段时间的朋友们做多媒体项目用的是VideoView来播放多媒体，而且操作简单、方便。除此之外，我们还可以利用MediaPlayer用来播放视频，不过MediaPlayer主要用于 播放音频，没有提供输出图像的输出界面，就是只能听到声音，看不到画面，这时就想到到了SurfaceView控件，将它与MediaPlayer结合起 来，就能达到了视屏播放效果了，今天就做一个简单的视屏播放功能，把准备好的视屏文件test.3gp放在手机SD卡中，然后用SurfaceView来播放： 布局activity_main.xml:

接着就是Activity:

public class MainActivity extends Activity implements OnClickListener {
 
         /** 功能按钮 **/
private Button btn_play, btn_pause, btn_stop, btn_low, btn_height;
 
       /** SurfaceView **/
private SurfaceView mSurfaceView;
/** 播放视频对象 **/
private MediaPlayer mediaPlayer;
/** 系统声音 **/
private AudioManager audioManager;
/** 记录播放位置 **/
private int position;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
 
               /**设置窗口无title**/
requestWindowFeature(Window.FEATURE_NO_TITLE);
                 /**全屏显示**/
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
findViews();
setListeners();
mediaPlayer = new MediaPlayer();
setSurfaceView();
}
 
 
// 横竖屏切换时的处理
@Override
protected void onSaveInstanceState(Bundle outState) {
if (mediaPlayer != null && mediaPlayer.isPlaying()) {// 如果在播放的时候切换屏幕则保存当前观看的位置
outState.putInt("position", mediaPlayer.getCurrentPosition());
}
super.onSaveInstanceState(outState);
}
 
 
// 横竖屏切换后的处理
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
if (savedInstanceState.containsKey("position")) {
position = savedInstanceState.getInt("position");// 取得切换屏幕时保存的位置
}
super.onRestoreInstanceState(savedInstanceState);
}
 
 
/** 实例化UI **/
private void findViews() {
btn_play = (Button) findViewById(R.id.btn_play);
btn_pause = (Button) findViewById(R.id.btn_pause);
btn_stop = (Button) findViewById(R.id.btn_stop);
btn_low = (Button) findViewById(R.id.btn_low);
btn_height = (Button) findViewById(R.id.btn_hight);
mSurfaceView = (SurfaceView) findViewById(R.id.surfaceVIew);
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
}
 
 
/** 为5个按钮设置监听 **/
private void setListeners() {
btn_play.setOnClickListener(this);
btn_pause.setOnClickListener(this);
btn_stop.setOnClickListener(this);
btn_low.setOnClickListener(this);
btn_height.setOnClickListener(this);
}
 
 
/** 播放视频 **/
private void playMedia() {
/** 初始化状态 **/
mediaPlayer.reset();
/** 设置声音流类型 **/
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
/** 设置mp3\mp4加载路径 **/
File file = new File(Environment.getExternalStorageDirectory(), "test.3gp");
try {
mediaPlayer.setDataSource(file.getAbsolutePath());
// 缓冲
mediaPlayer.prepare();
// 开始播放
mediaPlayer.start();
// 具体位置
Log.i("position", position + "------");
mediaPlayer.seekTo(position);
// 视频输出到View
mediaPlayer.setDisplay(mSurfaceView.getHolder());
// 重置位置为0
position = 0;
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/** 设置surfaceView视图 **/
private void setSurfaceView() {
// creates a "push" surface
mSurfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
// 设置事件，回调函数
mSurfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
/** SurfaceView创建时 **/
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (position > 0) {
playMedia();
position = 0;
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub
}
/** SurfaceView销毁视图 **/
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
/** Activity销毁时停止播放，释放资源。不做这个操作，即使退出，还是能听到视频的声音 **/
mediaPlayer.release();
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_play:// 播放
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
return;
} else {
playMedia();
}
break;
case R.id.btn_pause:// 暂停
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
position = mediaPlayer.getCurrentPosition();
mediaPlayer.pause();
} else {
return;
}
break;
case R.id.btn_stop:// 停止
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
mediaPlayer.stop();
position = 0;
} else {
return;
}
break;
case R.id.btn_low:// 调小音量
// 获取当前的音乐音量
int volume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
Log.v("Volume", "volume" + volume);
// 音量>0
if (volume > 0) {
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, 0);
} else {
return;
}
break;
case R.id.btn_hight:// 调大音量
volume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
// 音量<100
if (volume < audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)) {
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, 0);
} else {
return;
}
break;
}
}
}

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