Android用SurfaceView播放本地视屏（音频)文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1"
    android:orientation="vertical" >
    <SurfaceView
        android:id="@+id/surfaceVIew"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="0.15"
        tools:context=".MainActivity" />
    <LinearLayout 
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="0.85">
        <Button 
            android:id="@+id/btn_play"
            android:text="开始"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <Button 
           android:id="@+id/btn_pause"
            android:text="暂停"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <Button 
          android:id="@+id/btn_stop"
            android:text="停止"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <Button 
           android:id="@+id/btn_low"
            android:text="调低音量"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <Button 
           android:id="@+id/btn_hight"
            android:text="调高音量"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </LinearLayout>
</LinearLayout>

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mp3mp4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;
}
}
}