Android 用视频做页面背景

不知道怎么开头，直接代码。

xml：RelativeLayout布局，MyVideoView放在第一位，其他的放到之下就可以。

<MyVideoView
    android:id="@+id/videoView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:foregroundGravity="center"
    android:layout_alignParentBottom="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"/>
MyVideoView：

public class MyVideoView extends VideoView {
    public MyVideoView(Context context) {
        super(context);
    }

    public MyVideoView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyVideoView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //重新计算高度
        int width = getDefaultSize(, widthMeasureSpec);
        int height = getDefaultSize(, heightMeasureSpec);
        setMeasuredDimension(width, height);
    }

    @Override
    public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {
        super.setOnPreparedListener(l);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return super.onKeyDown(keyCode, event);
    }

}

Activity：

 private void setVideo() {
        //设置播放加载路径
        videoView.setVideoURI(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.login));
        //播放
        videoView.start();
        //循环播放
        videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {
                videoView.start();
            }
        });
        //设置为静音
        videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mediaPlayer) {
                mediaPlayer.setVolume(0f, 0f);
            }
        });
    }

    //返回重启加载
    @Override
    protected void onRestart() {
        setVideo();
        super.onRestart();
    }

    //防止锁屏或者切出的时候，音乐在播放
    @Override
    protected void onStop() {
        videoView.stopPlayback();
        super.onStop();
    }