videoview全屏播放



VideoView与视频比例缩放：

以前在论坛上也看到有人问过如何实现视频按比例缩放的问题。的确，如果仅仅使用VideoView可能达不到我们想要达到的效果。这就需要我们对VideoView做一些改动，简单的说就是另外写一个类似VideoView的类出来（庆幸Android是开源的）。我们可以很方便的获得VideoView的源代码，最简单的方法是直接在GoogleCodeSearch上找“VideoView.java”。所以重写VideoView的过程其实只是在原来的基础上进行一些修改而已，并非一个很麻烦的工作。为什么Android自带的VideoView会保持视频的长宽比而不能让我们很方便的自定义比例呢？我猜想可能Google做Android也是一个很仓促的工程，许多代码并没有考虑得太成熟。VideoView的源码中有这样一段代码：

1 @Override
2 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
3 //Log.i(“@@@@“, “onMeasure”);
4 int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
5 int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
6 if (mVideoWidth > 0 && mVideoHeight > 0) {
7 if ( mVideoWidth * height > width * mVideoHeight ) {
8 //Log.i(“@@@“, “image too tall, correcting”);
9 height = width * mVideoHeight / mVideoWidth;
10 } else if ( mVideoWidth * height < width * mVideoHeight ) {
11 //Log.i(“@@@“, “image too wide, correcting”);
12 width = height * mVideoWidth / mVideoHeight;
13 } else {
14 //Log.i(“@@@“, “aspect ratio is correct: " +
15 //width+“/“+height+“=“+
16 //mVideoWidth+“/“+mVideoHeight);
17 }
18 }
19 //Log.i(“@@@@@@@@@@“, “setting size: " + width + 'x' + height);
20 setMeasuredDimension(width, height);
21 }
22

这就是为什么长宽比不能改变的原因了。因为在OnMeasure的时候，就对这个长宽比进行了处理。我们把其中处理的代码屏蔽掉，视频大小就可以随着VideoView的长宽改变而改变了。

1 @Override
2 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
3 //Log.i(“@@@@“, “onMeasure”);
4 int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
5 int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
6 /*//if (mVideoWidth > 0 && mVideoHeight > 0) {
7 if ( mVideoWidth * height > width * mVideoHeight ) {
8 //Log.i(“@@@“, “image too tall, correcting”);
9 height = width * mVideoHeight / mVideoWidth;
10 } else if ( mVideoWidth * height < width * mVideoHeight ) {
11 //Log.i(“@@@“, “image too wide, correcting”);
12 width = height * mVideoWidth / mVideoHeight;
13 } else {
14 //Log.i(“@@@“, “aspect ratio is correct: " +
15 //width+“/“+height+“=“+
16 //mVideoWidth+“/“+mVideoHeight);
17 }
18 }*/
19 //Log.i(“@@@@@@@@@@“, “setting size: " + width + 'x' + height);
20 setMeasuredDimension(width,height);
21 }

自定义VideoView
public class CustomVideoView extends VideoView {

    private int mVideoWidth;    private int mVideoHeight;    public CustomVideoView(Context context) {            super(context);            // TODO Auto-generated constructor stub    }    public CustomVideoView(Context context, AttributeSet attrs) {            super(context, attrs);            // TODO Auto-generated constructor stub    }    public CustomVideoView(Context context, AttributeSet attrs, int defStyle) {            super(context, attrs, defStyle);            // TODO Auto-generated constructor stub    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {            // TODO Auto-generated method stub            // Log.i("@@@@", "onMeasure");           //下面的代码是让视频的播放的长宽是根据你设置的参数来决定            int width = getDefaultSize(mVideoWidth, widthMeasureSpec);            int height = getDefaultSize(mVideoHeight, heightMeasureSpec);            setMeasuredDimension(width, height);    }

}

MediaController controller = new MediaController(this);

    mVideoView = (CustomVideoView)findViewById(R.id.videoView1);    mVideoView.setMediaController(controller);    mVideoView.setVideoPath(mVideoPath);