背景

当时是Tv项目中涉及到视频的大小窗播放的这样一个功能 ，当时我想到的是就是给 VideoView 设置一个单独的布局 从而对此布局进行操作 上代码：

首先先你的onCreate方法里

        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.EXACTLY);
        int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        mainLl.measure(w, h);
//获取你原来布局的宽高
         int  measuredHeight = mainLl.getMeasuredHeight();
         int   measuredWidth = mainLl.getMeasuredWidth();

//这是你的布局距离上下左右的边距
//topMargin 上    leftMargin  左  rightMargin  右  bottomMargin  下
        ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams)     
        mainLl.getLayoutParams();
        int   topMargin = params.topMargin;
        int   leftMargin = params.leftMargin;
        int   rightMargin  = params.rightMargin;
        int   bottomMargin  = params.bottomMargin;

全屏的处理代码

//你要设置的 FrameLayout 我这里用的是帧布局 
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                        FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);
//mainLl你的布局id
                mainLl.setLayoutParams(params);

缩小的处理代码

FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(measuredWidth , measuredHeight );
layoutParams.setMargins(leftMargin, topMargin, rightMargin , bottomMargin);
mainLl.setLayoutParams(layoutParams);