屏幕适配的关键点

//所有代码的目的就是获取屏幕的高宽
//然后设置图片的高宽
DisplayMetrics dm = new DisplayMetrics();

((Activity)mContext).getWindowManager().getDefaultDisplay().getMetrics(dm);

 int screenWidth = dm.widthPixels;

 int screenHeight = dm.heightPixels;

 ViewGroup.LayoutParams params = hodler.bigImage.getLayoutParams();

params.height=screenWidth/2;

params.width =screenHeight/2;

hodler.bigImage.setLayoutParams(params);