方式1:
在自定义控件中使用,context需要强转为activity才能获取到WindowManager对象
screenWidth = ((Activity) context).getWindowManager().getDefaultDisplay().getWidth();
screenHeight = ((Activity) context).getWindowManager().getDefaultDisplay().getHeight();
方式2:
DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
screenWidth = displayMetrics.widthPixels;
screenHeight = displayMetrics.heightPixels;