WindowManager.LayoutParams.MATCH_PARENT报红

不知道什么原因，WindowManager.LayoutParams.MATCH_PARENT为什么报红呀

WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(WindowManager.LayoutParams.MATCH_PARENT,WindowManager.LayoutParams.MATCH_PARENT);
 wm.addView(new View(mContext), params);

你的导包是否都正确？依赖添加啥的是否都在正确位置？检查看看