Android失去状态栏和标题栏的高度

// 得到屏幕的宽			displayMetrics = getResources().getDisplayMetrics();			screenWidth = displayMetrics.widthPixels;			// 得到标题栏和状态栏的高度			Rect rect = new Rect();			Window window = getWindow();			mImageView.getWindowVisibleDisplayFrame(rect);			int statusBarHeight = rect.top;			int contentViewTop = window.findViewById(Window.ID_ANDROID_CONTENT).getTop();			int titleBarHeight = contentViewTop - statusBarHeight;			// 得到屏幕的高			screenHeight = displayMetrics.heightPixels- (statusBarHeight + titleBarHeight);