设置屏幕亮度的悲剧

	      WindowManager.LayoutParams localLayoutParams = getWindow().getAttributes();
	      System.out.println(localLayoutParams.screenBrightness);
	        localLayoutParams.screenBrightness = new Random(System.currentTimeMillis()).nextInt(10)*1F/10F;
	        getWindow().setAttributes(localLayoutParams);

说的都没错，但是如果嵌套在tabtab里卖弄的话，请getParent().......