android,在设置亮度的时候，为什么没有立即生效？

android,在设置亮度的时候，为什么没有立即生效？要关闭屏幕或自动变暗后，才生效。改变自动调节或手动调节模式时，倒是一小会儿后生效了。请问，如何解决？
publicvoid setBrightness(int brightness)
{
// if (sysAutomaticMode)// return;

Settings.System.putInt(context.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS, brightness);
}
android原码使用了：
IPowerManager power = IPowerManager.Stub.asInterface(
ServiceManager.getService("power"));
if (power != null) {
power.setBacklightBrightness(brightness);
}
但是自己写的用不了IPowerManager啊。

还有，调节亮度是在服务里操作的。

你的代码不够完整。应该设置如下：
public void setBrightness(float fl) {

WindowManager.LayoutParams lp = this.getWindow().getAttributes();
int brightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS,0);
// lp.screenBrightness = brightness/255.0f;
lp.screenBrightness = fl;
this.getWindow().setAttributes(lp);
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightness);
}

private int getscreenmode(){ int screenmode=0; try{ screenmode = settings.system.getint(getcontentresolver(), settings.system.screen_brightness_mode); } catch (exception localexception){ } return screenmode; } private int getscreenbrightness(){ int screenbrightness=255; try{ screenbrightness = settings.system.getint(getcontentresolver(), settings.system.screen_brightness); } catch (exception localexception){ } return screenbrightness; } private void setscreenmode(int paramint){ try{ settings.system.putint(getcontentresolver(), settings.system.screen_brightness_mode, paramint); }catch (exception localexception){ localexception.printstacktrace(); } } private void savescreenbrightness(int paramint){ try{ settings.system.putint(getcontentresolver(), settings.system.screen_brightness, paramint); } catch (exception localexception){ localexception.printstacktrace(); } } private void setscreenbrightness(int paramint){ window localwindow = getwindow(); windowmanager.layoutparams locallayoutparams = localwindow.getattributes(); float f = paramint / 255.0f; locallayoutparams.screenbrightness = f; localwindow.setattributes(locallayoutparams); }

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