android change brightness setting from BroadcastReceiver -


i have app installed on system partition (android 4.4.1 , 4.1.2). need set brightness of screen according battery level. so, register on application class broadcastreceiver listens intent.action_battery_changed intent check battery status.

i've seen many answers how on activity , on service using fake activity. use service - activity approach don't want start activity apply brightness setting windowmanager.

this have:

    contentresolver contentresolver = context.getcontentresolver();     int currentbrightness = settings.system.getint(context.getcontentresolver(), settings.system.screen_brightness, -1);     int newbrightness = -1;      // set brightness according battery level     if (batterypercentage > batteryutils.battery_safe_level             && currentbrightness != brightness_high) {         newbrightness = brightness_high;     } else if (batterypercentage <= batteryutils.battery_safe_level             && batterypercentage > batteryutils.battery_low_level             && currentbrightness != brightness_normal) {         newbrightness = brightness_normal;     } else if (batterypercentage <= batteryutils.battery_low_level             && currentbrightness != brightness_low) {         newbrightness = brightness_low;     }      if (newbrightness != -1) {         settings.system.putint(contentresolver, settings.system.screen_brightness_mode, settings.system.screen_brightness_mode_manual);         settings.system.putint(contentresolver, settings.system.screen_brightness, newbrightness);         log.v(context.getstring(r.string.app_name), "batteryreceiver: setting brightness " + newbrightness + "("+ batterypercentage+ "%, " + plugged +")");     }

as might imagine, brightness setting changed correctly -if reboot device new brightness setting applied next time device reboot- it's not applied immediatly.

is there way of applying setting immediatly without having start activity? maybe api system app can use?


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