what theme should I use to hide the notification bar but show the action bar? (Like calculator on Samsung phones)
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
Use this with Theme holo **you have to do it through coding add this before setContentView() **
来源：https://stackoverflow.com/questions/27313117/android-fullscreen-activity-with-action-bar