Nose crear una cuenta regresiva de 24 horas

[Anke]

@EO4RU970

or how to make it keep counting even if I close the app

What's the point of a closed app for countdowns? I think you need an alarm manager, like the one @Taifun offers.

[PAID] Alarm Manager Extension with Notification or Autostart

Description Alarm Manager Extension to send a notification or autostart the app at a given time or at boot time only once or repeated by interval (15 minutes, half hour, hour, half day, day and week, month and year). After clicking the notification your app will be started. You can define a start text, which will be passed to your app in method 'get plain start text' and trigger some action after your app is started. You also can define several alarms, just use a different id for each alarm. A…