有没有办法让后台应用程序在其他应用程序运行时显示某些内容？

Question

for example, if i'm playing a game, a trigger will display an alert after a certain time to warn me not playing too much time and should have a rest. Both android and iphone solution is welcome.

Answer 1

On Android, using the following permission,

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

you can draw views on top of any other application. For example, this is the permission used by the Facebook Home app to draw its chat heads .

Also, this is a system permission, so it does come at a cost.

Answer 2

Think about it as on an Alarm Clock, which can interrupt your current App, something which is off-course possible.

Regarding Android you might want to read about AlarmManager

As for iPhone you might want to take a look in this Stackoverflow question discussing local notifications.

Answer 3

(Android solution)

You could use AlarmManager with setRepeating function to repeat this task

Check here

Hope it helps :)