How Google calendar or Instagram make their apps all the time up and running even after force stop

Question

Looks like force stop should prevent app from running and it\'s even disable all app\'s alarms. However I found that notification in Google Calendar still shown fine even after

Answer 1

Just to add with Sagar Damani's answer, A service call is required to run your long operation in background but they also run in sepearate processes. When you declare a service or an activity in the androidMenifes.xml, also add the android:process="" attribute. Therefore, it will always be persistent if the user kills/force stop the activity.