difference between timer and alarmmanager

Question

I am a bit confused about Timer and AlarmManager used in Android.

What are the main differences between them?

They are b

Answer 1

Timer starts a service it executes code very frequently even thought it wasn't actually doing anything.

Alarmmanager on the other hand will start a Service that runs in the background always, this is what you want to use to schedule your code to run when your app isn't open.