Android Start Task Within Specific Time

I want my task to be started at 12, 3, 6, 9 pm on every day. To these hours, a method should be called. How can I implement such a scenario. If anyone can grant a resource or code

Solution 1:

Check out the AlarmManager http://developer.android.com/reference/android/app/AlarmManager.html

Search stack for examples, here is one Alarm Manager Example