Android Alarm notification on particular date and time and app should be active

Question

I need to know step by step process to do notification

requirement: user will register for an event and then they will notification before one day at 9 am and before half an hour.

• even if app is not active they should get notification.

Answer 1

This is a really simple task you can either use Alarm-manager to set to go off on that day which will fire a notification to your app. https://www.sitepoint.com/scheduling-background-tasks-android/

A better approach would be to use a job scheduler http://www.vogella.com/tutorials/AndroidTaskScheduling/article.html