How build an application Alarm in Android

Question

I have been searching the internet for an hour trying to find out how to create a reminder or an alarm in my android application. Does anybody know any tutorials for creating a reminder in your android app?

Its correct use notifications for sent all the alamrs?

affects battery consumption?

Answer 1

if you want to have an example app, you can get it here.

And this is how you can download from github.