Android: Calendar Event Callback

Question

I need to trigger if a Calendar event scheduled for current time.The same way calendar app notify us for event. How can I add listener for this

Answer 1

That is the job for the AlarmManager or the JobScheduler. There you can define when you want to be invoked to trigger your notification. If you want to use a more convenience library try android-job from evernote they handle the differences of the different platforms, since there where some chances over the time.

Basically for all of those three implementations you plan when your reciever should be invoked and then you show your notification. Keep in mind that the AlarmManager won't manage your pending notifications after a reboot, while the JobScheduler has this option, but requires api level 21.

It seems that you are more interested to read the events out of the calendar of your device. You can read out the calendar with the Calendar Provider. The documentation should be fine enough to find out the details yourself.