CustomMeetingActivity overriding onbackpressed is not working as my custom activity is not being used

Meeting SDK
1

I am using android sdk version 6.2.5.25195, i created custom activity extending it from NewMeetingActivity, added in manifest, and specified

<?xml version="1.0" encoding="utf-8"?> com.ZoomMeetingActivity

in config.xml

But my activity is not getting launched when i start meeting using meetingService.joinMeetingWithParams

Please help as i want to override back button function