When Deleting A Contact On Android, Other Random Contacts Id's Being Changed

I am trying to sync user phone numbers to firestore. It seems to work but when i delete a contact from my phone, it seems like some other contacts id's are being replaced, causing

Solution 1:

From the documentations and articles it seems that android can sometimes change the contact id, this is very strange and un-expected but makes sense after my many weeks and attempts trying to solve this issue.

From what i can understand, the reasons are quite diverse so i can guess also in my case when one change or delete of contact can change other contact id's.

It seems that to overcome, i need to use the `LOOKUP_KEY, which i yet to understand how.

Some documentations includes:

Detecting changes in android contacts

Check if contact has been changes on...

LOOKUP_KEY

Hopes it helps since the android documentations are so hard to follow