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I'm new to Android and connected few dots for my problem but stuck with one point.

Goal: Like WhatsApp icon displayed in contact that are registered user of WhatsApp. I want to do the same for my app's registered user.

What I did so far: I created sync adapter to run contact sync in background.

Now I want to do something like this. 

cursor start [read android contact]
    // api calls
    if(user-registered-with-app){
        // attach my app's userId with android contact and save the contact
    }
cursor end

Is it the correct way to link my app's user to android contacts?

I've read following questions but I didn't understand it properly.

Link Android application with contacts/phonebook programatically

Android check contacts if they are registered in an app

Vicky Thakor
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  • https://stackoverflow.com/a/27816205/10182897 this one helps you to access contacts to your application and https://stackoverflow.com/a/29070320/10182897 this one i think it sends the contact list to server database and confirm which users are register – Ashish Jan 04 '19 at 17:36
  • check these two tutorials: http://blog.udinic.com/2013/04/24/write-your-own-android-authenticator/ http://blog.udinic.com/2013/07/24/write-your-own-android-sync-adapter – marmor Jan 06 '19 at 08:48

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