synchronization - Put your app account in Auto-Sync settings android

Question

I am new on this so i do not find the answer on the internet or i am not sure if the answer is that. What i am trying to do is to make my app sync all the contacts in the native contact app like whatsapp or facebook does. I also wanted to link contacts. Any hint or tutorial would be great.

Something like this:

What are the benefits of putting my app over there? I am very new on this. Please I hope an answer do not vote down D:. Any answer is welcome.

Answer 1

Account Manager requires several key api's to work with your app.

Just to show your App account

• Authenticator Activtiy which extends AbstractAccountAuthenticator
• Service Activity which Bind's with Authenticator
• An xml file in RES/XML folder
• Some Settings in Android Manifest.

Read this https://www.finalconcept.com.au/article/view/android-account-manager-step-by-step

To Auto Sync your Account;

• SyncAdapter Class which extends AbstractThreadedSyncAdapter
• SyncService which extends Service
• an xml file , which defines metadata for SyncAdapter
• Permission in Android Manifest
• Optionally Content Provider Class

Offical Android Developer Tutorial https://developer.android.com/training/sync-adapters/index.html

Another Fully Detailed answer (With Examples) : Android Login - Account Authenticator vs Manual Authentication