how to add register user contacts in android app same as whatsapp? -


i want add contact list of registered user in android app. eg. many user registered whatsapp? when install save contacts shown in whats contact list.how happened.i new in android development please give me solution.

  1. get contacts device
  2. send server
  3. compare list of registered users (from db)
  4. return registered list of users device
  5. list wish in app

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