Android check contacts if they are registered in an app

Question

I need your help. I\'m developing an app which needs user to register account like Viber. What I want to include is to check if one of my contacts has already an account in

Answer 1

You can get all contacts from using code below and then send to your server:

ArrayList listAllContactName = new ArrayList();
ArrayList listAllContacts = new ArrayList();
ContentResolver cr = getContentResolver();
     Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
            null, null, null, null);

     if (cur.getCount() > 0) {
        while (cur.moveToNext()) {
            String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
            String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
            if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {

    //here you can get all contact names
    listAllContactName.add(name); 
    System.out.println("name : " + name + ", ID : " + id);

                // get the phone number
                Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,
                                       ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",
                                       new String[]{id}, null);
                while (pCur.moveToNext()) {
                      String phone = pCur.getString(
                             pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                      System.out.println("phone" + phone);
listAllContacts.add(phone);
                }
                pCur.close();