How to show app icon when new contact added

Question

I am creating an app in which I want to show my app icon in front of every contact if contact is associated with my app like in WhatsApp. I have searched a lot but didn't find any appropriate solution.

Answer 1

Fetch all the contacts from your phone like this.

 public void getNumber(ContentResolver cr)
        {
         mItems = new ArrayList<String>();
         Cursor phones = cr.query(Phone.CONTENT_URI, null, null, null, Phone.DISPLAY_NAME + " ASC");

            while (phones.moveToNext())
            {
              String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
              String phoneNumberString = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
              phoneNumberString.replace(" ", "");
             contactName.add(name);
              contactNumber.add(phoneNumberString);
              mItems.add(name);
            }
            phones.close();
        }

now send all these contacts to your server, compare each mobile number in your server database, and list only the contacts that are found in your server.

You need to maintain your own database, when registering user, save his number and while comparing, compare the fetched number to the register member's number in your own database