android - fetch distinct and unique contacts from the phone avoiding duplicity -


i want retrieve contact list phone avoiding duplicates. think retrieving contacts google account,phone or sim. how avoid duplicate contacts. though contact can have same number different numbers. same name , same number should not appear in list. code.

contentresolver cr = getcontentresolver();         final string[] projection = new string[] {                 contactscontract.commondatakinds.phone.contact_id,                 contactscontract.contacts.display_name,                 contactscontract.commondatakinds.phone.number         };         string selection = contactscontract.contacts.in_visible_group + " = '"                 + ("1") + "'";         //string selection = contactscontract.contacts.has_phone_number;         cursor cur = cr.query(contactscontract.commondatakinds.phone.content_uri, projection, selection                 + " , " + contactscontract.contacts.has_phone_number                 + "=1", null,  contactscontract.commondatakinds.phone.display_name + " collate localized asc");          if(cur != null) {             if (cur.getcount() > 0) {                 while (cur.movetonext()) {                      string contactphone = cur.getstring(cur.getcolumnindex(contactscontract.commondatakinds.phone.number));                     string contactname = cur.getstring(cur.getcolumnindex(contactscontract.commondatakinds.phone.display_name));                     string contactid = cur.getstring(cur.getcolumnindex(contactscontract.commondatakinds.phone.contact_id));                     contacts.add(new contact().setid(contactid).setname(contactname).setnumber(contactphone));                 }             }              cur.close();         }

i not sure whether reliable or not, worked me

first copy contacts in arraymap phone numbers key , contact name value. in method, if phone numbers repeated, update name.

once arraymap createt, can use iterator retrieve contact unique phone number.

arraymap<string, string> arraymap = new arraymap<>(); // //  while (cursor.movetonext()){                 string phone = cursor.getstring(cursor.getcolumnindex(contactscontract.commondatakinds.phone.number));                 string name = cursor.getstring(cursor.getcolumnindex(contactscontract.commondatakinds.phone.display_name));                 arraymap.put(phone, name);             } // // for(string key: arraymap.keyset()){             jsonobject jsonobject = new jsonobject();             try {                 jsonobject.put("name", arraymap.get(key));                 jsonobject.put("phone_number", key);                 contactslist.put(jsonobject);             }catch(jsonexception e){                 e.printstacktrace();             }         }

in case can directly call new contacts(...) instead of using jsonobject.


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