Android get all contacts telephone number in ArrayList

Question

I am trying to save all contacts telephone numbers in an ArrayList but I cant find a way how. Is there a way to get them instead of picking them one by one with ContactsCont

Answer 1

This method is optimized as well as fetch only distinct contacts

@RequiresApi(api = Build.VERSION_CODES.N)
private List getContacts() {

    ArrayList list = new ArrayList<>();
    Cursor cursor = this.getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);

    cursor.moveToFirst();

    while (cursor.moveToNext()) {

        list.add(new ModelContacts(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME))
                , cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER))));

    }
    cursor.close();

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {

        List distinctList = list.stream().filter(distinctByKey(c -> c.getName()))
                .collect(Collectors.toList());
        
        return distinctList;
    }
    else {
       
        return list;
    }
}

@RequiresApi(api = Build.VERSION_CODES.N)
public static  Predicate distinctByKey (final Function keyExtractor)
{
    Map map = new ConcurrentHashMap<>();
    return t -> map.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
}