How to read contacts in Android using Realm?

Question

I can\'t find any solutions to read contacts from Android and save them in Realm. Anyone done that before?

I know that I will have to use Contacts Provider

Answer 1

Create RealmObject, read the data from content provider, save data to RealmObject, save data in Realm:

// background thread
Realm realm = null;
try {
    realm = Realm.getDefaultInstance();
    realm.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            RealmContact realmContact = new RealmContact();
            Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
            while (phones.moveToNext()) {
               String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
               String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
               realmContact.setName(name);
               realmContact.setPhoneNumber(phoneNumber);
               realm.insertOrUpdate(realmContact);
            }
        }
    });
} finally {
    if(realm != null) {
        realm.close();
    }
}

EDIT: okay, here's a trick to merging data and removing all data that's not in the list you've saving

public class RealmContract extends RealmObject {
    @PrimaryKey
    private long id;

    @Index
    private String name;

    @Index
    private String phoneNumber;

    @Index
    private boolean isBeingSaved;

    //getters, setters
}

Then merge:

// background thread
Realm realm = null;
try {
    realm = Realm.getDefaultInstance();
    realm.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            RealmContact realmContact = new RealmContact();
            Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
            while (phones.moveToNext()) {
               String id = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds._ID));
               String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
               String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
               realmContact.setId(id);
               realmContact.setName(name);
               realmContact.setPhoneNumber(phoneNumber);
               realmContact.setIsBeingSaved(true);
               realm.insertOrUpdate(realmContact);
            }
            realm.where(RealmContact.class)
                 .equalTo(RealmContactFields.IS_BEING_SAVED, false) // compile 'dk.ilios:realmfieldnameshelper:1.0.0'
                 .findAll()
                 .deleteAllFromRealm(); // delete all non-saved data
            for(RealmContact realmContact : realm.where(RealmContact.class).findAll()) { // realm 0.89.0+
                realmContact.setIsBeingSaved(false); // reset all save state
            }
        }
    });
} finally {
    if(realm != null) {
        realm.close();
    }
}

---

EDIT: Refer to OP's other question for reading contact data reliably (because there's something up with the Contact LOOKUP_ID and making sure the IDs are correct): Obtaining contacts from content provider without duplicates or invalid contacts, and save to Realm

Answer 2

You can create a Model Class to store desired data from contact

then using Cursor get data and set data in model class.

Save the cursor data in list of model object.

Then insert all model object in single transaction as per object transaction has overhead and slow our app