Upgrade Realm in an Android Project

How to update initial data in realm after update of apk?

You have to implement RealmMigration and pass it to RealmConfiguration.Builder().migration().
Something like this:

public class RealmMigrationAgent implements RealmMigration
{
    @Override
    public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
        RealmSchema schema = realm.getSchema();

        if (oldVersion == 0) {
            schema.get("InventDisableObject").addField("Reason", int.class);
            oldVersion++;
        }

        if (oldVersion == 1) {
            if (!schema.get("ActionObject").hasField("Annual"))
                schema.get("ActionObject").addField("Annual", boolean.class);
            oldVersion++;
        }
        if (oldVersion == 2) {
            if (!schema.get("ActionObject").hasField("Hash"))
                schema.get("ActionObject").addField("Hash", String.class);
            if (!schema.get("ActionObject").hasField("Manual"))
                schema.get("ActionObject").addField("Manual", boolean.class);
            oldVersion++;
        }
        if (oldVersion == 3) {
            if (!schema.get("OutletObject").hasField("Code"))
                schema.get("OutletObject").addField("Code", String.class);
            oldVersion++;
        }
    }
}

Incrementally adding scheme updates for every new scheme version.
I can see you have some class Migration for migration reason - can you provide the code of it?

Detect change in realm database and update remote database android

As mentioned in Realm Documentation

-Add change listener.

-Add data

-The change is instantly reflected in onChangeListener.

private RealmResults<Dog> puppies;

// ...

puppies = realm.where(Dog.class).lessThan("age", 2).findAll();
puppies.size(); // => 0

realm.executeTransaction(new Realm.Transaction() {
    @Override
    void public execute(Realm realm) {
        Dog dog = realm.createObject(Dog.class);
        dog.setName("Fido");
        dog.setAge(1);
    }
});

puppies.addChangeListener(new RealmChangeListener() {
    @Override
    public void onChange(RealmResults<Dog> results) {
      // results and puppies point are both up to date
      results.size(); // => 1
      puppies.size(); // => 1
    }
});

UPDATE

 localRealm.addChangeListener(new RealmChangeListener<Realm>() {
        @Override
        public void onChange(Realm realm) {
            //do stuff
        }
    });

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