RealmConfig.java

public class MyApplication extends Application {
 
    @Override
    public void onCreate() {
 
        super.onCreate();
        RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this)
                .name(Realm.DEFAULT_REALM_NAME)
                .schemaVersion(0)
                .deleteRealmIfMigrationNeeded()
                .build();
        Realm.setDefaultConfiguration(realmConfiguration);
 
    }
}