room callback

Room.databaseBuilder(context, AppDatabase.class,
                DB_NAME)
                .allowMainThreadQueries()
                .fallbackToDestructiveMigration()
                .addCallback(new RoomDatabase.Callback() {
                    @Override
                    public void onCreate(@NonNull SupportSQLiteDatabase db) {
                        super.onCreate(db);
                        Executors.newSingleThreadExecutor().execute(() -> {
                            //заполнение базы
                        });
                    }

                    @Override
                    public void onOpen(@NonNull SupportSQLiteDatabase db) {
                        super.onOpen(db);
                    }
                })
                .build();