Android架构组件:如何插入仓库参数

@Database(entities = {User.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
    private static AppDatabase instance;

    public static synchronized AppDatabase getInstance(Context context) {
        if (instance == null) {
            instance = Room.databaseBuilder(context.getApplicationContext(),
                    AppDatabase.class, "my-database")
                    .fallbackToDestructiveMigration()
                    .build();
        }
        return instance;
    }

    public abstract UserDao userDao();
}