如何将 Java 框架与其他技术叠加以增强移动应用程序？

implementation 'com.google.android.gms:play-services-auth:19.2.+@aar'

implementation 'androidx.room:room-runtime:2.4.3'

@Entity
public class User {
    @PrimaryKey
    public int id;
    public String name;
    public String email;
}

@Dao
public interface UserDao {
    @Query("SELECT * FROM User")
    List<User> getAll();

    @Insert
    void insertUser(User user);
}

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

Firebase.auth.signInWithCustomToken(token)
        .addOnCompleteListener(this)
        .addOnSuccessListener(new OnSuccessListener<AuthResult>() {
            @Override
            public void onSuccess(AuthResult authResult) {
                // Firebase Auth 成功
            }
        });

User user = new User();
        user.name = "John Doe";
        user.email = "john.doe@example.com";
        firebaseAuth.createUserWithEmailAndPassword(user.email, password)
                .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            // 保存用户到数据库
                            appDatabase.userDao().insertUser(user);
                        } else {
                            // 处理注册失败
                        }
                    }
                });