Question

我希望向用户集合中的所有用户添加一个整数数组字段。

我发现要执行此操作，最好使用List而不是数组。（Writing array in Firebase android）。

将这个integar数组添加到我已经在运行的User Registration活动中后，它可以完美地上传到数据库。但是随后登录时出现问题。产生以下错误：

java.lang.RuntimeException：无法反序列化对象。类java.util.List具有泛型类型参数，请改用GenericTypeIndicator（在“站点”中找到）

登录活动中代码的这一部分：

 userRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
                    @Override
                    public void onComplete(@NonNull Task<DocumentSnapshot> task) {
                        if(task.isSuccessful()){
                            Log.d(TAG, "onComplete: successfully set the user client." + task.getResult());
                            User user = task.getResult().toObject(User.class);
                            ((UserClient)(getApplicationContext())).setUser(user);
                        }
                    }
                });

具体在这一点上：

    User user = task.getResult().toObject(User.class);

这是我的User.java：

 public class User implements Parcelable{

private String email;
private String user_id;
private String username;
private String avatar;
private List stops;
private ClassLoader classLoader;


public User(String email, String user_id, String username, String avatar, List stops, ClassLoader classLoader) {
    this.email = email;
    this.user_id = user_id;
    this.username = username;
    this.avatar = avatar;
    this.stops = stops;
    this.classLoader = classLoader;
}

public List getStops() {
    return stops;
}

public void setStops(List stops) {
    this.stops = stops;
}

public ClassLoader getClassLoader() {
    return classLoader;
}

public void setClassLoader(ClassLoader classLoader) {
    this.classLoader = classLoader;
}

public User() {

}

protected User(Parcel in) {
    email = in.readString();
    user_id = in.readString();
    username = in.readString();
    avatar = in.readString();
    in.readList(stops, classLoader);

}

public static final Creator<User> CREATOR = new Creator<User>() {
    @Override
    public User createFromParcel(Parcel in) {
        return new User(in);
    }

    @Override
    public User[] newArray(int size) {
        return new User[size];
    }
};

public String getAvatar() {
    return avatar;
}

public void setAvatar(String avatar) {
    this.avatar = avatar;
}

public static Creator<User> getCREATOR() {
    return CREATOR;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getUser_id() {
    return user_id;
}

public void setUser_id(String user_id) {
    this.user_id = user_id;
}

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}





@Override
public String toString() {
    return "User{" +
            "email='" + email + '\'' +
            ", user_id='" + user_id + '\'' +
            ", username='" + username + '\'' +
            ", avatar='" + avatar + '\'' +
            ", stops='" + stops + '\'' +
            '}';
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(email);
    dest.writeString(user_id);
    dest.writeString(username);
    dest.writeString(avatar);
    dest.writeList(stops);
}

数据库如下

收藏>用户

文档> erEq5iWy1Fd1Jaj3wl2AeMOlXp62

Fields>化身：null，电子邮件“ bob @ gmail.com，classLoader：null，停止：[0,0,0,0,0,0,0]”，user_id：“ erEq5iWy1Fd1Jaj3wl2AeMOlXp62”，用户名：“ bob” < / p>

Answer 1

您需要为列表提供一个通用类型。

List<Integer> stops;

您的模型类示例

    public class User implements Parcelable{

        private String email;
        private String user_id;
        private String username;
        private String avatar;
        private List<Integer> stops;
        private ClassLoader classLoader;


        public User(String email, String user_id, String username, String avatar, List<Integer> stops, ClassLoader classLoader) {
            this.email = email;
            this.user_id = user_id;
            this.username = username;
            this.avatar = avatar;
            this.stops = stops;
            this.classLoader = classLoader;
        }


    public List<Integer> getStops() {
        return stops;
    }

    public void setStops(List<Integer> stops) {
        this.stops = stops;
    }
}

将布尔数组作为字段添加到Firestore文档

1 个答案: