创建模型类并在子节点中获取数据 [英] Create model class and get the data inside the child node

问题描述

我正在创建一个模型类以将其用于firebaserecycleradapter，但是我的问题是用户数据中有一个子节点.看起来像这样

I am creating a model class to use it to firebaserecycleradapter but my problem is there is a child node inside a user data. It looks like this

我需要获得以下信息:(名称，缩略图，年份，课程).这是我所做的

I need get the following: (name, thumbnail, year, course). This what I have done

public class Users {

private String name;
private String thumbnail;

//TODO: need to get the year and course, inside the Student


public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getThumbnail() {
    return thumbnail;
}

public void setThumbnail(String thumbnail) {
    this.thumbnail = thumbnail;
}
}

我如何获得学生的学年和课程

How can I get the year and course inside the student

推荐答案

要在用户数据中获取子节点数据，即Student(年，课程)中的值，您需要制作如下模型类:

To get the child node data inside a user data That is values inside Student (year, course) you need to make model class like below:

 public class User {


    private String name;
    private String thumbnail;
    private Student student;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getThumbnail() {
        return thumbnail;
    }

    public void setThumbnail(String thumbnail) {
        this.thumbnail = thumbnail;
    }

    public Student getStudent() {
        return student;
    }

    public void setStudent(Student student) {
        this.student = student;
    }


    public class Student {

        private String year;
        private String course;

        public String getYear() {
            return year;
        }

        public void setYear(String year) {
            this.year = year;
        }

        public String getCourse() {
            return course;
        }

        public void setCourse(String course) {
            this.course = course;
        }

    }
}

您可以使用构造函数以及getter/setter方法.

You can use constructor as well as getter/setter method for the same.

要向模型中添加数据，请创建对象并使用如下所示的set方法:

For adding data to model, create object and use set method like below:

//Setting Data
User userObj = new User();
userObj.setName("XYZ");
userObj.setThumbnail("URL");

Student student = new User().new Student();
student.setYear("2018");
student.setCourse("MCA");

userObj.setStudent(student);

您只需要使用get方法将数据分配给模型类的对象并获取数据，就像这样...

You simply need to assign data to object of model class and the fetch data by using get methods, like this...

//Getting Data                           
String name=userObj.getName();
String thumbnail=userObj.getThumbnail();
String year=userObj.getStudent().getYear();
String course=userObj.getStudent().getCourse();

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