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Android - Firebase - Getting Child of Child Data

如何查看子节点和孙子节点

E / data：{6640 = {first = {sub3 = dbms，m5 = 3，m2 = 2，sub2 = dl，sub1 = cis，m3 = 2，sub4 = socio，m4 = 2，sub5 = english， M1 = 4}}}

firebase data structure

我想要的值是

6640内的孩子，例如：第一和第二
孙子里面的第一个例如：sub1 - sub5和m1-m5

上面的数据是来自查询的快照数据快照..我如何从以下快照访问每个值..我创建了一个数据模块，并为每个循环使用了这样的

 for (DataSnapshot post : dataSnapshot.getChildren())
     {
      trial_module m2 = post.getValue(trial_module.class);
      Log.e("data",dataSnapshot.getValue().toString());
      data2.add(m2);
      }

我是否需要创建多个类来保存数据？

public class Result_module {
    String sub1,sub2,sub3,sub4,sub5;
    long m1,m2,m3,m4,m5;


    public String getSub1() {
        return sub1;
    }

    public void setSub1(String sub1) {
        this.sub1 = sub1;
    }

    public String getSub2() {
        return sub2;
    }

    public void setSub2(String sub2) {
        this.sub2 = sub2;
    }

    public String getSub3() {
        return sub3;
    }

    public void setSub3(String sub3) {
        this.sub3 = sub3;
    }

    public String getSub4() {
        return sub4;
    }

    public void setSub4(String sub4) {
        this.sub4 = sub4;
    }

    public String getSub5() {
        return sub5;
    }

    public void setSub5(String sub5) {
        this.sub5 = sub5;
    }

    public long getM1() {
        return m1;
    }

    public void setM1(long m1) {
        this.m1 = m1;
    }

    public long getM2() {
        return m2;
    }

    public void setM2(long m2) {
        this.m2 = m2;
    }

    public long getM3() {
        return m3;
    }

    public void setM3(long m3) {
        this.m3 = m3;
    }

    public long getM4() {
        return m4;
    }

    public void setM4(long m4) {
        this.m4 = m4;
    }

    public long getM5() {
        return m5;
    }

    public void setM5(long m5) {
        this.m5 = m5;
    }
}

firebase访问子节点和孙子节点android

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