android - 值没有被插入到 Firebase 数据库中

Question

我在 Firebase 中创建了一个帐户，并创建了一个名为“Fieldglass”的项目。

现在单击 firebase 帐户中的数据库选项卡，我得到一个名为的数据库:fieldglass-aeca7

现在我想在其中插入值。我已经在 OnCreate() 函数中为它编写了代码。

final CountDownLatch sync = new CountDownLatch(1);

        DatabaseReference db= FirebaseDatabase.getInstance().getReference("fieldglass-aeca7");
        String userId=db.push().getKey();
        User u=new User("shikher","shikher.mishra@yahoo.com");

        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        db.child(userId).setValue(u).addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(Task<Void> task) {
                sync.countDown();

            }
        });
        try{
            sync.await();

        }

        catch (Exception e)
        {
            System.out.print("there is an exception here in sync.await()");
        }

现在运行此代码后，值不会在控制台插入到数据库中。如何将值插入 Firebase 的数据库？

用户类是:

package com.example.hsports.galleryusingimageswitcher; /**
 * Created by I324671 on 11/7/2016.
 */

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;




public class User {

public String name;
 public String email;

 public User(){
 }
 public User(String name,String email)
 {
  this.name=name;
  this.email=email;
 }

}

Answer 1

您缺少 User 模型类属性的 getter 方法。

来自 Read and Write Data on Android

Pass a custom Java object, if the class that defines it has a default constructor that takes no arguments and has public getters for the properties to be assigned.

public class User {
    public String name;
    public String email;

    public User() {}
    public User(String name,String email) {
        this.name=name;
        this.email=email;
    }
    public String getName() {
        return this.name;
    }
    public String getEmail() {
        return this.email;
    }
}

这应该有效。 :)