映射到对象后的数据快照，对象显示空值

Question

我想从firebase数据库中获取数据，我使用了valueEventListner Datasnapshot包含数据，但是当它映射到User对象时，object会将所有属性显示为null。请建议解决方案

    mDatabaseReference =mFireBaseDatabase.getReference(table_name);
    mDatabaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Log.v(TAG,"user snap shot count:"+dataSnapshot.getChildrenCount());
            // users is arraylist
        users.clear();
                for(DataSnapshot usersnapshot : dataSnapshot.getChildren())
                {
                    Log.v(TAG,"Profile user snap:"+usersnapshot.toString());

                   User user = usersnapshot.getValue(User.class);

                    Log.v(TAG,"user data:"+user.toString());
                }

        }

Answer 1

当您插入时间通过用户对象的数据时，如下所示..

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然后您的代码确定我认为当您读取时间定义firebase实例的数据时..

        User user = new User(name, email, pwd);
    mFirebaseDatabase.child(name).setValue(user);