将Firebase数据快照反序列化为Kotlin数据类

Question

嗨我有一个Kotlin数据类如下

data class User (
        @get:Exclude val gUser: Boolean,
        @get:Exclude val uid: String,
        @get:PropertyName("display_name") val displayName: String,
        @get:PropertyName("email") val email: String,
        @get:PropertyName("account_picture_url") val accountPicUrl: String,
        @get:PropertyName("provider") val provider: String
)

我能够没有问题地序列化对象.但是在执行firebase查询时,我无法反序列化对象.目前这是我正在做的获取数据

_firebaseReference.child(getString(R.string.firebase_users_key)).child(user.uid)
        .setValue(user).addOnCompleteListener{
    _firebaseReference.child("users").child(user.uid)
            .addListenerForSingleValueEvent(object : ValueEventListener {
        override fun onCancelled(p0: DatabaseError) {

        }

        override fun onDataChange(p0: DataSnapshot) {
            if (p0.exists()) {
                val userHash = p0.value as HashMap<*, *>
                var currentUser: User
                if (userHash[getString(R.string.provider_key)]
                        != getString(R.string.provider_google)) {
                    currentUser = User(false, p0.key!!, 
                            userHash["display_name"].toString(), 
                            userHash["email"].toString(),
                            userHash["account_picture_url"].toString(), 
                            userHash["provider"].toString())
                } else {
                    currentUser = User(true, p0.key!!, 
                            userHash["display_name"].toString(), 
                            userHash["email"].toString(), 
                            userHash["account_picture_url"].toString(), 
                            userHash["provider"].toString())
                }
            }
        }

    })
}

这只是我正在努力练习我的Kotlin的一个测试项目,但这是我想要弄清楚的.

如果我完全错误请告诉我,任何建议将不胜感激

谢谢

Answer 1

Firebase需要一个空构造函数才能反序列化对象:

data class User(
        @Exclude val gUser: Boolean,
        @Exclude val uid: String,
        @PropertyName("display_name") val displayName: String,
        @PropertyName("email") val email: String,
        @PropertyName("account_picture_url") val accountPicUrl: String,
        @PropertyName("provider") val provider: String
) {
    constructor() : this(false, "", "", "", "", "")
}

您可以像这样声明它并提供一些默认值以便能够调用主构造函数,或者您可以为所有参数声明默认值:

data class User (
        @Exclude val gUser: Boolean = false,
        @Exclude val uid: String = "",
        @PropertyName("display_name") val displayName: String = "",
        @PropertyName("email") val email: String = "",
        @PropertyName("account_picture_url") val accountPicUrl: String = "",
        @PropertyName("provider") val provider: String = ""
)

然后将为您创建各种构造函数,包括一个空构造函数.

如果序列化存在问题,可能是因为ide生成的getter和setter,请尝试使用@get和@set注释加强它们:

data class User (
        @Exclude val gUser: Boolean = false,
        @Exclude val uid: String = "",
        @set:PropertyName("display_name") 
        @get:PropertyName("display_name")
        var displayName: String = "",
        @PropertyName("email") val email: String = "",
        @set:PropertyName("account_picture_url")
        @get:PropertyName("account_picture_url")
        var accountPicUrl: String = "",
        @PropertyName("provider") val provider: String = ""
)