android - 使用Source.Server但用户未连接到互联网时，如何获取Firestore错误代码？

Question

如果用户未连接到互联网，我会收到这样的错误消息，我将源设置为Source.Server:

failed to get document from server. (However, this document does exist in the local cache. Run again without setting to SERVER to retrieve the cached document.)

我想编写自己的错误消息，实际上我可以对消息进行硬编码，像这样

if (message == "failed to get document from server ........") {
   showToast("showing my own message here")
}

但是它很容易中断，例如，如果firebase sdk更改错误消息字符串。是否有任何错误代码或枚举错误可识别此错误？

这是代码

fun getUserData(source: Source = Source.SERVER, userID: String, completion: (user: User?, errorMessage:String?) -> Unit) {

        db.document("users/${userID}").get(source).addOnSuccessListener { documentSnapshot ->

            if (documentSnapshot == null || !documentSnapshot.exists()) {
                completion(null,"Account is not found")
                return@addOnSuccessListener
            }

            val userData = documentSnapshot.data ?: return@addOnSuccessListener
            val user = User(userData)
            completion(user,null)


        }.addOnFailureListener {
            completion(null,it.localizedMessage) // error message comes from here
        }


    }

Answer 1

传递给故障侦听器回调的异常的类型为FirebaseFirestoreException。该类包含一个确定确切错误的正式Code类型。我不知道会是哪一种，但是我最好您可以通过检查结果来弄清楚。如果实际上由于某种原因没有代码，请尝试在the Firebase SDK GitHub上提交问题。