无法在Kotlin中获得Firebase当前用户 [英] Unable to get firebase current user in kotlin

问题描述

我正在将FirebaseAuth集成到我正在构建的Android应用程序中.通过添加SDK，下载并添加google-services.json文件，我已成功将Firebase集成到了应用程序中.

I am integrating FirebaseAuth into an Android app that I am building. I have successfully integrated firebase into the app by adding the SDK, downloading and adding the google-services.json file.

当我尝试注册新用户时出现问题.该用户已添加到Firebase控制台，但我无法检索已登录的用户来更新名称.这是我在其中使用该片段的代码.

The problem occurs when I try to Sign Up a new user. The user gets added to firebase console but I cannot retrieve the signed in user to update the name. This is the code from the fragment I am using it in.

requireActivity().let {
    val user = authenticationService.signUpWithEmailAndPassword(email, password)

    user?.let {
            authenticationService.updateUser(it, name)
            navigationService.openHomeScreen()//open next creen
    }
}

authenticationService中的注册功能

the signup function in the authenticationService

fun signUpWithEmailAndPassword(email: String, password: String): FirebaseUser? {
    signOutCurrentUser()
     firebaseAuth.createUserWithEmailAndPassword(email, password)
    return firebaseAuth.currentUser
}

更新用户功能

fun updateUser(user: FirebaseUser?, name: String) {
    val profileUpdates = UserProfileChangeRequest.Builder().apply {
        displayName = name
    }.build()
    user?.updateProfile(profileUpdates)?.addOnCompleteListener { task ->
        if (task.isSuccessful) {
            Timber.d("User profile updated.")
        }
    }
}

退出当前用户功能

private fun signOutCurrentUser() {
    firebaseAuth.currentUser?.let {
        firebaseAuth.signOut()
    }
}

问题在于用户已添加成功，但firebaseAuth.currentUser始终返回null.

The issue is that user is Added successfully but firebaseAuth.currentUser returns null always.

我尝试过的事情:

• 添加authStateListener
• 添加onSuccessListener
• 添加onCompleteListener

请帮助一个兄弟

推荐答案

在Firebase中创建用户是一项异步操作(就像大多数涉及基于云的API的调用一样)，这可能需要一些时间才能完成.在您的return firebaseAuth.currentUser代码运行时，尚未完成用户创建.

Creating a user in Firebase is (like most calls involving cloud-based APIs) an asynchronous operation, which may take time to complete. By the time your return firebaseAuth.currentUser code runs, the user creation has not been completed yet.

如果您简单地将代码与完成处理程序一起在单个块中运行，您会发现它可以正常工作:

If you simply the code to run in a single block, with a completion handler, you'll see that it works fine:

firebaseAuth.createUserWithEmailAndPassword(email, password)
  .addOnCompleteListener(this) { task ->
    if (task.isSuccessful) {
        val user = auth.currentUser

        val profileUpdates = UserProfileChangeRequest.Builder().apply {
            displayName = name
        }.build()
        user?.updateProfile(profileUpdates)?.addOnCompleteListener { task ->
            if (task.isSuccessful) {
                Timber.d("User profile updated.")
            }
        }
    } else {
        // If sign in fails, display a message to the user.
        Log.w(TAG, "createUserWithEmail:failure", task.exception)
        Toast.makeText(baseContext, "Authentication failed.",
                Toast.LENGTH_SHORT).show()
        updateUI(null)
    }

    // ...
  }

另请参阅:

• getContactsFromFirebase()方法返回空列表
• Firebase在方法外部检索数据为空
• 从addValueEventListener Firebase中检索字符串
• 在Firebase Listener中设置Singleton属性值 (它显示了使用信号量制作代码块，但在我上次尝试时在Android上不起作用).

• getContactsFromFirebase() method return an empty list
• Firebase retrieve data Null outside method
• Retrieve String out of addValueEventListener Firebase
• Setting Singleton property value in Firebase Listener (which shows using semaphores to make the code block, but which didn't work on Android when I last tried it).

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