类型不匹配:推断的类型是GoogleSignInAccount?但是GoogleSignInAccount应该是>任务:app:buildInfoGeneratorFdroidDebug [英] Type mismatch: inferred type is GoogleSignInAccount? but GoogleSignInAccount was expected > Task :app:buildInfoGeneratorFdroidDebug

问题描述

我正在尝试将Google登录添加到我的Kotlin中，但是在"user_account"处出现错误.它说:类型不匹配:推断的类型是GoogleSignInAccount?但应使用GoogleSignInAccount" 如何纠正此错误?

I am trying to add google sign-in to my kotlin but I am getting error at "user_account". It says "Type mismatch: inferred type is GoogleSignInAccount? but GoogleSignInAccount was expected" How to rectify this error?

 override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == RC_SIGN_IN) {
            val task: Task<GoogleSignInAccount> = GoogleSignIn.getSignedInAccountFromIntent(data)
            try {
                val user_account = task.getResult(ApiException::class.java)
                firebaseAuthWithGoogle(user_account)
            } catch (e: ApiException) {
                Toast.makeText(this, "Google sign in failed:(", Toast.LENGTH_LONG).show()
            }
        }
    }

推荐答案

这可能是一个较晚的答案，但希望它可以在将来对像我这样的Kotlin初学者有所帮助.

This maybe a late answer, but hopefully it can help the Kotlin beginners like me in the future.

我遇到了完全相同的错误，并进行了以下修改以解决该问题:

I met exactly the same error, and modify as the following part to fix it:

            val user_account : GoogleSignInAccount? = task.getResult(ApiException::class.java)
            firebaseAuthWithGoogle(user_account!!)

您可以参阅Kotlin在线文档零安全，以了解有关以下内容的详细信息: null和"!!"运算符.

You may refer to Kotlin online document Null Safety for the details about null and "!!" operator.

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