android-kotlin.TypeCastException：无法将null强制转换为非null类型的kotlin.collections.Map

概述我一直在寻找可以广泛帮助我的代码的答案,但是我发现的解决方案对我不起作用.我收到以下错误：kotlin.TypeCastException:nullcannotbecasttonon-nulltypekotlin.collections.Map<kotlin.String,kotlin.Any>FATALEXCEPTION:mainProcess:com.meetH

我一直在寻找可以广泛帮助我的代码的答案,但是我发现的解决方案对我不起作用.

我收到以下错误：

    kotlin.TypeCastException: null cannot be cast to non-null     type kotlin.collections.Map<kotlin.String, kotlin.Any>    FATAL EXCEPTION: main    Process: com.meetHitch.HitchApp, PID: 4021    kotlin.TypeCastException: null cannot be cast to non-null     type kotlin.collections.Map<kotlin.String, kotlin.Any>      at ... helpers.RestAPIKt$getUserProfile ...      at com.Google.androID.gms.tasks.zzj.run(UnkNown Source)      at androID.os.Handler.handleCallback(Handler.java:751)      at androID.os.Handler.dispatchMessage(Handler.java:95)      at androID.os.Looper.loop(Looper.java:154)      at androID.app.ActivityThread.main ...      at java.lang.reflect.Method.invoke(Native Method)      at com.androID.internal.os.ZygoteInit$Method...      at com.androID.internal.os.ZygoteInit.main

我的代码如下：

private val TAG: Stringget() = "RestAPI"private val fUser: FirebaseUser?get() = FirebaseAuth.getInstance().currentUserprivate val uID: String?get() = fUser?.uIDprivate val baseDoc: documentReferenceget() = FirebaseFirestore.getInstance().        collection("users").document(uID!!)private val leadsDoc: documentReferenceget() {    appUser.currentConference?.ID?.let {        return baseDoc.collection("leads").document(it)    }    return baseDoc.collection("leads").document(demoID)}private val conferencesCollection: CollectionReferenceget() =  FirebaseFirestore.getInstance().         collection("conferences")fun getUserProfile(callback: (AppUser) -> Unit) {  // Source can be CACHE, SERVER, or DEFAulT.  val source = Source.DEFAulT  baseDoc.get(source)        .addOnCompleteListener { task ->            if (task.isSuccessful) {                val document = task.result                if (document != null) {                    printnLog(TAG, "Loaded profile for User                     with UID: $uID successfully!")                    val user = AppUser(task.result.data as                                Map<String, Any>)                    callback(user)                } else {                    println("No profile set. Saving initial                              profile...")                    appUser = AppUser(fUser!!)                    setUserProfile()                }            } else {                Log.w(TAG, "getUser:onCancelled",                       task.exception)            }          }        }

我指的是kotlin.TypeCastException: null cannot be cast to non-null type com.midsizemango.databasekotlin.Note,尽管有可能我没有实现,但所有解决方案都没有起作用？在正确的地方.我尝试了“ as？Map”,但出现类型不匹配错误.

解决方法:

使用val user = AppUser(task.result.data as Map< String,Any>)行,使Any变量可为空：

val user = AppUser(task.result.data as Map<String, Any?>)

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