Question

当我添加EventListener来检查键入的用户电话号码是否存在于Firebase Realtime数据库中的所有电话号码中时，我一直试图在OnDataChange方法内进行循环：

    val telephoneInput: String = telephone.text.toString()
var numberExistInDataBase = false

refDataBaseApp.addValueEventListener(object : ValueEventListener {
   override fun onCancelled(p0: DatabaseError) {
       Log.i(TAG, "Estoy en onCancelled")
   }
   override fun onDataChange(dataSnapshot: DataSnapshot) {
       Log.i(TAG, "Estoy en OnDataChange")
       Log.i(TAG, "Outside For el userPhoneInput $telephoneInput")
       for (snapshot in dataSnapshot.children) {
           //Log.i(TAG,"For snapshot app_user_phone $snapshot")
           var userPhoneAppDatabase = snapshot.child("app_user_phone").value
           Log.i(TAG, "Snapshot Child userPhoneAppDatabase $userPhoneAppDatabase")
           if (telephoneInput == userPhoneAppDatabase) {
               Log.i(TAG, "userPhoneInput $telephoneInput")
               Log.i(TAG, "userPhoneAppDatabase $userPhoneAppDatabase")
               numberExistInDataBase = true
               Log.i(TAG, "numberExistInDataBase $numberExistInDataBase")
               alertDialogChangeTelephone()
               telephone.error = "Votre numéro de téléphone est déjà enregistré"
               break
} else {
        numberExistInDataBase = false
    }

}

if (numberExistInDataBase == true) {
   Log.i(TAG, "number exist true = $numberExistInDataBase")

} else{
signUpUser ()
}

我按以下顺序尝试：

first->我键入一个我知道它存在的数字如果数据库中存在键入的数字，它将返回显示AlertDialog，并且不会执行signUpUser。

第二个->我输入一个我不知道的数字。问题是当键入的数字在数据库中不存在时。第一个循环表明不存在。但是在以下循环中，它显示AlertDialog（好像它存在）。之后，将创建signUpUser方法。

当我查看日志时，似乎已键入的数字已保存在缓存中，这就是显示AlertDialog的原因。这意味着它将我第一次输入而不是最后一个输入的数字作为inputPhoneNumber。

所以问题是：为什么将输入的第一个数字保存在缓存中？循环发生了什么？非常感谢您的帮助！

日志：首先->

     I/LOGIN_FRAGMENT: Estoy al principio
 I/LOGIN_FRAGMENT: Estoy en OnDataChange
 I/LOGIN_FRAGMENT: Outside For el userPhoneInput 0616747368
 I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0623578561
 I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0616747368
 I/LOGIN_FRAGMENT: userPhoneInput 0616747368
 I/LOGIN_FRAGMENT: userPhoneAppDatabase 0616747368
 I/LOGIN_FRAGMENT: numberExistInDataBase true
 I/LOGIN_FRAGMENT: aqui viene el alert dialog
 I/LOGIN_FRAGMENT: number exist true = true

秒->

 I/LOGIN_FRAGMENT: Estoy al principio
     I/LOGIN_FRAGMENT: Estoy en OnDataChange
     I/LOGIN_FRAGMENT: Outside For el userPhoneInput 0603254542
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0623578561
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0616747368
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0699268704
     I/LOGIN_FRAGMENT: number does not exist false = false
     I/LOGIN_FRAGMENT: Estoy en OnDataChange
     I/LOGIN_FRAGMENT: Outside For el userPhoneInput 0616747368
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0623578561
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0616747368
     I/LOGIN_FRAGMENT: userPhoneInput 0616747368
     I/LOGIN_FRAGMENT: userPhoneAppDatabase 0616747368
     I/LOGIN_FRAGMENT: numberExistInDataBase true
     I/LOGIN_FRAGMENT: aqui viene el alert dialog
     I/LOGIN_FRAGMENT: number exist true = true
     I/LOGIN_FRAGMENT: Estoy en OnDataChange
     I/LOGIN_FRAGMENT: Outside For el userPhoneInput 0603254542
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0623578561
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0616747368
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0699268704
     I/LOGIN_FRAGMENT: Snapshot Child userPhoneAppDatabase 0603254542
     I/LOGIN_FRAGMENT: userPhoneInput 0603254542
     I/LOGIN_FRAGMENT: userPhoneAppDatabase 0603254542
     I/LOGIN_FRAGMENT: numberExistInDataBase true
     I/LOGIN_FRAGMENT: aqui viene el alert dialog
     I/LOGIN_FRAGMENT: number exist true = true

onDataChange请求保存缓存数据Firebase实时数据库

0 个答案: