我正在嘗試使用登錄驗證表單，但程式停止然后到達第二個if，并且我的電子郵件輸出無效。運行清晰，沒有錯誤。無法弄清楚我做錯了什么以及為什么emailList為空
private fun logIn() {
val email = binding.editEmailAddress.text.toString()
val password = binding.editPassword.text.toString()
if (inputCheck(email, password)) {
mLoginViewModel = ViewModelProvider(this)[LoginViewModel::class.java]
val emailList = mLoginViewModel.getUserEmail(email)
if (emailList != null) {
if (emailList.password == password) {
Toast.makeText(requireContext(), "Logged in as $email", Toast.LENGTH_LONG)
.show()
findNavController().navigate(R.id.action_loginFragment_to_listFragment)
} else {
Toast.makeText(requireContext(), "Invalid password", Toast.LENGTH_SHORT).show()
}
} else {
Toast.makeText(requireContext(), "Invalid email", Toast.LENGTH_SHORT).show()
}
} else {
Toast.makeText(requireContext(), "Fill out blank fields", Toast.LENGTH_LONG).show()
}
}
private fun inputCheck(email: String, password: String): Boolean {
return !(TextUtils.isEmpty(email) || TextUtils.isEmpty(password))
}
登錄視圖模型
fun getUserEmail(email: String): User? {
var checker: User? = null
viewModelScope.launch(Dispatchers.IO) {
checker = repository.getUserEmail(email)
}
return checker
}
uj5u.com熱心網友回復：
fun getUserEmail(email: String): User? {
var checker: User? = null
viewModelScope.launch(Dispatchers.IO) {
checker = repository.getUserEmail(email)
}
return checker
// Will return null always because this is not waiting to assign value by above repository method
}
說明你可以做到這一點
suspend fun getUserEmail(email: String): User? {
return repository.getUserEmail(email)
}
在活動或片段中
mLoginViewModel = ViewModelProvider(this)[LoginViewModel::class.java]
lifecycleScope.launch {
val emailList = mLoginViewModel.getUserEmail(email)
}
不知道你在上面的代碼中遇到了什么錯誤，如果這不起作用然后使用下面的代碼
mLoginViewModel = ViewModelProvider(this)[LoginViewModel::class.java]
CoroutineScope(Dispatchers.IO).launch {
val emailList = mLoginViewModel.getUserEmail(email)
withContext(Dispatchers.Main){
//Do whatever with emailList
}
}
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