调用片段构造函数导致异常，kotlin?

Question

我正在使用导航控制器导航到另一个片段

导航到第二个片段

private fun moveToNextScreen(userId: String) {
val bundle = bundleOf("userId" to userId)
binding.googleLogin.findNavController().navigate(
R.id.action_loginFragment_to_signupFragment, bundle
)
}

我正在导航到的片段

class UserSetupFragment : Fragment() {
private lateinit var binding: FragmentUserSetupBinding
var optionCb = mutableListOf<AppCompatCheckBox>()
var optionsList =
ArrayList<String>(Arrays.asList(*resources.getStringArray(R.array.profile_options)))
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
binding = FragmentUserSetupBinding.inflate(inflater, container, false)
return binding.getRoot()
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
createOptionsCheckBox()
}
private fun createOptionsCheckBox() {
for (option in optionsList) {
val checkBox = AppCompatCheckBox(activity)
checkBox.setText(option)
checkBox.setTextColor(ContextCompat.getColor(requireActivity(), android.R.color.black));
optionCb.add(checkBox)
binding.optionsLayout.addView(checkBox)
}
}
}

我收到异常

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=66957, result=-1, data=Intent { (has extras) }} to activity {com.patient.reach52/com.patient.reach52.view.authenticate.AuthenticateActivity}: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.patient.reach52.view.authenticate.UserSetupFragment: calling Fragment constructor caused an exception

这边怎么了？

Answer 1

在片段附加到活动之前，无法访问resources。所以你必须延迟optionsList的实例化

class UserSetupFragment : Fragment() {
lateinit var optionsList: List<String>
override fun onAttach(context: Context) {
super.onAttach(context)
optionsList = resources.getStringArray(R.array.profile_options).toList()
}
...

Answer 2

之前的评论是正确的原因 - 您尝试过早访问资源
但我没有看到正确的解决方案
避免使用 lateinit
对于当前情况尝试

val optionsList by lazy {
resources.getStringArray(R.array.profile_options).toList()
}