我的代码有问题,我试图在片段之间传递参数,但是
java.lang.IllegalArgumentException: Required argument "name" is missing and does not have an android:defaultValue
在运行它时会出现异常。我仍然是一个初学者,所以我不能真正说出问题出在哪里。
class ListNotesFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val binding = DataBindingUtil.inflate<FragmentListNotesBinding>(inflater, R.layout.fragment_list_notes, container, false)
val application = requireNotNull(this.activity).application
val args = ListNotesFragmentArgs.fromBundle(arguments!!).name
val dataSource = NoteDatabase.getInstance(application).noteDatabaseDao
val viewModelFactory = ListNoteViewModelFactory(args, dataSource)
val listNoteViewModel = ViewModelProviders.of(this, viewModelFactory).get(ListNoteViewModel::class.java)
binding.listNoteViewModel = listNoteViewModel
binding.lifecycleOwner = this
binding.addButton.setOnClickListener{
this.findNavController().navigate(R.id.action_listNotesFragment_to_detailNoteFragment)
}
listNoteViewModel.navigateToDetailNoteFragment.observe(viewLifecycleOwner, Observer{
it?.let {
this.findNavController().navigate(ListNotesFragmentDirections
.actionListNotesFragmentToDetailNoteFragment(it.noteId))
listNoteViewModel.doneNavigating()
}
})
return binding.root
}
}