I have ViewModel:
class MyViewModel : ViewModel(){
private val _user = MutableLiveData("")
val user: LiveData<String> = _user
fun onBtnClick(){
Log.i("MyViewModel", "user: ${_user.value}")
}
}
I connected it with fragment layout using:
<data>
<variable
name="viewmodel"
type="com.pkg.pkg.pkg.fragments.concretePkg.MyViewModel" />
</data>
<EditText
...
android:text="@={viewmodel.user}"
android:hint="User" />
And in fragment class in onCreateView method:
binding = DataBindingUtil.inflate(inflater, R.layout.fragment_my_fragment, container, false)
binding.lifecycleOwner = this
// bind viewModel
viewModel = ViewModelProviders.of(this).get(MyViewModel::class.java)
binding.viewmodel = viewModel
// Inflate the layout for this fragment
return binding.root
I can change the EditText value from the fragment or ViewModel class, but when I try to get the value inside the onBtnClick method of the ViewModel in the Logcat I am getting the message: I/MyViewModel: user:
What am I missing here so that two-way data binding works from the other direction too?
I nutshell, data goes from ViewModel/ Fragment to EditText on the interface, but it doesn't flow from EditText on the interface to ViewModel fields/ methods.
Thanks in advance.
------- EDITED ----- I managed to populate everything, but know I am getting this error:
Details: There is no inverse for method getValue, you must add an @InverseMethod annotation to the method to indicate which method should be used when using it in two-way binding expressions
I suppose that is because viewmodel.user is of type LiveData and not of a String. I have written binding adapter:
@BindingAdapter("android:text")
fun setLiveDataText(editText: EditText, liveData: LiveData<String>) {
if(liveData == null){
editText.setText("")
} else {
editText.setText(liveData.value)
}
}
But I am still getting the above message.
