SavedStateViewModelFactory constructed with empty constructor

Question

After updating navigation component and lifecycle viewmodel version to 2.5.0-alpha01 I have got following issue.

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.atcc.aewp/com.atcc.aewp.activity.SplashActivity}: java.lang.UnsupportedOperationException: SavedStateViewModelFactory constructed with empty constructor supports only calls to create(modelClass: Class, extras: CreationExtras).

Exception throws when view model is loaded

open class BaseActivity : AppCompatActivity() {

    private val appLanguageViewModel: AppLanguageViewModel by viewModels()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        appLanguageViewModel.result.observe(this) {
            ...
        }
    }
}

Here is my view model class

class AppLanguageViewModel : ViewModel() {

    private val languageLiveData = MutableLiveData<Event<ApplicationLanguage>>()

    val result: LiveData<Event<ApplicationLanguage>> = languageLiveData

    fun setLanguage(applicationLanguage: ApplicationLanguage) {
        if (LanguagePreferences.instance().setLanguage(applicationLanguage.name)) {
            languageLiveData.postValue(Event(applicationLanguage))
        }
    }
}

Answer 1

In our case Sinan Kozak work around did not work. The current issues we were facing where because we were using the following versions of navigation and lifecycle

lifecycle

implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.1'
implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.4.1'

navigation

implementation 'androidx.navigation:navigation-fragment-ktx:2.5.0-alpha01'
implementation 'androidx.navigation:navigation-ui-ktx:2.5.0-alpha01'

This resulted in Biometrics on the phone not working. So, the solution our end was to revert to the previous stable release of the navigation dependencies

implementation 'androidx.navigation:navigation-fragment-ktx:2.4.1'
implementation 'androidx.navigation:navigation-ui-ktx:2.4.1'

I guess the best rule of thumb is do not use alpha build dependencies in production