App Widget with ViewModel and Lifecycleowner

Issue

I use MVVM in my project. But when i create App Widget he does not support LifecycleOwner in updateAppWidget()

var model: CurrencyViewModel
model = ViewModelProvider(this).get(CurrencyViewModel::class.java)

Do I have a chance to access the model from App Widget?

Solution

That's not what the ViewModelProvider is meant for. When the widget is running the activity might be destroyed together with it's ViewModels. The AppWidgetProvider itself doesn't really have a lifecycle.

If you want to get data from the App into the App Widget you should save it in SharedPreferences or a database.

/**
     * Creates a {@link ViewModelProvider}, which retains ViewModels while a scope of given Activity
     * is alive. More detailed explanation is in {@link ViewModel}.
     * <p>
     * It uses the {@link FragmentActivity#getDefaultViewModelProviderFactory() default factory}
     * to instantiate new ViewModels.
     *
     * @param activity an activity, in whose scope ViewModels should be retained
     * @return a ViewModelProvider instance
     * @deprecated Use the 'by viewModels()' Kotlin property delegate or
     * {@link ViewModelProvider#ViewModelProvider(ViewModelStoreOwner)},
     * passing in the activity.
     */
    @Deprecated
    @NonNull
    @MainThread
    public static ViewModelProvider of(@NonNull FragmentActivity activity) {
        return new ViewModelProvider(activity);
    }

Answered By - einUsername