Koin Sharedviewmodel With Savedstatehandle

I have single activity application and number of fragments. Some of these fragments are using my viewmodel, typically like this: private val myViewModel: MyViewModel by sharedViewM

Solution 1:

Update: as koin 2.1.6 is around, they introduced org.koin.androidx.viewmodel.ext.android.stateSharedViewModel that you can use in your fragments.

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Ok after an hour of digging Koin samples and figuring out a few gotchas:

1. Assuming your view model is something similar to this:

classSavedStateViewModel(val handle: SavedStateHandle, val service: SimpleService) 

2. ...and your DI looks like this:

viewModel { (handle: SavedStateHandle) -> SavedStateViewModel(handle, get()) }

3. Your shared state view model can be consumed in your fragments like this:

val sharedSaved: SavedStateViewModel bysharedViewModel()

4. (important!) You need this declaration in your activity:

lateinitvar savedVm: SavedStateViewModel

5. (important) You need to call this right after super.onCreate(savedInstanceState) in your activity:

savedVm  = getStateViewModel() 

It is important not to use lazy version for the above (stateViewModel).