How does Android Jetpack's SavedStateViewModelFactory work?

Question

my viewmodel-savestate version is
implementation 'androidx.lifecycle:lifecycle-viewmodel-savedstate:1.0.0-alpha03'

in version 1.0.0-alpha01 ,i can use

 MyViewModel myVM = new ViewModelProvider(this, new SavedStateVMFactory(this)).get(MyVM.class);

to create viewmodel with savestate, but in version 1.0.0-alpha03 ,

SavedStateVMFactory 

cant work , i need to use new SavedStateViewModelFactory but i dont konw what is the second params means, the code may look like this below:

        myVM = new ViewModelProvider(this, new SavedStateViewModelFactory(getApplication(),xxxxxxx)).get(MyVM.class);

and i cant find any document about this in android developer website, sad

Answer 1

As per the SavedStateRegistryOwner documentation, both Fragment, and AppCompatActivity implement SavedStateRegistryOwner, so you can just pass in this:

 myVM = new ViewModelProvider(this,
     new SavedStateViewModelFactory(getApplication(), this))
     .get(MyVM.class);

Just make sure you're using AppCompat 1.1.0, which is when AppCompatActivity (and its base class, FragmentActivity and ComponentActivity) started to implement SavedStateRegistryOwner.