State inside FeatureModule of Hilt simple example is not persisted across process death

[Zhuinden]

dagger/java/dagger/hilt/android/example/gradle/simple/feature/src/main/java/dagger/hilt/android/example/gradle/simple/feature/FeatureModule.kt

Line 30 in c1ddd0c

fun provideData() = FeatureCounter(0)

Not persisting such state can cause unexpected behaviors and bugs, especially if this is used to share state between screens.

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This raises following questions:

1.) if ViewModel is used under the hood for ActivityRetainedComponent, then how do I intercept onCleared() in my custom classes?

2.) if ViewModel is used under the hood for ActivityRetainedComponent, then how do I get a SavedStateHandle into my custom classes?

3.) if ViewModel is not used for ActivityRetainedComponent, how do I get a reference to the SavedStateRegistry into my custom classes?

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Overall, the question boils down to:

• how to save state inside an ActivityRetainedComponent across process death?

[Chang-Eric]

Just FYI, we're going to come back to this issue about Hilt after the official launch. Thanks for filing it though and sorry for the wait!

[Zhuinden]

It's fine, thanks for the reply and will look forward to it 🙂

[Chang-Eric]

Coming back to this, we have plans to make a SavedStateHandle binding available in the ActivityRetainedComponent. You're right though that there is currently no way to handle process death in the ActivityRetainedComponent right now unfortunately.

[Zhuinden]

we have plans to make a SavedStateHandle binding available in the ActivityRetainedComponent.

That would solve it!

BTW, is ActivityRetainedComponent deps inherited into @ViewModelInject annotated ViewModels?

[Chang-Eric]

Yes, @ViewModelInject classes inject themselves from the ActivityRetainedComponent. This is true regardless of what ViewModelOwner is used.