Is it possible to use Compose without an AppCompatActivity, and just `android.app.Activity`? I see ...

# compose

[jaqxues]

Is it possible to use Compose without an AppCompatActivity, and just android.app.Activity?

I see that it requires a ViewTreeLifecycleOwner, which can be instantiated and set manually. However the ViewTreeSavedStateRegistryOwner cannot be instantiated, so it must be used with an AppCompatActivity, right?

Is there any way for me to get a ViewTreeSavedStateRegistryOwner without AppCompatActivity or get Compose (specifically ComposeView, which checks for these) to work?

[lewis]

You want to use androidx.activity.ComponentActivity

[jaqxues]

Yeah true, but is there a way to do it without it

[Gabriel]

Why don't you want to use ComponentActivity ?

[jaqxues]

The scenario I want to use it for just 100% requires an Android Activity

[Mark Murphy]

However the ViewTreeSavedStateRegistryOwner cannot be instantiated, so it must be used with an AppCompatActivity, right?

AppCompatActivity comes from a library. Anything that a library author can write, we can write.

We have examples of using Compose in an InputMethodService (https://stackoverflow.com/a/65760080/115145) and from a service showing a system overlay (https://gist.github.com/handstandsam/6ecff2f39da72c0b38c07aa80bbb5a2f). AFAIK, both copied code out of ComponentActivity and adjusted it to suit their needs.

[Gabriel]

From what people have said in other similar thread if you're doing a pure compose app you can just use ComponentActivity, no need for AppCompat

[jaqxues]

Thanks, I was missing that how the SavedStateRegistryController is instantiated and used. I thought it would need an instance that already has implemented the getSavedStateRegistry() . I will try it

[Gabriel]

👍

[jaqxues]

I cannot use anything else then android.app.Activity. It is a pretty special use case, i know. And don't try to convince me that I'm doing it wrong, I know that and there is no other way lol

[Gabriel]

Haha I wont :D