Hello all, I just filed this bug (<https://issuetracker.google.com/issues/261078350>) regarding a cr...

# compose

[zsperske]

Hello all, I just filed this bug (https://issuetracker.google.com/issues/261078350) regarding a crash that occurs when placing an AbstractComposeView inside of a BottomSheetDialog (from the material design library). Wondering if anyone else has run into this before & found a solution. Error starts with:

java.lang.IllegalStateException: ViewTreeLifecycleOwner not found from android.widget.FrameLayout

[zsperske]

java.lang.IllegalStateException: ViewTreeLifecycleOwner not found from android.widget.FrameLayout{7ec5e5f V.E...... ......I. 0,0-0,0 #7f08006f app:id/container}
                                                                                                        at androidx.compose.ui.platform.WindowRecomposer_androidKt.createLifecycleAwareWindowRecomposer(WindowRecomposer.android.kt:349)
                                                                                                        at androidx.compose.ui.platform.WindowRecomposer_androidKt.createLifecycleAwareWindowRecomposer$default(WindowRecomposer.android.kt:324)
                                                                                                        at androidx.compose.ui.platform.WindowRecomposerFactory$Companion$LifecycleAware$1.createRecomposer(WindowRecomposer.android.kt:168)
                                                                                                        at androidx.compose.ui.platform.WindowRecomposerPolicy.createAndInstallWindowRecomposer$ui_release(WindowRecomposer.android.kt:224)
                                                                                                        at androidx.compose.ui.platform.WindowRecomposer_androidKt.getWindowRecomposer(WindowRecomposer.android.kt:299)
                                                                                                        at androidx.compose.ui.platform.AbstractComposeView.resolveParentCompositionContext(ComposeView.android.kt:240)
                                                                                                        at androidx.compose.ui.platform.AbstractComposeView.ensureCompositionCreated(ComposeView.android.kt:247)
                                                                                                        at androidx.compose.ui.platform.AbstractComposeView.onAttachedToWindow(ComposeView.android.kt:279)
                                                                                                        at android.view.View.dispatchAttachedToWindow(View.java:20479)

[Ian Lake]

See the last thread about directly using a BottomSheetDialog (when really you'd run into less problems if you use BottomSheetDialogFragment): https://kotlinlang.slack.com/archives/CJLTWPH7S/p1597245390048100

[Ian Lake]

This isn't unique to BottomSheetDialog, you see the same thing in every non-managed Dialog that doesn't know anything about Compose

[zsperske]

Got it, thanks for the link! If I wanted to avoid using the dialog fragment, I have to manage the ViewTreeLifecyclerOwner myself? I gave that a shot but it didn’t seem to have any effect

[Ian Lake]

You need to create your own LifecycleOwner that matches the Lifecycle of the Dialog. Same for a SavedStateRegistryOwner (and optionally a ViewModelStoreOwner if you want to use ViewModels within the dialog)

[Ian Lake]

These are some of the many things that Fragments do for you in this case

[zsperske]

got it, we don’t use any fragments in the app so I’d need to refactor how we display bottom sheets.

[zsperske]

we have one activity & everything is a View. using https://github.com/Zhuinden/simple-stack

[Ian Lake]

If you upgrade to AppCompat 1.5.0, then AppCompatDialog (the superclass of BottomSheetDialog ) will extend ComponentDialog, which will give you the LifecycleOwner part for free

[Ian Lake]

I filed https://issuetracker.google.com/issues/261162296 to see if ComponentDialog can also implement SavedStateRegistryOwner

[zsperske]

🙏 thanks Ian! much appreciated

[zsperske]

Strangely, during my testing I noticed that the ComponentDialog never gets its setContentView methods called (which is what initializes the LifecycleOwner). The subclass AppCompatDialog doesn’t call super.setContentView and instead calls a delegate method which doesn’t end up leading to the ComponentDialog

[Ian Lake]

Oof, do you mind filing an issue against AppCompat to fix that? https://issuetracker.google.com/issues/new?component=460343&amp;template=1422420

[Ian Lake]

At least there's an easy workaround of just calling the setViewLifecycleOwner with this (i.e., with the ComponentDialog instance that implements LifecycleOwner). That's a lot easier than building a valid owner yourself

[zsperske]

👍 sure I’d be happy to, and yeah I’ve gotten that part done, now just figuring out the differences in the SavedStateRegistryOwner APIs in the newest savedstate artifact (1.2) vs the one appcompat activity uses (1.1.0-beta01)

[zsperske]

Created https://issuetracker.google.com/issues/261314581