Crash due to activity.onBackPressed() when removing fragment hosting a WebView in AndroidView {} + FADE

[uvaysss]

Recently updated the target/compile sdk to 33 and did get some weird navigation issues. When I try to call requireActivity().onBackPressed() from a Fragment my app freezes for some time and closes. And the weirdest thing is that this happens only with FragmentTransaction.TRANSIT_FRAGMENT_FADE.

I'm overriding methods of DefaultFragmentStateChanger onForwardNavigation, onBackwardNavigation, onReplaceNavigation.

[uvaysss]

Also I tried updating to the last recommendation with onBackPressedDispatcher, but nothing has changed, looks like the animation is to long (weird, I know), but looks like a race condition of animation.

[Zhuinden]

Hello, unfortunately I can't really do much without a minimal sample that reproduces this. TRANSIT_FRAGMENT_FADE is built into fragments, and shouldn't cause freezes at all.

If you overrode onForwardNavigation, onBackwardNavigation, onReplaceNavigation, make sure you don't call super.onForwardNavigation and so on.

[uvaysss]

Could you, please, just set this animation to any of your project to reproduce it? I will later prepare some sample project for this use case.

[Zhuinden]

I have been using this animation and did not encounter this issue.

[Zhuinden]

Actually, now that I recall, the one time I did have some lag was when my fragmentKey.toString() took non-negligible time.

[uvaysss]

Sorry for the delay.

I think I found the pattern, it looks like it happens when I navigate back from a "heavy" screen, in my case it's a screen with webview. And it doesn't happen consistent, sometimes the navigation works fine.

I have an open source project where you can reproduce the bug - https://github.com/Jawziyya/azkar-android/tree/feature/hadith.

Sorry, but the app is only in russian language, but you will find a Settings menu on the main screen, it will open a webview from where you can than than navigate back with close button. Here is the settings screen - https://github.com/Jawziyya/azkar-android/tree/feature/hadith/app/src/main/java/io/jawziyya/azkar/ui/settings.

Also I have noticed it happens only when I navigate back through calling requireActivity().onBackPressed(), when I go back by the system navigation it's fine, weird.

[uvaysss]

Also I've notice now, that it look more like app crash, but I don't see any logs about it, maybe there is some system crash.

EDIT. found in the logs

Exception thrown during dispatchAppVisibility Window{a79cf22 u0 io.jawziyya.azkar/io.jawziyya.azkar.ui.AppActivity EXITING} android.os.DeadObjectException

[Zhuinden]

Your coroutine scope should be protected val coroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)

And you are not setting the disposition strategy on the Fragment's ComposeView setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed)

Maybe one of these is the cause

[uvaysss]

I have there an extensions function, that sets the strategy createComposeView

[uvaysss]

Also I don't see a problem not having the right dispatcher, because in this case I'm not calling it.

[Zhuinden]

I enabled hardware acceleration on your WebView.

            webView.clipToOutline = true
            webView.setLayerType(View.LAYER_TYPE_HARDWARE, null) // <----
            webView.layoutParams = ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
            )

By adding `webView.setLayerType(View.LAYER_TYPE_HARDWARE, null) it works.

I don't know why it happened, but it is not caused by Simple-Stack. Anyway, if you add that line, it will stop crashing.

[uvaysss]

This is not definitely a simple stack issue.

The funny thing is, that I noticed it also happens when I call requireActivity()::onBackPressed from the material component IconButton onclick, if I use an another custom button with clickable modifier it works fine.. Also I checked if it's called maybe twice, but no, the log show only 1 call of the method..

[Zhuinden]

This is not definitely a simple stack issue.

The funny thing is, that I noticed it also happens when I call requireActivity()::onBackPressed from the material component IconButton onclick, if I use an another custom button with clickable modifier it works fine.. Also I checked if it's called maybe twice, but no, the log show only 1 call of the method..

well as I mentioned, if you add hardware acceleration to the WebView, it stops crashing

I found that this also happened in React Native projects for some reason. One of the fixes said "set 0.99 alpha" which is just funny.

[uvaysss]

That's so weird.

Anyway, thank you for help and quick response!

[uvaysss]

I found that by removing webView.clipToOutline = true fixes the issue too. I think that's very weird that this things are somehow connected, but still they should kept in mind.

I've just recently added this clip function call, because of https://issuetracker.google.com/issues/242463987.

I don't know which solution would be best, but I will probably choose not to use the material component and just add some custom AppBar to solve this bug.