Google Maps Wont restoreState properly when navigating through bottom nav

Environment details

1. library: com.google.maps.android:maps-compose:2.1.0

Steps to reproduce

1. clone this repo
2. add your google api key to the manifest file
3. Quickly navigate between the bottom tabs and check if the maps is loaded properly
4. When navigating quickly with the bottom tabs the maps wont restore its state eg. camera position, markers

Observation

The maps will load properly even if we navigate quickly on the bottom tabs when the starting route of nav host is the map to reproduce.

1. Change the AnimatedNavHost start destination from

AnimatedNavHost(
         navController = navController,
         startDestination = Screen.Other.route
     )

to

AnimatedNavHost(
            navController = navController,
            startDestination = Screen.Map.route
        )

and it will work just fine.

Here is a sample video of the bug

[arriolac]

Looks like this issue happens you’re in the tab displaying the map, and quickly tap out and back in (before the crossfade animation completes). In this specific scenario, the MapView is in the state such that the GoogleMap composable never left the composition (and so nodes aren’t readded) but the MapView has been recreated (i.e. went through an ON_STOP, followed by an ON_CREATE > ON_START > ON_RESUME). I believe the fix here would be to propagate the saved instance state Bundle across the various MapView lifecycle events. However, there are no hooks in the androidx.lifecycle library to obtain that bundle. Will try to figure out a workaround for this.

Edit: saving instance state will only restore some properties of the map (like the camera’s position). Drawn objects like markers will have to be readded. The closest thing to a workaround for now is to shorten the crossfade duration to reduce the occurrence of this bug.

[googlemaps-bot]

🎉 This issue has been resolved in version 2.2.1 🎉

The release is available on:

• v2.2.1
• GitHub release

Your semantic-release bot 📦🚀