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Android "back" quits the app completely #638

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@gnprice

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@gnprice

Repro steps:

  • On Android, launch the app. Wait for data to load.
  • Swipe back several times, until you're back at the system home screen.
  • Launch the app again.
  • Actual: The app has to load the data again from scratch.
  • Expected: The app was still running in the background, so that the data is all ready.

This is an upstream Flutter issue:

The expected behavior is new in Android 12 (so in 2021); before that, our actual behavior was expected. See Android docs:
https://developer.android.com/about/versions/12/behavior-changes-all#back-press

I don't think there's a particularly straightforward workaround for us within the app, but hopefully it'll get fixed upstream. (So filing this issue mainly to track that this is a known issue and what the root cause is, in case people notice it again in the future.) Here's my summary of the state of the issue: flutter/flutter#117061 (comment)

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    a-AndroidIssues specific to Android, or requiring Android-specific worka-homeThe home screens of the app; finding and starting conversationsupstreamWould benefit from work in Flutter or another upstream

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