MapView Crashes (app close)

[S-Man42]

The MapView is crashing when it contains many lines after some zooming/panning actions.

Adding several points: Zoom/Pan, everything's fine. Adding some lines between the points: Zoom/Pan: Memory increases, map lags, and finally the app closes. (See memory graphs attached below)

Maybe not reproducable on emulator, maybe needs a physical device for debugging. (Enable debugging and USB options; for seeing graph use Chrome devtools: https://docs.flutter.dev/development/tools/devtools/overview)

[Mike-3]

I have this exception in the emulator.

E/flutter (15029): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'double' is not a subtype of type 'Map<String, dynamic>' E/flutter (15029): #0 restoreJsonMapViewData (package:gc_wizard/persistence/map_view/json_provider.dart:99:30) E/flutter (15029): #1 MapViewPersistenceAdapter.setJsonMapViewData (package:gc_wizard/widgets/tools/coords/map_view/mapview_persistence_adapter.dart:259:22) E/flutter (15029): #2 GCWMapViewState._buildEditButtons. (package:gc_wizard/widgets/tools/coords/map_view/gcw_mapview.dart:626:62) E/flutter (15029): #3 GCWPasteButtonState._buildMenuItems.. (package:gc_wizard/widgets/common/gcw_paste_button.dart:76:32) E/flutter (15029): #4 _rootRunUnary (dart:async/zone.dart:1434:47)

But I haven't gotten the app to crash in the emulator yet.

[S-Man42]

looks interesting

[Mike-3]

on web Error: MissingPluginException(No implementation found for method checkPermissionStatus on channel flutter.baseflow.com/permissions/methods) but no crash

[S-Man42]

It must have something to do with the MapLines. See following memory graph:

1. First constant part: Heavy zooming and panning only with points. Nothing happens.
2. Not so quiet part (but still overall constant memory): Some number of points but connected through a Polyline. No action, just displaying
3. Heavy increasing memory allocation: Zooming and panning with line until app crashes.

[S-Man42]

Example File (rename ZIP to KML)

[S-Man42]

No idea... do not find it...

[ludoo0d0a]

Can I get the exact detailed step-by-step scenario to reproduce this issue, please ?

[S-Man42]

Well it's quite easy:

1. Open Map

• Version A: Create many points and lines inbetween (e.g. Toggle "Lines" Button and simply paint new points by long press onto the map). I mean really many many lines

• Version B: Instead creating the lines manually, you can take the the sample file added above -> Rename the .ZIP to .KML and import it to the Map ("Open" button).

  3. Then pan and zoom the map a bit or a bit more and it should crash the app at some point.

As already said: The crash maybe CANNOT reproduced on an emulator (or web), only on a physical device.

[S-Man42]

Reproducable vids:

[S-Man42]

Can anybody still reproduce this?