Any UI update on google_maps_flutter example project gives error "The getter 'bearing' was called on null"

[timtraversy]

This error is in the example code for the google_maps_flutter plugin, in the map_ui file. Almost all of the buttons on this page present the error "The getter 'bearing' was called on null". This is because the building method tries to access the bearing property of the _position variable, but this is set to null by the code at line 59:

https://github.com/flutter/plugins/blob/d451cac0867a9fb8db055dde1785ea599d68db7c/packages/google_maps_flutter/example/lib/map_ui.dart#L57-L61

It seems mapController.cameraPosition is being set to null at some point after the GoogleMapOptions are updated. This error can be fixed by setting _position equal to mapController.options.cameraPosition instead, since this is not null when this function runs.

[timtraversy]

Investigating further: in the maps plugin, in the GoogleMapController.m file, at line 151, cameraPosition is returning nil. And that is because _trackCameraPosition is set to false. If I make cameraPosition just return _mapView.camera, everything works! I think this is the proper fix, but I'm not sure why it ever returned nil. cameraPosition isn't used much throughout the code, so I think this is a safe change.

[timtraversy]

I offered a fix in my PR:
flutter/plugins#898 (comment)

[github-actions]

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