[feat global_unity_controller] Update examples to null safety #737
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Note
This is the same change as #732, but based on the global_unity_controller feature branch #733 as requested.
In that branch only
api_screen.dart
was already updated for the new API changes, so the other pages might still be outdated.Description
The example code can't simply be pasted into a modern flutter project. It will show errors, mainly due to null-safety changes.
Given that the plugin supports null-safety from version 4.2.0 (18 months ago), it's safe to update the example.
The last commit is a small cleanup by following most suggestions of flutter_lints.
Type of Change