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Currently we're automatically registering plugins both when the FlutterEngine is constructed and in the `flutter create` template, when FlutterActivity#configureFlutterEngine is called. The initial registration is too early to contain a reference to the activity and the second registration can cause problems in some plugins. This alters the flow so automatic registration happens in two discrete places, and contains the `activity` in its first and only call for most apps. 1. We're no longer automatically registering plugins on `FlutterEngine` in any of our activities/fragments at construction time. But since the FlutterEngine default constructor still automatically registers plugins, anyone constructing the engine themselves (for example, in a service) is still going to get automatic registration at `FlutterEngine` instantiation time. 2. We now automatically register plugins in the base `FlutterActivity`'s `configureFlutterEngine` hook. Anyone using `FlutterActivity` (or `FlutterFragment`) should be automatically registered once that hook is called. Right now the `flutter create` template overrides the base class method with a subclass that registers everything manually in the same spot. But with this in place we can safely recommend to remove the subclass and rely on this hook to automatically register going forward. Registering at this time means `activity` is set correctly.
Flutter Engine
Flutter is Google's mobile app SDK for crafting high-quality native interfaces in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.
The Flutter Engine is a portable runtime for hosting Flutter applications. It implements Flutter's core libraries, including animation and graphics, file and network I/O, accessibility support, plugin architecture, and a Dart runtime and compile toolchain. Most developers will interact with Flutter via the Flutter Framework, which provides a modern, reactive framework, and a rich set of platform, layout and foundation widgets.
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