Support FlutterEngine in FlutterPluginRegistry

[chip2n]

FlutterPluginRegistry cannot be used properly with FlutterEngine at the moment, since FlutterRegistrar.messenger() returns an uninitialized FlutterNativeView instead of FlutterEngine.dartExecutor. This makes it hard to use some flutter plugins in embedding scenarios (NPE when attempting to access BinaryMessenger).

https://github.com/flutter/engine/blob/865cb1c986cf5abf93023f9b0bcbafd36a68eca2/shell/platform/android/io/flutter/app/FlutterPluginRegistry.java#L55-L57

https://github.com/flutter/engine/blob/865cb1c986cf5abf93023f9b0bcbafd36a68eca2/shell/platform/android/io/flutter/app/FlutterPluginRegistry.java#L125

Seems like this issue is known since there's a TODO by @matthew-carroll in the code, but didn't find an issue associated with it so I'm creating this one. Has there been any progress on this?

[matthew-carroll]

@chip2n the new Android embedding will come with a new plugin API, too. It was not designed to work with the old plugin registry. I am actively merging experimental code to bring plugins to the new embedding, e.g., flutter-team-archive/engine#8962

Based on the new work, can we close this, or did I misunderstand the issue?

[chip2n]

Thanks for the response. Yeah, I somehow missed that one. Go ahead and close this :)

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.