Currently the native interop via PlatformMessages requires registering the native endpoint with FlutterView, e.g.:

public class MyActivity extends FlutterActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        new BatteryPlugin(this).installInto(getFlutterView());
    }

This will be cumbersome once we have published plugins that developers can declare a dependency on (#7816). They would have to write native code to 'wire up' the native code that came from the plugin.

Ideally they should just have to declare the dependency in pubspec.yaml, call flutter packages get, and then be ready to call the plugin's Dart interface and have all the wiring handled automagically as part of building/running the app.