Simple java file to separate and decouple Android platform call for Flutter a bit while still not having to publish at all.

GetStringPlugin.java

package com.example.fluttergetstringdriver;

import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.PluginRegistry;

public class GetStringPlugin implements MethodChannel.MethodCallHandler {

    /** Plugin registration. */
    public static void registerWith(PluginRegistry.Registrar registrar) {
        final MethodChannel channel = new MethodChannel(registrar.messenger(), "com.example.plugin");
        channel.setMethodCallHandler(new GetStringPlugin());
    }

    @Override
    public void onMethodCall(MethodCall call, MethodChannel.Result result) {
        if (call.method.equals("plugin_hi")) {
            result.success("Hello from GetStringPlugin");
        } else {
            result.notImplemented();
        }
    }
}