packages/url_launcher/url_launcher_macos/example/android/app/src/main/java/io/flutter/plugins/urllauncherexample/MainActivity.java

package io.flutter.plugins.urllauncherexample;

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugins.urllauncher.UrlLauncherPlugin;

public class MainActivity extends FlutterActivity {
  @Override
  public void configureFlutterEngine(FlutterEngine flutterEngine) {
    flutterEngine.getPlugins().add(new UrlLauncherPlugin());
  }
}