Flutter Android Lifecycle Plugin

import androidx.lifecycle.Lifecycle;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.embedding.engine.plugins.activity.ActivityAware;
import io.flutter.embedding.engine.plugins.FlutterPlugin.FlutterPluginBinding;
import io.flutter.embedding.engine.plugins.lifecycle.FlutterLifecycleAdapter;

public class MyPlugin implements FlutterPlugin, ActivityAware {
  @Override
  public void onAttachedToActivity(ActivityPluginBinding binding) {
    Lifecycle lifecycle = FlutterLifecycleAdapter.getActivityLifecycle(binding);
    // Use lifecycle as desired.
  }

  //...
}