PluginRegistry无法转换为FlutterEngine

当我将 flutter 更新到版本 1.12.13 时，我发现了这个问题并且无法修复它。我按照发送的 firebase_messaging 教程进行操作并收到以下错误： “错误：类型不兼容：PluginRegistry 无法转换为 FlutterEngine generatedPluginRegistrant.registerWith(注册表); ” 我的代码如下：

package io.flutter.plugins;

import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.os.Build;

public class Application extends FlutterApplication implements PluginRegistrantCallback {
  @Override
  public void onCreate() {
    super.onCreate();
    FlutterFirebaseMessagingService.setPluginRegistrant(this);

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
      NotificationChannel channel = new NotificationChannel("messages","Messages", NotificationManager.IMPORTANCE_LOW);
  NotificationManager manager = getSystemService(NotificationManager.class);
  manager.createNotificationChannel(channel);
    }
  }

  @Override
  public void registerWith(PluginRegistry registry) {
    GeneratedPluginRegistrant.registerWith(registry);
  }
}

替换此代码行：

GeneratedPluginRegistrant.registerWith(registry);

有了这个：

FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));

确保导入：

import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;