缺少插件异常（在通道dexterous.com/flutter/local_notifications上没有找到方法显示的实现）

Question

我曾尝试用Flutter实现Firebase云消息传递，直到我使用“本地通知”插件来显示通知，我才获得成功

我的通知在前台工作正常，但在后台显示此错误：

[错误：flatter/lib/ui/ui_dart_state.cc（157）]未处理的异常：缺少PluginException（在channel dexterous.com/flatter/local_通知上未找到方法显示的实现）

我使用Firebase Cloud Messaging 6.0。9，本地通知1.2。0.4和最新颤振

这是我的代码：NotificationHandler

import 'package:flutter_local_notifications/flutter_local_notifications.dart';

class NotificationHandler{
  static final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin(); // make it a static field of the class

  static void initNotification()
  {

// initialise the plugin. app_icon needs to be a added as a drawable resource to the Android head project
    var initializationSettingsAndroid = AndroidInitializationSettings('@mipmap/ic_launcher');
    var initializationSettingsIOS = IOSInitializationSettings(
        onDidReceiveLocalNotification: onDidReceiveLocalNotification);
    var initializationSettings = InitializationSettings(
        initializationSettingsAndroid, initializationSettingsIOS);
    flutterLocalNotificationsPlugin.initialize(initializationSettings,
        onSelectNotification: onSelectNotification);
  }
  static Future onSelectNotification(String payload) async {
    if (payload != null) {
      print('notification payload: ' + payload);
    }

  }
  static Future onDidReceiveLocalNotification(int id, String title, String body, String payload) {
    print(title+" "+body);
  }

}

显示通知方法

static void showNotification(data, data2) async {
      var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
          'dexterous.com.flutter.local_notifications', 'your channel name', 'your channel description',
          importance: Importance.Max,
          priority: Priority.High);
      var iOSPlatformChannelSpecifics =
      new IOSNotificationDetails();
      var platformChannelSpecifics = new NotificationDetails(
          androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);

      await NotificationHandler.flutterLocalNotificationsPlugin
      .show(
        0,
        data,
        data2,
        platformChannelSpecifics,
        payload: 'Custom_Sound',
      );

  }

Answer 1

我在使用result时也遇到了同样的问题。在混合应用程序的本机部分中未实现。当我将此方法替换为result时，所有问题都解决了。成功（0）

Answer 2

静态编程语言pplication.kt

package your.package.name

import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin
import io.flutter.view.FlutterMain
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService
import com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin

class Application : FlutterApplication(), PluginRegistrantCallback {

    override fun onCreate() {
        super.onCreate()
        FlutterFirebaseMessagingService.setPluginRegistrant(this);
        FlutterMain.startInitialization(this)
    }

    override fun registerWith(registry: PluginRegistry?) {
        if (!registry!!.hasPlugin("io.flutter.plugins.firebasemessaging")) {
            FirebaseMessagingPlugin.registerWith(registry!!.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
        }
        if (!registry!!.hasPlugin("com.dexterous.flutterlocalnotifications")) {
                FlutterLocalNotificationsPlugin.registerWith(registry!!.registrarFor("com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin"));
        }
    }
}

Answer 3

我已经找到了解决方案，这就是为什么在平台端我们不注册外部插件

添加FCMPluginRegistrant。爪哇式

public final  class FirebaseCloudMessagingPluginRegistrant {

    public static void registerWith(PluginRegistry registry) {

        if (alreadyRegisteredWith(registry)) {
            return;
        }
        FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
        FlutterLocalNotificationsPlugin.registerWith(registry.registrarFor("com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin"));


    }




    private static boolean alreadyRegisteredWith(PluginRegistry registry) {
        final String key = FirebaseCloudMessagingPluginRegistrant.class.getCanonicalName();
        if (registry.hasPlugin(key)) {
            return true;
        }
        registry.registrarFor(key);
        return false;
    }
}

并在应用程序中调用它。JAVA

  @Override
    public void registerWith(PluginRegistry registry) {



        FirebaseCloudMessagingPluginRegistrant.registerWith(registry);

    }