PluginRegistrantCallback 未在 Flutter 中设置

Question

我运行我的应用程序出现此错误，应用程序关闭时后台通知不起作用：

firebase_messaging: ^7.0.3

final FirebaseMessaging firebaseMessaging = FirebaseMessaging();
  

  @override
  void initState() {
    super.initState();
    registerNotification();
  }



  void registerNotification() {
    firebaseMessaging.requestNotificationPermissions();

    firebaseMessaging.configure(onMessage: (Map<String, dynamic> message) {
      print('onMessage: $message');
      return ;
    }, onResume: (Map<String, dynamic> message) {
      print('onResume: $message');
      return Navigator.push(
          context,
          MaterialPageRoute(
              builder: (context) => NotificationsScreen()));
    }, onBackgroundMessage: _firebaseMessagingBackgroundHandler,
        onLaunch: (Map<String, dynamic> message) {
      print('onLaunch: $message');
      return;
    });

    firebaseMessaging.getToken().then((token) {
      print('token: $token');
      FirebaseFirestore.instance
          .collection('Consultant')
          .doc(firebaseUser.uid)
          .update({'deviceToken': token});
    }).catchError((err) {
      //Fluttertoast.showToast(msg: err.message.toString());
    });
  }

从class出来：

Future<dynamic> _firebaseMessagingBackgroundHandler(
    Map<String, dynamic> message,
    ) async {
  // Initialize the Firebase app
  await Firebase.initializeApp();
  print('onBackgroundMessage received: $message');
}

我得到了：ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: PlatformException(error, PluginRegistrantCallback is not set., null, java.lang.RuntimeException: PluginRegistrantCallback is not set.

我发现的问题是当应用程序关闭时我无法收到通知。在互联网上搜索我看到：PluginRegistrantCallback is not set 是一个涉及 Application.kt class 的错误，但我尝试以任何方式未能成功地放置此文件。大家有什么建议吗？

Answer 1

该错误来自您的应用程序文件。确保正确注册。

Application.java

package <your package name>;

import com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;
public final class CustomPluginRegistrant {
    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 = CustomPluginRegistrant.class.getCanonicalName();
        if (registry.hasPlugin(key)) {
            return true;
        }
        registry.registrarFor(key);
        return false;
    }
}

在同一路径中添加名为 CustomPluginRegistant.java

的文件

package <your package name>;

import com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;
public final class CustomPluginRegistrant {
    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 = CustomPluginRegistrant.class.getCanonicalName();
        if (registry.hasPlugin(key)) {
            return true;
        }
        registry.registrarFor(key);
        return false;
    }
}

如果您没有使用本地通知插件，则可以从代码中删除该部分。

Answer 2

我尝试使用 firebase_messaging: ^7.0.3 来解决 Application.java 问题，结果运行遇到了很多问题。幸运的是，我遇到了关于如何为 flutter 设置 firebase 的更新。如 the official doc 所示，当您使用 Flutter Android Embedding V2（Flutter 版本 >= 1.12） 时，android 不需要额外的步骤.因此，我们首先将以下依赖项添加到 pubsec.yaml:

firebase_core: ^0.7.0
firebase_messaging: ^8.0.0-dev.15

我在中包含了更详细的代码示例答案。

你运行flutter pub get。然后按照中提到的每一步 the doc 然后你就可以开始了。

PluginRegistrantCallback 未在 Flutter 中设置

PluginRegistrantCallback is not set in Flutter

flutter

firebase-cloud-messaging