Java 颤振-无法将MethodChannel与Firebase onBackgroundMessage一起使用

我在应用程序关闭时尝试打开android活动时失败。在下面的代码中可以看到，当我从firebase收到数据通知时，当应用程序处于后台时，我应该使用MethodChannel打开一个活动来访问java，但我得到了以下错误：

在channel com.example.service/start上未找到方法openActivity的实现

Application.java

package com.example.mobile;

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.plugins.firebasemessaging.FlutterFirebaseMessagingService;

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

    @Override
    public void registerWith(PluginRegistry registry) {
        FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
    }
}

AndroidManifest.xml

<application
        android:name="com.example.mobile.Application"
        android:label="mobile"
        android:icon="@mipmap/ic_launcher">

主飞镖

_firebaseMessaging.configure(
      onMessage: (message) async {
        //
      },
      onLaunch: (message) {
        //
      },
      onResume: (message) {
        //
      },
      onBackgroundMessage: myBackgroundMessageHandler,
    );

Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) async {
  MethodChannel channel = new MethodChannel("com.example.service/start");

  if (message.containsKey('data')) {
    final dynamic data = message['data'];

    var open = await channel.invokeMethod("openActivity");
  }
}

\u firebaseMessaging.configure(
onMessage：（消息）异步{
//
},
onLaunch：（消息）{
//
},
onResume：（消息）{
//
},
onBackgroundMessage:myBackgroundMessageHandler，
);
未来myBackgroundMessageHandler（映射消息）异步{
MethodChannel=newMethodChannel（“com.example.service/start”）；
if（message.containsKey（'data'））{
最终动态数据=消息['data']；
var open=wait channel.invokeMethod（“openActivity”）；
}
}

---

我哪里出了问题，如何才能使其正常工作？

在您的AndroidManifest.xml文件中，android:name必须是android:name=“.Application”，并确保MainActivity.java和Application.java位于同一文件夹中

您解决了这个问题吗？我也有同样的问题。谢谢

_firebaseMessaging.configure(
      onMessage: (message) async {
        //
      },
      onLaunch: (message) {
        //
      },
      onResume: (message) {
        //
      },
      onBackgroundMessage: myBackgroundMessageHandler,
    );

Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) async {
  MethodChannel channel = new MethodChannel("com.example.service/start");

  if (message.containsKey('data')) {
    final dynamic data = message['data'];

    var open = await channel.invokeMethod("openActivity");
  }
}