Flutter - 无法将 MethodChannel 与 Firebase onBackgroundMessage 一起使用

Posted 2023-02-23

【中文标题】Flutter - 无法将 MethodChannel 与 Firebase onBackgroundMessage 一起使用

【英文标题】：Flutter - Failed to use MethodChannel with Firebase onBackgroundMessage

【发布时间】：2020-06-16 06:11:18

【问题描述】：

在应用程序关闭时尝试打开 android 活动时失败。在下面的代码中看到，当我收到来自 firebase 的数据通知时，当应用程序在后台时，我应该使用 MethodChannel 打开一个活动来访问 java，但我收到此错误：

在通道 com.example.service/start 上找不到方法 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">

MainActivity.java

package com.example.mobile;

import androidx.annotation.NonNull;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugins.GeneratedPluginRegistrant;

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;

public class MainActivity extends FlutterActivity 
    private static final String CHANNEL = "com.example.service/start";

    @Override
    public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) 
        GeneratedPluginRegistrant.registerWith(flutterEngine);

        new MethodChannel(flutterEngine.getDartExecutor(), CHANNEL)
                .setMethodCallHandler(
                        (call, result) -> 
                            if(call.method.equals("openActivity"))
                                openActivity();
                                result.success("open activity");
                            
                        
                );
    

    void openActivity()
       Intent i = new Intent(this, SecondActivity.class);
       startActivity(i);
    

main.dart

_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");
  

我哪里出错了，我怎样才能让它发挥作用？

【问题讨论】：

你解决了这个问题吗？我也有同样的问题。谢谢

【参考方案1】：

在您的 AndroidManifest.xml 文件中，android:name 必须是 android:name=".Application"，并确保 MainActivity.java 和 Application.java 在同一个文件夹中