颤振：FlutterFcmService - 致命：找不到回调

Question

我想在我的 flutter 应用程序上使用 fcm，所以在创建 firebase 控制台并在我的 gradle 中安装了一些依赖项后，如下所示：

build.gradle：项目

dependencies {
    classpath 'com.android.tools.build:gradle:3.5.0'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath 'com.google.gms:google-services:4.3.3'
}

build.gradle：应用程序

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
apply plugin: 'com.google.gms.google-services'
...
dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.google.firebase:firebase-analytics:17.5.0'
    implementation 'com.google.firebase:firebase-messaging:20.2.4'
}

并创建一个 Java Application 类：

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.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"));
    }
}

并在清单中添加这个应用程序类和意图过滤器：

<application
    android:name=".Application"
    android:label="sian_mobile"
    android:icon="@mipmap/ic_launcher">
    <activity
        android:name=".MainActivity"
    ...
                <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
        <intent-filter>
            <action android:name="FLUTTER_NOTIFICATION_CLICK" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>

并安装firebase_messaging: ^7.0.0在 pubspect

我写了这个简单的 FirebaseMessaging 代码：

  FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  @override
  void initState() {
    super.initState();

    _firebaseMessaging.configure(
      onMessage: (message) async {
        print("-------> $message");
      },
      onResume: (message) async {
        print("-------> $message");
      },
      onLaunch: (message) async {},
    );
  }

当我运行应用程序并且应用程序在前台时，我将通知从控制台推送到应用程序。在 vscode 控制台中，我收到了以下错误：

Installing build/app/outputs/flutter-apk/app.apk...
E/FlutterFcmService(11005): Fatal: failed to find callback
Connecting to VM Service at ws://127.0.0.1:41113/PSCQfaDH4oA=/ws
D/EGL_emulation(11005): eglMakeCurrent: 0xe83ba420: ver 2 0 (tinfo 0xc80dd6e0)
W/.sian_mobil(11005): Accessing hidden method Landroid/os/WorkSource;->add(I)Z (greylist, reflection, allowed)
W/.sian_mobil(11005): Accessing hidden method Landroid/os/WorkSource;->add(ILjava/lang/String;)Z (greylist, reflection, allowed)
W/.sian_mobil(11005): Accessing hidden method Landroid/os/WorkSource;->size()I (greylist, reflection, allowed)
W/.sian_mobil(11005): Accessing hidden method Landroid/os/WorkSource;->get(I)I (greylist, reflection, allowed)
W/.ian_mobil(11005): Accessing hidden method Landroid/os/WorkSource;->getName(I)Ljava/lang/String; (greylist, reflection, allowed)
I/flutter (11005): -------> {notification: {title: test title, body: Test notification text}, data: {}}

Answer 1

看起来当应用程序处于前台时仍然收到推送消息。该问题可能是由于应用程序在后台时没有推送消息的处理程序造成的。我建议阅读本指南来设置后台消息处理程序。