使用 Flutter Messaging 推送通知会导致 Flutter 应用程序崩溃

Question

我已经使用 Flutter 一年了，但这是我第一次使用推送通知。我正在尝试在旧项目中添加推送通知。我已经编写了云 Firebase 函数来推送通知。

但是当通知发送到android手机的token时。 Android 应用程序崩溃并显示以下错误消息。

2021-01-13 00:49:37.011 6127-6127/com.app.oldProject E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.app.oldProject, PID: 6127
java.lang.RuntimeException: Unable to instantiate receiver com.google.firebase.iid.FirebaseInstanceIdReceiver: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.iid.FirebaseInstanceIdReceiver" on path: DexPathList[[zip file "/data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/base.apk"],nativeLibraryDirectories=[/data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/lib/arm64, /data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/base.apk!/lib/arm64-v8a, /system/lib64]]
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:3633)
    at android.app.ActivityThread.access$1400(ActivityThread.java:237)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1889)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:224)
    at android.app.ActivityThread.main(ActivityThread.java:7081)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:928)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.iid.FirebaseInstanceIdReceiver" on path: DexPathList[[zip file "/data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/base.apk"],nativeLibraryDirectories=[/data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/lib/arm64, /data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/base.apk!/lib/arm64-v8a, /system/lib64]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at android.app.AppComponentFactory.instantiateReceiver(AppComponentFactory.java:84)
    at androidx.core.app.CoreComponentFactory.instantiateReceiver(CoreComponentFactory.java:60)
    at android.app.ActivityThread.handleReceiver(ActivityThread.java:3626)
    at android.app.ActivityThread.access$1400(ActivityThread.java:237) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1889) 
    at android.os.Handler.dispatchMessage(Handler.java:106) 
    at android.os.Looper.loop(Looper.java:224) 
    at android.app.ActivityThread.main(ActivityThread.java:7081) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:928) 
    Suppressed: java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/legacy/content/WakefulBroadcastReceiver;
    at java.lang.VMClassLoader.findLoadedClass(Native Method)
    at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
            ... 12 more
 Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.legacy.content.WakefulBroadcastReceiver" on path: DexPathList[[zip file "/data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/base.apk"],nativeLibraryDirectories=[/data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/lib/arm64, /data/app/com.app.oldProject-wnxma3Smq-VCUX1eO04_kg==/base.apk!/lib/arm64-v8a, /system/lib64]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
            ... 15 more

我正在为我的项目共享下面的 pubspec.yaml 和 gradle，以便您可以查看依赖项。

pubspec.yaml：

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  cloud_firestore: ^0.9.7+2
  firebase_storage: ^2.1.0+1
  firebase_core: ^0.3.0
  image_cropper: ^1.2.3
  firebase_auth: ^0.8.3
  image: ^2.0.7
  cupertino_icons: ^1.0.0
  path_provider: ^1.6.21
  firebase_messaging: ^4.0.0+1

这些是 app\build.gradle 中的依赖

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:multidex:1.0.3'
    implementation 'com.google.firebase:firebase-core:16.0.1'
}

我的颤振代码是

 configurePushNotifications() {
    _firebaseMessaging.getToken().then((token) {
      print("Firebase Messaging Token: $token\n");
      usersRef.document(currentUser.id).updateData({"token": token});
    });

    _firebaseMessaging.configure(
      onLaunch: (Map<String, dynamic> message) async {
        print("here in the on Launch");
      },
      onResume: (Map<String, dynamic> message) async {
        print("here in the on Resume ");
      },
      onMessage: (Map<String, dynamic> message) async {
        print("on message: $message\n");
      },
    );
  }