带有IONIC 4的FCM不显示图像

Question

我正在尝试使用FCM和IONIC 4推送通知，并且“通知”工作得很好，但通知图像没有显示

这是发送通知的对象

    {
  "notification":{
    "title":"Ionic 4 Notification",
    "body":"This notification sent from POSTMAN using Firebase HTTP protocol",
    "sound":"default",
    "click_action":"FCM_PLUGIN_ACTIVITY",
    "icon":"fcm_push_icon",
    "main_picture":"https://qahwaziada.com/images/1566224625.jpg",
    "image":"https://qahwaziada.com/images/1566224625.jpg",
    "picture":"https://qahwaziada.com/images/1566224625.jpg"
  },
  "data":{

    "page":"test"
  },
    "to": "/topics/all",
    "priority":"high",
    "restricted_package_name":""
}

，我尝试从Firebase控制台从云消息发送，但结果相同

这是代码形式app.component.ts

   /**
   * initialization of FCM
   */
  FirebaseCloudMessagingInit(){
    //token and get it
    this.fcm.getToken().then(token => { console.log(token); });
    this.fcm.onTokenRefresh().subscribe(token => {  console.log(token); });

    //listen to any notification
    this.fcm.onNotification().subscribe(data => {
      console.log(data,'data');
    });

  }