我是ionic 3的新手，我已经在正在构建的应用程序上实现了fcm推送通知，并且当该应用程序运行时（在前台和后端），它都可以正常工作，但是当我尝试将推送通知发送给用户，当应用未运行时，我没有收到任何消息，因此有人可以为我提供一些有关此问题的帮助。
预先感谢。
页
import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams, ActionSheetController,Platform,AlertController } from 'ionic-angular';
import { AddeventPage } from '../addevent/addevent';
import { EventItem } from '../../models/event-item/event-item.interface';
import {AngularFireDatabase, AngularFireList} from 'angularfire2/database';
import {AuthService} from '../../services/auth'
import { Observable } from 'rxjs';
import { SigninPage } from '../signin/signin';
import {EventdetailsPage} from '../eventdetails/eventdetails';
import { FCM } from '@ionic-native/fcm';
import firebase from "firebase";
import { Push, PushObject, PushOptions } from '@ionic-native/push';
/**
* Generated class for the EventlistPage page.
*
* See https://ionicframework.com/docs/components/#navigation for more info on
* Ionic pages and navigation.
*/
@IonicPage()
@Component({
selector: 'page-eventlist',
templateUrl: 'eventlist.html',
})
export class EventlistPage {
username: String;
eventListRef$ : Observable<any[]>
constructor(
private authService:AuthService,
private database: AngularFireDatabase,
public navCtrl: NavController,
private actionSheetCtrl: ActionSheetController,
public navParams: NavParams,
public platform: Platform,
private fcm: FCM,
private push: Push,
public alertCtrl: AlertController
) {
this.eventListRef$ = this.database.list('eventlist').valueChanges();
this.initFCM();
}
onSelectEvent(){
this.actionSheetCtrl.create()
}
goToAddEvent() {
this.navCtrl.push(AddeventPage);
}
cardtapped(event){
this.navCtrl.push(EventdetailsPage, {
date:event.date,
time:event.time,
});
}
initFCM() {
this.fcm.subscribeToTopic('marketing');
// if(typeof(this.fcm) !== "undefined"){
this.fcm.getToken().then(token=>{
alert(token);
console.log(token);
firebase.database().ref('/volunteers/'+this.authService.getActiveUser().uid).update({
fcmtoken:token
})
});
//this.fcm.subscribeToTopic('/topics/all');
this.fcm.onNotification().subscribe(data=>{
if(data.wasTapped){
alert("Received in background")
var Str1 = JSON.stringify(data.value)
alert(Str1)
} else {
var Str2 = JSON.stringify(data.value)
alert("Received in foreground"+Str2);
};
});
this.fcm.onTokenRefresh().subscribe(token=>{
alert(token);
});
this.fcm.unsubscribeFromTopic('marketing');
}
}