Develop Reference

Ionic 5 Capacitor hardware back button ending the app

I have a problem testing my ionic app on my phone and android studio, when i press the hardware back button the application inmediatly exits, i've tried many solutions, but it simply won't work and won't listen to whatever i code into it.
Here is my attempt
import { Component, Renderer2, ViewChild } from '#angular/core';
import { IonRouterOutlet, Platform } from '#ionic/angular';
import { SplashScreen } from '#ionic-native/splash-screen/ngx';
import { StatusBar } from '#ionic-native/status-bar/ngx';
import { TranslateService } from '#ngx-translate/core';
import { Location } from '#angular/common';
#Component({
selector: 'app-root',
templateUrl: 'app.component.html',
styleUrls: ['app.component.scss']
})
export class AppComponent {
#ViewChild(IonRouterOutlet, {static: true}) routerOutlet: IonRouterOutlet
constructor(
private platform: Platform,
private splashScreen: SplashScreen,
private statusBar: StatusBar,
private renderer: Renderer2,
private translate: TranslateService,
private location: Location
) {
this.initializeApp();
}
initializeApp() {
this.translate.setDefaultLang( localStorage.getItem('default-language') ? localStorage.getItem('default-language') : navigator.language.slice(0, 2) )
this.platform.ready().then(() => {
this.statusBar.styleDefault();
this.splashScreen.hide();
this.backButtonEvent();
if (localStorage.getItem('color-theme')) {
this.renderer.setAttribute(document.body, 'color-theme', localStorage.getItem('color-theme'))
} else {
if(window.matchMedia && window.matchMedia('(prefers-color-scheme: light)').matches === true)
this.renderer.setAttribute(document.body, 'color-theme', 'light')
else
this.renderer.setAttribute(document.body, 'color-theme', 'dark')
}
});
}
backButtonEvent() {
this.platform.backButton.subscribeWithPriority(0, async () => {
if(!this.routerOutlet.canGoBack())
navigator["app"].exitApp()
else
this.location.back()
});
}
}

Try it this way using the #capacitor/app package:
import { App } from '#capacitor/app';
App.addListener('backButton', ({ canGoBack }) => {
if(canGoBack){
window.history.back();
} else {
App.exitApp();
}
});

Capacitor - Not receiving push notifications in Ionic + Angular app

I've started moving on capacitor. After reading https://capacitorjs.com/docs/cordova/known-incompatible-plugins I found that capacitor doesn't support some cordova plugins.
I'm using cordova-plugin-fcm-with-dependecy-updated for android and cordova-plugin-fcm for iOS in my app for push notifications but capacitor doesn’t support these plugins so I used capacitor native approach guided in https://capacitorjs.com/docs/apis/push-notifications#addlistener.
The native approach is not throwing any error and I am able to get registered token as well but I am not receiving push notifications on registered device.
I also tried https://www.npmjs.com/package/capacitor-fcm but fcm.getToken() is returning null.
capacitor.config.json
"plugins": {
"PushNotifications": {
"presentationOptions": [
"badge",
"sound",
"alert"
]
}
}
app.ts
#Component({
selector: 'app-root',
templateUrl: 'app.component.html'
})
export class AppComponent implements OnInit {
constructor(
private platform: Platform,
private splashScreen: SplashScreen,
private fcmService: FcmService
) {
this.initializeApp();
}
ngOnInit() {}
initializeApp() {
this.platform.ready().then(() => {
setTimeout(() => {
this.splashScreen.hide();
}, 300);
this.fcmService.initPush();
});
}
}
fcm.service.ts
import { Injectable } from '#angular/core';
import {
Plugins,
PushNotification,
PushNotificationToken,
PushNotificationActionPerformed,
Capacitor
} from '#capacitor/core';
import { Router } from '#angular/router';
const { PushNotifications, Modals } = Plugins;
import { FCM } from '#capacitor-community/fcm';
const fcm = new FCM();
const { FCMPlugin } = Plugins;
#Injectable({
providedIn: 'root'
})
export class FcmService {
constructor(
private router: Router) { }
initPush() {
alert('Capacitor platform' + Capacitor.platform);
if (Capacitor.platform !== 'web') {
this.registerPush();
}
}
private registerPush() {
PushNotifications.requestPermission().then((permission) => {
if (permission.granted) {
// Register with Apple / Google to receive push via APNS/FCM
PushNotifications.register();
} else {
alert('No permission for push granted');
}
});
PushNotifications.addListener(
'registration',
(token: PushNotificationToken) => {
alert('APN token: ' + JSON.stringify(token));
fcm.getToken().then((r) => {
alert(`FCM Token: ${r.token}`); //---- showing null.
}).catch((err) => {
alert(`FCM Token ERROR: ${JSON.stringify(err)}`);
});
}
);
PushNotifications.addListener('registrationError', (error: any) => {
alert('Registration Error: ' + JSON.stringify(error));
});
PushNotifications.addListener(
'pushNotificationReceived',
async (notification: PushNotification) => {
Modals.alert({
title: notification.title,
message: notification.body
})
}
);
PushNotifications.addListener(
'pushNotificationActionPerformed',
async (notification: PushNotificationActionPerformed) => {
alert('Action performed: ' + JSON.stringify(notification.notification));
}
);
}
}
Is there anything I am missing or I need to add extra configurations to receive push notifications ?

You added SHA certificate fingerprints in your firebase project and update google service file ?

How to conditionally set root page in ionic 4?

I'm working on ionic 4 application. when the user signs In, I added a checkbox to asks for Remember me, so the next time the user open the app it doesn't show the login page and directly forward the user to Home page. I have google and found this. However, while using the accepted solution, I encountered an issue, which it shows the login page for 2 or 3 seconds, then open the Home page. How I can safely achieve it without delay?
app.component.ts
import { SmsVerificationService } from 'src/app/services/SMS/sms-verification.service';
import { Component } from '#angular/core';
import { Platform } from '#ionic/angular';
import { SplashScreen } from '#ionic-native/splash-screen/ngx';
import { StatusBar } from '#ionic-native/status-bar/ngx';
import { FCM } from '#ionic-native/fcm/ngx';
import { Plugins, Capacitor } from '#capacitor/core';
import { Router } from '#angular/router';
import { Storage } from '#ionic/storage';
#Component({
selector: 'app-root',
templateUrl: 'app.component.html'
})
export class AppComponent {
constructor(
private platform: Platform,
private splashScreen: SplashScreen,
private statusBar: StatusBar,
private fcm: FCM,
private route: Router,
private storage: Storage
) {
this.initializeApp();
}
initializeApp() {
this.platform.ready().then(() => {
this.fcm.getToken().then(token => {
console.log(' token is ', token);
});
this.fcm.onTokenRefresh().subscribe(token => {
console.log('on token refresh ', token);
});
this.fcm.onNotification().subscribe(data => {
console.log(data);
if (data.wasTapped) {
console.log('Received in background');
// this.router.navigate([data.landing_page, data.price]);
} else {
console.log('Received in foreground');
// this.router.navigate([data.landing_page, data.price]);
}
});
this.storage.get('isLogined').then(data => {
if (data)
this.route.navigateByUrl('/main-tab');
})
this.statusBar.styleDefault();
this.splashScreen.hide();
if (Capacitor.isPluginAvailable('SplashScreen')) {
Plugins.SplashScreen.hide();
}
});
}
}
The codes that are supposed to change the page
this.storage.get('isLogined').then(data => {
if (data)
this.route.navigateByUrl('/main-tab');
})

Do you have a separate login component? If so, you can create and add a guard to your login component to navigate to your main page when Remember me was checked.

ionic2 Streaming Media is not working

I'm using the streaming media plugin in my ionic2 application.
this is my code:
let option:StreamingAudioOptions = {
successCallback: () => { console.log('Audio played') },
errorCallback: (e) => { console.log(JSON.stringify(e,null,2)) }
}
this.streamingMedia.playAudio('http://sounddible.com/grab.php?id=2196&type=mp3',option);
the errorCallback return "Class not found"
Any help for explain the reason of this log
Thanks.

try below code :
import { Component } from '#angular/core';
import { NavController } from 'ionic-angular';
import { StreamingMedia, StreamingAudioOptions } from '#ionic-native/streaming-media';
#Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
constructor(public navCtrl: NavController,private streamingMedia: StreamingMedia) {}
startAudio(){
let options: StreamingAudioOptions = {
successCallback: () => { console.log('Video played') },
errorCallback: (e) => { console.log(JSON.stringify(e,null,2)) },
initFullscreen:false,
};
this.streamingMedia.playAudio('YOUR_URL', options);
}

Open a file within the app folder with fileOpener Ionic2

this is my code :
import { Component } from '#angular/core';
import { NavController } from 'ionic-angular';
import { FileOpener } from 'ionic-native';
#Component({
selector: 'page-installHelper',
templateUrl: 'installHelper.html'
})
export class InstallHelper {
constructor(public navCtrl: NavController) {
FileOpener.open('assets/app.apk', 'application/vnd.android.package-archive').then(
function(){
console.log("success");
}, function(err){
console.log("status : "+err.status);
console.log("error : "+err.message);
});
}
}
but I can't access the file app.apk which is in assets/app.apk
and I get the error :
Status : 9
Error : File Not Found
is it even possible to access a file within the app folders ?

Well I did it by making the app get downloaded from a server to a local folder I created in the phone and install it immediately/automatically,
Here is the code in case someone else needed it one day :
import { Component } from '#angular/core';
import { Platform, LoadingController } from 'ionic-angular';
import { StatusBar, Splashscreen } from 'ionic-native';
import { FileOpener } from 'ionic-native';
import { File } from 'ionic-native';
import { Transfer } from 'ionic-native';
import { HomePage } from '../pages/home/home';
declare var cordova: any;
#Component({
template: `<ion-nav [root]="rootPage"></ion-nav>`
})
export class MyApp {
rootPage = HomePage;
constructor(platform: Platform, public loadingCtrl: LoadingController) {
let me = this;
platform.ready().then(() => {
let loading = me.loadingCtrl.create({
content: 'Preparing The App ...'
});
loading.present();
File.createDir(cordova.file.externalDataDirectory, "appFolder", true).then(function(link){
const fileTransfer = new Transfer();
let url = 'http://yourserverhere.com/app.apk';
fileTransfer.download(url, cordova.file.externalDataDirectory +"appFolder/app.apk").then((entry) => {
loading.dismiss();
FileOpener.open(entry.toURL(), "application/vnd.android.package-archive").then(
function(){
console.log("success");
},function(err){
console.log("status : "+err.status);
console.log("error : "+err.message);
});
}, (error) => {
console.log(error);
});
},function(error){
console.log(error);
});
StatusBar.styleDefault();
Splashscreen.hide();
});
}
}
Any explanation just ask me.

Well since you want the user to download the .apk file, you could use (in your html)
<a href="assets/app.apk" download>Download apk</a>
But the user will have to manually open his downloads (or tap the popup) to install your app.
I do not know if there is a plugin which is capable of installing these apk files. (Googling for ionic 2 install external apk didn't return any results).