Ionic 3 App launcher icon notifications not working - ionic-framework

I.m used Ionic 3 and I’m trying to change app launcher icon in a my university project currently I’m working on. I’m following the below link from the ionic docs. But the badge is not showing. anyone know how to do it correctly
cordova.plugins.notification.badge.set(10);

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IONIC CAPACITOR APP IonApp classname is undefined instead of platform

I added ionic and capacitor to react.js app. ion-app classname should be ios or android but it is undefined. Anyone knows that how to solve?
enter image description here
I am getting the same error when i run their template app using ionic start. To overcome the problem, I did this
ionic start your-first-app tabs
This creates a similar template app with tabs. However, Unlike the template app that you get by running ionic start and then selecting my-first-app as the starter template, you dont get the gallery app code

Ionic servce - http://localhost:8100/home

I am a beginner for ionic framework.
May I ask when i type ionic serve, ionic app doesn't show app screen but it showed "Ready to create an app? Start with ionic UI component". I have seen from youtube tutorial it suppose to show up mobile like screen.
Appreciate someone can help to verify my query please. thanks.

How can i design this page in ionic 4

how can I design that page in ionic 4? I'm still new to ionic. its a bank app I am building with ionic 4, below is the image of the page.
You should start here, https://ionicframework.com/ read through documentation.
Your app looks like a tabs based app so it would be easiest to start with a tabs ionic project.
Therefore, run ionic start myBankAppName tabs --cordova to use cordova as your native cross-platform engine or ionic start myBankAppName tabs --capacitor to use capacitor for the same purpose.
After that consult the relevant components that you need at https://ionicframework.com/docs/components.
Have fun! ;)

Do I need to start over? - Ionic 4

I have spent about 2 weeks creating an app and have made good progress. However, when I have been looking in to eventually deploying my app I encountered the Ionic Dashboard. Here it gives options to create an app, not to link an existing app. I created my app using the Ionic CLI, and have it connected to GitHub.
Since I’ve not got it synced with my app Dashboard and the only option given is to “Create New App”, do I need to start over?
Thanks in advance.
No you don't have to start over, you have to create a new app in the Ionic Dashboard and then link it to your existing app, following these instructions.
Let me know if you have anymore questions.

Let Ionic2 browser apply windows(wp) theme

I am using Ionic v2(currectly is 2.0.0-beta.25).
After created a Ionic v2 project, and run the
ionic serve
command, Ionic will apply the iOS theme in the browser by default. Since Ionic announced it supported the windows platform, i am planning to use ionic v2 to create an application, so i wish i can preview as windows/wp theme in my browser. The document said that add ?ionicplatform=android to the URL can change how Ionic sees which platform i am on, it works and changed the theme as android. Then i tried ?ionicplatform=wp and also ?ionicplatform=windows . it doesn't work.
I also followed this document to add class="wp" , it still doesn't work. i also found Ionic Lab, this application even don't have a windows phone option.
The offical document have a live perview on the right side of the v2 components document page. so i think maybe there is some way to make the perview in browser to apply the windows/wp theme. I've google it but can't find any answer.
I also tryed edit my UserAgent as Lumia phone but it still doesn't works.
So, if i want the ionic serve browser perview apply windows/wp theme, what should i do?
Thanks
You can do this using chrome. When project are running make inspect and select ctrl+shift+m for change to device mode and choice your phone. If windows phone are not in that list, click edit in dropdown and there you have at least one Windows Phone. :)