Failed to launch ‘URL’ because the scheme does not have a registered handler Code Answer

let app;

if (this.platform.is('ios')) {
  app = 'twitter://';
} else if (this.platform.is('android')) {
  app = 'com.twitter.android';
}

this.appAvailability.check(app)
  .then(
    (yes: boolean) => console.log(app + ' is available'),
    (no: boolean) => console.log(app + ' is NOT available')
  );

Inside browser:

1. Use timeout fallback i.e.

   <!-- Deep link URL for existing users with app already installed on their device -->
   window.location = 'yourapp://app.com/?screen=xxxxx';
   
   <!-- Download URL (TUNE link) for new users to download the app -->
   setTimeout("window.location = 'http://hastrk.com/serve?action=click&publisher_id=1&site_id=2';", 1000);
   

   <a href           ="..."  Fallback  (and unsupported OSs)
      data-app       ="..."  Deep link (cross-OS)
      data-app-[os]  ="..."  Deep link (OS-specific)
      data-store-[os]="..."> Store ID  (OS-specific)
   

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