未安装应用程序时 PWA 推送通知不起作用

Question

Are push notification supposed to work only if the PWA is installed? If I load the app in android chrome browser, push notifications are not displayed at all (background or having the site opened) even they come thru the wire.

If I install the app, all notifications are displayed properly (background or focused app).

Is this normal a behaviour or something wrong in the implementation?

Answer 1

This is as expected.

The service worker runs on a separate thread than the one used by your application. This is the reason why your web app can still receive and display notifications even if you (or your user) is not currently visiting the web site.

Therefore if the PWA is not installed (meaning the SW is not running on the client side), there is no code waiting for the incoming notifications.

I wrote an article about service workers , if you want to deepen the PWAs topic.

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UPDATE

• There is an article specifically from OneSignal about not receiving Push Notifications on Android, maybe you can find some hints. If you check the OneSignal dashboard, can you see your client registered there?

• [ This point is for other users landing to this question ]
  If your browser does not show web notifications, you can verify on "Can I Use" web site that your browser version supports notifications and push API and eventually update it.