Check for system updates on Android devices

I'm looking for any way to check for Android OS updates from within custom Android app.

The app 开发者_如何学JAVAshould be able to get info if new version is available and, if so, show appropriate message. This should work on phones provided by many manufacturers. Is there any API method or a web service which can be queried about this?

I know this feature is carrier-depended and that's way I'm not sure if it's even possible.

Thanks in advance.

There is no way to do this. Your app is sandboxed and can't access that kind of information and there is no API from the carrier's end.