Use Facebook APP Authentication to automatically login to Mobile Website?

Is there anyway to access the native Facebook application (on iOS or Android) to retrieve login authentication on a mobile website that has permissions already?

The cache and data of browser has been emptied.

User hits http://example.com/

example.com checks to see if there is a token in browser to identify the user and see if user is logged into Facebook. this fails

example.com accesses the Facebook app and gets user token?

User is logged 开发者_StackOverflow社区onto the site automatically.

I know this is more then likely impossible however I thought I would check with the experts.

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Note that this is for Android...

You can use the Facebook SDK to do single sign on (SSO) - and in fact this is the default for authorize().

If you call authorize() with SSO / default, the Facebook SDK will detect whether the Facebook App is installed, and attempt to login via the Faceook App. If the Facebook App is present and logged in, then the SDK will retrieve the access token from the Facebook App, will not do a separate browser login, and will use the access token on subsequent Facebook requests.

Does that do what you need?