how to recognizing the device from browser and retrieve unique id

I want to know if it's possible to do the following using an android device.

The user is on his android device browsing a site using the native browser. 开发者_运维问答When the user clicks on an particular link or image; is it possible to get a unique ID from the phone? or write a file to the sd card on the phone? or any means of identifying the device later.

Later when I run a particular application I want to be able to access the information which was stored when the user browsing the website.

I know cookies are out because they allow me to access the information from another application.

help?

You can only get user agent (pointing on android device), but no unique ID of the phone. And wouldn't other apps also have access to a file on the sd cart, or have the same phone id?

I'm not really getting your scenario, but as a hack, you can introduce an encryption in this whole thing. Consider the following scenario:

User clicks on the link in your webpage and some unique generated id is stored in the cookies (for example my_unique_id12). Your webpage and you app have both 1 shared decryption key. When you open your app, it takes your cookie, encrypts it with your key (getting some rubbish like shf4r734r7rr374rh%) and sends it to the website, that decrypts the info, gets the unique id (my_unique_id12) and does whatever you want it to do. Other apps will have access to your cookie, but without secret key they won't be able to get any info.