Restful User Authentication

I want to develop a restful web service for my android application. I have some questions and problems. I want to use a database for the user login and signup for the beginning. But how can i make a restful webservice (in java) where i can authenticate a user. The user has to login with a username and password and this username and password has to be checked. How can i make this? I have read a lot but i don't find a solution. I want to use this webservice in my android application (using http and xml/json)

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I am a very new to android application development and need to solve this problem. In my activity window, i would like to provide a button which makes a restful api call. That call returns an xml response. My server will wait until it gets back that response. Once it get backs response. It opens another activity window and parses the xml results and display them accordingly. How is this possible ? . To break down my questions again

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