title: How can i login in a webservice using my android app?
body: <p>I am making an app that opens with a login page.I am trying to login in a webservice. We need to enter the user id and password. After entering the correct values the app should move to a next activity where json data from the server will be displayed.
  I am using Retrofit for this but i am not able to connect my app with the login page. How do i do that?</p>