public static final String BASE_URL= "http://ashwinku.fwd.wf/ssng-project/api";
public static final String REGISTER_OPERATION = "/registerUser";
public static final String LOGIN_OPERATION = "/loginUser";

public User(String firstName, String password) {
    this.firstName=firstName;
    this.password = password;

}

RestAdapter restAdapter = new RestAdapter.Builder()
            .setEndpoint(Constants.BASE_URL)
            .setLogLevel(RestAdapter.LogLevel.FULL)
            .build();

    //Creating object for our interface
    RequestInterface api = restAdapter.create(RequestInterface.class);
    user = new User(firstName,password);
    user.setFirstName(firstName);
    user.setPassword(password);
    //Defining the method insertuser of our interface
    api.loginuser(user, new Callback<User>() {
        @Override
        public void success(User result, Response response) {
            BufferedReader reader = null;
            //An string to store output from the server
            String output = "";
            try {
                //Initializing buffered reader
                reader = new BufferedReader(new InputStreamReader(response.getBody().in()));
                //Reading the output in the string
                output = reader.readLine();



            } catch (IOException e) {
                e.printStackTrace();
            }
            //Displaying the output as a toast
            Toast.makeText(getActivity(), output, Toast.LENGTH_LONG).show();
        }

        @Override
        public void failure(RetrofitError error) {
            Toast.makeText(getActivity(), error.toString(), Toast.LENGTH_LONG).show();

        }
    });
}