I am new in sharepoint. I want to create a user login in android application but i have to use a sharepoint 2013 web service to check the user login authentication.
and also want to know how can i get sharepoint 2013 web service URL?
For Authentication you can use
Authentication.Login method. This accepts a username and password
Detailed web service references is available in https://msdn.microsoft.com/en-us/library/office/jj193051.aspx
The webservice URL remains constant and only the web application URL changes.
http://weburl/_vti_bin/authentication.asmx here you can switch
weburl to the SharePoint server you are trying to authenticate.
You can do remote authentication, tutorial available in http://paulryan.com.au/2014/spo-remote-authentication-rest/