I want to ask one question related to Android Development. I create registration and login activity with Sqlite DB. it works perfectly but it does not connect online.
Example:- In the android registration process, I created a username as PrimaryKey. I Register my self in one mobile username is a fighter and when I install that app in another android mobile and want to register an account with username fighter it accepts it or when I directly login with fighter message display that it is not registered. 
muhammadosama
(150 Points)
shakti
(9.5K Points)
Do you know about APIs? How to create APIs for android app development. The developer creates APIs for registration and login purposes. You can create a registration form using an android app with the database but you need to insert data and fetch data from the database using APIs. After that, you can easily log in to any android application.
I have a reference for you -
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