How to build an user authentication and login system using only a file but not database?

Question

I'm new in android studio and just learnt basic java. I want to build an user authentication system in android studio using only file,not database but don't know how to do that. Please help me to do that.

Answer 1

Make your layout and all the required views. Provide validations to the required views to check if the entered values are correct or not.

For login check this linkhttps://www.tutorialspoint.com/android/android_login_screen.htm

Answer 2

Providing Hypothetical Design.

Login class

public class Login {

    private String mUsername;
    private String mPassword;

    Login(String username,String password){
        mUsername = username;
        mPassword = password;
    }

    public String getmPassword() {
        return mPassword;
    }

    public String getmUsername() {
        return mUsername;
    }

    public void setmPassword(String mPassword) {
        this.mPassword = mPassword;
    }

    public void setmUsername(String mUsername) {
        this.mUsername = mUsername;
    }


}

Create UI for username and password in xml. Create Login object.You can learn from officialhttps://www.udacity.com/course/android-basics-user-input--ud836 course

To cache in file. Use File api and read write in file while validating login.

Note: But this is very very basic thing and this is not recommendable for authantication module as this is not secure thing.

You must use database and ContenProvider for login module.

Thanks

Happy Coding.