Online User Authentication Mobile App Android Project 

Code and documentation of Online User Authentication Mobile App Android Project 

Project Domain / Category

Mobile App.

Abstract / Introduction

Online User Authentication Mobile App., is a user authentication android-based app, that verifies user by sending One Time Password (OTP) to a user’s mobile number by using Firebase authentication. One time password (OTP) code is used to sign in your application by sending an SMS to user’s device by using Firebase Authentication. When a user receives OTP code, it enters in your app., for login. If code is matched correctly, it successfully login and access the app., otherwise it generates the message” invalidate code”.

Functional Requirements:

  1. Create the user registration profile: user need to first register himself into this system by filing up the basic registration details. Like user name, email id, mobile number.
  2. After completion of registration, OTP code will be sent on his/her registered mobile number via SMS.
  3. After that user enter the OTP code in login page, if the user passes the authentication, then system will redirect to the main page.
  4. The OTP code is randomly generated by the system at the time of login.
  5. To create an app and add user interface elements such as Buttons, edit texts, and Text views use android IDE.
  6. Add your project to Firebase console and enable phone authentication.
  7. Implement click listeners on buttons to sign in (Generate OTP) and sign out.
  8. Call Firebase authentication methods on the button on click events.
  9. Retrieve user mobile number from firebase user data.

Learning Requirements:

  • Basic knowledge of JAVA and Android.


  • The latest version of Android Studio installed on your PC or Laptop.
  • A smartphone, as OTP cannot be sent to an emulator.
  • A Gmail ID to enable Firebase and add your project to Firebase console.

lass diagram, activity diagram, data flow diagram, sequence diagram, use case diagram, Use case description, scope, hard requirements, non-functional requirements, testing test cases, SRS document, design manual, and other diagrams are needed to draw for this project.