DEVELOPMENT OF AN ANDROID-BASED BICYCLE AND SPARE PARTS SALES APPLICATION AT THE ADAN ADEN BICYCLE SHOP

In today's digital era, the existence of Android-based mobile applications has become an integral part of daily life, especially in the context of business and marketing. This research focuses on the development of a spare parts and bicycle sales application implemented at the Adan Aden Bicycle Shop in Cianjur, West Java. The main purpose of this application is to facilitate the online sales and promotion process, expand market reach, and improve the efficiency and effectiveness of business transactions. The application developed consists of two main parts: the My ADD Bike application for customers and the ADD Bike application for store admins or employees. These two apps are connected through Google Firebase's data storage admin server. The methodology used in the development of this application is Extreme Programming, with Kotlin and XML as the programming languages. Application testing is conducted using the blackbox method to ensure all system functionality is running properly.The results of this study show that Android-based sales applications can be an effective solution to improve business performance in the retail sector, especially in bicycle and spare parts sales. With this application, Adan Aden Bicycle Shop can promote and sell not only directly through physical stores and social media, but also through a wider digital platform.