校园旧书交易安卓软件开发与设计研究：基于Android平台的便捷交易系统优化。

The development of campus second-hand book trading software has gained increasing attention due to the growing influence of the Internet. Through online trading platforms, people can purchase the old books they need without leaving their homes, saving time and effort. As an important part of second-hand book trading, there is a large market for old book transactions. Therefore, it is necessary to develop an online campus second-hand book trading software platform. With the popularity of smartphones, especially the development of the Android operating system, activities conducted online via smartphones, such as chatting and shopping, are becoming more common. Utilizing the smartphone platform, there is a broad market for commodity trading, hence the development of a campus second-hand book trading software system based on the Android platform is essential. The development involves the establishment and maintenance of the backend database, the development and maintenance of the backend server, and the development of the mobile application. For the former, it is essential to establish a database with strong data consistency, integrity, and good security, while for the latter, the application should have complete functionality and ease of use. This system will enable students to easily publish old books, quickly search for old book information, and facilitate smoother transactions. Keywords: Android; database; old books.