Zaidi, Sofiane2026-06-092026-06-092026http://dspace.univ-oeb.dz:4000/handle/123456789/22693With the rapid evolution of mobile technologies, smartphones and portable devices have become an integral part of everyday life. At the core of these devices lies the mobile operating system, which plays a fundamental role in ensuring their functionality, usability, and performance. A mobile operating system not only manages hardware resources and wireless communication but also provides a platform for running applications and delivering services to users. Over the years, mobile operating systems have evolved significantly, transitioning from early systems designed for Personal Digital Assistants (PDAs) to sophisticated platforms capable of supporting complex applications while efficiently managing limited resources such as battery life and processing power. This evolution has led to the emergence of a wide range of operating systems, which can be broadly classified into proprietary and open-source systems, each with its own advantages and ecosystem. Today, the mobile operating system market is largely dominated by a few key players, shaping the direction of mobile computing and application development. Understanding these systems is essential for grasping how modern mobile applications are designed, deployed, and optimized.enMobile application ; Android platform ; Activities and resources ; Graphic Interfaces and Widgets; Menus and Dialog boxes; AndroidManifest.xml file; Communication between components ; Data base with SQLIte ; Development of simple applicationOther