The Design And Implementation Of Android System Based Instant Messaging System

With the continuous development of technology, the way people communicate with each other are increasingly diverse, the trend of the times, a number of means of communication will continue to have occurred will be eliminated. However, today’s hottest contemporary instant messaging system is still the most popular means of communication, the emergence of the system greatly improves the quality of people’s mutual exchanges between the people under its function is also maturing transformation and innovation to meet the people mutual exchange between the man and the universal needs. However, there is one big problem is that in the long process of development, there have been many different network protocols, so the lack of uniform standards in the process of communication, communication between each other so that gave cause great difficulties, XMPP agreement effectively solve these problems, so the application development based on XMPP protocol on mobile phones and other mobile devices is very inevitableFirstly, the system gives the background to the development of instant messaging systems do concise analysis and research done by the text of the meaning and purpose were introduced, and finally presented the latest research status related systems. Then communicate with the user to complete in the second chapter of the introduction of the system requirements analysis, the system is divided into different functions according to the following modules:user registration, user login, access friends list, add friends, delete friends, information exchange, the system exits and back-office services, given the system overall West first use case diagram and sequence diagram shows the final interface modules for various detailed text description. After the completion of the needs analysis, the outline design of the system, from the physical and logical architecture design architecture design even a different aspect of the system was set up gives the physical architecture, introduced the system on different levels to complete the function. The fourth chapter details the system design, each module is given in the flow chart or class diagram, class diagram from level describes the functions of the system implementation. The fifth chapter is to realize part of the first description of a simple server-side structures, describes the use of the server, and then gives each module code-level implementation, and describes the functions which implement each interface, giving each module functions to achieve xmpp core protocol specific implementation steps. Finally, Chapter VI summarizes the full text, a brief overview of the work done in this paper, and the paper on the future of the system and raised the prospect anyway.