Design And Implementation Of Instant Message Application Based On Wi-Fi Direct Technology

With the rapid development of Internet technologies and smart mobile terminals(e.g.,smart phones),people increasingly rely on mobile communication networks,especially for real-time voice communications and video transmission.But in some cases,users may not be able to connect to the operator's 4G network,such as in the wild or in indoor scenes where signal is shielded.In this case,it is necessary for people to have an application that can achieve the text chat,voice interphone or video transmission in the short distance.Considering the issue above,this thesis analyzes and implements the application of text chat,interphone and real-time video transmission based on Wi-Fi Direct technology,making the users still able to achieve close communication through Wi-Fi Direct technology,in the scene of no network coverage and network instability.Specifically,the work of this thesis lies in the follow aspects:First,based on the analysis of various related technologies and applications: Wi-Fi Direct technology and Wi-Fi Direct Service,the thesis designs and implements the text chat,voice interphone or real-time video transmission framwork based on Wi-Fi Direct in the Android platform,which aims to solve the issues of instant communicating without using the cellular network and static Wi-Fi access point.Secondly,with the application architecture based on Wi-Fi Direct,Through designing and analyzing modules of the various levels in the whole structure,the thesis achieves the service layer's Wi-Fi Direct,the Application Service Platform and the application layer's function of text chat,it also gives the detailed implementation process and results of FIG in the end.Finally,on the basis of the service layer,it develops interphone and real-time video transmission function and also gives the detailed implementation process and prototype screenshots.