This paper designs an Android communication system on the basis of studying the related communication research, and the system utilizes the wifi network and point-to-point architecture and messages between client sides are delivered by means of the Socket. In addition to the instant text information transmission, functions of on-line and off-line as well as file transfer are added. The adoption of the multi-threading technology enhances the program’s utilization of the system resources. Better operating results are obtained in the test on the Android platform.%文章在对相关通信协议研究的的基础上，设计出了一种Android通信系统，该系统利用wifi网络，采用点对点体系结构，客户端之间通过Socket传送消息。除了即时文本信息的传输外，增加了上下线功能和文件传输功能。采用多线程技术，增强了程序对系统资源的利用。在Android平台上测试，取得了较好的运行效果。
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机译：Tecnologie Gsm，WiFi e DECT in ambiente Ospedaliero：Valutazione della Compatibilita elettromagnetica con Dispositivi medici di supporto Vitale。 （医院的Gsm，WiFi和DECT技术：评估与生命支持设备的电磁兼容性）
