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当前智能手机之间文件传输方案可分为依托互联网和自组网2类，基于互联网的方案大多采用P2P直传或者通过服务器转发传输，无法访问互联网的情况下大多采用WiFi热点技术或蓝牙技术建立自组网进行文件传输。但在网络环境动态变化的情况下，这2种传输方式间的切换会导致文件重传，浪费已传输的资源。针对此问题，本文提出一种在网络环境动态变化的情况下文件传输的方案，解决在不同网络环境下文件传输路径的优化选取以及跨网络的文件续传问题，并提高文件传输速度。
Currently, there are two types of file transfer schemes between smartphones: Internet-based and ad-hoc networks. Most Internet-based solutions use P2P direct transmission or server forwarding to transmit. In the case of inaccessible Internet, WiFi hotspot technology or Bluetooth technology is mostly used Self-network for file transfer. However, when the network environment changes dynamically, switching between the two transmission modes results in file retransmission and wastes the transmitted resources. In response to this problem, this paper presents a file transfer scheme under dynamic network environment changes to solve the optimal selection of file transfer paths and file transfer across networks in different network environments, and to improve the file transfer speed.