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With the rapid development of mobile Internet technology and the widespread use of smart phones, more and more attentions have paid on network access and interactive applications through mobile phones. Android becomes the most favorite smart phone by the people and programmers because of its open-source, easy to use and biggest global market share and has broad prospects for development. This article describes the design and implementation of Android mobile operating system based group communication and navigation system. The system provides a friendly group communication platform between friends in order to timely communicate and a real-time positioning, navigation and path planning capabilities with the help of GPS.