This paper presents SAMi, a self-adaptive Information sharing Middleware for a dynamic pervasive computing environment such as a Mobile Ad-hoc NETworks (MANET). SAMi can be used by co-located devices to share information regardless of their mobility pattern and density. A preliminary prototype has been developed to simulate MANETs and to implement the middleware. According to the experiment that has been performed to evaluate major features of the middleware, we found SAMi a promising middleware to share information in MANETs.