Wireless communication provides convenience service for mobile devices. Considering different wireless characteristics, e.g., WIFI and 3G/4G, a mobile device user may manually change its wireless connection. For intelligent devices, users hope to keep the cooperative networking to work in background automatically. The paper introduces a new method of triggering cooperative networking among portable devices, which is named Active Cooperative Networking Recognition Method (ACNRM). Considering the increasing sensing ability of current smart devices, the method exploits accelerometers in smart devices to recognize some featured activities of the device users, and then trigger different networking operations. The method assists mobile devices to be aware of the changes in their environments without sending periodical message beacons. Thus it can be used for temporary networking among smart devices on vehicles and can save the networking cost.