In order to keep the network service uninterrupted, it is necessary for the mobile device to switch to different base stations of Long-term Evolution (LTE) systems or Internet Wi-Fi APs as the mobile device moves. Therefore, in this paper we developed and implemented the App through Android Studio, to separately measure the Received Signal Strength Indication (RSSI) of Wi-Fi and LTE communication networks. After the RSSI measurements and comparing procedures between Wi-Fi and LTE, when the Wi-Fi signal is below the quality threshold, it automatically switches to the LTE networks by the proposed adaptive switching scheme. Then the improvement in the network connections quality can be obtained.