In this paper, we present a lightweight library to develop Bluetooth related applications in Android environment for wireless sensor network. Bluetooth based communication can be applied by some basic steps including enquiry, authorization and connect. Currently, Google provides a Bluetooth handling API as an Android SDK and a tutorial, however the development with this APIs may be still difficult for beginners. Considering these, for easy-to-use APIs in Android Platform, we design a standard library which is called "MoscaBluetooth", to help developers develop Bluetooth application easily.