faust2android is a tool that turns a FAUST program into an Android application. Signal processing tasks as well as accessing the audio record and playback resources are done natively in C++ using the Android Native Development Toolkit (NDK). User interface and other components of the application are programmed in JAVA. The implementation as well as issues related to real-time signal processing on Android platforms are discussed. faust2android is part of a larger project whose goal is to build a full FAUST environment for Android: FAUST D ROID.