The Android mobile operating system has been gaining popularity and learning how to write Android applications can make you a more marketable programmer. Android is an open-source operating system owned by Google and runs on mobile phones as well as tablet computers. Android applications are written using the Java programming language. One of the best development tools that can get you started is Eclipse. Develop your Android app and then test it using a virtual device.
Use Eclipse development tool to develop your Android application. You can download it from eclipse.org/downloads/.