Android is one of the dominant operating systems for mobile devices, and Android App Inventor is a free tool for building apps for Android. Starting from setting up your computer to develop and test your Android apps, this guide shows how to create graphical interfaces; define application properties; add interactivity; integrate with the web; build and deploy complete Android apps, and more - all using simple drag-and-drop blocks, and demonstrated here by examples. Use Building Android Apps in easy steps to create your brilliant Android apps without doing any coding!