This book contains a selection of lecture notes from an introductory mobile applications development course that the author teaches at Cleveland State University. Its goal is to help you become a competent Android app developer. The reader is expected to have a solid grasp of Java programming and computer-oriented problem-solving skills. The pedagogical approach is based on learning-through-examples, emphasizing the joy of hands-on programming experiences. Each lesson begins with a review of concepts and is followed by various step-by-step tutorials where the student constructs “real-life” working apps. The included apps are annotated, complete and functional. Apps have been chosen to illustrate fundamental concepts from the Android world, as well as best practices in the field.