About the Reviewers

Roger Belk is a 45-year-old self-taught Android developer with 20 + apps in Google’s Play Store under the developer name BigTexApps. He started out using Google’s & MIT’s App Inventor and then after two years of learning to use AI, he taught himself to use Java to build Android apps. He has reviewed two other books, Google App Inventor, Ralph Roberts, Packt Publishing (ISBN 978-1-84969-212-0) and Android 3.0 Animation, Alex Shaw, Packt Publishing (ISBN 978-1-84951-528-3).

Frank Grützmacher spent some years in the research of distributed electronic design tools and worked for several German blue chip companies such as Deutsche Post and AEG. He was involved in Android platform extensions for a mobile manufacturer. Therefore, on one hand he knows how to build large enterprise apps and on the other hand how to make Android system apps.

He is currently working for the IT daughter of the largest German Telco company.

In the past, he has reviewed Corba- and Java-related books for American and German publishers.

Sylvain Ratabouil is a confirmed IT consultant experienced with C++ and Java technologies. He worked in the space industry and got involved in aeronautic projects at Valtech, where he is now taking part in the digital revolution.

As a technology lover, he is passionate about mobile technologies and cannot live or sleep anymore without his Android smart phone.