We're frequently asked by professors, teachers, and other educators about materials they can use in their lectures or coursework above and beyond those found in our books. Our publisher has a great site for this purpose: Pearson Education. They create slides and other teaching materials for the various books, including Android Wireless Application Development and Sam's Teach Yourself Android Application Development in 24 Hours. We don't know exactly when the materials are available, but it is usually some time after the book is available for purchase. If you have any trouble obtaining teaching materials on a particular topic, don't hesitate to contact our publisher, Pearson Education team support or us directly and we will try to accommodate your requests as best we can.