(This book takes the architecture of Android operating system as the guide and the development of Android application as the latitude to introduce its practical technology. It completely introduces the functions of Android version 2.3 (widget, layout form layout, menu, sqlite, service service program, application globalization, webview, app widget, gps orientation and google maps, audio and video, 2d drawing and 3d opengl drawing, etc.). The main topics of sample program design are wide)