如果要在基于Motorola OS的手机上开发java应用程序的话，一定要阅读此开发指南。非常有帮助

This guide provides useful information for developers who want to develop JavaTM ME (Micro Edition)
applications—known as MIDlets—for Motorola handsets running Motorola OS. It includes information on
support APIs, details on developing and packaging applications for installation, as well as a step-by-step
procedure for settiing up a debug environment. It does not teach you about Java ME or provide basics on
developing Java ME applications; we assume you already know how to do that.
This document is intended for application developers who are already familiar with Java ME development
and want to know how to develop MIDlets for Motorola handsets.