i want to develop an application on android,webos,wince. how to develop application that should run on all paltform with developing each paltform
There are also a variety of frameworks that allow you to compile them into native apps for multiple platforms. They typically wont nail every platform, but they will provide a way to make native apps for multiple platforms at once.
Examples are:
Titanium Appcelerator
Rhomobile
PhoneGap