when porting android 2.2 application on android1.6 platform

I have developed an application on android2.2. when I install this application on actual 开发者_如何学Cdevice having android1.6 then it gives me error "java.lang.string" when click on a button. does somebody has any idea what may be the cause and how to eradic

Thanks Parvendra

Android 1.6 doesn't support some functions/methods available for Android 2.2 To see them just recompile your project under API SDK 3 - and you'll see what gives you mentioned exception