solution found (I am beginner at this)
step one:use another Eclipse, set up configuration , create a sample project, point to the xpages URL
in src onCreate()
http://mobile.tutsplus.com/tutorials/phonegap/creating-an-android-hello-world-application-with-phonegap/
step two: if it works well on emulator, follow this link to export it as apk
http://mobile.tutsplus.com/tutorials/phonegap/creating-an-android-hello-world-application-with-phonegap/
use keystore from debug mode, then we can sign the application without problem if we are lazy
regards
wei