develop android apps in xcode

hi im trying to develop an android app in xcode. ive downloaded java, java jdk and the andr开发者_开发知识库oid sdk and have loaded a half finished (but working with no errors) app. i also changed the target to:

Build Tool: /usr/bin/ant

Arguments: install

but when i try to build it i get

Build file build.xml does not exist

i couldn't figure out how to make my own build.xml so downloaded one but still no luck. Id really appreciate some help.