After the installation of my ant in my windows 7 . In cmd i typed ant -v it\'s given the ant version but it says the following also.
Buildf
If you couldn't find the build.xml file in your project then you have to build it to be able to debug it and get your .apk
you can use this command-line to build:
android update project -p "project full path"
where "Project full path" -- Give your full path of your project location
after this you will find the build.xml then you can debug it.