I believe I\'ve followed the instructions in the Android SDK, and I\'m now trying to build the sample LunarLander (random one picked)
$ cd samples/android-11
You need to execute this command:
android update project --target --path
which will create the needed build.xml within the example directory, then the ant debug command should work.
ant debug
Take a look here.
*You can use android list targets to choose what build target to use for your project.
android list targets