Google Android is a mobile phone operating system based loosely on Linux with a custom Java stack.
In the context of Emacs you are probally interested in either developing applications within Emacs or possibly running EmacsOnAndroid.
For development there are currently only a few approaches:
Help! When I invoked the command android-ant-install, I got the following error message, anyone has seen that, but there is no problem when I invoke ant in the console:
-dex:
[echo] Converting compiled files and external libraries into /home/justin/projects/android-projects/test/bin/classes.dex...
[echo]
[apply]
[apply] trouble processing:
[apply] invalid constant pool index 0000
[apply] ...while parsing attributes[1]
[apply] ...while parsing Code attribute at offset 00000146
[apply] ...while parsing attributes[0]
[apply] ...while parsing methods[0]
[apply] ...while parsing com/test/R.class
[apply] ...while processing com/test/R.class
[apply]
...
[apply] no classfiles specified
BUILD FAILED
Solution: add the $JAVA_HOME/bin to the path environment variable