I\'ve been working with AS 1.4 for quite a while and new native debugging feature is especially useful.
However native debugging does not work on my Samsung Galaxy N
See https://code.google.com/p/android/issues/detail?id=187003
You need root access on your device, but then chmod 4750 /system/bin/run-as may solve the problem.
chmod 4750 /system/bin/run-as
If you don't have root access, you can modify your app, and start LLDB server with your package's identity, using Runtime.exec().
Runtime.exec()