In Chartboost's Android tutorial there is a step when I need to add chartboost.jar, chartboost.jar.properties, and the doc folder into my project's libs folder. But libs, obj, bin directories are being generated compile time, right? I even don't have them in my repo. I added them to my ignore list. Why I need to create and add in them any files? Is there any other alternative?
libs won't be generated at compile time. It is place where you keep your external library .jar files.
You should not ignore libs folder in your .gitignore
Check this as a template for your .gitignore