Im trying to embedd this library in my android project.
I did very little, as said in their wiki, added the gradle compile line compile \'com.nhaarman.listviewanimations:l
The problem is that you have at least two libraries included in your project using nineoldandroids library
but one of them is using the jar file in the libs folder of your project while the other is referencing it somewhere else probably Maven.
So the solution is to remove the jar file from your libs folder and delete the following line from build.gradle
compile files('libs/nineoldandroids-2.4.0.jar')