Error:(27, 0) Project with path ':library' could not be found in project ':app'
Create a settings.gradle file in the root of your project and add
include ':library' to the file. Just like this image:
In your RippleSample/settings.gradle you have to add:
include ':app' , ':library'
Put the jar into the libs folder
Right click it and hit 'Add as library'
Ensure that compile files('libs/jar') is in your build.gradle file
Do a clean build