How do I find the version of libraries that are being used when my Gradle file mentions a dependency using the \'+\' operator in the version number of the dep
You can use gradles' build-in 'dependencyInsight' task to query the resolved version of your dependency:
gradle dependencyInsight --configuration compile --dependency com.google.android.gms:play-services
If you want to get an overview for all your dependencies in one go, you can do
gradle dependencies
If you use the gradle wrapper you must use ./gradlew instead of gradle