We're nailed to old versions of Apache Commons as long as we don't increase the minimum SDK. These libraries have various problems which are already fixed in new versions, but we can't use them.
Also, they are not optimized for Android and/or Kotlin.
So maybe it's possible to replace them by (in order of preference):
Kotlin methods
Java methods
Android / support library methods
Guava methods (guess we will still need a general-purpose support library; however we can always use the latest Guava version without problems as I understand it and it's optimized for Android)
We're nailed to old versions of Apache Commons as long as we don't increase the minimum SDK. These libraries have various problems which are already fixed in new versions, but we can't use them.
Also, they are not optimized for Android and/or Kotlin.
So maybe it's possible to replace them by (in order of preference):