Current versionName and versionCode?

[iadcialim]

How do you get the current versionName and versionCode?
My use case is to append some text into the versionName.
For example, current versionName is "1.2.3", then I want it to be "1.2.3-hotfix"

[nathantaal]

+1 for this
versionCode = currentVersionCode + 1