When building for Android, Titanium currently only supports targeting API Levels 23-25 (aka: Android 6.0 - 7.1) if not specified in the "tiapp.xml" file. We should increase the max API Level supported to 27 (aka: Android 8.1) once full functional/regression testing has been performed and any issues discovered have been addressed.
This involves changing the "package.json" file's "android sdk" range...
from: ">=23.x <25.x"
to: ">=23.x <27.x".
We should also consider updating the "android build tools" version range as well.
Titanium developers currently can opt-in to targeting API Level 26+ (aka: Android 8.x) in the "tiapp.xml" themselves as shown below.