You said that there are several APK files in the folder, but here you include only one possible file, which you need to name exactly "HexPath-android-release.apk". Do you have this file?
If you want this file to be copied every time, I suggest rewriting the end like this:
from('HexPath-android/build/apk/HexPath-android-release.apk') { rename { outpuFile } } into('output/android/')
But if you want to copy multiple files, go to the "include" segment to have some wildcards, and possibly closure to create your output names. Hope this helps.
In addition, this is not the HexPath android project itself. Shouldn't you start the path only with 'build ...'?
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