In addition: I just noticed, that in the end of the build process the following is stated:
Built the following apk(s):
++devpath++/platforms/android/build/outputs/apk/android-armv7-debug.apk
++devpath++/platforms/android/build/outputs/apk/android-x86-debug.apk
Hence, 2 APKs are built. Is this necessary? If no: How to change that (in Android SDK?)? Which one to abandon?