In my KitKat-era Android app I used the S Pen SDK v. 2.3 by adding libspen23.jar to <proj>/libs/.
Meanwhile (2013 -> 2020), Samsung seems to have adopted a new name. The Spen SDK is no longer offered. Samsung offers instead an S Pen Remote SDK, which includes spenremote-v1.0.X.jar and sdk-v1.0.0.jar.
Is the "S Pen remote SDK" a replacement for the "S Pen SDK"?
For reference, the S Pen SDK v. 2.3 was sizeable.
/Users/calaf/prj/proj/libs:
total used in directory 27345 available 478.2 GiB
drwxr-xr-x 4 calaf staff 128 Mar 10 07:52 .
drwxr-xr-x 8 calaf staff 256 Dec 23 08:28 ..
-rw-r--r-- 1 calaf staff 648327 Aug 21 17:00 android-support-v4.jar
-rw-r--r-- 1 calaf staff 4292169 Aug 21 17:00 libspen23.jar
Whereas the S Pen Remote v. 1.0.1 is quite tiny.
/Users/calaf/Downloads/SpenRemoteSDK_v1:
total used in directory 52 available 478.2 GiB
drwxr-xr-x@ 4 calaf staff 128 Dec 26 22:29 .
drwxr-xr-x@ 280 calaf staff 15744 Dec 26 22:29 ..
-rw-r--r--@ 1 calaf staff 2008 Nov 30 2016 sdk-v1.0.0.jar
-rw-r--r--@ 1 calaf staff 23740 Aug 30 2019 spenremote-v1.0.1.jar
as far as I know Spen Remote Sdk is a replacement for spen sdk, spen sdk is for old android versions, deprecated, kind of, Spen remote sdk is, for newer android versions, as a repacement, for remote actions, newer devices, and more, kind of like air actions in settings, or etc.