Look the commits 2eb41137130756d6d69137cef42db8df40e4da88, 6beb867c94014eb3ffadb510e73c82f1b5c7a10e and 839197871a99f1e4571af3160428f7a7c3e72610 how declare dependency and use zstd-jni in Android app.
The rest is boilerplate created from Android studio.