couldn't find "libserial.so"'

[Mustafa33-max]

couldn't find "libserial.so"'
Java.Lang.UnsatisfiedLinkError
Message=dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/SerialPortPoc.SerialPortPoc-Xu8kvNoUVC6xB8M2zCtTbg==/base.apk"],nativeLibraryDirectories=[/data/app/SerialPortPoc.SerialPortPoc-Xu8kvNoUVC6xB8M2zCtTbg==/lib/arm64, /data/app/SerialPortPoc.SerialPortPoc-Xu8kvNoUVC6xB8M2zCtTbg==/base.apk!/lib/arm64-v8a, /system/lib64]]] couldn't find "libserial.so"

[Mustafa33-max]

which sdk to use

[Dr-Primary]

https://github.com/guojiahuiEmily/serial-android this fork has a 64 bit version of the libserial.so file. you will need to make a 'lib' folder under the android project with an 'arm64-v8a' folder inside it. Put the libserial from the other fork in the folder and set its build action to androidnativelibrary.
or you could just use the other fork.