Android App Digital Persona couldn't find "libdpfr6.so"

Question

I am developing an Android App that uses fingerprint reader Digital Persona 4500 UareU. When I trying to get the readers I get this error:

E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.UnsatisfiedLinkError: 
        dalvik.system.PathClassLoader[DexPathList
        [[zip file "/data/app/com.zaimella.enrollment-1/base.apk"],
        nativeLibraryDirectories=[
        /data/app/com.zaimella.enrollment-1/lib/arm, 
        /system/lib, 
        /vendor/lib]]] 
        couldn't find "libdpfr6.so"
    at java.lang.Runtime.loadLibrary0(Runtime.java:984)
    at java.lang.System.loadLibrary(System.java:1567)
    at com.digitalpersona.uareu.jni.Dpfpdd.<init>(Dpfpdd.java:43)
    at com.digitalpersona.uareu.dpfpdd.ReaderCollectionImpl.<init>(ReaderCollectionImpl.java:24)
    at java.lang.Class.newInstance(Native Method)
    at com.digitalpersona.uareu.UareUGlobal.GetReaderCollection(UareUGlobal.java:39)

Please HELP !!!

Thanks.

Answer 1

The SOLUTION !!!

1.- Install DigitalPersona SDK
2.- Get jniLibs from the installation: DigitalPersona\U.are.U SDK\Android\bin\android-21
3.- You must include the jniLibs folder into your project. See picture 1
4.- Build -> Make Project
5.- Be sure that jniLibs are included into your apk file. See picture 2
6.- Install the App using "adb install"
7.- BE HAPPY !!!

jniLibs folder into your project

jniLibs folder into your apk file

Answer 2

It worked for me when I downgraded my gradle plugin to version '3.3.0' as shown below:

dependencies {
    classpath 'com.android.tools.build:gradle:3.3.0'
}