Gradle native libraries not found on device but present in apk - java-native-interface

Question

My application uses Here SDK and Twilio SDK. Both uses native libraries (Here SDK with native libraries locally plugged in from /libs and /jniLibs folders, Twilio SDK plugged in from jCenter). But on Android 5.1 Here SDK throws exception "MISSING LIBRARIES: libMAPSJNI.so" although this library present in result APK. I opened folder where my program is installed on device and compared content in two cases: with or without Twilio SDK. The difference is that when connected Twilio API folder /lib is a file, and for obvious reasons, the loader can not see inside it native libraries needed initialize Here SDK. If remove the Twilio gradle dependency the assembly occurs normally. What could be a reason and how to fix it? If needed I can attach test project with these libs

Answer 1

You need to modify your build.gradle like this:
android {
(...)
splits {
abi {
enable true
reset()
include 'armeabi-v7a'
universalApk false
}
}
(...)
}
It's probably because Twilio SDK supports x86 and HERE SDK currently doesn't support it.

Answer 2

By defining a splits block you can tell Gradle to create APKs for each listed ABI:
include "armeabi", "armeabi-v7a", "x86", "mips"
Alternatively you can include all desired ABIs into one APK by adding the following filter:
android {
(...)
defaultConfig {
(...)
ndk {
// allow only 32bit *.so libs
abiFilters "armeabi", "armeabi-v7a", "x86", "mips"
}
}
}
Both approaches will exclude 64bit functionality that might clash with the 32bit HERE SDK, but the latter will support more devices with a single APK.
Some libraries, like the new Android Room Persistence library, add 32bit flavors along with the two 64bit ABI flavors arm64-v8a and x86_64. Since HERE SDK at the moment only provides a 32bit lib it should be safe to exclude 64bit lib variants. On the other hand it is expected that 64bit devices can gracefully handle 32bit libs.