DexGuard removes native libraries (.so files)

[jukka828]

General information

• SDK/Library version: 5.5.1
• Android Version and Device: Happens with all devices

Issue description

When using DexGuard for obfuscating our application which uses the card.io library, all card.io native libraries (.so files) get removed from the final apk. DexGuard is a commercial extension of ProGuard. It removes all native libraries that it thinks are not used, unlike ProGuard which doesn't touch the native libraries.

The reason why DexGuard removes them for card.io is that in the CardScanner.java the native libraries are loaded differently than what DexGuard requires. They say in their documentation "... you should make sure that your code loads each native library with System.loadLibrary("mycode"), with the name specified as a string literal or constant.". But in CardScanner.java the libraries are loaded with a String variable inside the method "loadLibrary(String libraryName)". That's why DexGuard doesn't find the link between the native libraries and the Java code.

I wrote a fix for this locally and the native libraries are working with it in our application, but I haven't tried with ProGuard. I can send a patch file if needed.