UnsatisfiedLinkError in Android

[DonaldDuck313]

I'm trying to use this library in Android. To import it, I use this in build.gradle:

dependencies{
    implementation group: 'net.iakovlev', name: 'timeshape', version: '2020d.12'
}

Then I use it in my Java code like this:

import net.iakovlev.timeshape.TimeZoneEngine;

TimeZoneEngine engine = TimeZoneEngine.initialize();

This compiles just fine, but it crashes at runtime with the following error:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.my_app, PID: 4629
    java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.example.my_app-CnG68M7pV_GWaAOEveKg9Q==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.my_app-CnG68M7pV_GWaAOEveKg9Q==/lib/arm, /system/lib, /product/lib]]] couldn't find "libzstd-jni-1.5.0-4.so"
    Unsupported OS/arch, cannot find /linux/armv7l/libzstd-jni-1.5.0-4.so or load zstd-jni-1.5.0-4 from system libraries. Please try building from source the jar or providing libzstd-jni-1.5.0-4 in your system.
        at java.lang.Runtime.loadLibrary0(Runtime.java:1067)
        at java.lang.Runtime.loadLibrary0(Runtime.java:1007)
        at java.lang.System.loadLibrary(System.java:1667)
        at com.github.luben.zstd.util.Native.load(Native.java:87)
        at com.github.luben.zstd.util.Native.load(Native.java:55)
        at com.github.luben.zstd.ZstdInputStreamNoFinalizer.<clinit>(ZstdInputStreamNoFinalizer.java:23)
        at com.github.luben.zstd.ZstdInputStream.<init>(ZstdInputStream.java:24)
        at net.iakovlev.timeshape.TimeZoneEngine.initialize(TimeZoneEngine.java:235)
        at net.iakovlev.timeshape.TimeZoneEngine.initialize(TimeZoneEngine.java:153)

[RomanIakovlev]

Hi!

Thanks for reporting this. I've not tested Timeshape on Android, so I don't have an answer right off the bat. However, looking at the stack trace you've provided, it seems the problem is with the zstd-jni library.

Could you please try and follow the procedure to add zstd-jni on Android (described here: https://github.com/luben/zstd-jni#android-support) and see if it makes any difference?

[zero0cool0]

I had the same issue.

If it helps someone, simply adding implementation 'com.github.luben:zstd-jni:1.5.2-3@aar' to build.gradle as described in the above link led to duplicate class errors. Instead I used

// Timeshape
implementation('net.iakovlev:timeshape:2020d.12') {
// Exclude standard compression library
  exclude group: 'com.github.luben', module: 'zstd-jni'
}
// Import aar for native component compilation
implementation 'com.github.luben:zstd-jni:1.5.2-3@aar'

[RomanIakovlev]

Thanks for the detailed explanation! Would you mind adding it to readme? Seems really useful for people running Timeshape on Android.

[RomanIakovlev]

Closing based on lack of activity. Hopefully the instructions in readme now provide a clear path to run Timeshape on Android.