Reading QR Code with Kotlin Mobile App

[witwaycorp]

Hi team,

Not sure if this is the right place for this but having an issue reading QR code with a test Kotlin app to get the nodeid and some nonce and then connect to backend Iroh node. Wondering if anyone has any samples of this. My app just crashes when I scan or add info manually. Thanks.

[flub]

Hey, this seems like it is very far away from iroh. You should start with figuring out the reason your app crashes, try create backtraces or some other stack dump at the time of the crash. Then narrow down where it goes wrong. If it does originate somewhere in iroh than come back with the backtrace and debug logging to see if it can be narrowed down wrt to iroh.

[witwaycorp]

yep I get that. was hoping for some example like the ones provided but definitely digging deeper into it. thanks.

[flub]

sorry, i'm not aware of any kotlin examples doing this.

[witwaycorp]

no worries. your suggestions helped a bit:
2026-07-13 18:45:35.225 32317-32317 AndroidRuntime com.mydomain.myapp E FATAL EXCEPTION: main
Process: com.mydomain.myapp, PID: 32317
java.lang.UnsatisfiedLinkError: Unable to load library 'iroh_ffi':
dlopen failed: library "libiroh_ffi.so" not found
dlopen failed: library "libiroh_ffi.so" not found
dlopen failed: library "libiroh_ffi.so" not found
Native library (android-aarch64/libiroh_ffi.so) not found in resource path (.)
at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:325)
at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:481)

[witwaycorp]

still struggling to get my app to load libiroh_ffi.so and iroh_ffi. tried the hello-iroh-ffi sample and that fails with another issue around unable to load computer.iroh.dot

[witwaycorp]

turned out I had to manually build the .so libraries and do so on a linux/mac device. Because I am running on Windows, had to do the compile on Ubuntu on WSL: cargo ndk -o kotlin/android/src/main/jniLibs
-t arm64-v8a -t x86_64
build --release --lib -p iroh-ffi