Compiled JNI library (libmupdf.so), working fine for android 2.2 & Android emulator, but failing on android 2.1

Question

I was able to build the mupdf library for android (libmupdf.so) and I got it working on the emulator. I have used the ndk: android-ndk-r5b & android-ndk-r4b, both work fine.

I have an app. that calls the mupdf library to read a PDF & save it as jpg files to the sdcard.

This works fine on the emulator (both 2.1 and 2.2) as well as on an Android 2.2 device API level 8 (LG Optimus).

However, on the Samsung Galaxy S (Android 2.1-update1 API level 7), the app installs fine, but on running, I'm getting the error :

ERROR/AndroidRuntime: Caused by: java.lang.UnsatisfiedLinkError: Library mupdf not found

I have tried building the library with ndk-r5b as well as prev. versions - ndk-r4, ndk-3 and ndk-r4b. There seems to be no change :(

Any ideas on what might be causing the error?!?! Any suggestions / help is appreciated.

Answer 1

There are some suggestions in the Dalvik JNI Tips document. The first thing to do is look at the logcat output above the exception and see if there's a dlopen() diagnostic.