On Feb 17, 2012, at 11:41 AM, Goncalo Oliveira wrote:
> So, here's what I did
>
> 1. Added the .so library to the project under
> /NativeLibraries/armeabi/libsdk.so
> 2. Set the library's build action to AndroidNativeLibrary
> 3. Added the java source file under /JavaSources/libmsg.java
> 4. Set the file's build action to AndroidJavaSource
Sanity check: unzip the apk and make sure that lib/armeabi/libsdk.so is inside
the .apk.
> I compile the whole thing, deploy to device and start debugging. When I click
> the button that calls the LibAPI.HasStarted() I get an
> Java.Lang.UnsatisfiedLinkError.
Can you provide the full stack trace for the UnsatisfiedLinkError?
I can think of three different reasons for the UnsatisfiedLinkError:
1. The native library is compiled for an architecture that your device doesn't
support. For example, if the .so is an armeabi-v7a library and you try to load
it on an armeabi device, this can fail. I don't think this is the case here,
but it's otherwise possible.
2. The com.alk.sdk.AlkMsg type doesn't have a static constructor which calls
System.loadLibrary("sdk"), and instead requires that "external" code call
System.loadLibrary(). If this is the case, then you should add a call to
Java.Lang.JavaSystem.LoadLibrary("sdk") during your startup code, sometime
before you call AlkMsg.Msg_HasStarted().
3. The native library has been improperly linked, and dlopen() refuses to load
the library. This requires NDK tools to validate.
I would hope that (2) is the problem, and that the JavaSystem.LoadLibrary()
call would fix it.
If (2) doesn't fix it, you could try using the C API that they provide via
P/Invoke and [DllImport]. This would still fail if the problem is due to (3).
Using a P/Invoke interface would also allow skipping the Java class and JNIEnv
use, so it may be preferable, but without knowing _why_ the
UnsatisfiedLinkError is being thrown, it's difficult to know what the actual
reason is.
Thanks,
- Jon
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