CODEWITHSUNDEEP
javaandroidjava-native-interfaceandroid-ndk
Brian D
Brian D

Reputation: 10163

JNI and Android... UnsatisfiedLinkError

Man... this bug has got me down.

Logcat:

01-29 22:25:00.293: ERROR/AndroidRuntime(27386): FATAL EXCEPTION: main
01-29 22:25:00.293: ERROR/AndroidRuntime(27386): java.lang.IllegalStateException: Could not execute method of the activity
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.view.View$1.onClick(View.java:2072)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.view.View.performClick(View.java:2408)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.widget.CompoundButton.performClick(CompoundButton.java:99)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.view.View$PerformClick.run(View.java:8819)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.os.Handler.handleCallback(Handler.java:587)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.os.Looper.loop(Looper.java:123)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.app.ActivityThread.main(ActivityThread.java:4627)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at java.lang.reflect.Method.invokeNative(Native Method)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at java.lang.reflect.Method.invoke(Method.java:521)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at dalvik.system.NativeStart.main(Native Method)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386): Caused by: java.lang.reflect.InvocationTargetException
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at com.example.viewer.Viewer.denoiseSlice(Viewer.java:170)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at java.lang.reflect.Method.invokeNative(Native Method)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at java.lang.reflect.Method.invoke(Method.java:521)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at android.view.View$1.onClick(View.java:2067)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     ... 12 more
01-29 22:25:00.293: ERROR/AndroidRuntime(27386): Caused by: java.lang.UnsatisfiedLinkError: RicianDenoise
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     at com.example.viewer.Viewer.RicianDenoise(Native Method)
01-29 22:25:00.293: ERROR/AndroidRuntime(27386):     ... 16 more

Loading the Library and declaring it:

    public native void RicianDenoise(int w, int h, int p, 
        short [] s_noised_slice, double [] d_noised_slice, 
        short [] s_denoised_slice, double [] d_denoised_slice);

    static {
        System.loadLibrary("denoise");
    }

C Function:

void 
Java_com_example_viewer_Viewer_RicianDenoise (JNIEnv *env, jclass cls, jint M, 
                                              jint N, jint P, jshort * s_noised_slice,
                                              jdouble * d_noised_slice, 
                                              jshort * s_denoised_slice, 
                                              jdouble * d_denoised_slice) {
    /* ... */
}

I ran

ndk-build -B -C [project]/jni

and I can't get anything to work. Any suggestions, or experience with this issue? The invocation line in the logcat is me just trying to call the function, btw. Thank you... please be my hero :(

Upvotes: 0

Views: 2377

Answers (2)

Hemang Shah
Hemang Shah

Reputation: 58

Arrays in java do not translate into array type pointers in C/C++, in JNI

Use this scheme on the native side to declare your arrays:
for double[] use jdoubleArray
for short[] use jshortArray

Upvotes: 1

Jochen Bedersdorfer
Jochen Bedersdorfer

Reputation: 4122

Does your library use other C/C++ libraries and are those reachable using the system path?

Upvotes: 0

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