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Can not run OpenCV samples with native C++ code

asked 2014-07-26 21:12:50 -0500

Ryma gravatar image

updated 2014-07-27 00:33:53 -0500

berak gravatar image

Hello,

I'm a newbie in Android developing and it's the first time I use OpenCV. Following OpenCV guide, I managed to run 6 of the 9 applications. The remaining 3 are the one with native C++ code: "Face_detection", "Native_activity" and "mixed_processing". I added the NDK path, at first I added a environment variable NDKROOT, but finally I put the full path.

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The Android target is 4.4w (API20)

When I run the application, the message written in the console was:

02:43:08 * Auto Build of configuration Default for project OpenCV Sample - native-activity * "C:\Works\android-ndk-r9d\ndk-build.cmd" Android NDK: WARNING:jni/Android.mk:native_activity: non-system libraries in linker flags: -lopencv_java
Android NDK: This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES
Android NDK: or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the
Android NDK: current module
[armeabi-v7a] Gdbserver : [arm-linux-androideabi-4.6] libs/armeabi-v7a/gdbserver [armeabi-v7a] Gdbsetup : libs/armeabi-v7a/gdb.setup [armeabi-v7a] Install : libnative_activity.so => libs/armeabi-v7a/libnative_activity.so

And those are the errors in the LogCat:

07-27 02:43:18.497: E/dalvikvm(2439): dlopen("/data/app-lib/org.opencv.samples.NativeActivity-2/libnative_activity.so") failed: Cannot load library: load_library(linker.cpp:761): not a valid ELF executable: /data/app-lib/org.opencv.samples.NativeActivity-2/libnative_activity.so 07-27 02:43:18.497: D/AndroidRuntime(2439): Shutting down VM 07-27 02:43:18.497: W/dalvikvm(2439): threadid=1: thread exiting with uncaught exception (group=0xa6186908) 07-27 02:43:18.497: E/AndroidRuntime(2439): FATAL EXCEPTION: main 07-27 02:43:18.497: E/AndroidRuntime(2439): java.lang.UnsatisfiedLinkError: Cannot load library: load_library(linker.cpp:761): not a valid ELF executable: /data/app-lib/org.opencv.samples.NativeActivity-2/libnative_activity.so 07-27 02:43:18.497: E/AndroidRuntime(2439): at java.lang.Runtime.loadLibrary(Runtime.java:371) 07-27 02:43:18.497: E/AndroidRuntime(2439): at java.lang.System.loadLibrary(System.java:535) 07-27 02:43:18.497: E/AndroidRuntime(2439): at org.opencv.samples.NativeActivity.CvNativeActivity$1.onManagerConnected(CvNativeActivity.java:21) 07-27 02:43:18.497: E/AndroidRuntime(2439): at org.opencv.android.AsyncServiceHelper$1.onServiceConnected(AsyncServiceHelper.java:318) 07-27 02:43:18.497: E/AndroidRuntime(2439): at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1101) 07-27 02:43:18.497: E/AndroidRuntime(2439): at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1118) 07-27 02:43:18.497: E/AndroidRuntime(2439): at android.os.Handler.handleCallback(Handler.java:725) 07-27 02:43:18.497: E/AndroidRuntime(2439): at android.os.Handler.dispatchMessage(Handler.java:92) 07-27 02:43:18.497: E/AndroidRuntime(2439): at android.os.Looper.loop(Looper.java:137) 07-27 02:43:18.497: E/AndroidRuntime(2439): at android.app.ActivityThread.main(ActivityThread.java:5041) 07-27 02:43:18.497: E/AndroidRuntime(2439): at java.lang.reflect.Method.invokeNative(Native Method) 07-27 02:43:18.497: E/AndroidRuntime(2439): at java.lang.reflect.Method.invoke(Method.java:511) 07-27 02:43:18.497: E/AndroidRuntime(2439): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 07-27 ...

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answered 2014-07-27 08:43:42 -0500

FLY gravatar image

updated 2014-07-27 08:46:11 -0500

The below link work for me , follow the link step by step and read it carefully

Opencv with android

Also check point 10 from link in your configuration

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Thanks for answering, that was very nice of you. I think that the probleme is due to the lack of NDK plugins. When I add the link "https://dl-ssl.google.com/android/eclipse/" to install NDK plugins, It does not show up.

Ryma gravatar imageRyma ( 2014-07-29 14:10:50 -0500 )edit
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Asked: 2014-07-26 21:12:50 -0500

Seen: 1,225 times

Last updated: Jul 27 '14