无法在 OpenCV Android 示例中链接本机库 [英] Unable to link native library in OpenCV Android sample
问题描述
我有想要在 Android 中使用的 OpenCV 代码 (c++).为此，我必须使用 Android NDK.我下载了 用于 Android 开发的 OpenCV 包(2.4.0 版)和完成了该手册中的所有步骤.基本示例(仅限 Java API)运行没有问题.示例 #3 (教程 3(高级)- 添加本机 OpenCV) 从 ndk-builder 正确构建.但是当我尝试从 Eclipse 在设备上运行/调试它时总是出现异常:
I have OpenCV code (c++), which I want to use in Android. To do this I have to use Android NDK. I downloaded OpenCV package for Android development (ver. 2.4.0) and did all steps from that manual. Basic samples (Java API only) run without problems. Sample #3 (Tutorial 3 (Advanced) - Add Native OpenCV) builds from ndk-builder correctly. But always got exception when I'm trying to run/debug it on device from eclipse:
Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lorg/opencv/samples/tutorial3/Sample3View;
在这一行:
System.loadLibrary("native_sample");
这里是完整的 logcat 日志:
Here's full logcat log:
05-31 23:41:45.976: W/ActivityThread(9708): Application org.opencv.samples.tutorial3 is waiting for the debugger on port 8100...
05-31 23:41:45.983: I/System.out(9708): Sending WAIT chunk
05-31 23:41:45.983: I/dalvikvm(9708): Debugger is active
05-31 23:41:46.179: I/System.out(9708): Debugger has connected
05-31 23:41:46.179: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:46.382: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:46.585: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:46.788: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:46.983: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:47.186: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:47.389: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:47.585: I/System.out(9708): waiting for debugger to settle...
05-31 23:41:47.788: I/System.out(9708): debugger has settled (1463)
05-31 23:41:47.819: D/szipinf(9708): Initializing inflate state
05-31 23:41:47.866: I/Sample::Activity(9708): Instantiated new class org.opencv.samples.tutorial3.Sample3Native
05-31 23:41:48.909: D/dalvikvm(9708): threadid=1: still suspended after undo (sc=1 dc=1)
05-31 23:41:51.770: I/Sample::Activity(9708): onCreate
05-31 23:41:59.283: W/dalvikvm(9708): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lorg/opencv/samples/tutorial3/Sample3View;
05-31 23:42:01.965: D/AndroidRuntime(9708): Shutting down VM
05-31 23:42:01.965: W/dalvikvm(9708): threadid=1: thread exiting with uncaught exception (group=0x40015560)
05-31 23:42:01.999: E/AndroidRuntime(9708): FATAL EXCEPTION: main
05-31 23:42:01.999: E/AndroidRuntime(9708): java.lang.ExceptionInInitializerError
05-31 23:42:01.999: E/AndroidRuntime(9708): at org.opencv.samples.tutorial3.Sample3Native.onCreate(Sample3Native.java:21)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.os.Handler.dispatchMessage(Handler.java:99)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.os.Looper.loop(Looper.java:130)
05-31 23:42:01.999: E/AndroidRuntime(9708): at android.app.ActivityThread.main(ActivityThread.java:3835)
05-31 23:42:01.999: E/AndroidRuntime(9708): at java.lang.reflect.Method.invokeNative(Native Method)
05-31 23:42:01.999: E/AndroidRuntime(9708): at java.lang.reflect.Method.invoke(Method.java:507)
05-31 23:42:01.999: E/AndroidRuntime(9708): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
05-31 23:42:01.999: E/AndroidRuntime(9708): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
05-31 23:42:01.999: E/AndroidRuntime(9708): at dalvik.system.NativeStart.main(Native Method)
05-31 23:42:01.999: E/AndroidRuntime(9708): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load native_sample: findLibrary returned null
05-31 23:42:01.999: E/AndroidRuntime(9708): at java.lang.Runtime.loadLibrary(Runtime.java:429)
05-31 23:42:01.999: E/AndroidRuntime(9708): at java.lang.System.loadLibrary(System.java:554)
05-31 23:42:01.999: E/AndroidRuntime(9708): at org.opencv.samples.tutorial3.Sample3View.<clinit>(Sample3View.java:48)
05-31 23:42:01.999: E/AndroidRuntime(9708): ... 14 more
我找到了相同问题的解决方案，但没有一个对我没有帮助:
I find solutions for the same problem but none of them didn't help me:
- Android 原生 OpenCV 示例引发 UnsatisfiedLinkError
- java.lang.UnsatisfiedLinkError: 无法加载 opencv_java: findLibrary 返回 null
- OpenCV-Android for Windows 安装和运行的主要问题(没有回答)
- Native OpenCV Samples for Android throws UnsatisfiedLinkError
- java.lang.UnsatisfiedLinkError: Couldn't load opencv_java: findLibrary returned null
- Major OpenCV-Android for Windows Installing and Running Issues (no answer)
我还在不同的设备和 Android API 版本上对其进行了测试.
Also I have tested it on different devices and Android API versions.
我的系统配置:
astor@astor-K42Jv:~$ uname -a
Linux astor-K42Jv 3.2.0-24-generic-pae #39-Ubuntu SMP Mon May 21 18:54:21 UTC 2012 i686 i686 i386 GNU/Linux
<小时>
我已经尝试解决这个问题 4 晚(这是我的空闲时间 :))，但没有运气.我的论文真的需要这个，所以任何帮助都将不胜感激.
I've been tried to fix this problem for 4 nights (it's my free time :) ), but with no luck. I really need this for my thesis, so any help will be appreciated.
更新:我已经在 Windows 7 (64) 上测试了这个示例，但结果是一样的.
Update: I have tested this sample on Windows 7 (64), but result is the same.
这似乎是 OpenCV 的 bug.
It seems that this is OpenCV bug.
更新:构建日志:
astor@astor-K42Jv:/opt/eclipse-android/workspace/OpenCV-2.4.0-samples/tutorial-3-native$ ndk-build
Install : libnative_camera_r2.2.0.so => libs/armeabi-v7a/libnative_camera_r2.2.0.so
Install : libnative_camera_r2.3.3.so => libs/armeabi-v7a/libnative_camera_r2.3.3.so
Install : libnative_camera_r3.0.1.so => libs/armeabi-v7a/libnative_camera_r3.0.1.so
Install : libnative_camera_r4.0.0.so => libs/armeabi-v7a/libnative_camera_r4.0.0.so
Install : libnative_camera_r4.0.3.so => libs/armeabi-v7a/libnative_camera_r4.0.3.so
Install : libnative_sample.so => libs/armeabi-v7a/libnative_sample.so
推荐答案
哇哦！
终于我自己找到了解决这个问题的方法！
Finally I found solution for this problem by myself!
我决定调试线路:
System.loadLibrary("native_sample");
为此，我从 Android-SDK 下载了 android 源代码，然后将源文件夹 (/opt/android-sdk-linux/sources/android-15) 附加到我的项目中.在此之后我发现错误是:
To do this I downloaded android source code from Android-SDK and then attached source folder (/opt/android-sdk-linux/sources/android-15) to my project. After this I found that error was:
Cannot load library: link_image[1936]: 37 could not load needed library 'libopencv_java.so' for 'libhello-jni.so' (load_library[1091]: Library 'libopencv_java.so' not found)
而且这个库实际上不在 lib 目录中.我不知道为什么，但 ndk-build 忽略了它.所以我决定手动复制和加载它.为此，我从 /opt/OpenCV-2.4.0/libs/armeabi-v7a 复制了 libopencv_java.so 并编辑了 java 代码:
And really this library is not in lib directory. I don't know why but ndk-build ignored it. So i decided to copy and load it manualy. For this I copied libopencv_java.so from /opt/OpenCV-2.4.0/libs/armeabi-v7a and also edited java code:
static {
System.loadLibrary("opencv_java"); //load opencv_java lib
System.loadLibrary("native_sample");
}
其实类似的问题有:
从第二个解决方案我发现我可以使用 dlopen，但我还没试过.
From second solution I found that I can load libraries using dlopen, but I haven't tried it yet.
所以我将编写简单的 bash 脚本，为自己完成(只是复制).
So I will write simple bash-script that will do it (just copy) for myself.
谢谢大家.
这篇关于无法在 OpenCV Android 示例中链接本机库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
