我正在开发与使用嵌入式的OpenCV提取的视频文件帧本地部分的应用程序。到目前为止，我得到这个错误：

I'm developing an app with native part which uses embedded OpenCV to extract frames from video file. So far I'm getting this error:

.../jni/ocv.c:12: undefined reference to `cvCreateFileCapture'

我的Andr​​oid.mk：

My Android.mk:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := ocv
LOCAL_SRC_FILES := ocv.c

include $(BUILD_SHARED_LIBRARY)

Application.mk：

Application.mk:

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi

ocv.c：

#include <string.h>
#include <jni.h>
#include <stdio.h>
#include <dlfcn.h>
#include <opencv/cv.h>
#include <opencv/highgui.h>

jstring Java_com_ice_salvador_MainActivity_invokeNativeFunction(JNIEnv* env, jobject javaThis) {
    IplImage* currFrame = 0;
    CvCapture* cap = 0;

    cap = cvCaptureFromFile("/mnt/sdcard/vvv.3gp"); //test video

    return (*env)->NewStringUTF(env, "Hello from native code!");
}

我使用的OpenCV-2.4.3-Android的SDK，Android的NDK R8B，Eclipse的朱诺，Windows操作系统。

I'm using OpenCV-2.4.3-android-sdk, Android NDK r8b, Eclipse Juno, Windows.

的IplImage ， CvCapture 得到解决，code编译如果删除符合 cvCaptureFromFile - 所以我想我在正确的道路。我是新来JNI和OpenCV。鸭preciate您的帮助！谢谢你。

IplImage, CvCapture gets resolved and the code compiles if I remove the line with cvCaptureFromFile - so I assume I'm on the right way. I'm new to JNI and OpenCV. Appreciate your help! Thanks.

推荐答案

不离开我自己的问题没有答案。

Not to leave my own question unanswered..

1）我已经改变了Android.mk从SDK包括OpenCV.mk并将其列入。所以lib放到构建：

1) I've changed Android.mk to include OpenCV.mk from SDK and to include .so lib into the build:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

include c:\dev\OpenCV-2.4.3-android-sdk\sdk\native\jni\OpenCV.mk

LOCAL_MODULE    := ocv
LOCAL_SRC_FILES := ocv.c
LOCAL_LDLIBS += -Lc:\dev\OpenCV-2.4.3-android-sdk\sdk\native\libs\armeabi

include $(BUILD_SHARED_LIBRARY)

#LOCAL_PATH := /home/spatialite/jni
include $(CLEAR_VARS)
LOCAL_MODULE := libopencv_java
LOCAL_SRC_FILES := libopencv_java.so
include $(PREBUILT_SHARED_LIBRARY)

2）复制到libopencv_java.so JNI /文件夹。

2) Copied libopencv_java.so to jni/ folder.

3）更改的java code为：

3) Changed java code to:

static {
  System.loadLibrary("opencv_java");
  System.loadLibrary("ocv");
}

和错误已经一去不复返了。

And the error has gone.