android - OpenCV for android 示例程序显示错误

Question

我已经下载了 Android 的 OpenCV 项目，并且与它 bundle 在一起的示例项目包含几个错误....只有包含 NDK 代码的项目才有错误....问题是 C++ 代码显示了很多错误...无法识别像 jstring 这样的关键字。请帮我解决这个问题...提前感谢您抽出宝贵时间

#include <jni.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/features2d/features2d.hpp>
#include <vector>

using namespace std;
using namespace cv;

extern "C" {
JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial3_Sample3View_FindFeatures(JNIEnv* env, jobject, jint width, jint height, jbyteArray yuv, jintArray bgra)
{
    jbyte* _yuv  = env->GetByteArrayElements(yuv, 0);
    jint*  _bgra = env->GetIntArrayElements(bgra, 0);

    Mat myuv(height + height/2, width, CV_8UC1, (unsigned char *)_yuv);
    Mat mbgra(height, width, CV_8UC4, (unsigned char *)_bgra);
    Mat mgray(height, width, CV_8UC1, (unsigned char *)_yuv);

    //Please make attention about BGRA byte order
    //ARGB stored in java as int array becomes BGRA at native level
    cvtColor(myuv, mbgra, CV_YUV420sp2BGR, 4);

    vector<KeyPoint> v;

    FastFeatureDetector detector(50);
    detector.detect(mgray, v);
    for( size_t i = 0; i < v.size(); i++ )
        circle(mbgra, Point(v[i].pt.x, v[i].pt.y), 10, Scalar(0,0,255,255));

    env->ReleaseIntArrayElements(bgra, _bgra, 0);
    env->ReleaseByteArrayElements(yuv, _yuv, 0);
}

}

错误..

Unresolved inclusion: <vector>
Symbol 'std' could not be resolved

Answer 1

@Nolan 的回答和@Michael 的评论为我解决了这个问题。以下是组合步骤:

1. 在 Eclipse 中，右键单击您的项目并选择属性(顺便说一句，这是在 Mac 上)
2. 展开C/C++ 通用
3. 选择路径和符号
4. 在语言下选择GNU C++

5. 以下包含应在包含目录

   下定义

   ${NDKROOT}/platforms/android-9/arch-arm/usr/include
   ${ProjDirPath}/../../sdk/native/jni/include
   ${NDKROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/libs/armeabi-v7a/include
   ${NDKROOT}/sources/cxx-stl/gnu-libstdc++/4.4.3/include
   

6. 确保 ${NDKROOT} 被定义为环境变量。如果没有，请继续将其添加到 C/C++ Build - Environment

下
7. 现在继续并通过右键单击您的项目并选择 Index - Rebuild 重建索引

干杯。