首先创建java层对象

package jp.co.ricoh.advop.mini.idcard;/** * Created by tangzhongliang on 9/16/2016. */public class CardInfo {    int positionX ;    int positionY ;    String path;    int scale;    public CardInfo(int positionX, int positionY, String path,int scale) {        this.positionX = positionX;        this.positionY = positionY;        this.path = path;        this.scale = scale;    }    @Override    public String toString() {        return String.format("start %d,%d,%s,%d",positionX,positionY,path,scale);    }}

 将CardInfo数组传入jni中，在Native层中通过反射的方式访问CardInfo信息

JNIEXPORT jint JNICALL Java_jp_co_ricoh_advop_mini_idcard_ImageHandle_combinecard(JNIEnv * env, jobject obj,jstring dstString,jint width,jint height,jobjectArray objarray){    LOGD("combine card");    jsize len = env->GetArrayLength(objarray);    int ow = (int)width;    int oh = (int)height;    Mat newMat = Mat(Size(ow,oh),CV_8UC3,Scalar(255,255,255));    for(int i = 0;i
    
     GetObjectArrayElement(objarray,(jsize)i);       jclass cls = env->GetObjectClass(cardinfo);       jfieldID fid = env->GetFieldID(cls,"positionX","I");       int x = (int)env->GetIntField(cardinfo,fid);       fid = env->GetFieldID(cls,"positionY","I");       int y = (int)env->GetIntField(cardinfo,fid);       fid = env->GetFieldID(cls,"path","Ljava/lang/String;");       jstring jstr = (jstring)env->GetObjectField(cardinfo,fid);       char* path = jstring2string(env,jstr);       fid = env->GetFieldID(cls,"scale","I");       int scale = (int)env->GetIntField(cardinfo,fid);       //resize       Mat logo = imread(path,-1);       resize(logo,logo,Size(logo.cols*scale,logo.rows*scale));       LOGD("%d,%d,%d",ow,oh,scale);       if(mixImage(newMat,logo,x,y)==-1){           return -1;       }    }    char* dstPath = jstring2string(env,dstString);    imwrite(dstPath,newMat);    LOGD("complete");    return 0;  }