android jni打印log

1. android log 头文件

#include "log.h"
#include<android/log.h>
#include <MNN_jni.h>

#define TAG "NDK"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,TAG ,__VA_ARGS__)

2.打印log
与C中的printf 一样

LOGD("box pos\n");
LOGD("%f %f %f %f\n",box[0],box[1],box[2],box[3]);

3.保存日志
/storage/emulated/0 为手机根目录

 ofstream ofile;
 ofile.open("/storage/emulated/0/jpg_1_out.txt");
 ofile<<"[";
 for (int i = 0;i<coors.size();i+=2)
 {
        if (i > 0)
            ofile<<",";
        LOGD("%f,%f\n",coors[i],coors[i+1]);
        ofile<<"["<<coors[i]<<","<<coors[i+1]<<"]";
 }
 ofile<<"]";
 ofile.close();

4.char *保存yuv图片

 std::ofstream yuvofile;
 yuvofile.open("/storage/emulated/0/input_YUV.yuv");
 for (int i = 0;i<width*height*1.5;i++)
 {
     yuvofile<<buffer[i];
}
yuvofile.close();

android与jni互调暂时写这么多。