NDK遍历sdcard下面的目录（C代码实现，JNI）

#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <time.h>
#include <android/log.h>


#define LOG_TAG "Test"
#define LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)

#define PATHMAX 1024

void searchdir(char *path);

int total = 0;


void searchdir(char *path)
{
    DIR *dp;
    struct dirent *dmsg;
    int i=0;
    char addpath[PATHMAX] = {'\0'}, *tmpstr;
    if ((dp = opendir(path)) != NULL)
    {

      while ((dmsg = readdir(dp)) != NULL)
      {

        if (!strcmp(dmsg->d_name, ".") || !strcmp(dmsg->d_name, ".."))
            continue;
        strcpy(addpath, path);
        strcat(addpath, "/");
        strcat(addpath, dmsg->d_name);
        if (dmsg->d_type == DT_DIR )
        {
            char *temp;
            temp=dmsg->d_name;
            if(strchr(dmsg->d_name, '.'))
            {
               if((strcmp(strchr(dmsg->d_name, '.'), dmsg->d_name)==0))
               {
                 continue;
               }
            }
            LOGI("........directname:%s",dmsg->d_name);
            searchdir(addpath);
        }
      }
    }
    closedir(dp);
}


JNIEXPORT jfloat JNICALL Java_com_docintest_SimpleNdkActivity_getSecond
  (JNIEnv *env, jobject thiz)

{
    clock_t   tick_start,tick_end;
    double t;
    char *dirpath="/mnt/sdcard/";
    LOGI("begin.................................................... function.");
    tick_start=clock();
    searchdir(dirpath);
    tick_end=clock();
    float dtime= (float)(tick_end-tick_start)/1000/1000;
    printf( "Total   time   used:%f   second\n ",dtime);
    return dtime;

}

 

上（C代码）

（下）JAVA 

 

 

 

package com.docintest;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class SimpleNdkActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView tv=(TextView)findViewById(R.id.second);
        tv.setText("Total time:"+getSecond()+"");
    }

    private  native float  getSecond();

    static {
        System.loadLibrary("test");
    }
}

 

结果：