NDK遍历sdcard下面的目录（C代码实现，JNI）

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1. #include?<jni.h>??
2. #include?<stdio.h>??
3. #include?<stdlib.h>??
4. #include?<string.h>??
5. #include?<dirent.h>??
6. #include?<time.h>??
7. #include?<android/log.h>??
8. ??
9. ??
10. #define?LOG_TAG?"Test"??
11. #define?LOGI(...)??__android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)??
12. #define?LOGE(...)??__android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)??
13. ??
14. #define?PATHMAX?1024??
15. ??
16. void?searchdir(char?*path);??
17. ??
18. int?total?=?0;??
19. ??
20. ??
21. void?searchdir(char?*path)??
22. {??
23. ????DIR?*dp;??
24. ????struct?dirent?*dmsg;??
25. ????int?i=0;??
26. ????char?addpath[PATHMAX]?=?{'\0'},?*tmpstr;??
27. ????if?((dp?=?opendir(path))?!=?NULL)??
28. ????{??
29. ??????
30. ??????while?((dmsg?=?readdir(dp))?!=?NULL)??
31. ??????{??
32. ??
33. ????????if?(!strcmp(dmsg->d_name,?".")?||?!strcmp(dmsg->d_name,?".."))??
34. ????????????continue;??
35. ????????strcpy(addpath,?path);??
36. ????????strcat(addpath,?"/");??
37. ????????strcat(addpath,?dmsg->d_name);??
38. ????????if?(dmsg->d_type?==?DT_DIR?)??
39. ????????{??
40. ????????????char?*temp;??
41. ????????????temp=dmsg->d_name;??
42. ????????????if(strchr(dmsg->d_name,?'.'))??
43. ????????????{??
44. ???????????????if((strcmp(strchr(dmsg->d_name,?'.'),?dmsg->d_name)==0))??
45. ???????????????{??
46. ?????????????????continue;??
47. ???????????????}??
48. ????????????}??
49. ????????????LOGI("........directname:%s",dmsg->d_name);??
50. ????????????searchdir(addpath);??
51. ????????}??
52. ??????}??
53. ????}??
54. ????closedir(dp);?????
55. }??
56. ??
57. ??
58. JNIEXPORT?jfloat?JNICALL?Java_com_docintest_SimpleNdkActivity_getSecond??
59. ??(JNIEnv?*env,?jobject?thiz)??
60. ??
61. {??
62. ????clock_t???tick_start,tick_end;??
63. ????double?t;??
64. ????char?*dirpath="/mnt/sdcard/";??
65. ????LOGI("begin....................................................?function.");??
66. ????tick_start=clock();??
67. ????searchdir(dirpath);??
68. ????tick_end=clock();??
69. ????float?dtime=?(float)(tick_end-tick_start)/1000/1000;??
70. ????printf(?"Total???time???used:%f???second\n?",dtime);??
71. ????return?dtime;??
72. ??
73. }??

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上（C代码）

（下）JAVA?

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1. package?com.docintest;??
2. ??
3. import?android.app.Activity;??
4. import?android.os.Bundle;??
5. import?android.widget.TextView;??
6. ??
7. public?class?SimpleNdkActivity?extends?Activity?{??
8. ????/**?Called?when?the?activity?is?first?created.?*/??
9. ????@Override??
10. ????public?void?onCreate(Bundle?savedInstanceState)?{??
11. ????????super.onCreate(savedInstanceState);??
12. ????????setContentView(R.layout.main);??
13. ????????TextView?tv=(TextView)findViewById(R.id.second);??
14. ????????tv.setText("Total?time:"+getSecond()+"");??
15. ????}??
16. ??????
17. ????private??native?float??getSecond();??
18. ??????
19. ????static?{??
20. ????????System.loadLibrary("test");??
21. ????}??
22. }??

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