android开发：jni下native代码获取毫秒级时间

#include <android/log.h>
#define LOG_TAG ""
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)



struct timeval xTime;
int xRet = gettimeofday(&xTime, NULL);
long long xFactor = 1;
long long now = (long long)(( xFactor * xTime.tv_sec * 1000) + (xTime.tv_usec / 1000));
LOGD("sec_d = %d, sec_ld = %ld, sec_lld = %lld\n", xTime.tv_sec, xTime.tv_sec, xTime.tv_sec);
LOGD("usec_d = %d, usec_ld = %ld, usec_lld = %lld\n", xTime.tv_usec, xTime.tv_usec, xTime.tv_usec);
LOGD("now_d = %d, now_ld = %ld, now_ld = %lld\n", now, now, now);

LOGD("sizeof(int) = %d\n", sizeof(int));
LOGD("sizeof(long) = %d\n", sizeof(long));
LOGD("sizeof(long long) = %d\n", sizeof(long long));

sec_d = 1327656212, sec_ld = 1327656212, sec_lld = 1327656212666
usec_d = 838745, usec_ld = 838745, usec_lld = 1327656212666
now_d = 338605759, now_ld = 511318374, now_ld = 1327656212838 （正确结果）

sizeof(int) = 4
sizeof(long) = 4
sizeof(long long) = 8