debug訊息 in logcat

*.c

#include <android/log.h>

#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, "TAG", __VA_ARGS__);
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,    "TAG", __VA_ARGS__);
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,    "TAG", __VA_ARGS__);
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,   "TAG", __VA_ARGS__);
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,   "TAG", __VA_ARGS__);

Android.mk (for jni)

LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog

ref: jjunjoe的专栏