Android Technology 9:android NDK log debugging

In Android we often use log to debug programs, and the NDK also provides us with a way to output logs.

1. Introduction of header Files <android/log.h>

#include <android/log.h>

2. Defining macros

#define LOG_TAG "System.out.c"
#define LOGD (...) _android_log_print (ANDROID_LOG_DEBUG,LOG_TAG,_VA_ARGS_)
#define Logi (...) _android_log_print (ANDROID_LOG_INFO,LOG_TAG,_VA_ARGS_)

Introduction of third-party libraries in 3.ANDROID.MK

Local_ldlibs + =-llog

-L indicates introduction of library log library name

Using Logd,logi in a 4.C program

Logi ("C LANGUAGE METHOD START");