Android - NDK:在Jni中打印Log信息

在Jni中打印Log信息

1、在配置CMakeLists.txt

find_library( # Sets the name of the path variable.log-lib# Specifies the name of the NDK library that# you want CMake to locate.log)# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.target_link_libraries( # Specifies the target library.ndktest# Links the target library to the log library# included in the NDK.${log-lib})

2、在jni层的cpp文件中定义

#include <android/log.h>#define LOG_TAG "MyJNILog"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG ,__VA_ARGS__) // 定义LOGI类型
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG ,__VA_ARGS__) // 定义LOGD类型
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,LOG_TAG ,__VA_ARGS__) // 定义LOGW类型
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG ,__VA_ARGS__) // 定义LOGE类型
#define LOGF(...) __android_log_print(ANDROID_LOG_FATAL,LOG_TAG ,__VA_ARGS__) // 定义LOGF类型

3、在jni中使用

LOGI("strPre = %s", buf);  // 输出字符串LOGI("in native , a = %f,b= %f", a, b);  // a和b为double类型或float类型LOGI("len1 = %d, len2 = %d", len1, len2);  // 输出int类型