Android - NDK:在Jni中打印Log信息

偶是老李头2024-09-14 18:55

在Jni中打印Log信息

1、在配置CMakeLists.txt

txt 复制代码

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

c 复制代码

#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

复制代码

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