在Jni中打印Log信息
1、在配置CMakeLists.txt
txt
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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
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#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