Android NDK 打印日志到Logcat

亦凉 2023-10-10 10:38 29阅读 0赞

##### 首先确保CmakeLists中已添加Log库 #####

通过Android Studio 新建NDK项目后，需要确保`CmakeLists.txt`已添加Log库

# 从系统库中查找依赖库
    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)
    
    # 配置库的依赖关系
    target_link_libraries( # Specifies the target library.
            native-lib
    
            # Links the target library to the log library
            # included in the NDK.
            ${
        log-lib})

#### 然后在cpp文件中引入Log库 ####

#include <android/log.h>
    //定义输出的TAG
    const char * LOG_TAG = "LOG_TGA";
    
    #define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
    #define LOGT(...) __android_log_print(ANDROID_LOG_INFO,"alert",__VA_ARGS__)
    #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
    #define LOGW(...) __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
    #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)

然后使用即可

extern "C" JNIEXPORT jstring JNICALL
    Java_com_heiko_ndklogtest_MainActivity_stringFromJNI(
            JNIEnv *env,
            jobject /* this */) {
        
        std::string hello = "Hello from C++";
    
        LOGI("打印了日志........");
        LOGD("hello:%s", hello.c_str());
    
        return env->NewStringUTF(hello.c_str());
    }

输出结果如下

I/LOG_TGA: 打印了日志........
    D/LOG_TGA: hello:Hello from C++

#### 参考 ####

[https://blog.csdn.net/weixin\_33779515/article/details/88037942][https_blog.csdn.net_weixin_33779515_article_details_88037942]

[https_blog.csdn.net_weixin_33779515_article_details_88037942]: https://blog.csdn.net/weixin_33779515/article/details/88037942