Android NDK 打印日誌到Logcat

首先確保CmakeLists中已添加Log庫

通過Android Studio 新建NDK項目後，需要確保CmakeLists.txt已添加Log庫

# 從系統庫中查找依賴庫
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)

# 配置庫的依賴關係
target_link_libraries( # Specifies the target library.
        native-lib

        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

然後在cpp文件中引入Log庫

#include <android/log.h>
//定義輸出的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__)

然後使用即可

extern "C" JNIEXPORT jstring JNICALL
Java_com_heiko_ndklogtest_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";

    LOGI("打印了日誌........");
    LOGD("hello:%s", hello.c_str());

    return env->NewStringUTF(hello.c_str());
}

輸出結果如下

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

參考

https://blog.csdn.net/weixin_33779515/article/details/88037942