Android NDK(CMake) 报错信息：error: undefined reference to ‘__android_log_print‘

视频课程：Java与JNI基础数据类型转换，Android CMake以及NDK实践基础教程-慕课网

上代码：base.h

#include <android/log.h>
#include <jni.h>
#ifndef MY_APPLICATION_BASE_H
#define MY_APPLICATION_BASE_H
#define LOG_TAG "NativeMethod"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
#define LOGW(...) __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
#endif //ANDROIDCPPSOLIB_LOGUTIL_H

jni_basic_type.cpp

#include <jni.h>
#include <string>
#include "base.h"


extern "C"
JNIEXPORT jint JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeInt(JNIEnv *env, jobject thiz,
                                             jint num) {
    LOGD("JAVA int value is %d", num);
    int c_num = num * 2;
    return c_num;
}

extern "C"
JNIEXPORT jbyte JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeByte(JNIEnv *env, jobject thiz,
                                              jbyte b) {
    LOGD("java byte value is %d", b);
    jbyte
            c_byte = b + (jbyte)
            10;
    return c_byte;
}

extern "C"
JNIEXPORT jchar JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeChar(JNIEnv *env, jobject thiz,
                                              jchar ch) {

    LOGD("java char value is %c", ch);
    jchar
            c_char = ch + (jchar)
            3;
    return c_char;
}



extern "C"
JNIEXPORT jshort JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeShort(JNIEnv *env, jobject thiz,
                                               jshort sh) {
    LOGD("java char value is %d", sh);
    jshort
            c_short = sh + (jshort)
            10;
    return c_short;
}


extern "C"
JNIEXPORT jlong JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeLong(JNIEnv *env, jobject thiz,
                                              jlong l) {
    LOGD("java long value is %ld", l);
    jlong c_long = l + 100;
    return c_long;
}


extern "C"
JNIEXPORT jfloat JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeFloat(JNIEnv *env, jobject thiz,
                                               jfloat f) {
    LOGD("java float value is %f", f);
    jfloat
            c_float = f + (jfloat)
            10.0;
    return c_float;
}


extern "C"
JNIEXPORT jdouble JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeDouble(JNIEnv *env, jobject thiz,
                                                jdouble d) {
    LOGD("java double value is %f", d);
    jdouble c_double = d + 20.0;
    return c_double;
}

extern "C"
JNIEXPORT jboolean JNICALL
Java_com_jszy_jni_JNIBasicType_callNativeBoolean(JNIEnv *env, jobject thiz,
                                                 jboolean value) {
    LOGD("java boolean value is %d", value);
    jboolean
            c_bool = (jboolean)
            !value;
    return c_bool;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.10.2)
project("cmakedemo")
#静态
add_library(
        cmakedemo
        SHARED
        native-lib.cpp)

#与‘cmakedemo’链接在一起
add_library(
        people-lib
        SHARED
        people/people.cpp)

#动态注册
add_library(
        native-lib
        SHARED

        jni/jni_dynamic_load.cpp
        jni/jni_basic_type.cpp
)
add_library(base-lib
        SHARED
        base/base.cpp
        base/jvm.cpp
        )
#添加搜索路径
include_directories(${CMAKE_CURRENT_LIST_DIR}/people/)
include_directories(${CMAKE_CURRENT_LIST_DIR}/base/)

#查找动态库
find_library(
        log-lib
        log)

#动态库关联
target_link_libraries(
        cmakedemo
        people-lib
        ${log-lib})

target_link_libraries(
        native-lib
        base-lib
        ${log-lib})

关键问题解决： 我把动态关联库分开写就解决了这个问题

由原来的：

#动态库关联
target_link_libraries(
        cmakedemo
        people-lib
        native-lib
        base-lib
        ${log-lib})

修改为：

#动态库关联
target_link_libraries(
        cmakedemo
        people-lib
        ${log-lib})

target_link_libraries(
        native-lib
        base-lib
        ${log-lib})

就可以,虽然解决了，但是不明白为什么这样...  难道关联太多了....

我明明在jni_basic_type.cpp中引入了#include "base.h" 使用LOGD 也没有报错...但是就是编译不过。反正问题解决了。

运行结果：确实按到程序逻辑运行了

2021-10-15 14:03:33.818 9808-9808/com.jszy.cmakedemo D/NativeMethod: JAVA int value is 100
2021-10-15 14:03:33.858 9808-9808/com.jszy.cmakedemo I/MainActivity:  
    ┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────
    │ main, com.jszy.cmakedemo.MainActivity.lambda$onCreate$1(MainActivity.java:38)
    ├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
    │ java show 200
    └────────────────────────────────────────────────────────────────────────────────────────────────────────────────

参考：Android ndk(cmake): 'undefined reference to `__android_log_write' when using log api in the second jni library - Stack Overflow

 吐槽一下，其他博文大多数是基于Android.mk的  没得参考意义，10个博文9个一样...还没实际解决问题..恼火！！！！！！！！！！