CMakelists.txt

add_library(node SHARED src/node.c)

target_link_libraries(nativelib? ${node})

============================================

note.h

#ifdef __cplusplus

extern "C" {

#endif

#ifndef TESTDEMO_NODE_H

#define TESTDEMO_NODE_H

#include <stdio.h>

#include <stdlib.h>

typedef struct Node {

? ? int data;

? ? struct Node *next;

? ? struct Node *previous;

} node_t;

typedef struct List {

? ? struct Node *head;

? ? struct Node *tail;

} list_t;

extern void list_init(list_t *list);

#endif //TESTDEMO_NODE_H

#ifdef __cplusplus

}

#endif

============================================

note.c

#include "node.h"

static node_t* creatNode(int data) {

? ? node_t *pnode = malloc(sizeof(node_t));

? ? pnode->data = data;

? ? pnode->previous = NULL;

? ? pnode->next = NULL;

? ? return pnode;

}

void list_init(list_t *list){

? ? list->head = creatNode(-1);

? ? list->tail = creatNode(-1);

? ? list->head->next = list->tail;

};

============================================

native-lib.cpp

#include <jni.h>

#include <string>

#include <assert.h>

#include <node.h>

extern "C" JNIEXPORT jstring JNICALL

Java_com_test_testdemo_MainActivity_stringFromJNI(JNIEnv* env, jobject /* this */) {

//? ? std::string hello = "Hello";

? ? char *str = "titles";

? ? list_t list;

? ? list_init(&list);

? ? return env->NewStringUTF(str);

}

============================================

錯誤

C/C++: ld.lld: error: undefined symbol: list_init

C++ build system [build] failed while executing:

? ? /Users/didi/Library/Android/sdk/cmake/3.22.1/bin/ninja \

? ? ? -C \

? ? ? /Users/didi/AndroidStudioProjects/TestDemo/app/.cxx/Debug/1j3s156k/arm64-v8a \

? ? ? nativelib \

? ? ? node

? from /Users/didi/AndroidStudioProjects/TestDemo/app

? ? ? ? at com.android.build.gradle.internal.cxx.process.ExecuteProcessKt.execute(ExecuteProcess.kt:274)

? ? ? ? at com.android.build.gradle.internal.cxx.process.ExecuteProcessKt$executeProcess$1.invoke(ExecuteProcess.kt:106)

? ? ? ? at com.android.build.gradle.internal.cxx.process.ExecuteProcessKt$executeProcess$1.invoke(ExecuteProcess.kt:104)

? ??

? ? ? ? ... 112 more

Caused by: com.android.ide.common.process.ProcessException: Error while executing process /Users/didi/Library/Android/sdk/cmake/3.22.1/bin/ninja with arguments {-C /Users/didi/AndroidStudioProjects/TestDemo/app/.cxx/Debug/1j3s156k/arm64-v8a nativelib node}

? ? ? ? at com.android.build.gradle.internal.process.GradleProcessResult.buildProcessException(GradleProcessResult.java:73)

? ? ? ? at com.android.build.gradle.internal.process.GradleProcessResult.assertNormalExitValue(GradleProcessResult.java:48)

? ? ? ? at com.android.build.gradle.internal.cxx.process.ExecuteProcessKt.execute(ExecuteProcess.kt:269)

? ? ? ? ... 129 more

Caused by: org.gradle.process.internal.ExecException: Process 'command '/Users/didi/Library/Android/sdk/cmake/3.22.1/bin/ninja'' finished with non-zero exit value 1

? ? ? ? at org.gradle.process.internal.DefaultExecHandle$ExecResultImpl.assertNormalExitValue(DefaultExecHandle.java:415)

? ? ? ? at com.android.build.gradle.internal.process.GradleProcessResult.assertNormalExitValue(GradleProcessResult.java:46)

? ? ? ? ... 130 more