记录一下Android Studio下NDK开发

1.新建工程，创建JNI调用的JAVA类，



public class JNIKey {
    static {
        System.loadLibrary("KeyJNI");
    }
    public native String getJNIKey();
}

2.编译项目，生成JNI调用类的字节码文件，为后续生成头文件做准备

3.从Terminal终端敲命令进入app\src\main目录，键入javah -d jni -classpath D:\Android\android-sdk-windows\platforms\android-23\android.jar;../../build/intermediates/classes/debug com.jni.key.JNIKey 命令生成头文件com_jni_key_JNIKey.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_jni_key_JNIKey */

#ifndef _Included_com_jni_key_JNIKey
#define _Included_com_jni_key_JNIKey
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_jni_key_JNIKey
 * Method:    getJNIKey
 * Signature: ()Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_com_jni_key_JNIKey_getJNIKey
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

4.创建C主文件main.c,实现头文件中的方法

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_jni_key_JNIKey */

#ifndef _Included_com_jni_key_JNIKey
#define _Included_com_jni_key_JNIKey
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_jni_key_JNIKey
 * Method:    getJNIKey
 * Signature: ()Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_com_jni_key_JNIKey_getJNIKey
        (JNIEnv *env, jobject obj) {
    return env->NewStringUTF("jfshdgg-ylifefre");
}

#ifdef __cplusplus
}
#endif
#endif

5.在local.properties中配置NDK路径：

ndk.dir=D\:\\Android\\android-ndk-r11c

在gradle.properties：

android.useDeprecatedNdk=true

在build.gradle：