原文:
http://www.jianshu.com/p/e689d0196a17
1.配置Anroid Studio(这步是关键)
使用[command+,] 打开Preferences,选择External Tools,点击加号框如下图:
![](http://upload-images.jianshu.io/upload_images/1226849-fc511b1906b58971.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
点击+号之后,打开Macros 配置宏命令界面,如下图:
![](http://upload-images.jianshu.io/upload_images/1226849-ef87cb38f9355763.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](http://upload-images.jianshu.io/upload_images/1226849-d6f1b53049572330.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](http://upload-images.jianshu.io/upload_images/1226849-8f93effb6ea3e835.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](http://upload-images.jianshu.io/upload_images/1226849-22d1c5f5c8d072b6.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![](http://upload-images.jianshu.io/upload_images/1226849-152b7662911c49a6.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
2.配置完成就可以使用javah 、ndk-build、ndk-build clean这三个命令了,那么在哪里使用这些命令,请看下图
![](http://upload-images.jianshu.io/upload_images/1226849-13747f6eedf18067.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
3.配置完成,我们开始新建工程MyNdk,然后新建jni目录
![](http://upload-images.jianshu.io/upload_images/1226849-cf21dea66559c79e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
4.修改app下的build.gradle文件, 如下图
ndk{ moduleName "MyLibrary" } sourceSets.main{ jni.srcDirs = [] jniLibs.srcDir "src/main/libs" }
![](http://upload-images.jianshu.io/upload_images/1226849-1a6c6770b10760b0.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
5.修改MyNdk下的gradle.properties文件(如果没有此文件,自己新建一个),如下图
android.useDeprecatedNdk=true
![](http://upload-images.jianshu.io/upload_images/1226849-cba9bf78ef1170e1.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
6.新建MyNdk.java
public class MyNdk { static { System.loadLibrary("MyLibrary"); } public native String getString(); }
![](http://upload-images.jianshu.io/upload_images/1226849-8eb260ef71ceac1e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
7.这步开始创建头文件,操作如下图(注意在MyNdk.java文件上点击右键)
![](http://upload-images.jianshu.io/upload_images/1226849-f51068ce1b59c9ca.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
8.执行完成后jni目录下就创建了com_zhangyp_higo_myndk_MyNdk.h文件,然后我们在jni目录下编写 MyLibrary.cpp、Android.mk、Application.mk这三个文件,代码如下:
![](http://upload-images.jianshu.io/upload_images/1226849-ee869405e5ea0080.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
com_zhangyp_higo_myndk_MyNdk.h
/* DO NOT EDIT THIS FILE - it is machine generated */ #include <jni.h> /* Header for class com_zhangyp_higo_myndk_MyNdk */ #ifndef _Included_com_zhangyp_higo_myndk_MyNdk #define _Included_com_zhangyp_higo_myndk_MyNdk #ifdef __cplusplus extern "C" { #endif /* * Class: com_zhangyp_higo_myndk_MyNdk * Method: getString * Signature: ()Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_com_zhangyp_higo_myndk_MyNdk_getString (JNIEnv *, jobject); #ifdef __cplusplus } #endif #endif
MyLibrary.cpp
#include "com_zhangyp_higo_myndk_MyNdk.h" JNIEXPORT jstring JNICALL Java_com_zhangyp_higo_myndk_MyNdk_getString (JNIEnv * env, jobject obj){ return (*env).NewStringUTF("This is mylibrary !!!"); }
Android.mk
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := MyLibrary LOCAL_SRC_FILES =: MyLibrary.cpp include $(BUILD_SHARED_LIBRARY)
Application.mk
APP_MODULES := MyLibrary APP_ABI := all
9.如何执行ndk-build,请看下图:(注意在jni目录上点击右键)
![](http://upload-images.jianshu.io/upload_images/1226849-4e2c072cc0e99fea.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
10.得到so文件,如下图
![](http://upload-images.jianshu.io/upload_images/1226849-4b0c5acf62455472.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
12.在MainActivity中调用,代码如下
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView tv = (TextView) findViewById(R.id.tv); tv.setText(new MyNdk().getString()); } }
12.大功告成,可以运行了,oh yet!
如果在执行javah命令时报xxx未找到,可能是没有生成相应的class文件,编译一下就好了