本文内容参考多位大神的截图和代码。只是总结一下，可以更快的配置好。

一. 配置环境安装 NDK。

  1.下载好ndk：下载地址 https://developer.android.com/ndk/downloads/index.html

  2. Android Studio里安装。菜单栏 Tools ----> SDK Manger ----> SDK TOOLS .查找 到NDK下载。

 

二. 打开AndroidStudio 新建一个类，声明native方法。这个类是java与C/C++交互的中介，方法由java声明，由C/C++实现。

三.打开android studio终端，使用javac编译上述文件，生成class文件。

   1.终端 cd myJNI类所在的目录

   2.使用javac编译上述文件. javac myJNI.java 生成 myJNI.class

   3.cd 到项目里的java目录。然后在java目录使用 javah -jni 包名.类名 命令生成.h头文件 然后就能看到生成了一个h文件。 注意一定要在java层目录下输入命令，不然不会报错：找不到xxx类  

四. 新建一个jni文件夹，新建test.c，把.h里面的内容复制进去，并实现里面的函数。

1. 新建一个jni文件夹

2.在jni文件夹下，新建test.c

3.把 ”javah -jni 包名.类名 命令生成.h头文件“ 生成的.文件放入jni文件夹下。并在test.c 实现它的方法。

4.接着在jni文件夹下新建Android.mk和Application.mk文件。

Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE := MyJni
LOCAL_SRC_FILES := Test.c
include $(BUILD_SHARED_LIBRARY)

Application.mk

APP_ABI := all

五. 使用CMake 。创建CMakeLists.txt文件

 1.在Project 目录下,右键app，点击新建File文件,命名为CMakeLists.txt

2.配置CMakeLists.txt

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
             MyJni #.so库名 可自定义

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             src/main/jni/test.c ) #源文件所在目录
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
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 )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
                       MyJni #.so库名 可自定义
                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib} )

    3.右键app，点击Link C++ Project with Gradle，选择path：刚才的CMakeLists.txt，它会在 App build 生成相应的代码。

 

六. make projext 大功告成。

七. so文件在本项目里的使用。

    app Module 在Android 节点下:

sourceSets {
    main() {
        jniLibs.srcDirs = ['src/main/libs']
        jni.srcDirs = [] //屏蔽掉默认的jni编译生成过程
    }
}