1.新建项目，不勾选 include c++ support

2.新建一个类JniTest，并添加native方法

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3.工具配置网上有

image

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

extern "C"
JNIEXPORT jstring JNICALL
Java_com_weilong_lw_myjni2_JniTest_getHellow(JNIEnv *env,jobject /* this */) {
       std::string hello = "Hello from C++";
       return env->NewStringUTF(hello.c_str());
}

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具体配置看官方文档

# 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.
             sayHello

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             src/main/jni/say.cpp)

# 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.
                       sayHello

                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib} )

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externalNativeBuild {
            cmake {
                cppFlags "-std=c++11 -D__CORRECT_ISO_CPP_WCHAR_H_PROTO"
            }
//            ndk {
//                abiFilters "armeabi", "armeabi-v7a"
//            }
        }


externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }

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10.简单的方法：新建一个勾选 include c++ support的项目，将其中的文件拷贝到自己项目中