在Android studio 3.2 版项目中使用cmake调用C/C++

本文操作环境:

win10/Android studio 3.2

1.环境配置

在SDK Tools里选择 CMAKE/LLDB/NDK点击OK 安装这些插件.

2.创建CMakeLists.txt文件

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

点击OK，创建完毕!

3.配置文件

在CMakeLists.txt文件里添加如下代码（具体含义自行百度）:

# 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.
             test_lib #.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_lib.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.
                       test_lib #.so库名 可自定义

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

4.创建一个新的java类

在此类中添加代码

package com.example.administrator;

public class Test_lib {
    static {
        System.loadLibrary("test_lib");//加载.so库
    }

    public static native String getStr(String str);//调用C/C++接口函数
}