NDK开发心得记录

最新推荐文章于 2022-04-25 14:32:09 发布

四个木

最新推荐文章于 2022-04-25 14:32:09 发布

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分类专栏：学习

本文链接：https://blog.youkuaiyun.com/huangcl_0416/article/details/87782346

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本文主要记录在NDK开发过程中的一些坑及注意事项，本文将持续更新。

1、开发准备

ndk开发首要需要下载ndk，并在android studio中设置，如下图：

这里需要注意，as自动下载的ndk版本一般会出现不全或版本不兼容问题，建议自行前往官网下载。下载地址

2、cmake开发

ndk开发方式有两种，一种是传统的通过编写Android.mk文件方式这里就不再述说的，网上有很多介绍，且已经过时。本文主要介绍通过cmake开发ndk。

2.1 cmakelist文件解释

# 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) //cmake最低版本，如果CMake的当前版本低于指定的版本，它会停止处理工程文件，并报告错误

# 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.
file(GLOB native-src "src/main/cpp/*.cpp") //设置一个全局变量native-src  指向这个下所有.cpp文件

add_library( # Sets the name of the library.
             native-lib //lib库名称，在java中引入时使用

             # Sets the library as a shared library.
             SHARED //加载方式

             # Provides a relative path to your source file(s).
             ${native-src} //lib路径
             )


include_directories(   //添加额外的.h头文件
    src/main/cpp/h
)
# 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.
                       native-lib

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