Android已有工程支持c++ 使用CMake

Android 已有项目添加c++支持
1、右键module新建CMakeLists.txt
2.module中build.gradle配置文件中在

  android{     defaultConfig {         externalNativeBuild {            cmake {                cppFlags ""            }        }        ndk {//编译在哪个CPU平台上            abiFilters 'armeabi-v7a'        }      sourceSets.main {//外部so文件路径            jniLibs.srcDir 'libs'        }    }    externalNativeBuild {        // Encapsulates your CMake build configurations.        cmake {            // Provides a relative path to your CMake build script.            path "CMakeLists.txt"        }        }}

3、CMakeLists.txt文件编写规则

cmake_minimum_required(VERSION 3.4.1)add_library( # 为library起名字             native-lib             # 设置为SHARE类型，STATIC为需要加载.a文件             SHARED             # 需要编译的源代码文件目录             src/main/cpp/native-lib.cpp )add_library( avcodec-57# 为library起名字             SHARED             IMPORTED ) # 不需要编译，由外部导入set_target_properties( avcodec-57                       PROPERTIES IMPORTED_LOCATION                       ../../../../libs/armeabi-v7a/libavcodec-57.so )//配置导入文件的路径add_library( avfilter-6             SHARED             IMPORTED )set_target_properties( avfilter-6                       PROPERTIES IMPORTED_LOCATION                       ../../../../libs/armeabi-v7a/libavfilter-6.so )add_library( avformat-57             SHARED             IMPORTED )set_target_properties( avformat-57                       PROPERTIES IMPORTED_LOCATION                       ../../../../libs/armeabi-v7a/libavformat-57.so )add_library( avutil-55             SHARED             IMPORTED )set_target_properties( avutil-55                       PROPERTIES IMPORTED_LOCATION                       ../../../../libs/armeabi-v7a/libavutil-55.so )add_library( swresample-2             SHARED             IMPORTED )set_target_properties( swresample-2                       PROPERTIES IMPORTED_LOCATION                       ../../../../libs/armeabi-v7a/libswresample-2.so )add_library( swscale-4             SHARED             IMPORTED )set_target_properties( swscale-4                       PROPERTIES IMPORTED_LOCATION                       ../../../../libs/armeabi-v7a/libswscale-4.so )include_directories( libs/include )#外部库需要的头文件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 )//加载NDK上的library# 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.#将需要的库文件进行链接target_link_libraries( # Specifies the target library.                       native-lib                       avcodec-57                       avfilter-6                       avformat-57                       avutil-55                       swresample-2                       swscale-4                       # Links the target library to the log library                       # included in the NDK.                       ${log-lib} )