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ndk调用c++动态库

fulincao on Nov 15, 20212021-11-15T00:00:00+08:00
Updated Jul 20, 20222022-07-20T18:07:34+08:00 2 min read

cmake ndk 交叉编译

  1. 从官网下载ndk

  2. 生成独立的ndk工具链

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     ## 生成arm64版本的
 ./build/tools/make_standalone_toolchain.sh \
 --arch arm64 \
 --install-dir=alone-sdk

  3. cmake 配置

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     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIE")
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fPIE -pie")

 # 配置使用 NDK Standalone Toolchain 编译
 set(NDK_STANDALONE_TOOLCHAIN /home/cao/Android/Sdk/ndk/21.3.6528147/alone-sdk)
 # set(CMAKE_SYSTEM_NAME AndroidARM)
 # set(CMAKE_SYSTEM_VERSION 3)
 set(CMAKE_C_COMPILER ${NDK_STANDALONE_TOOLCHAIN}/bin/aarch64-linux-android-gcc)
 set(CMAKE_CXX_COMPILER ${NDK_STANDALONE_TOOLCHAIN}/bin/aarch64-linux-android-g++)
 # set(CMAKE_FIND_ROOT_PATH ${NDK_STANDALONE_TOOLCHAIN})

 set (CMAKE_ANDROID_ARCH_ABI arm64-v8a)

 # set (CMAKE_ANDROID_STANDALONE_TOOLCHAIN ~/ndk_toolchain)
 # 使用 NDK 提供的头文件
 add_definitions("--sysroot=${NDK_STANDALONE_TOOLCHAIN}/sysroot")
  4. android引入so

    • 将生成的.so放到src/main/jniLibs/arm64-v8a/,并将.h复制到默认的src/main/cpp

    • 配置CMakeLists

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     add_library(dds SHARED IMPORTED)

 #设置so路劲  ${CMAKE_SOURCE_DIR}是CMakeLists.txt的路径   ${ANDROID_ABI} 标识cpu类型
 set_target_properties(dds PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../jniLibs/${ANDROID_ABI}/libdds.so)
 set_property(TARGET dds PROPERTY IMPORTED_NO_SONAME 1)

 # 链接dds库
 target_link_libraries( # Specifies the target library.
     native-lib
     dds
     flow_stream
     # Links the target library to the log library
     # included in the NDK.
     ${log-lib})
    • 配置app/build.gradle
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     ## defaultConfig下配置
 externalNativeBuild {
     cmake {
         cppFlags ""
         arguments "-DANDROID_STL=c++_shared"
     }
 }

 ndk {
     # 这里只配置 arm64-v8a,因为只生成了这个版本的库
     abiFilters 'arm64-v8a'
 }


 ## android 标签下配置
 splits {
     abi {
         enable true
         reset()
         include 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a' //select ABIs to build APKs for
         universalApk true //generate an additional APK that contains all the ABIs
     }
 }
 # map for the version code
 project.ext.versionCodes = ['armeabi': 1, 'armeabi-v7a': 2, 'arm64-v8a': 3, 'mips': 5, 'mips64': 6, 'x86': 8, 'x86_64': 9]
 android.applicationVariants.all { variant ->
     // assign different version code for each output
     variant.outputs.each { output ->
         output.versionCodeOverride =
                 project.ext.versionCodes.get(output.getFilter(com.android.build.OutputFile.ABI), 0) * 1000000 + android.defaultConfig.versionCode
     }
 }
  5. android使用
Android
ndk
This post is licensed under CC BY 4.0 by the author.
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