引入so文件CmakeList 配置

作者: 猪_队友 | 来源:发表于2018-04-20 08:02 被阅读77次

    做NDK开发的时候,很大程度的是引用成熟类库,我们做逻辑,功能,那么怎么把so文件引入到我们的android工程里面的?
    目前AndroidStudio2.2之后官方推荐的是Cmake,之前是Android.mk构建文件,大概类似,我们在只讲解一下Cmake,知识总是要及时更新才是。
    通常我们默认编写的时候他会自动书写Cmake

    #将指定的源文件生成链接文件,然后添加到工程中去
    add_library(
    #设置lib的名字
                 native-lib
    #设置lib的类型 共享型  还有STATIC、和MODULE
                 SHARED
     #源码的相对路径
                  src/main/cpp/native-lib.cpp
              )
    #这个地方是 系统已经集成了很多lib,然后需要find以下 作为声明,表示你要用这些lib
    find_library(
    #自己起一个 lib的名称
                  log-lib
    
     #lib的文件名
                  log )
    
    #将目标文件与库文件进行链接
    target_link_libraries( # Specifies the target library.
                           native-lib
                           # Links the target library to the log library
                           # included in the NDK.
                           ${log-lib} )
    

    这是系统根据我们写的C/C++文件生成的,但是我们要加入第三方so怎么配置呢?我就用FFmpeg和Libyuv.so来演示一下。
    首先最大的不同是:
    需要声明一下文件的基地址,这个后面地址的时候需要用到

    set(distribution_DIR ../../../../libs)
    

    然后

    #添加lib,SHARED类型,是IMPORTED 引入的库
    add_library( libyuv
                 SHARED
                 IMPORTED)
    #设置 库的属性   里面是名称 ,属性:引入地址把我们的真实地址填写进去
    set_target_properties( libyuv
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libyuv.so)
    
    

    最后

    target_link_libraries( 
                           native-lib
    #指定链接库
                           libyuv
                           # Links the target library to the log library
                           # included in the NDK.
                           ${log-lib} )
    

    这是ffmpeg和libyuv的配置

    # 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.
                 native-lib
    
                 # Sets the library as a shared library.
                 SHARED
    
                 # Provides a relative path to your source file(s).
                  src/main/cpp/native-lib.cpp
                 src/main/cpp/mylo.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.
    
    
    
    set(distribution_DIR ../../../../libs)
    add_library( libyuv
                 SHARED
                 IMPORTED)
    set_target_properties( libyuv
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libyuv.so)
    
    add_library( avcodec
                 SHARED
                 IMPORTED)
    set_target_properties( avcodec
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libavcodec.so)
    
    add_library( avfilter
                 SHARED
                 IMPORTED)
    set_target_properties( avfilter
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libavfilter.so)
    
    add_library( avformat
                 SHARED
                 IMPORTED)
    set_target_properties( avformat
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libavformat.so)
    
    add_library( avutil
                 SHARED
                 IMPORTED)
    set_target_properties( avutil
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libavutil.so)
    
    add_library( swresample
                 SHARED
                 IMPORTED)
    set_target_properties( swresample
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libswresample.so)
    
    add_library( swscale
                 SHARED
                 IMPORTED)
    set_target_properties( swscale
                           PROPERTIES IMPORTED_LOCATION
                           ${distribution_DIR}/armeabi-v7a/libswscale.so)
    
    include_directories(libs/include)
    
    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 )
                  find_library( # Sets the name of the path variable.
                                android-lib
    
                                # Specifies the name of the NDK library that
                                # you want CMake to locate.
                                android )
    
    # 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
                           libyuv
                           avcodec
                           avfilter
                           avformat
                           avutil
                           swresample
                           swscale
                           # Links the target library to the log library
                           # included in the NDK.
                           ${log-lib}
                             ${android-lib})
    

    最后的最后不要忘记在build.gradle(app)中配置

     externalNativeBuild {
                cmake {
                    cppFlags "-frtti -fexceptions"
                }
            }
            ndk {
                //选择要添加的对应cpu类型的.so库。
                abiFilters 'armeabi-v7a'
                // 还可以添加 'x86', 'x86_64', 'mips', 'mips64'
            }
    

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