Android studio 2.3.2上的JNI编译错误

Question

我正在制作应用程序，以广播电话视频到youtube频道。我找到了这个链接https://github.com/youtube/yt-watchme。

在编译我的代码时，我得到了错误

在文件avecode.h代码#include“libavutil/samplefmt.h”中找不到libavutil

错误：失败：生成失败，出现异常。*错误:
执行任务“：app:ExternalNativeBuildDebug”失败。
生成命令失败。
执行进程时出错

/users/nomankhan/library/android/sdk/cmake/3.6.4111459/bin/cmake带参数{--build/clients/ankur/jnidemo/app/.externalnativebuild/cmake/debug/mips64--target native-lib}
[1/2]构建CXX对象cmakefiles/native-lib.dir/src/main/cpp/native-lib.cpp.o
失败：ux-android--gcc-toolchain=/users/nomankhan/library/android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/darwin-x86_64-sysroot=/users/nomankhan/library/android/sdk/ndk-bundle/sysroot-dnative_lib_exports-i./.../.../.../.../src/main/cpp/include/libdec-i./.用户/nomankhan/library/android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include-isystem/users/nomankhan/library/android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/mips64/include-isystem/users/nomankhan/library/android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/backback-isystem/users/nomankhan/library/android/sdk/ndk-bundle/sysroot/usr/include/mips64el-linux-android-d__android_api__=21-g-dandroid-ffunction-sections-funwind-tables-fstack-no-canonical-prefixes-fintegrat-as-wa,-lib.dir/src/main/cpp/native-lib.cpp.o-Mf cmakefiles/native-lib.dir/src/main/cpp/native-lib.cpp.o.d-o cmakefiles/native-lib.dir/src/main/cpp/native-lib.cpp

在包含于/clients/ankur/jnidemo/app/src/main/cpp/native-lib.cpp:4:/clients/ankur/jnidemo/app/src/main/cpp/libavcodec/avcodec.h:31:10:致命错误：'libavutil/samplefmt.h'文件未找到#include“libavutil/samplefmt.h”^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

我的cmakelists.txt

 cmake_minimum_required(VERSION 3.4.1)

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 )

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 )


target_link_libraries( # Specifies the target library.
                       native-lib

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

include_directories(src/main/cpp/include/libavcodec)

include_directories(src/main/cpp/include/libavformat)

include_directories(src/main/cpp/include/libavutil)

Answer 1

下面的答案是假设cpp中的文件夹包含C++代码/src文件。如果没有，那么您可能有代码和库结构问题。

简单地调用include_directories不会得到cmake来编译它们，我相信这只会帮助IDE进行某些“语法突出显示”和编码相关的事情，但这很重要。

相反，您需要在add_library调用中包含代码文件。很明显，您有很多文件，这样的遍历代码将会有所帮助：

cmake_minimum_required(VERSION 3.4.1)

include_directories(src/main/cpp/include/libavcodec)        

# Traverses through the directories recursively 
# and append matching files to variable my_lib_SRC
file(GLOB_RECURSE my_lib_SRC
    "src/main/cpp/*.h"
    "src/main/cpp/*.cpp"
)

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).
         ${my_lib_SRC})

target_link_libraries( # Specifies the target library.
                       native-lib

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