Android Studio 2.2 doesn't package third party library to apk
<p>I use Android Studio 2.2's <code>cmake</code> to build native code, in the native code I invoked the ffmpeg api, so the ffmpeg library should be packaged. My <code>CMakelists.txt</code> is as below:</p>

<pre><code>cmake_minimum_required(VERSION 3.4.1)
include_directories(libs/arm/include)
link_directories(libs/arm/lib/)

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).
             # Associated headers in the same location as their source
             # file are automatically included.
             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} )
add_library(avcodec-57 SHARED IMPORTED)
set_target_properties(avcodec-57 PROPERTIES IMPORTED_LOCATION C:/Users/tony/Desktop/MyApplication/app/libs/arm/lib/libavcodec-57.so)
target_link_libraries(native-lib avcodec-57)
target_link_libraries(native-lib avformat-57)

target_link_libraries(native-lib avutil-55)
target_link_libraries(native-lib avfilter-6)
</code></pre>

<p>In such case, I can make project successfully, but when I install the apk to emulator and run, it failed and show that "libavcodec-57.so" isn't found.
Then I use tool (analyze apk) to check the apk, found that the ffmpeg library isn't packaged.</p>