android - 如何使用 Cmake 将 Android 项目与 libandroid 链接起来？

Question

所以，我有一个支持 C++ 的 android 项目。在尝试构建 C++ 代码时，我的项目中有一些 undefined reference ，在回答了我的第一个问题后，这里有什么问题 link ，我找不到办法。

Answer 1

如果你有看起来像这样的 Cmake:

cmake_minimum_required(VERSION 3.4.1)

# OpenCV stuff
include_directories(D:\\opencv-3.2.0-android-sdk\\OpenCV-android-sdk\\sdk\\native\\jni\\include)
add_library( lib_opencv SHARED IMPORTED )
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libopencv_java3.so)
add_compile_options(-std=c++11)

# 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)

# 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.

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 )

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in the
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
                       native-lib
                       -ljnigraphics
                       lib_opencv

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

只需将部分改成这样:

target_link_libraries( # Specifies the target library.
                       native-lib
                       -ljnigraphics
                       -landroid # Add this.
                       lib_opencv

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