在 cmakelists.txt android 中添加 opencv答案

【问题标题】：add opencv in cmakelists.txt android在 cmakelists.txt android 中添加 opencv
【发布时间】：2017-05-01 01:57:12
【问题描述】：

我正在使用本机代码并使用 ndk-build 在 android studio 项目中打开 cv，但我想使用 cmake。请告诉我如何在 cmakelists.txt 文件中设置这些东西。这是我的 Android.mk 文件

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

OpenCV_INSTALL_MODULES:=on
OPENCV_CAMERA_MODULES:=off
OPENCV_LIB_TYPE:=STATIC

ifeq ("$(wildcard $(OPENCV_MK_PATH))","")
include D:/OpenCV-3.1.0-android-sdk/sdk/native/jni/OpenCV.mk
else
include $(OPENCV_MK_PATH)
endif

LOCAL_MODULE := module_name

LOCAL_CFLAGS := -DANDROID_NDK \
                -DDISABLE_IMPORTGL

LOCAL_SRC_FILES := src/main/cpp/test.cpp

LOCAL_LDLIBS    += -lm -llog -ljnigraphics
include $(BUILD_SHARED_LIBRARY)

如何在cmake中设置这些东西

【问题讨论】：

标签： opencv android-studio android-ndk cmake ndk-build

【解决方案1】：

为时已晚，但有人可能会发现它很有用。首先将 opencv 2 的 libopencv_java.so 或 oepncv3 的 libopencv_java3.so 放在不同架构下的 app/src/main/jniLibs 文件夹中，如果您也有 linonfree.so 则将其添加到 jniLibs 文件夹中。将 cmake 链接到 gradle。
这是 CmakeLists。

    cmake_minimum_required(VERSION 3.4.1)
       set(EXECUTABLE_OUTPUT_PATH      "${CMAKE_CURRENT_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}")
    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 )
 #the nonfree optional if you have build the nonfree.so of the xfeature2d module    
add_library( # Sets the name of the library 
             nonfree
             # Sets the library as shared library.
             SHARED
             # indicate the library is prebuilt.
             IMPORTED )
set_target_properties( # Specifies the targeted library.
                         nonfree
                       # Specifies the parameter you want to define.
                          PROPERTIES IMPORTED_LOCATION
                        # Specifies the location of the library.
                         ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libnonfree.so )
    include_directories(C:/Users/what/Documents/OpenCV-android-sdk/sdk/native/jni/include)
    add_library( lib-opencv SHARED IMPORTED )
    set_target_properties(lib-opencv PROPERTIES IMPORTED_LOCATION  ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libopencv_java3.so)
    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
                           # prebuilt library nonfree.
                           nonfree
                           # prebuilt library opencv java.
                           lib-opencv
                           # Links the target library to the log library
                           # included in the NDK.
                           ${log-lib} )

在 build.gradle(app) 中设置 jniLis.srcDirs 文件夹路径。

sourceSets {
    main {
        // let gradle pack the shared library into apk
        jniLibs.srcDirs = ['src/main/jniLibs']
    }
    }

【讨论】：