我正尝试按照 http://code.opencv.org/projects/opencv/wiki/Trunk_OpenCV_for_Android 上的教程进行操作从源代码为 Android 构建 OpenCV 3.2.0。这是因为最终我想自定义构建，但现在我满足于自己构建它。
根据教程，我正在运行以下命令，这些命令似乎已成功完成:
export ANDROID_NDK=~/my-android-ndk
export ANDROID_STANDALONE_TOOLCHAIN=~/my-android-toolchain
cd opencv/platforms
sh ./scripts/cmake_android_arm.sh
cd build_android_arm
make -j8
当我检查 build_android_arm 目录时，我看到了很多东西，包括我期望的所有 .a 文件。但是似乎缺少一个文件:libopencv_java.so，它是由 openCV 静态库管理器加载的实际库(我无法使用动态库管理器)。该文件存在于 Android 示例中，手动复制到我的项目中确实有效。但我希望能够自己构建此文件!
我自己尝试过各种 CMake 设置，但有数千种可能的选项组合，我不确定从哪里开始。
我错过了什么？
shell 脚本的输出:
CMake Deprecation Warning at /Applications/CMake.app/Contents/share/cmake-3.8/Modules/CMakeForceCompiler.cmake:83 (message):
The CMAKE_FORCE_CXX_COMPILER macro is deprecated. Instead just set
CMAKE_CXX_COMPILER and allow CMake to identify the compiler.
Call Stack (most recent call first):
/Users/me/AndroidStudioProjects/opencv-3.2.0/platforms/android/android.toolchain.cmake:1166 (CMAKE_FORCE_CXX_COMPILER)
/Users/me/AndroidStudioProjects/opencv-3.2.0/platforms/build_android_arm/CMakeFiles/3.8.2/CMakeSystem.cmake:6 (include)
/Users/me/AndroidStudioProjects/opencv-3.2.0/platforms/build_android_arm/CMakeFiles/CMakeTmp/CMakeLists.txt:3 (project)
-- Performing Test C_HAS_MFPU_NEON - Success
-- Assume that non-module dependency is available: z (for module opencv_core)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-15-puzzle will not be build
Call Stack (most recent call first):
samples/android/15-puzzle/CMakeLists.txt:3 (add_android_project)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-face-detection will not be build
Call Stack (most recent call first):
samples/android/face-detection/CMakeLists.txt:9 (add_android_project)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-image-manipulations will not be build
Call Stack (most recent call first):
samples/android/image-manipulations/CMakeLists.txt:3 (add_android_project)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-camera-calibration will not be build
Call Stack (most recent call first):
samples/android/camera-calibration/CMakeLists.txt:3 (add_android_project)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-color-blob-detection will not be build
Call Stack (most recent call first):
samples/android/color-blob-detection/CMakeLists.txt:3 (add_android_project)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-tutorial-1-camerapreview will not be build
Call Stack (most recent call first):
samples/android/tutorial-1-camerapreview/CMakeLists.txt:3 (add_android_project)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-tutorial-2-mixedprocessing will not be build
Call Stack (most recent call first):
samples/android/tutorial-2-mixedprocessing/CMakeLists.txt:9 (add_android_project)
CMake Warning at cmake/OpenCVDetectAndroidSDK.cmake:205 (message):
Can not find any SDK target compatible with: 9 11
The project example-tutorial-3-cameracontrol will not be build
Call Stack (most recent call first):
samples/android/tutorial-3-cameracontrol/CMakeLists.txt:3 (add_android_project)
-- Sample example-tutorial-4-opencl is disabled, because ANDROID_OPENCL_SDK is not specified
--
-- General configuration for OpenCV 3.2.0 =====================================
-- Version control: unknown
--
-- Platform:
-- Timestamp: 2017-06-16T18:53:59Z
-- Host: Darwin 16.6.0 x86_64
-- Target: Android 1 armv7-a
-- CMake: 3.8.2
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: Release
--
-- C/C++:
-- Built as dynamic libs?: NO
-- C++ Compiler: /Users/me/AndroidStudioProjects/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++ (ver 4.9)
-- C++ flags (Release): -fexceptions -frtti -fpic -Wno-psabi --sysroot=/Users/me/AndroidStudioProjects/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fdata-sections -ffunction-sections -Wa,--noexecstack -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -fomit-frame-pointer -mfp16-format=ieee -fvisibility=hidden -fvisibility-inlines-hidden -mthumb -fomit-frame-pointer -fno-strict-aliasing -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fexceptions -frtti -fpic -Wno-psabi --sysroot=/Users/me/AndroidStudioProjects/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fdata-sections -ffunction-sections -Wa,--noexecstack -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -fomit-frame-pointer -mfp16-format=ieee -fvisibility=hidden -fvisibility-inlines-hidden -marm -fno-omit-frame-pointer -fno-strict-aliasing -O0 -g -DDEBUG -D_DEBUG -O0 -DDEBUG -D_DEBUG
-- C Compiler: /Users/me/AndroidStudioProjects/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc
-- C flags (Release): -fexceptions -fpic -Wno-psabi --sysroot=/Users/me/AndroidStudioProjects/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fdata-sections -ffunction-sections -Wa,--noexecstack -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-comment -fdiagnostics-show-option -fomit-frame-pointer -mfp16-format=ieee -fvisibility=hidden -mthumb -fomit-frame-pointer -fno-strict-aliasing -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fexceptions -fpic -Wno-psabi --sysroot=/Users/me/AndroidStudioProjects/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fdata-sections -ffunction-sections -Wa,--noexecstack -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-comment -fdiagnostics-show-option -fomit-frame-pointer -mfp16-format=ieee -fvisibility=hidden -marm -fno-omit-frame-pointer -fno-strict-aliasing -O0 -g -DDEBUG -D_DEBUG -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,-allow-shlib-undefined -Wl,--gc-sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now
-- Linker flags (Debug): -Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,-allow-shlib-undefined -Wl,--gc-sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: z dl m log
-- 3rdparty dependencies: libjpeg libwebp libpng libtiff libjasper IlmImf tegra_hal
--
-- OpenCV modules:
-- To be built: core flann imgproc ml photo video imgcodecs shape videoio highgui objdetect superres ts features2d calib3d stitching videostab
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 viz
--
-- Android:
-- Android ABI: armeabi-v7a
-- STL type: gnustl_static
-- Native API level: android-9
-- SDK target: android_sdk_target_status-NOTFOUND
-- Android NDK: /Users/me/AndroidStudioProjects/android-ndk-r12b (toolchain: arm-linux-androideabi-4.9)
-- android tool: NO
-- Google Play manager: NO
-- Android examples: NO
--
-- GUI:
-- GTK+: NO
-- GThread : NO
-- GtkGlExt: NO
-- OpenGL support: NO
-- VTK support: NO
--
-- Media I/O:
-- ZLib: z (ver 1.2.3)
-- JPEG: build (ver 90)
-- WEBP: build (ver 0.3.1)
-- PNG: build (ver 1.6.24)
-- TIFF: build (ver 42 - 4.0.2)
-- JPEG 2000: build (ver 1.900.1)
-- OpenEXR: build (ver 1.7.1)
-- GDAL: NO
-- GDCM: NO
--
-- Video I/O:
--
-- Parallel framework: pthreads
--
-- Other third-party libraries:
-- Use IPP: NO
-- Use Eigen: NO
-- Use Cuda: NO
-- Use OpenCL: NO
-- Use OpenVX: NO
-- Use custom HAL: YES (carotene (ver 0.0.1))
--
-- Python 2:
-- Interpreter: /usr/bin/python2.7 (ver 2.7.10)
--
-- Python 3:
-- Interpreter: /usr/local/bin/python3 (ver 3.6.1)
--
-- Python (for build): /usr/bin/python2.7
--
-- Java:
-- ant: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Matlab: NO
--
-- Documentation:
-- Doxygen: NO
--
-- Tests and samples:
-- Tests: YES
-- Performance tests: YES
-- C/C++ Examples: NO
--
-- Install path: /Users/me/AndroidStudioProjects/opencv-3.2.0/platforms/build_android_arm/install
--
-- cvconfig.h is in: /Users/me/AndroidStudioProjects/opencv-3.2.0/platforms/build_android_arm
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/me/AndroidStudioProjects/opencv-3.2.0/platforms/build_android_arm
最佳答案
在使用 scripts/cmake_android_arm.sh 构建 OpenCV 时，CMakeLists.txt 中定义的默认行为是构建所有模块的静态库，这就是为什么你得到 .a 文件在运行.sh脚本后，但是如果你想构建共享库(.so)文件，那么你需要强制cmake 使用标志 -DBUILD_FAT_JAVA_LIB=ON。
您需要将 scripts/cmake_android_arm.sh 编辑为:
#!/bin/sh
cd `dirname $0`/..
mkdir -p build_android_arm
cd build_android_arm
cmake -DBUILD_FAT_JAVA_LIB=ON -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DCMAKE_TOOLCHAIN_FILE=../android/android.toolchain.cmake $@ ../..
关于android - 从源代码构建 OpenCV4Android 不输出 libopencv_java.so，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44593680/