ogero/OPENCV341_Android_compile.MD

## OPENCV341_Android_compile.MD

      
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              OPENCV341_Android_compile.MD
            
          
    Compilation of OpenCV & contrib modules from sources for Android

This process explains how to compile shared libs of opencv and contrib modules from sources for Android ABI abi-armeabi-v7a.
##Requirements

Sources for opencv-3.4.1
Sources for opencv_contrib-3.4.1
CMake 3.11.3
mingw-w64 x86_64-7.3.0-posix-seh-rt_v5-rev0
Android ndk

CMake


Extract opencv-3.4.1 inside opencv/opencv-3.4.1
Extract opencv_contrib-3.4.1 inside opencv/opencv_contrib-3.4.1
In CMake (cmake-gui) input Where is the source folder: opencv/opencv-3.4.1
In CMake (cmake-gui) input Where to build the binaries: opencv/build_android_arm

CMake Configuration options for android arm abi (search or add if missing)


Remove line 1090 (android_get_compatible_target(android_sdk_target_status ${ANDROID_NATIVE_API_LEVEL} ${ANDROID_SDK_TARGET} 11) from opencv/opencv-3.4.1CMakeLists.txt (see opencv/opencv#10929)
Add ANDROID_NDK = android/sdk/ndk-bundle
Add ANDROID_NATIVE_API_LEVEL = 16
Add ANDROID_NDK_HOST_X64 = 1
Configure
With MinGW Makefiles generator.
Specify toolchain file for cross-compiling: android/sdk/ndk-bundle/build/cmake/android.toolchain.cmake.
Wait for configuration..
Change ANDROID_EXECUTABLE = android/sdk/tools/android.bat
Change OPENCV_EXTRA_MODULES_PATH = opencv/opencv_contrib-3.4.1/modules
Change BUILD_ANDROID_EXAMPLES = 0
Change BUILD_DOCS = 0
Change BUILD_TESTS = 0
Change BUILD_PERF_TESTS = 0
Change ENABLE_PRECOMPILED_HEADERS = 0
Change ENABLE_CXX11 = 1
Change BUILD_SHARED_LIBS = 1
Change WITH_CAROTENE = 0
Change BUILD_ZLIB = 1
Change BUILD_JAVA = 0
Configure
Generate

Compile and install


Open a command line at opencv/build_android_arm
Run mingw32-make and wait for compile process.
Run mingw32-make install
Shared libs should be at opencv/build_android_arm/install/sdk/native/libs/armeabi-v7a
Header files should be at opencv/build_android_arm/install/sdk/native/jni/include