cd opencv_android
cmake -DANDROID_NATIVE_API_LEVEL=android-24 -DANDROID_ABI=armeabi-v7a -DCMAKE_TOOLCHAIN_FILE=../platforms/android/android.toolchain.cmake ../
make -j8 && make install
mkdir opencv_android_x86_64
cd opencv_android_x64
cmake -DANDROID_NATIVE_API_LEVEL=android-24 -DANDROID_ABI=x86_64 -DCMAKE_TOOLCHAIN_FILE=../platforms/android/android.toolchain.cmake ../
make -j8