Cross-compile OpenCV for android use CMake#

1.Get Android Standalone Toolchains#

2.Get Android SDK#

3.Install Nanja and Ant#

4.Compile#

cmake \
-DCMAKE_TOOLCHAIN_FILE=../platforms/android/android.toolchain.cmake \
-DANDROID_STL=gnustl_shared \
-DANDROID_NATIVE_API_LEVEL=23 ..