unable to build opencv for android

Question

I am trying to build opencv pulled from github for android

I am running following command

cd ~/extProjects/opencv && cd build_android && cmake -DANDROID_SDK_TOOLS=~/Android/Sdk/tools -DANDROID_NDK=~/Android/Sdk/ndk/ -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=~/extProjects/opencv/platforms/android/android.toolchain.cmake -DANDROID_PLATFORM=android-32 -DINSTALL_CREATE_DISTRIB=ON -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX=./install ~/extProjects/opencv && make

NDK path is correct and here is the version ~/Android/Sdk/ndk/25.1.8937393 But I am getting following error

CMake Error at platforms/android/android.toolchain.cmake:628 (message):
  Could not find any working toolchain in the NDK.  Probably your Android NDK
  is broken.

Any suggestions where to look for and fix this?

Answer 1

Got it working after having to do additional defines

cd ~/extProjects/opencv && cd build_android && cmake -DANDROID_SDK_TOOLS=/your/home/path/Android/Sdk/build-tools -DANDROID_SDK_TOOLS_VERSION=33.0.1 -DANDROID_SDK=/your/home/path/Android/Sdk -DANDROID_NDK=~/Android/Sdk/ndk/25.1.8937393 -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=~/Android/Sdk/ndk/25.1.8937393/build/cmake/android.toolchain.cmake -DANDROID_PLATFORM=android-30 -DINSTALL_CREATE_DISTRIB=ON -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=./install ~/extProjects/opencv && make

Also note for the android SDK path, giving "~" for home directory does not work

Compilation has started.. have to now see if I can get it work:|