What are the steps necessary for me to integrate,
into a pure C++(No Java Code) Android NDK project, such as Android NDK Google tutorial:
official documentation for android integration refers to much older version :OpenCV-2.4 and folder structures are no longer the same.
I am using Android Studio on Linux.
All help is highly Appreciated.
Download opencv Android package (e.g. opencv-4.0.1-android-sdk) and unpack to, say,
To the bottom of CMakeLists.txt, add
set( OpenCV_DIR "~/android/OpenCV-android-sdk/sdk/native/jni" ) find_package( OpenCV REQUIRED ) target_link_libraries(game opencv_java)
The package will define the following variables:
OpenCV_LIBS : The list of all imported targets for OpenCV modules.
OpenCV_INCLUDE_DIRS : The list of OpenCV include directories. With CMake >= 2.8.11 you don’t even need to write
This version of prebuilt OpenCV SDK defines also
OpenCV_VERSION : The version of this OpenCV build: "4.0.1"
OpenCV_ANDROID_NATIVE_API_LEVEL : Minimum required level of Android API: "16".
This means that your app manifest needs minSdkVersion 16 or higher (the original sample needs a fix here).
Instead of the shared library that contains all OpenCV functionality, you can use static libraries (opencv_imgcodecs, opencv_stitching, et al). These static libraries assume the default ANDROID_STL=c++_static.
For best results, use NDK r.18 or r.19.
UPDATE: NDK r.21 works well for opencv 4.3.0.
Answered By – Alex Cohn
Answer Checked By – Gilberto Lyons (Easybugfix Admin)