![]() My sdk did not include the project.property file so I stole it from the OpenCV4Android sdk and it worked.Here’s a tutorial for how to do that in Android Studio Use the sdk folder as you would with the opencv4android_sdk you can download from the OpenCV website.This should generate a folder /install inside your android-arm folder, the android_arm/install/sdk is the opencv4android we just build from trunk.after everything is made, >make install.Open Terminal, navigate to your opencv-master/platforms/android-arm folder where your builds are.Configure one last time, then hit Generate.Also if you don’t add java wrapper to them these errors will not occur. It’s probably because I didn’t have some modules needed installed. Since I didn’t need them anyways so I just unselected them. The following classes caused error during make.For OPENCV_EXTRA_MODULES_PATH, select opencv_contrib-master/modules Under OPENCV, select OPENCV_ENABLE_NONFREE. It would compile and everything but when you import the library into Android Studio those modules may throw error I would recommend against wrapping something in Java when the module itself didn’t suggest the wrap.If there’s no WRAP, change so that ocv_define_module(… stuff … WRAP java) If there’s no java, add java after the python so it becomes WRAP python java. For the non free modules you’d like to include, modify the CMakeLists.txt: Inside the ocv_define_module() usually there’s a WRAP python. Inside opencv_contrib-master/modules folder, each module should have a CMakeLists.txt file.If you don’t want Java then skip this step It should look something like this if you scroll up the log. After Configure, you wanna check if the Java wrapper is YES.Those are just warnings and everything should compile without error You will see lots of red warnings about something being deprecated. Unix Makefile and Use default native compiler are the default option and just go with that and click Finish. When all 3 entries are added it should look like this.Click Add Entry, Name is CMAKE_TOOLCHAIN_FILE, Type is FILEPATH, then browse for opencv-master/platforms/android/.Click Add Entry, Name is ANDROID_NDK_HOST_X64, Type is BOOL, then select the value checkbox (this step is optional).Click Add Entry, Name is ANDROID_NDK, Type is PATH, then browse for your android-ndk-xxx folder (xxx should be the version number whichever version you have, mine was r13b).If you run into something and need to start this process again, make sure the /android_arm folder is empty You always want to start with a clean build.Browse Build, select opencv-master/platforms/android_arm.Open the CMake gui, it should look the following no matter what OS you have.I’m choosing this folder for convenience of demonstration. This folder can be created anywhere in your computer. in opencv-master/platforms, create a folder named android-arm (it’s path will look like opencv-master/platforms/android_arm).They should automatically be in folders named opencv-master, openCV_contrib-master, and android-ndk-xxx (xxx being whatever version you downloaded). Unzip OpenCV, OpenCV_Contrib, and Android NDK.JDK ( download JDK 8 here or google JDK for the latest version).Things you need for the Java Wrapper (if you want to use java) My mac has 2 and 3 installed so I didn’t run into the problem. I had the problem in Windows where I had to download both the 2.You can do without it if you follow the ReadMe in the OpenCV and OpenCV_Contrib Git repo. ![]() CMake (get the binary installer if you don’t want to build from source). ![]()
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