Android Studio + Kotlin + Open CV

3 min readAug 14, 2023

so this is if you are getting frustrated with how to integrate OpenCV 4.x.x with Android Studio.

2. Unzip the SDK

3. Create an Android project

4. Add OpenCV SDK as a dependency

As soon as you’ll add you’ll see this error

Namespace not specified. Please specify a namespace in the module's build.gradle file like so:

android {
    namespace 'com.example.namespace'
}

5. Let's solve this error

open android project as Project:

access the build.gradle file of opencv

add namespace ‘org.opencv’ under android

sync the gradle by tapping on Try again

you should see something like this

6. Let's add opencv as a dependency to the main app

open project structure

add ‘opencv’ as a dependency to the main app

7. Run the app in debug mode you should see this error:

error: package org.opencv.engine does not exist
import org.opencv.engine.OpenCVEngineInterface;
                        ^

to fix this we need to modify the build feature to support aidl

AGP 8.0 build.gradle namespace and aidl buildFeature requirement added by onuralpszr · Pull Request…

github.com

open build.gradle of ‘opencv’ and add

buildFeatures {
        aidl true
}

8. After this you should get this error

import org.opencv.BuildConfig;

Fix:

forum.opencv.org

9. Let's check if OpenCV is successfully added to the project or not

Add these lines to MainActivity.kt

You should see this output.

Hope this helps you.

Happy Coding.

Satya Mallick: Please get the documentation updated

Acknowledgements:

forum.opencv.org