How to use opencv in using Gradle?

Since the integration of OpenCV is such an effort, we pre-packaged it and published it via JCenter here: https://github.com/quickbirdstudios/opencv-android

Just include this in your module's build.gradle dependencies section

dependencies {
  implementation 'com.quickbirdstudios:opencv:3.4.1'
}

and this in your project's build.gradle repositories section

repositories {
  jcenter()
}

You won't get lint error after gradle import but don't forget to initialize the OpenCV library like this in MainActivity

public class MainActivity extends Activity {
    static {
        if (!OpenCVLoader.initDebug())
            Log.d("ERROR", "Unable to load OpenCV");
        else
            Log.d("SUCCESS", "OpenCV loaded");
    }
...
...
...
...

You can do this very easily in Android Studio.

Follow the below steps to add Open CV in your project as library.

1. Create a libraries folder underneath your project main directory. For example, if your project is OpenCVExamples, you would create a OpenCVExamples/libraries folder.

2. Go to the location where you have SDK "\OpenCV-2.4.8-android-sdk\sdk" here you will find the java folder, rename it to opencv.

3. Now copy the complete opencv directory from the SDK into the libraries folder you just created.

4. Now create a build.gradle file in the opencv directory with the following contents

   apply plugin: 'android-library'
   
   buildscript {
       repositories {
           mavenCentral()
       }
       dependencies {
           classpath 'com.android.tools.build:gradle:0.9.+'
       }
   }
   
   android {
       compileSdkVersion 19
       buildToolsVersion "19.0.1"
   
       defaultConfig {
           minSdkVersion 8
           targetSdkVersion 19
           versionCode 2480
           versionName "2.4.8"
       }
   
       sourceSets {
           main {
               manifest.srcFile 'AndroidManifest.xml'
               java.srcDirs = ['src']
               resources.srcDirs = ['src']
               res.srcDirs = ['res']
               aidl.srcDirs = ['src']
           }
       }
   }
   

5. Edit your settings.gradle file in your application’s main directory and add this line:

   include ':libraries:opencv'
   

6. Sync your project with Gradle and it should looks like this

   

7. Right click on your project then click on the Open Module Settings then Choose Modules from the left-hand list, click on your application’s module, click on the Dependencies tab, and click on the + button to add a new module dependency.

   

8. Choose Module dependency. It will open a dialog with a list of modules to choose from; select “:libraries:opencv”.

   

9. Create a jniLibs folder in the /app/src/main/ location and copy the all the folder with *.so files (armeabi, armeabi-v7a, mips, x86) in the jniLibs from the OpenCV SDK.

   

10. Click OK. Now everything done, go and enjoy with OpenCV.