How to use opencv in using Gradle?

Omer Sonmez picture Omer Sonmez · Jul 21, 2013 · Viewed 103k times · Source

I want to use Android Studio to develop an app using Gradle build tool. I can not insert the OpenCV repo and library on build.gradle. My .gradle file is like below:

buildscript {
    repositories {
        mavenCentral()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.5.+'
    }
}
apply plugin: 'android'

repositories {
    mavenCentral()
}

dependencies {
    compile 'com.android.support:support-v4:13.0.+'
}

android {
    compileSdkVersion 17
    buildToolsVersion "17.0.0"

    defaultConfig {
        minSdkVersion 7
        targetSdkVersion 16
    }
}

How can I add OpenCV in my project?

Answer

Ajay S picture Ajay S · Mar 15, 2014

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

    screen 1

  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.

    enter image description here

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

    enter image description here

  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.

    enter image description here

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