• cordova plugin add https://github.com/cpietsch/cordova-plugin-opcvExample
• cordova platform add android

• open platform/android in android studio 2

• edit this file: platforms/android/of_v0.9.0_android_release/libs/openFrameworksCompiled/project/android/paths.make

• change the path of your android NDK (mine on OSX: NDK_ROOT=/Users/chris/Library/Android/sdk/ndk-bundle/)

• change the gradle url in gradle-wrapper.properties to distributionUrl=http\://services.gradle.org/distributions/gradle-2.2.1-all.zip

• in android studio: settings.gradle should look like this

// GENERATED FILE - DO NOT EDIT
include ":"
include ":CordovaLib"
//Extras From OpenCV project start here
include ":androidOpenCVExample"
project(':androidOpenCVExample').projectDir = new File('of_v0.9.0_android_release/apps/myApps/androidOpenCVExample')
def ofRoot = 'of_v0.9.0_android_release/'
include ':ofAndroidLib'
project(':ofAndroidLib').projectDir = new File(ofRoot + 'addons/ofxAndroid/ofAndroidLib')
include ':openFrameworksProject'
project(':openFrameworksProject').projectDir = new File(ofRoot + 'libs/openFrameworksCompiled/project/android')
include ':openFrameworks'
project(':openFrameworks').projectDir = new File(ofRoot + 'libs/openFrameworks')
//Extras From OpenCV project end here

• build.gradle should have after // SUB-PROJECT DEPENDENCIES END once compile project(':androidOpenCVExample')
• opcvExample.js should only define the opcvExample once (remove double lines if it appears after plugin add)
• make sure platforms/android/AndroidManifest.xml should have android:targetSdkVersion="22" (at least 22)
• make a gradle sync for openframeworks to be build
• you now can test the app

• you can call the of app like this

 $("#scan").click(function(){
    console.log("scan");

    opcvExample.startScan(function(result){
        alert("done "+result);
    });

})

contributed by sami4064 https://github.com/sami4064/cordova-plugin-opcvExample