Tutorial for open cv integration in Android Studio

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with that tutorial I am not able to init opencv it always enter else block

when i change the build.gradle file according to video

android { compileSdkVersion 23 buildToolsVersion "23.0.2"

defaultConfig {
    minSdkVersion 8
    targetSdkVersion 23
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}

}

I get the following error :

"Failed to find Build Tools version 23.0.2" Install Build Tools 23.0.2 and sync project

Instead of using the "Install Build..." option , can i find out the values of my current installation and substitute ? In other words, how do i find out the version of buildTools , I currently have and work with that ? Thank you for your time and help

nevermind, answered my own question : under Project view > Right click on <project name=""> open module dependencies > Under Modules > app > the drop down for Build Tools Version only had 2 options - 23.0.1, and 24.0.0. So in the build.gradle file I changed the value for buildToolsVersion to 23.0.1. Then it gave me a warning saying "BuildToolsVersion 23.0.1 is old.Recommend changing to 23.0.2. So I installed 23.0.2, and changed the build.gradle file for "openCVLibrary310" . And everything compile fine after that. Thank you.