To setup the same project in your system first download the opencv sdk from this link:

https://sourceforge.net/projects/opencvlibrary/files/4.2.0/opencv-4.2.0-android-sdk.zip/download

Extract the above zip file.

Then open the ScanIN/ScanIN folder in Android Studio and change the following files:

1. In file local.pro perties change the sdk.dir to the Android Sdk location on your system.

2. If the ScanIN/ScanIN/gradle.properties doesn't exist create it.

3. Add the following settings in your gradle.properties file:

org.gradle.jvmargs=-Xmx2048m android.useAndroidX=true android.enableJetifier=true opencvsdk=/home/kaushal/Android/opencv-4.2.0-android-sdk/OpenCV-android-sdk 

4. Change the opencvsdk to such that the path {opencvsdk}/sdk points to the OpenCV sdk folder. For eg. if your OpenCV SDK is located at /home/kaushal/Android/opencv-4.2.0-android-sdk/OpenCV-android-sdk/sdk then:

opencvsdk=/home/kaushal/Android/opencv-4.2.0-android-sdk/OpenCV-android-sdk