cannot resolve symbol 'samples' during import

[sungju1203]

trafficstars

im trying to use barcode-reader in visionSamples to implement in webview in my existing app. So I started off with adding BarcodeCaptureActivity class (copy and paste from sample) and added to my project and made small change in build.gradle. however, android studio cannot recognize these 3 imports: import com.google.android.gms.samples.vision.barcodereader.ui.camera.CameraSource; import com.google.android.gms.samples.vision.barcodereader.ui.camera.CameraSourcePreview;

import com.google.android.gms.samples.vision.barcodereader.ui.camera.GraphicOverlay;

i have samples marked red and error message is telling me that "error: package com.google.android.gms.samples.vision.barcodereader.ui.camera does not exist" why am i getting this error?

[crescent7272]

same here I do not know what am I missing.