Package com.google.zxing missing in Zxing barcode library for Android

I have downloaded the Zxing Barcode Scanner code for Android, but I can't find the package com.google.zxing in the source code. I think there's a missing library or JAR file for the project. Can anybody help me find that package?

These are the unresolved imports:

  import com.google.zxing.BarcodeFormat;
  import com.google.zxing.Result;
  import com.google.zxing.ResultMetadataType;
  import com.google.zxing.ResultPoint;