title: Android Studio error: package com.android.vending.billing.util does not exist
body: <p>currently going through implementation of in app billing and have done the following.</p>
  
  <p>Updated manifest to include billing</p>
  
  <p>Placed aidl file
  aidl folder // com.android.vending.billing. "IInAppBillingService.aidl"</p>
  
  <p>Then i also have the helper classes under "util" in the same directory
  com.android.vending.billing.util.IabHelper;</p>
  
  <p>When running them as imports in my main activity i am getting an error when compiling, but missing variables are recognized when these are imported.</p>
  
  <pre><code>import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.View;
  import android.widget.Button;
  import android.content.Intent;
  
  import com.android.vending.billing.IInAppBillingService;
  import com.android.vending.billing.util.IabHelper;
  import com.android.vending.billing.util.IabResult;
  import com.android.vending.billing.util.Purchase;
  import com.android.vending.billing.util.Inventory;
  </code></pre>
  
  <p>The errors are as follows. </p>
  
  <p>Error:(11, 40) error: package com.android.vending.billing.util does not exist</p>
  
  <p>Error:(12, 40) error: package com.android.vending.billing.util does not exist</p>
  
  <p>Error:(13, 40) error: package com.android.vending.billing.util does not exist</p>
  
  <p>Error:(14, 40) error: package com.android.vending.billing.util does not exist</p>
  
  <p>Not sure what the issue is here. All help appreciated</p>
  
  <p>Thank you</p>