title: GoogleApiClient.ConnectionCallbacks error compile time
body: <p>should I use google drive bat I can't compile this activity</p>
  
  <pre><code>package com.google.android.gms.drive.sample.demo;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.content.IntentSender.SendIntentException;
  import android.os.Bundle;
  import android.util.Log;
  import android.widget.Toast;
  
  /**
   * An abstract activity that handles authorization and connection to the Drive
   * services.
   */
  public abstract class BaseDemoActivity extends Activity implements
          GoogleApiClient.ConnectionCallbacks,
          GoogleApiClient.OnConnectionFailedListener {
  ...
  </code></pre>
  
  <p>I use Google Plugin for Eclipse to install the library and google APIs
  but since compile error</p>
  
  <pre><code>GoogleApiClient cannot be resolved to a type
  </code></pre>