title: Why when I create a new activity, "setContentView" not recognize my layout?
body: <p>I just created a new activity (project-> new-> android activity) and I get an error where the R file, which does not recognize the layout created by the activity. I use <strong>Ubuntu 13.10 (64 bits)</strong></p>
  
  <pre><code>public class OrderKaraokeActivity extends SherlockActivity {
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_order_karaoke);
      }
  }
  </code></pre>
  
  <p>activity_order_karaoke:</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:paddingBottom="@dimen/activity_vertical_margin"
      android:paddingLeft="@dimen/activity_horizontal_margin"
      android:paddingRight="@dimen/activity_horizontal_margin"
      android:paddingTop="@dimen/activity_vertical_margin"
      tools:context=".OrderKaraokeActivity" &gt;
  
      &lt;TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@string/hello_world" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/cGMjt.png" alt="enter image description here"></p>
  
  <p>Console:</p>
  
  <pre><code>Description Resource    Path    Location    Type
  activity_order_karaoke cannot be resolved or is not a field OrderKaraokeActivity.java   /src/com/example/adicionalesprueba  line 18 Java Problem
  </code></pre>
  
  <p>Import:</p>
  
  <p><img src="https://i.stack.imgur.com/HMM6r.png" alt="enter image description here"></p>
  
  <p>Console problem:</p>
  
  <p><img src="https://i.stack.imgur.com/lhQHt.png" alt="enter image description here"></p>