title: error in xml file
body: <p>when i complie this file i got these error
  error: Error parsing XML: not well-formed (invalid token)
  R cannot be resolved to a variable  </p>
  
  <p>this is the android xml file</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
           android:orientation="vertical"
           android:background="@drawable/ic_launcher"
          &lt;TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@string/hello_world"
          /&gt;
        &lt;TextView
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:text="this is main text"
          android:gravity="center"
          /&gt;
       &lt;TextView
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:text="@string/title"
          /&gt;
  
       &lt;Button
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Tutorials"
           android:textSize="25px"
           android:textStyle="bold" /&gt;
  
  /&gt;
  </code></pre>