title: r.id id cannot be resolved
body: <p>while i have programming an android program about voice recognizing i have a little problem.what is the r.id cannot be resolved i have try to change my xml files which includes res folder.it doesnt works.what can i do ?</p>
  
  <p>my main.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:orientation="vertical" &gt;
  
      &lt;TextView
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:text="@string/hello" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>