title: Change the text on a button in the program
body: <p>The text on my buttons are set in resource files. E.g.</p>
  
  <pre><code>            &lt;Button android:id="@+id/up_button" android:layout_width="fill_parent"
                  android:layout_height="wrap_content" android:text="@string/up_label" /&gt;
  </code></pre>
  
  <p>The above code defines a button with text <code>@string/up_label</code>. How can I change this text in my program during the application is running. </p>
  
  <p>Thanks. </p>