title: change style attribute at runtime
body: <p>I set the application theme using the following style</p>
  
  <pre><code>    &lt;style name="Background1" parent="@android:style/Theme.NoTitleBar.Fullscreen"&gt;
          &lt;item name="android:windowBackground"&gt;@drawable/bigl_2&lt;/item&gt;
          &lt;item name="android:windowNoTitle"&gt;true&lt;/item&gt;
      &lt;/style&gt;
  </code></pre>
  
  <p>using this method :</p>
  
  <pre><code>setTheme(R.style.background1);
  </code></pre>
  
  <p>Here my requirement is I want to change the theme with a bitmap image, how can I do it at runtime?</p>
  
  <p>Thanks</p>