 <blockquote> <p>FeedListActivity is the Fragment activity. Now i need to add the Feedlistactivity as a Fragment in my Main Activity. How can i achieve this ?</p> </blockquote> <p>A fragmentActivity is not a fragment. It's an activity with support for fragments, it was introduced to make older android builds backward compatible with fragments -- if you're targeting newer API's only you can ignore it. To make make FeedListActivity() a fragment...you must extend from fragment. </p> <pre><code>Fragment newFragment = new Fragment(); </code></pre> <p>This line here should be creating a new instance of FeedList after you make it a fragment.</p>