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copied!<p>According to the android documentation of fragments: <strong>A Fragment represents a behavior or a portion of user interface in an Activity. You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities. You can think of a fragment as a modular section of an activity, which has its own lifecycle, receives its own input events, and which you can add or remove while the activity is running (sort of like a "sub activity" that you can reuse in different activities).</strong></p> <p><a href="http://developer.android.com/guide/components/fragments.html" rel="nofollow">http://developer.android.com/guide/components/fragments.html</a></p> <p>what i understood from your question is that you want to the content of your fragement <code>viewer</code> at run-time. a possible solution which i can suggest for this is: Instead of your four classes extending <code>Activity</code>, extend <code>Fragment</code>, each having its own layout. Modify the main layout file to look something like this:</p> <pre><code><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent"> <fragment android:name="com.example.news.ArticleListFragment" android:id="@+id/list" android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" /> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/viewer" android:layout_weight="2" android:layout_width="0dp" android:layout_height="match_parent" > </FrameLayout> </LinearLayout> </code></pre> <p>the FrameLayout will basically act as a container for your fragments, which you can dynamically load at run-time(by clicking the ListView). This tutorial will help you out with it:</p> <p><a href="http://developer.android.com/training/basics/fragments/fragment-ui.html" rel="nofollow">http://developer.android.com/training/basics/fragments/fragment-ui.html</a></p> <p>Hope my answer helps you in some way.</p>

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