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copied!<p>The typical mechanism is to use <a href="http://developer.android.com/reference/android/app/FragmentManager.html#findFragmentByTag(java.lang.String)" rel="nofollow noreferrer"><code>FragmentManager.findFragmentByTag()</code></a> . You use this and add tags to your fragments (or the alternative for id's). This way you can determine what fragments are currently being managed. Then, once you have a handle to a present fragment (findFragmentByTag returns non-null), you can use <a href="http://developer.android.com/reference/android/app/FragmentManager.html#beginTransaction()" rel="nofollow noreferrer"><code>FragmentManager.beginTransaction()</code></a> to start a FrgamentTransaction and remove / add the necessary fragments. Working in this way will allow you to avoid the 're-adding' process for the fragment you want to keep. </p> <p>What I'd probably do is have code like so: (warning psuedo code)</p> <pre><code>Fragment pane1 = FragmentManager.findFragmentByTag("myFragmentPane1"); Fragment pane2 = FragmentManager.findFragmentByTag("myFragmentPane2"); setupScreen(pane1, pane2); </code></pre> <p>You should also consider sub-classes of your class instead of having 'everything in one class'. You have a fairly obvious case of Martin Fowler's <a href="http://www.refactoring.com/catalog/replaceConditionalWithPolymorphism.html" rel="nofollow noreferrer">Replace Conditional with Subclass</a>. Otherwise, I fear this is going to be incredibly hard to manager when you add another screen.</p>

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