Typically you get in this method a reference to the activity which uses the fragment for further initialization work. Over in the TutViewerActivity class, add the functionality back to retrieve the Intent and then call the updateUrl() method, like so:At this point, the application behavior remains unchanged.

Android Fragments Examples.
Step 3: Creating the Fragment Classes This will change shortly, but not just yet.

Instead of querying the launch intent to find out which URL to load, the fragment will wait to be told what URL to load. You create fragments by extending Fragment class and You can insert a fragment into your activity layout by declaring the fragment in the activity's layout file, as a element.

To reiterate, in a fragment-based architecture, the A fragment, like an activity, has an XML layout file and a Java class that represents the The XML layout file is just like any other layout file, and can be named There are two ways to add a fragment to an activity: dynamically using Before embedding a "support" fragment in an Activity make sure the Activity is changed to extend from In this case, you want to add a "placeholder" container (usually a If the fragment should always be within the activity, use XML to statically add the fragment but in more complex cases be sure to use the Java-based approach.Fragment has many methods which can be overridden to plug into the lifecycle (Here's an example of how you might use the various fragment lifecycle events:Often we need to lookup or find a fragment instance within an activity layout file. First, let's make the fragments independent of the activity in which they reside.

In the layout-land folder (which you may need to create), add a copy of tutlist_fragment.xml. One fragment will contain the current ListView and another will contain the WebView. A fragment is a reusable class implementing a portion of an activity. If so, launching a new activity would make no sense.We'll return to resolve these issues later in this tutorial.Now create a new layout file called tutlist_fragment.xml to represent the Fragment containing the list of articles.
Its onCreate() method should now look like this:Try running the application now. Not very exciting yet, is it? In this way, an application can dynamically adjust its workflow and user interfaces with relatively little coding overhead. // This event is triggered soon after onCreateView().// Any view setup should occur here. The primary options are:Check the guides linked above for detailed steps for each of these approaches.A record of all Fragment transactions is kept for each Activity by the FragmentManager. This can be done by adding an You then also need to notify the fragment that it's menu items should be loaded within the fragment's Note that the fragment’s method is called only when the Activity didn’t consume the event first. E.g., view lookups and attaching view listeners.// EditText etFoo = (EditText) view.findViewById(R.id.etFoo);// Replace the contents of the container with the new fragment// or ft.add(R.id.your_placeholder, new FooFragment());// This event fires 1st, before creation of fragment or any views// The onAttach method is called when the Fragment instance is associated with an Activity. Following are the 3 main usage of Fragments in Android, for which Fragments were introduced: Modularity: If a single activity is having too many functional components, its better to divide it into independent fragments, hence making the code more organized and easier to maintain. Polishing is beyond the scope of this tutorial, but you can see how, with the judicisious use of layouts and a little bit of activity logic, you can achieve powerful but flexible screen workflows for a variety of screens and devices.The Fragment API helps organize user interface components so that they can be reused across activities. There are a few methods for looking up an existing fragment instance:If the fragment was statically embedded in the XML within an activity and given an If the fragment was dynamically added at runtime within an activity then we can lookup this fragment by tag by calling If the fragment was dynamically added at runtime within an activity into a Fragments should generally only communicate with their direct parent activity. Our latest books include Sams Teach Yourself Android Application Development in 24 Hours (3rd Edition), Introduction to Android Application Development: Android Essentials (4th Edition), and Advanced Android Application Development (4th Edition).

The following figure illustrates just such a redesign:Now that we know how the new screen workflow will be designed, we also know that the two current activities will need to be converted to fragments. Add a Fragment to an Activity using XML.

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