By Satya Komatineni, Dave MacLean

ISBN-10: 1484208544

ISBN-13: 9781484208540

Android Fragments is a 100-page fast commence sped up consultant to studying and speedy utilizing Android fragments. You'll easy methods to code for fragments; care for config alterations; code for normal vs. fragmented dialogs; paintings with personal tastes and saving country; paintings with the compatibility library; and deal with complicated async projects and development dialogs.

After interpreting and utilizing this ebook, that's in response to fabric from the best-selling seasoned Android, you'll be an Android UI savant. a minimum of, your apps' person interfaces and occasion dealing with may be extra aggressive and higher appearing, in particular for tablet-optimized UIs and occasions.

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Additional resources for Android Fragments

Sample text

This feature is very powerful in that you can use a non-UI fragment to handle references to your data objects and background threads, and call setRetainInstance(true) on this fragment so it won’t get destroyed and re-created on a configuration change. The added bonus is that during the normal configuration change process, the non-UI fragment callbacks onDetach() and onAttach() will switch the activity reference from the old to the new. Deprecated Configuration Change Methods A couple of methods on Activity have been deprecated, so you should no longer use them: getLastNonConfigurationInstance() onRetainNonConfigurationInstance() These methods previously allowed you to save an arbitrary object from an activity that was being destroyed, to be passed to the next instance of the activity that was being created.

Listing 3-1. other activity functions } Note We provide a link to a downloadable project at the end of this chapter in the “References” section. You can use this download to experiment with the code and the concepts presented in this chapter. From Listing 3-1, the steps to show a dialog fragment are as follows: 1. Create a dialog fragment. 2. Get a fragment transaction. 3. Show the dialog using the fragment transaction from step 2. Let’s talk about each of these steps. Constructing a Dialog Fragment When constructing a dialog fragment, the rules are the same as when building any other kind of fragment.

Fragment has other subclasses: the DialogFragment, PreferenceFragment, and WebViewFragment. We’ll cover DialogFragment and PreferenceFragment in Chapters 3 and 4, respectively. Communications with Fragments Because the fragment manager knows about all fragments attached to the current activity, the activity or any fragment in that activity can ask for any other fragment using the getter methods described earlier. Once the fragment reference has been obtained, the activity or fragment could cast the reference appropriately and then call methods directly on that activity or fragment.

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