Android Fragments by Satya Komatineni, Dave MacLean

By Satya Komatineni, Dave MacLean

Android Fragments is a 100-page speedy begin sped up consultant to studying and quick utilizing Android fragments. You'll code for fragments; take care of config adjustments; code for normal vs. fragmented dialogs; paintings with personal tastes and saving kingdom; paintings with the compatibility library; and deal with complex async initiatives and development dialogs.

After analyzing and utilizing this publication, that is in keeping with fabric from the best-selling seasoned Android, you'll be an Android UI savant. no less than, your apps' person interfaces and occasion dealing with might be extra aggressive and higher acting, in particular for tablet-optimized UIs and occasions.

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Sample text

The show() method on a dialog fragment takes a fragment transaction as an input. You can see this in Listing 3-1. The show() method uses the fragment transaction to add this dialog to the activity and then commits the fragment transaction. However, the show() method does not add the transaction to the back stack. If you want to do this, you need to add this transaction to the back stack first and then pass it to the show() method. The show() method of a dialog fragment has the following signatures: public int show(FragmentTransaction transaction, String tag) public int show(FragmentManager manager, String tag) The first show() method displays the dialog by adding this fragment to the passed-in transaction with the specified tag.

There are a few caveats you should know about this method of saving fragment state: The fragment to be saved must currently be attached to the fragment manager. A new fragment created using this saved state must be the same class type as the fragment it was created from. The saved state cannot contain dependencies on other fragments. Other fragments may not exist when the saved fragment is re-created. CHAPTER 2: Responding to Configuration Changes 41 Using setRetainInstance on a Fragment A fragment can avoid being destroyed and re-created on a configuration change.

Then you have the separate DetailsActivity with a category of DEFAULT. This allows you to start the details activity from code but will not show the details activity as an app in the App list. Persistence of Fragments When you play with this sample application, make sure you rotate the device (pressing Ctrl+F11 rotates the device in the emulator). You will see that the device rotates, and the fragments rotate right along with it. If you watch the LogCat messages, you will see a lot of them for this application.

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