By Satya Komatineni, Dave MacLean
Android Fragments is a 100-page speedy commence speeded up consultant to studying and fast utilizing Android fragments. You'll find out how to 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 interpreting and utilizing this publication, that's in accordance with fabric from the best-selling professional Android, you'll be an Android UI savant. not less than, your apps' consumer interfaces and occasion dealing with should be extra aggressive and higher appearing, specifically for tablet-optimized UIs and occasions.
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Extra resources for Android Fragments
Listing 2-2 shows a sample onRestoreInstanceState() callback. Listing 2-2. getInt("counter", -1); // Now go do something with someInt to restore the // state of the activity. -1 is the default if no // value was found. } CHAPTER 2: Responding to Configuration Changes 39 It’s up to you whether you restore state in onCreate() or in onRestoreInstanceState(). Many applications will restore state in onCreate() because that is where a lot of initialization is done. One reason to separate the two would be if you’re creating an activity class that could be extended.
For easier management of code, you could embed the fragment listener interface inside of the fragment class definition itself, thus making it easier to keep the listener and the fragment in sync with each other. java. CHAPTER 3: Working with Dialogs 55 This prompt dialog layout looks like many you’ve seen previously. There is a TextView to serve as the prompt; an EditText to take the user’s input; and three buttons for saving the input, dismissing (cancelling) the dialog fragment, and popping a help dialog.
Attr. Be aware that if you target API 13 or higher and you need to handle orientation, you also need to handle screenSize. The default process for a configuration change is the invoking of callbacks to destroy and re-create the activity or fragment. When you’ve declared that you will handle the specific configuration change, the process changes so only the onConfigurationChanged() callback is invoked instead, on the activity and its fragments. Android passes in a Configuration object so the callback knows what the new configuration is.
Android Fragments by Satya Komatineni, Dave MacLean