Android Fragments by Satya Komatineni, Dave MacLean

By Satya Komatineni, Dave MacLean

Android Fragments is a 100-page quickly begin speeded up consultant to studying and fast utilizing Android fragments. You'll find out how to code for fragments; care for config alterations; code for normal vs. fragmented dialogs; paintings with personal tastes and saving nation; paintings with the compatibility library; and deal with complex async projects and growth dialogs.

After examining and utilizing this ebook, that's in response to fabric from the best-selling seasoned Android, you'll be an Android UI savant. at least, your apps' consumer interfaces and occasion dealing with can be extra aggressive and higher appearing, in particular for tablet-optimized UIs and occasions.

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You make a simple determination of the device’s orientation, and as long as you’re in portrait mode, you set up a new details fragment within this details activity. If you’re in landscape mode, your MainActivity is able to display both the titles fragment and the details fragment, so there is no reason to be displaying this activity at all. You may wonder why you would ever launch this activity if you’re in landscape mode, and the answer is, you wouldn’t. However, once this activity has been started in portrait mode, if the user rotates the device to landscape mode, this details activity will get restarted due to the configuration change.

This means when a device configuration changes (for example, the device rotates), the activity is restarted and the fragments are also restarted. You saw this earlier when you rotated the device while running the Shakespeare sample application in chapter 1. A device-configuration change doesn’t affect dialogs because they are also managed by the fragment manager. But the implicit behavior of show() and dismiss() means you can easily lose track of a dialog fragment if you’re not careful. The show() method automatically adds the fragment to the fragment manager; the dismiss() method automatically removes the fragment from the fragment manager.

40 CHAPTER 2: Responding to Configuration Changes Just like with activities, be careful not to include items in the bundle object that refer to an activity or to a fragment that might not exist later when this fragment is being re-created. Keep the size of the bundle as small as possible, and as much as possible store long-lasting data outside of activities and fragments and simply refer to it from your activities and fragments. Then your destroy/create cycles will go that much faster, you’ll be much less likely to create a memory leak, and your activity and fragment code should be easier to maintain.

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