Download Android Fragments by Satya Komatineni, Dave MacLean PDF

By Satya Komatineni, Dave MacLean

Android Fragments is a 100-page speedy commence speeded up advisor 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 kingdom; paintings with the compatibility library; and deal with complicated async initiatives and growth dialogs.

After interpreting and utilizing this e-book, that's according to fabric from the best-selling seasoned Android, you'll be an Android UI savant. not less than, your apps' person interfaces and occasion dealing with should be extra aggressive and higher acting, specifically for tablet-optimized UIs and occasions.

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Extra info for Android Fragments

Example text

If the user presses the Back button, because you’ve saved this transaction on the back stack, the new dialog is dismissed and the previous dialog is displayed. This is a handy way of displaying a help dialog, for example. 52 CHAPTER 3: Working with Dialogs Implications of a Dialog Dismiss When you add any fragment to a fragment manager, the fragment manager does the state management for that fragment. This means when a device configuration changes (for example, the device rotates), the activity is restarted and the fragments are also restarted.

Taking advantage of these makes configuration changes quick and painless. Keep data and business logic outside of activities if you can. The configuration change process is somewhat similar between activities and fragments. When an activity is being destroyed and re-created, the fragments within that activity get destroyed and re-created. What we need to worry about then is state information about our fragments and activity, such as data currently being displayed to the user, or internal values that we want to preserve.

It’s very nice that your titles fragment class doesn’t need to include much code to deal with the device reconfiguration. Take a moment to view this application’s manifest file. In it you find the main activity with a category of LAUNCHER so that it will appear in the device’s list of apps. 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).

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