Smash your Android App into Fragments
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This document discusses how to use fragments in Android applications to create dynamic user interfaces that can adapt to different screen sizes and densities. It introduces fragments as reusable modules that represent a portion of UI and can be shared across activities. The key points covered include: what problems fragments solve, how to create fragment subclasses, the fragment lifecycle, how to add fragments to activities dynamically or statically via XML, and how to use the support library for backwards compatibility.
Smash your Android App into Fragments
- 1. Smashing your Android App Into Fragments Tom Opgenorth | tom@opgenorth.net
- 2. A Word From Our Sponsors
- 3. 1. Whats the Problem? 2. What Are Fragments? 3. How Do I Use Fragments 4. Look at Code! 5. What about Backwards Compatibility? Things Well Talk About
- 4. What Involved Whats the Problem?
- 6. Screen Sizes & Densities
- 8. Fragments To The Rescue!
- 10. A Fragment represents a behaviour or portion of user interface in an Activity.
- 11. User Interface modules Can share Fragments across different activity On Activity can have many fragments Different screen sizes have different layouts What are Fragments?
- 13. Android 3.0 or Higher (well, sort of/not really) Subclass the Fragment base class They can load Layout files / Create its UI similar to an Activity There are specialized fragments Fragments have a lifecycle, just like Activities Fragment Basics
- 16. How Do I Create Fragments?
- 17. Fragments Need Help Must be hosted in an Activity Activities are Not Directly Aware of their Fragments Fragments are aware of their host Activity Fragments are not aware of other Fragments FragmentManager is the middle man
- 18. Fragment Manager Activity Fragment Manager FragmentFragmentFragmentFragment Find Fragment 1.Activity looking for a Fragment 2. Searches Fragments 3. Found the request Fragment
- 19. Adding a Static Fragment <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent"> <fragment class="net.opgenorth.shakespeare.TitlesFragment" android:id="@+id/titles_fragment" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout>
- 20. Adding a Dynamic Fragment // Make new fragment to show this selection. DetailsFragment details = new DetailsFragment(); // Execute a transaction, adding the fragment to the FrameLayout. FragmentTransaction ft = FragmentManager.beginTransaction(); ft.add(Resource.Id.details, details, "details_fragment"); ft.commit();
- 21. Show Me The Code!
- 23. Android Support Libraries A set of code libraries that provide backwards compatibility and features to older API levels
- 24. Building a Dynamic UI with Fragments - http://developer.android.com/ training/basics/fragments/index.html Support Libraries - http://developer.android.com/tools/support-library/ index.html Links / References