An android developer would know that fragments in the Android API are a powerful set of tools. But with that great power it puts great responsibility on the developer. Fragment debugging is an informative presentation on how to effectively use android fragments.

1. Debugging Android
Fragments
Meghaditya Roy Chaudhury
Software Engineer, Citrix

2. Fragment – What and Why?
 Definition: A Fragment represents a behavior or a portion of
user interface in an activity.
 Flexible UI
 Re-usable
 Embedded in the parent activity
 Application specific subclasses –
◦ DialogFragment, ListFragment, PreferenceFragment
Key Classes:
- Fragment
- FragmentManager
- FragmentTransaction
Ref:
http://developer.android.com/guide/components/fragments.html

3. Fragment Life cycle

4. Concerns for Developers
 Creation of fragments
◦ Adding UI
◦ Adding to parent activity
 Management of fragments
 Performing fragment transactions
 Communicating with activities and
other fragments
 Handling the fragment life-cycle

5. (Fragment + Activity) Lifecycle

6. FragmentManager.enableDebugLogging
(true)

7. Fragment in action

8. Fragment Debugging -
Terminology
 moveFrom RESUMED – fragment.onPause()
 moveFrom STARTED – fragment.onStop()
 moveFrom ACTIVITY_CREATED – ??? [getActivity() is
destroyed]
 moveFrom CREATED – fragment.onDestroy()
 moveTo CREATED – fragment.onCreate()
 moveTo ACTIVITY_CREATED – fragment.onActivityCreated()
 moveTo STARTED – fragment.onStart()
 moveTo RESUMED – fragment.onResume()
 BackStackEntry Listing
 BackStack Operations – add, commit, remove

9. MainActivity - onCreate

10. Application Launch – Debug
Log

11. Application moved to
Background

12. Application on Rotation

13. Safer to play by the book
 Fragment best practices guidelines –
◦ Creating a fragment –
 https://developer.android.com/training/basics/fr
agments/creating.html
◦ Building a flexible UI -
 https://developer.android.com/training/basics/fr
agments/fragment-ui.html
◦ Communicating with other fragments –
 https://developer.android.com/training/basics/fr
agments/communicating.html

14. Work Better. Live Better.
CITRIX