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