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Krishan14sharma/ActivityLifecycle.md

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Created May 24, 2016 06:46
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Notes about Android Activity lifecycle method ordering
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ActivityLifecycle.md

Results of some experiments to determine which Activity lifecycle methods get called in certain situations.

Scenario: Launch app from home, then return home

Launch:

  • activity.onCreate()
  • activity.onStart()
  • activity.onResume()
  • activity.onWindowFocusChanged(true)

Note: Launching already-running app is similar, except a call to activity.onRestart() will occur instead of onCreate().

Press Home:

  • activity.onUserInteraction()
  • activity.onUserLeaveHint()
  • activity.onPause()
  • activity.onWindowFocusChanged(false)
  • activity.onSaveInstanceState()
  • activity.onStop(); isChangingConfigurations() returns false

Scenario: App pushes new activity onto stack

(activity1 is the activity that was on the top of the stack. activity2 is the new activity being pushed on top.)

  • activity1.onPause()
  • activity2.onCreate()
  • activity2.onStart()
  • activity2.onResume()
  • activity1.onWindowFocusChanged(false)
  • activity2.onWindowFocusChanged(true)
  • activity1.onSaveInstanceState()
  • activity1.onStop(); isChangingConfigurations() returns false

If activity1 calls finish(), then activity1.onDestroy() will occur after onStop()

Scenario: User presses Back button to dismiss activity and reveal previous activity

(activity2 is the top-of-stack activity being dismissed. activity1 is the activity that is beneath activity2.)

  • activity2.onUserInteraction()
  • activity2.onPause()
  • activity1.onRestart()
  • activity1.onStart()
  • activity1.onResume()
  • activity1.onWindowFocusChanged(true)
  • activity2.onWindowFocusChanged(false)
  • activity2.onStop()
  • activity2.onDestroy()

Scenario: Orientation change in activity that does not implement onConfigurationChanged()

  • activity.onConfigurationChanged()

Scenario: Orientation change in activity that does implement onConfigurationChanged()

  • activity.onPause()
  • activity.onSaveInstanceState()
  • activity.onStop(); isChangingConfigurations() returns true
  • activity.onDestroy()
  • activity.onCreate()
  • activity.onStart()
  • activity.onRestoreInstanceState()
  • activity.onResume()
  • activity.onWindowFocusChanged(true)
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