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Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation
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Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

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Page 1: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Lifecycle Management AndroidMobile and Ubiquitous Games ICS 163 Donald J. Patterson

Android documentation

http://developer.android.com/training/basics/activity-lifecycle/index.html
Page 2: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Callback

http://en.wikipedia.org/wiki/Observer_pattern

http://en.wikipedia.org/wiki/Observer_pattern
Page 3: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

• Unlike traditional Java, Android does not use a “main” function

• It uses a sophisticated set of callbacks

• Each step of the callback corresponds to a step in the lifecycle

of the app

• This is so that the phone can shut your app down when

important things happen, like a phone calls arriving or when a

user switches apps

• An implementation of the Activity class contains the callbacks

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 4: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Callback

http://en.wikipedia.org/wiki/Observer_patternhttp://en.wikipedia.org/wiki/Observer_pattern

Activity Class

http://en.wikipedia.org/wiki/Observer_pattern
http://en.wikipedia.org/wiki/Observer_pattern
Page 5: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Callback

http://en.wikipedia.org/wiki/Observer_patternhttp://en.wikipedia.org/wiki/Observer_pattern

Your Activity

http://en.wikipedia.org/wiki/Observer_pattern
http://en.wikipedia.org/wiki/Observer_pattern
Page 6: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Callback

http://en.wikipedia.org/wiki/Observer_patternhttp://en.wikipedia.org/wiki/Observer_pattern

Android OS

http://en.wikipedia.org/wiki/Observer_pattern
http://en.wikipedia.org/wiki/Observer_pattern
Page 7: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Lifecycle Management

Page 8: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

• Key loops

• Entire Lifetime

• onCreate()- onDestroy()

“+notify()”

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 9: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

• Key loops

• Visible Lifetime

• onStart() - onStop()

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 10: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

• Key loops

• Foreground Lifetime

• onResume() - onPause()

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 11: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

• onPause() may be followed by kill

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 12: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

• Does not crash if the user receives a phone call or switches to another app while

using your app.

• Does not consume valuable system resources when the user is not actively using it.

• Does not lose the user's progress if they leave your app and return to it at a later time.

• Does not crash or lose the user's progress when the screen rotates between

landscape and portrait orientation.

Why do you care? So that your app …

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 13: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Stack

Page 14: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 15: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 16: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 17: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 18: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 19: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 20: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 21: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 22: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 23: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 24: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 25: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 26: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 27: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 28: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 29: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 30: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 31: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 32: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 33: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 34: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 35: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 36: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 37: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 38: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 39: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

Activity Lifecycle

Page 40: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

The Manifest

Page 41: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

The Manifest

http://developer.android.com/training/basics/activity-lifecycle/starting.html

http://developer.android.com/training/basics/activity-lifecycle/starting.html
Page 42: Lifecycle Managementdjp3/classes/2015_03_ICS163/Lectures/Lec… · Lifecycle Management Android Mobile and Ubiquitous Games ICS 163 Donald J. Patterson Android documentation

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