iOS Application Lifecycle
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This document discusses application lifecycles on Android and iOS. It describes the different states that applications can be in, including active, paused, stopped, etc. It outlines the callback methods that allow applications to respond to state transitions on both platforms. Specifically for Android, it details the lifecycle methods for activities, services, broadcast receivers, and content providers. It also covers the process for selecting which applications to remove from memory on Android when it is running low. For iOS, it outlines the application lifecycle events notified through the application delegate.
iOS Application Lifecycle
- 2. Application lifecycles Applications and processes may transition between several states active paused stopped inactive suspended Callback methods allow applications to prepare for and respond to transitions
- 3. Android lifecycle methods Lifecycle state transitions trigger event callback methods Callback events differ based on type of component Callback methods take place in foreground and should be brief
- 4. Android Activity Activity. Activity. Activity. Activity. Activity. Activity. onRestore onSave onStart onResume onPause onStop InstanceState InstanceState Activity. Activity. onCreate onDestroy Activity. onRestart Active lifetime Visible lifetime Full lifetime Application is killable
- 5. Activity callback methods Implementation of lifecycle method should always first call superclass protected void onPause() { super.onPause(); . . . }
- 6. Activity transition Activity A Activity B ActivityA. onPause ActivityB. onCreate ActivityB. onStart ActivityB. onResume ActivityA. onStop
- 7. Android Service Service. Service. Service. onCreate onStartCommand onDestroy Service. Service. onBind onUnbind Service. onRebind
- 8. Service binding methods Activity Service bindService() .onBind() ServiceConnection. onServiceConnected unbindService() .onUnbind() ServiceConnection. onServiceDisconnected
- 9. Android BroadcastReceiver BroadcastReceiver. onReceive Only active while handling onReceive() method
- 10. Android ContentProvider ContentProvider. onCreate Only active while handling methods supporting ContentResolver query() insert() update() delete() getType()
- 11. Processes and lifecycles Old processes removed when memory runs low Selection base on importance hierarchy 1. Foreground process 2. Visible process 3. Service process 4. Background process 5. Empty process
- 12. iOS Application lifecycle UIApplication notified of state transition events Handled by application delegate application:didFinishLaunchingWithOptions: applicationDidBecomeActive: applicationWillResignActive: applicationDidEnterBackground: applicationWillEnterForeground: applicationWillTerminate:
- 13. Pre – iOS 4 application:didFinishLaunchingWithOptions: applicationDidBecomeActive: Active applicationWillTerminate:
- 15. iOS Transition to background
- 16. iOS Return to foreground
- 17. iOS Interruption handling UIKit Delegate Active Phone, SMS, or Calendar applicationWillResignActive: notification arrives Ignore Yes applicationDidBecomeActive: ? No Application moves to applicationDidEnterBackground: background
- 18. iOS 4 Application lifecycle application:didFinishLaunchingWithOptions: applicationDidBecomeActive: Ignore interrupt Active applicationWillEnterForeground: applicationWillResignActive: applicationDidEnterBackground: Suspended applicationWillTerminate:
- 19. Reminder Proposal due Wednesday