Inside the Android application framework - Google I/O 2009

Inside the Android Application Framework

Managed Component Lifecycles ,[object Object],[object Object],[object Object],[object Object],[object Object]

Basics of an Android Application ,[object Object],[object Object],[object Object]

Activities and Tasks ,[object Object],[object Object],[object Object]

Activities and Tasks APK Package Process ContentProvider Service Activity Activity APK Package Process Activity ContentProvider Process Service Activity

Activities and Tasks APK Package Process Activity ContentProvider Process Service APK Package Process ContentProvider Service Task Activity Activity Activity

Activities Are... ,[object Object],[object Object],[object Object],[object Object],[object Object]

Tasks Are... ,[object Object],[object Object],[object Object],[object Object],[object Object]

Process Basics ,[object Object],[object Object],[object Object],[object Object],* Most

Process Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

More on Activities ,[object Object],[object Object]

The Directed Cyclic Graph of Life ,[object Object],[object Object],[object Object],[object Object]

Activity Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object]

Activity Lifecycle ,[object Object],[object Object],[object Object]

Activity Lifecycle Examples ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example: Child Activity Launched ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],This is the “classic” scenario.

Example: Child Activity + Process Death ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Like the basic case, but onCreate() is called again, with the state saved in onFreeze().

Example: User Hits ’Home’ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Identical to the basic case -- that is, the Home key is not a special case.

Example: finish() Called ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Because the Activity has been explicitly told to quit and is being removed from the task (and history stack), onFreeze() is not called, and onDestroy() is reached.

Example: Dialog Box ,[object Object],[object Object],[object Object],[object Object],Despite appearances, dialog boxes are Views, and not Activities, so they have no effect on the owning Activity’s lifecycle.

Example: Transparent/Non-fullscreen Child ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The new partial-screen window leaves a portion of the previous window visible, so onPause() is followed by onResume() (without onStop()) when the child closes.

Example: Device Goes to Sleep ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The device going to sleep is identical to a non-fullscreen Activity being launched on top.

Threads on Android ,[object Object],[object Object],[object Object]

Threading Overview ,[object Object],[object Object],[object Object]

Threads and Loopers ,[object Object],[object Object],[object Object],[object Object],[object Object]

Threads and Loopers APK Package Process Thread Looper Message Queue Thread External Service Calls Intent Receiver Activity Activity UI Events System Events Local Service Call

Threads and Views ,[object Object],[object Object],[object Object],[object Object]

Threads in Other Contexts ,[object Object],[object Object],[object Object]

Service Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object]

More on Processes ,[object Object],[object Object],[object Object]

Process Resource Management ,[object Object],[object Object],[object Object],[object Object]

Processes & Security ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Inter-Process Communication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why?? ,[object Object],[object Object],[object Object],[object Object]

Process Transparency ,[object Object],[object Object],[object Object],[object Object]

IPC Overview Kernel Process Binder Bundle Intent Receiver Activity Custom Objects Service Parcel Parcelable

Binder in 30 Seconds ,[object Object],[object Object],[object Object],[object Object],[object Object]

IPC - Parcelables ,[object Object],[object Object],[object Object]

IPC - Bundles ,[object Object],[object Object],[object Object],[object Object],[object Object]

IPC - AIDL ,[object Object],[object Object],[object Object],[object Object]

Wrapping Up ,[object Object],[object Object],[object Object]

Inside the Android application framework - Google I/O 2009

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Inside the Android application framework - Google I/O 2009

Editor's Notes