Android application model

© Frank Mueller & Seokyong Hong (TA) North Carolina State University Center for Efficient, Secure and Reliable Computing Android Application Model (3) Except as otherwise noted, the content of this presentation is licensed under the Creative Commons Attribution 2.5 License.

Android Application Package ,[object Object],[object Object],.apk Java Code Data Files Resources Files ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Application Components ,[object Object],[object Object],[object Object],Components Description Activity UI component typically corresponding to one screen Service Background process without UI Broadcast Receiver Component that responds to broadcast Intents Content Provider Component that enables applications to share data

Components - Activity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Components - Activity (Cont) ,[object Object],[object Object]

Components - Service ,[object Object],[object Object],[object Object],[object Object],[object Object],Media Player Activity Service Background running for playback Binder Notification Communication Pause/rewind /stop/restart

Components - Service (Cont) ,[object Object]

Components - Broadcast Receivers ,[object Object],[object Object],[object Object],SMS Broadcast Receiver Activity ,[object Object],[object Object]

Components - Broadcast Receivers (Cont) ,[object Object],[object Object],[object Object],[object Object]

Components - Content Providers ,[object Object],[object Object],Activity Application Activity Application Activity Content Provider Service Application Data SQLite XML Remote Store Content Resolver Content Resolver Content Resolver

Components - Content Providers (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Intents ,[object Object],[object Object],[object Object],startActivity(new Intent(Intent.VIEW_ACTION, Uri.parse("http://www.fhnw.ch")); startActivity(new Intent(Intent.VIEW_ACTION, Uri.parse("geo:47.480843,8.211293")); startActivity(new Intent(Intent.EDIT_ACTION,Uri.parse("content://contacts/people/1"));

Intents (Cont) ,[object Object],[object Object],[object Object]

Intents (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Android Component Model ,[object Object],[object Object],[object Object],[object Object],[object Object],Application (.apk) Process Activity Activity Activity Activity Content Provider Service Service

Activities and Tasks ,[object Object],Activity Activity Context.startActivity(Intent) or Activity.startActivityForResult (Intent, Request_Code) ① Asynchronous Message (Intent) ② To get some result (e.g. to get a photo) No return

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],Application (.apk) Process Activity Activity Activity Activity Content Provider Service Service Application (.apk) Process Activity Activity Activity Activity Content Provider Service Service

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],[object Object],Instance of Activity B Instance of Activity C Instance of Activity B Instance of Activity A A Stack The one that began the task (typically, an activity the user selected in the application launcher) The one that's currently running

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],[object Object]

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],New Activity Activity A Root Activity Original Task Activity A Root Activity Original Task New Activity New Task standard/singleTop without FLAG_ACTIVITY_NEW_TASK singleTask/singleInstance

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],Activity B Activity A Task A Activity D Task B Activity B and Activity C are standard/singleTop Activity C Activity B Activity C Activity B Activity A Task A Activity C Task B Activity C is singleTask or singleInstance

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],"standard" ,[object Object],[object Object],"singleTop" "singleTask" "singleInstance" ,[object Object]

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],Activity B Activity A Activity C Original Task Activity D An intent arrives for an activity of type D Activity B Activity A Activity C Activity D Activity D If D is"standard" Activity B Activity A Activity C Activity D If D is"singleTop" The existing instance D is expected to handle the new intent (since it's at the top of the stack)

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],Activity B Activity A Activity C Original Task Activity D An intent arrives for an activity of type B Activity B Activity A Activity C Activity D If B is"standard" Activity B Activity A Activity C Activity D If B is"singleTop" The existing instance B is not expected to handle the new intent (since it's not at the top of the stack) Activity B Activity B

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],Activity B Original Task An intent arrives for an activity of type B If B is"singleInstance" A "singleInstance" activity is always at the top of the stack, so it is always in position to handle the intent. Activity B

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],Activity B Original Task An intent arrives for an activity of type B If B is"singleTask" Activity B can handle the intent since it is in position. Activity B Activity A Activity A Activity B Original Task An intent arrives for an activity of type B If B is"singleTask" Activity B cannot handle the intent since it is not in position and the intent is dropped. Activity B Activity A Activity A

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Activities and Tasks (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Activities and Tasks (Cont) ,[object Object],[object Object]

Processes and Threads ,[object Object],[object Object],[object Object],Application (.apk) Process Main Thread 1 1

Processes and Threads (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Processes and Threads (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Component Lifecycles ,[object Object],[object Object],[object Object],[object Object],[object Object],State Description Running ,[object Object],Paused ,[object Object],Stopped ,[object Object],[object Object]

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

Component Lifecycles (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Component Lifecycles (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Component Lifecycles (Cont) ,[object Object]

Component Lifecycles (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Component Lifecycles (Cont) ,[object Object],[object Object],[object Object]

Component Lifecycles (Cont) ,[object Object],[object Object]

Android application model

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