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You can declare your own service to perform long running operations without user interaction or to supply functionality to other applications. A activity can start a service via the startService() method and stop the service via the stopService() method. If the activity want to interact with the service it can use the bindService() method of the service. This requires an "ServiceConnection" object which allows to connect to the service and which return a IBinder object. This IBinder object can be used by the activity to communicate with the service.

Once a service is started its onCreate() method is called. Afterwards the onStartCommand() is called with the Intent data provided by the activity. startService also allows to provide a flag with determines the lifecycle behavior of the services. START_STICKY is used for services which are explicit started or stopped. Services started with START_NOT_STICKY will end automatically after the onStartCommand() method is done. A service is started within the main thread of the application therefore all long running tasks should be performed in the background .

A Services needs to be declared in the "AndroidManifest.xml" via a and the implementing class must extend the class "Service" or one of its subclasses.



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