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START_REDELIVER_INTENT : If service is killed while starting, it will schedule to restart with latest intent. START_NOT_STICKY : If service is killed while starting, it does not restart until explicitly service is started. START_STICKY : It starts the onStartCommand if killed while stating. StopSelfResult(int startId): Stops the service for the most recent start id.įind some constants which are returned from onStartCommand(Intent, int, int). StopSelf(): On calling it, Service is stopped if it is running. Service can stop itself by calling methods as follows. We can use it for resource cleanup purpose. OnDestroy(): System calls it when service is completed or stopped. It returns null if clients can not bind to service. OnBind(Intent): It is used for inter process communication(IPC). For every service start call, it is called. OnStartCommand(Intent intent, int flags, int startId) : System calls it when service is started explicitly. We can use it to initialize values for process. OnCreate() : System calls it when service is first created. While using Service we need to override methods. It will run in background even if the user switches to another application.

In our example we will provide a demo to start and stop service from Activity and service will log a message after every second while running in background.Ī runs the long running process in background. Android provides HandlerThread class to start a thread with Looper. Service starts a new thread to run in background. Service can be started and stopped from Activity using startService(intent) and stopService(intent) respectively by passing Intent. Normally service does not return result to starting application.

If starting application switches to another application, still our service is running in background. The use of service is to run long operation like downloading content. Service runs in background and does not interact with user interface. On this page, we will walk through Android start and stop Service from Activity using HandlerThread.