Example: Communication between Activity and Service using Messaging
Look at the LocalService example.
Your Service
returns an instance of itself to consumers who call onBind
. Then you can directly interact with the service, e.g. registering your own listener interface with the service, so that you can get callbacks.
For sending data to a service you can use:
Intent intent = new Intent(getApplicationContext(), YourService.class);intent.putExtra("SomeData","ItValue");startService(intent);
And after in service in onStartCommand() get data from intent.
For sending data or event from a service to an application (for one or more activities):
private void sendBroadcastMessage(String intentFilterName, int arg1, String extraKey) { Intent intent = new Intent(intentFilterName); if (arg1 != -1 && extraKey != null) { intent.putExtra(extraKey, arg1); } sendBroadcast(intent);}
This method is calling from your service. You can simply send data for your Activity.
private void someTaskInYourService(){ //For example you downloading from server 1000 files for(int i = 0; i < 1000; i++) { Thread.sleep(5000) // 5 seconds. Catch in try-catch block sendBroadCastMessage(Events.UPDATE_DOWNLOADING_PROGRESSBAR, i,0,"up_download_progress"); }
For receiving an event with data, create and register method registerBroadcastReceivers() in your activity:
private void registerBroadcastReceivers(){ broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { int arg1 = intent.getIntExtra("up_download_progress",0); progressBar.setProgress(arg1); } }; IntentFilter progressfilter = new IntentFilter(Events.UPDATE_DOWNLOADING_PROGRESS); registerReceiver(broadcastReceiver,progressfilter);
For sending more data, you can modify method sendBroadcastMessage();
. Remember: you must register broadcasts in onResume() & unregister in onStop() methods!
UPDATE
Please don't use my type of communication between Activity & Service.This is the wrong way.For a better experience please use special libs, such us:
1) EventBus from greenrobot
2) Otto from Square Inc
P.S. I'm only using EventBus from greenrobot in my projects,
Note: You don't need to check if your service is running, CheckIfServiceIsRunning()
, because bindService()
will start it if it isn't running.
Also: if you rotate the phone you don't want it to bindService()
again, because onCreate()
will be called again. Be sure to define onConfigurationChanged()
to prevent this.