Bind service to activity in Android

Question

I m trying to write a simple media player that plays streaming audio using RTSP  I have a GUI-activity and a service that performs the playback  My question is how to best communicate between the activity and the service  e g  updating the GUI based on the player state    I know that I can bind the service to the activity using onBind    but if I understand correctly this will stop the service if the activity is killed  I want to continue the playback even if the user exits the activity  Is there any standard or preferred way of dealing with this problem

User · Answer

This is a biased answer  but I wrote a library that may simplify the usage of Android Services  if they run locally in the same process as the app  https   github com germnix acacia  Basically you define an interface annotated with  Service and its implementing class  and the library creates and binds the service  handles the connection and the background worker thread    Service ServiceImpl class  public interface MyService       void doProcessing Foo aComplexParam      public class ServiceImpl implements MyService          your implementation    MyService service   Acacia createService context  MyService class   service doProcessing foo     lt application     android icon   mipmap ic launcher      android label   string app name      android theme   style AppTheme  gt               lt service android name  com gmr acacia AcaciaService   gt           lt  application gt    You can get an instance of the associated android app Service to hide show persistent notifications  use your own android app Service and manually handle threading if you wish

User · Answer

First of all  2 thing that we need to understand  Client   it make request to specific server  bindService new      Intent  com android vending billing InAppBillingService BIND            mServiceConn  Context BIND AUTO CREATE       here mServiceConn is instance of ServiceConnection class inbuilt  it is actually interface that we need to implement with two  1st for network connected and 2nd network not connected  method to monitor network connection state   Server   It handle the request of client and make replica of it s own which is private to client only who send request and this replica of server runs on different thread    Now at client side  how to access all the method of server    server send response with IBind Object so IBind object is our handler which access all the method of service by using     operator       MyService myService  public ServiceConnection myConnection   new ServiceConnection         public void onServiceConnected ComponentName className  IBinder binder            Log d  ServiceConnection   connected            myService   binder              binder comes from server to communicate with method s of       public void onServiceDisconnected ComponentName className            Log d  ServiceConnection   disconnected            myService   null             now how to call method which lies in service  myservice serviceMethod      here myService is object and serviceMethode is method in service  And by this way communication is established between client and server

User · Answer

If you start an android Service with startService     that Service will remain running until you explicitly invoke stopService      There are two reasons that a service can be run by the system  If someone calls Context startService   then the system will retrieve the service  creating it and calling its onCreate   method if needed  and then call its onStartCommand Intent  int  int  method with the arguments supplied by the client  The service will at this point continue running until Context stopService   or stopSelf   is called  Note that multiple calls to Context startService   do not nest  though they do result in multiple corresponding calls to onStartCommand     so no matter how many times it is started a service will be stopped once Context stopService   or stopSelf   is called  however  services can use their stopSelf int  method to ensure the service is not stopped until started intents have been processed     Clients can also use Context bindService   to obtain a persistent connection to a service  This likewise creates the service if it is not already running  calling onCreate   while doing so   but does not call onStartCommand    The client will receive the IBinder object that the service returns from its onBind Intent  method  allowing the client to then make calls back to the service  The service will remain running as long as the connection is established  whether or not the client retains a reference on the Service s IBinder   Usually the IBinder returned is for a complex interface that has been written in AIDL   A service can be both started and have connections bound to it  In such a case  the system will keep the service running as long as either it is started or there are one or more connections to it with the Context BIND AUTO CREATE flag  Once neither of these situations hold  the Service s onDestroy   method is called and the service is effectively terminated  All cleanup  stopping threads  unregistering receivers  should be complete upon returning from onDestroy

User · Answer

There is a method called unbindService that will take a ServiceConnection which you will have created upon calling bindService  This will allow you to disconnect from the service while still leaving it running   This may pose a problem when you connect to it again  since you probably don t know whether it s running or not when you start the activity again  so you ll have to consider that in your activity code   Good luck

User · Answer

I tried to call   startService oIntent   bindService oIntent  mConnection  Context BIND AUTO CREATE     consequently and I could create a sticky service and bind to it  Detailed tutorial for Bound Service Example

User · Answer

If the user backs out  the onDestroy   method will be called  This method is to stop any service that is used in the application  So if you want to continue the service even if the user backs out of the application  just erase onDestroy    Hope this help

[android] Bind service to activity in Android

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