Android Activity and service communication

First, when acitivity and service are in the same application and process, they are implemented by inheriting the binder class.

When an Activity is bound to a service , it is responsible for maintaining a reference to the service instance, allowing you to make some method calls to the running service. For example, if you have a background music service in the background, you can use this method to communicate.

The code is as follows:

/*************************service Code ****************************************/ Public classLocalServiceextendsService {Private FinalIBinder Binder =NewLocalbinder ();  Public classLocalbinderextendsBinder {LocalService getService () {returnLocalService. This; }      }         Publicibinder onbind (Intent Intent) {returnBinder; }  }  /*****************************activity Code *************************************/ Public classBindingactivityextendsActivity {LocalService LocalService; PrivateServiceconnection mconnection =Newserviceconnection () { Public voidonserviceconnected (componentname classname,ibinder localbinder) {LocalService=(Localbinder) localbinder.getservice (); }           Public voidonservicedisconnected (componentname arg0) {LocalService=NULL;     }      }; protected voidOnStart () {Super. OnStart (); Intent Intent=NewIntent ( This, LocalService.class);      Bindservice (Intent, mconnection, context.bind_auto_create); }        protected voidOnStop () {Super. OnStop ();      Unbindservice (mconnection); }        Public voidprintrandomnumber{intnum =Localservice.getrandomnumber ();    SYSTEM.OUT.PRINTLN (num); }}

Code Explanation:

Start service using Context.bindservice () Experience: Context.bindservice ()->oncreate ()->onbind ()->service running Onunbind (), OnDestroy ()->service stop

ActivityAble to bind thanks toServiceThe interface Onbind ().ServiceAndActivityThe connection of the serviceconnectionserviceconnectiononserviceconnected onservicedisconnected Execute the binding, call bindservice intent (explicit or implicit) and a instance. Once the connection is established, you will be able to access the service instance reference. once service object found,

Android Activity and service communication