IPC mechanism uses Messenger for interprocess communication

The Messenger class can pass Messge objects in different processes for data communication

Messenger is a lightweight IPC solution that encapsulates the aidl.

Steps:

1. Create the Messenger object in the service's Onbind () method, and associate the handler

 PrivateHandler Mhandler =NewHandler () {@Override Public voidhandlemessage (Message msg) {Switch(msg.what) { Casemsg_fromclient:log.i (TAG,"Received client information-------" +msg.getdata (). Get ("MSG"))); //get the Messenger object from the clientMessenger mmessenger=Msg.replyto; Message Mmessage=message.obtain (NULL, messengerservice.msg_fromclient); Bundle Mbundle=NewBundle (); Mbundle.putstring ("Rep", "Here's the server, we got the message.");                    Mmessage.setdata (Mbundle); Try{mmessenger.send (mmessage); } Catch(RemoteException e) {e.printstacktrace (); }                     Break; }}}; @Override Publicibinder onbind (Intent Intent) {return NewMessenger (Mhandler). Getbinder (); }}
Registering as a remote service android:process= in the manifest file ": Remotes  

2. In the activity

Private New Handler () {        @Override        publicvoid  handlemessage (Message msg) {              Switch  (msg.what) {                case  messengerservice.msg_fromclient:                    " Receive service-side information-------"+ msg.getdata (). Get (" rep "))                    ;  Break ;            }        }    };

PrivateServiceconnection mserviceconnection=Newserviceconnection () {@Override Public voidonserviceconnected (componentname name, IBinder service) {
Create a Messenger object from a IBinder object Mmessenger=NewMessenger (service); Message Mmessage=message.obtain (NULL, messengerservice.msg_fromclient); Bundle Mbundle=NewBundle (); Mbundle.putstring ("MSG", "Here is the client, received the service side");        Mmessage.setdata (Mbundle); //deliver Messenger to the servermmessage.replyto=NewMessenger (Mhandler); Try{mmessenger.send (mmessage); } Catch(RemoteException e) {e.printstacktrace (); }    }

IPC mechanism uses Messenger for interprocess communication