Android Development uses Messenger to enable service to interact with activity

The service interacts with the activity in a variety of ways, where Messenger is used to achieve the interaction between the two.

Service Program

 Public  class messengerservice extends Service {    FinalMessenger Mmessenger =NewMessenger (NewIncominghandler ()); @Override PublicIBinder Onbind (Intent Intent) {returnMmessenger.getbinder (); } @SuppressLint ("Handlerleak") class incominghandler extends Handler {@Override Public voidHandlemessage (Message msg) {Switch(msg.what) { Case 0: Toast.maketext (Messengerservice. This,"Hello lenve!", Toast.length_long). Show (); Break; Case 1: Toast.maketext (Messengerservice. This,"Hello lenve! Hello world! ", Toast.length_long). Show (); Break;default: Break; }        }    }}

Mainactivity.java

 Public  class mainactivity extends Activity {    PrivateMessenger Mmessenger;PrivateServiceconnection Conn;PrivateIntent Intent;@Override    protected void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main); Intent =NewIntent ( This, Messengerservice.class); conn =NewServiceconnection () {@Override             Public void onservicedisconnected(componentname name) {Mmessenger =NULL; }@Override             Public void onserviceconnected(componentname name, IBinder service) {Mmessenger =NewMessenger (service);    }        }; }@Override    protected void OnStart() {Super. OnStart ();    Bindservice (Intent, Conn, bind_auto_create); }@Override    protected void OnStop() {Super. OnStop ();    Unbindservice (conn); } Public void OnClick(View v) {Message msg =NULL;Switch(V.getid ()) { CaseR.id.button1:msg = Message.obtain (NULL,0,0,0);Try{mmessenger.send (msg); }Catch(RemoteException e)            {E.printstacktrace (); } Break; CaseR.id.button01:msg = Message.obtain (NULL,1,0,0);Try{mmessenger.send (msg); }Catch(RemoteException e)            {E.printstacktrace (); } Break;default: Break; }    }}

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Android Development uses Messenger to enable service to interact with activity