Android uses Messenger to implement service and activity interactions _android

Service interacts with the activity in a variety of ways, and here is the use of Messenger to achieve the interaction between the two.

Service procedure:

public class Messengerservice extends Service {

 final messenger Mmessenger = new Messenger (new Incominghandler ()); 
    @Override public
 ibinder onbind (Intent Intent) {return
  mmessenger.getbinder ();
 }

 @SuppressLint ("Handlerleak")
 class Incominghandler extends Handler {

  @Override public
  Void Handlemessage (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.javal:

public class Mainactivity extends activity {private Messenger Mmessenger;
 Private Serviceconnection Conn;

 Private Intent Intent;
  @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
  Setcontentview (R.layout.activity_main);
  Intent = new Intent (This,messengerservice.class);  conn = new Serviceconnection () {@Override public void onservicedisconnected (componentname name) {Mmessenger =
   Null @Override public void onserviceconnected (componentname name, IBinder service) {Mmessenger = new Messenger (SE
   Rvice);
 }
  };
  } @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) {msg = null;
   Switch (V.getid ()) {Case r.id.button1:msg = Message.obtain (null, 0, 0, 0);
   try {mmessenger.send (msg); catch (RemoteexCeption e) {e.printstacktrace ();
  } break;
   Case r.id.button01:msg = Message.obtain (null, 1, 0, 0);
   try {mmessenger.send (msg);
   catch (RemoteException e) {e.printstacktrace ();
  } break;
  Default:break;
 }
 }
}

Original link: http://blog.csdn.net/u012702547/article/details/46989417

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