Handler a reason why the data in the message queue cannot be removed

The code is as follows:

1  PackageCom.wyl.handler_mars;2 3 Importandroid.app.Activity;4 ImportAndroid.os.Bundle;5 ImportAndroid.os.Handler;6 ImportAndroid.os.Looper;7 ImportAndroid.os.Message;8 ImportAndroid.util.Log;9 ImportAndroid.view.View;Ten ImportAndroid.view.View.OnClickListener; One ImportAndroid.widget.Button; A ImportAndroid.widget.TextView; - ImportAndroid.widget.Toast; - /** the * The main thread sends the message, the worker thread receives the message -  * @authorWyl -  * -  */ +  Public classSecondactivityextendsActivityImplementsonclicklistener{ - Button Btn_fasong; + Handler hand; A Message msg; at TextView TV; - @Override -     protected voidonCreate (Bundle savedinstancestate) { -         //TODO auto-generated Method Stub -         Super. OnCreate (savedinstancestate); - Setcontentview (r.layout.main2); inBtn_fasong =(Button) Findviewbyid (r.id.btn_send); -TV =(TextView) Findviewbyid (r.id.tv_01); toBtn_fasong.setonclicklistener ( This); +Thread T =NewMyThread (); - T.start (); the     } * @Override $      Public voidOnClick (View v) {Panax Notoginseng         //hand = new Handler ();//This line is especially important, if not commented out, then the following thread will not be able to receive the message, because this line of code to regenerate a handler object, also corresponds to a different looper, so there is no -Message msg =hand.obtainmessage (); theMsg.obj = "No words anymore ... "; +System.out.println ("OnClick () ... Send: "+" no words anymore ... "); AHand.sendmessage (msg);//The main thread sends a message the     } +      -      $     classMyThreadextendsthread{ $          - @Override -          Public voidrun () { theLooper.prepare ();//gets a Looper object -System.out.println ("===========");WuyiHand =NewHandler () { the                  - @Override Wu                  Public voidhandlemessage (Message msg) { -                     //TODO auto-generated Method Stub AboutSystem.out.println ("Mythread.run () received the message" + ", the thread:" +Thread.CurrentThread (). GetName ()); $                 } -             }; - Looper.loop (); -         } A          +     } the}

Handler a reason why the data in the message queue cannot be removed