Android 的消息机制（3）
当然我们也可以隐式的指定Looper ，代码如下： ?[Copy to clipboard] Downloadzuiniuwang.java /** *MessageQueue2.java *com.test * *Function：TODO * *verdateauthor *────────────────────────────────── *2011-3-20Leon * *Copyright(c)2011,TNTAllRightsReserved. */ packagecom.test.messagequeue; /** *ClassName:MessageQueue2 *Function:TODOADDFUNCTION *Reason:TODOADDREASON * *@authorLeon *@version *@sinceVer1.1 *@Date2011-3-20 */ importandroid.app.Activity; importandroid.graphics.Color; importandroid.os.Bundle; importandroid.os.Handler; importandroid.os.Looper; importandroid.os.Message; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.Button; importandroid.widget.LinearLayout; importandroid.widget.TextView; publicclassMessageQueue3extendsActivityimplementsOnClickListener{ privatefinalintWC=LinearLayout.LayoutParams.WRAP_CONTENT; privatefinalintFP=LinearLayout.LayoutParams.FILL_PARENT; publicTextViewtv; privatemyThreadt; privateButtonbtn,btn2,btn3; privateEHandlermHandler; publicvoidonCreate(Bundleicicle){ super.onCreate(icicle); LinearLayoutlayout=newLinearLayout(this); layout.setOrientation(LinearLayout.VERTICAL); btn=newButton(this); btn.setId(101); btn.setText("testlooper"); btn.setOnClickListener(this); LinearLayout.LayoutParamsparam= newLinearLayout.LayoutParams(100,50); param.topMargin=10; layout.addView(btn,param); btn2=newButton(this); btn2.setId(102); btn2.setText("exit"); btn2.setOnClickListener(this); layout.addView(btn2,param); tv=newTextView(this); tv.setTextColor(Color.WHITE); tv.setText(""); LinearLayout.LayoutParamsparam2= newLinearLayout.LayoutParams(FP,WC); param2.topMargin=10; layout.addView(tv,param2); setContentView(layout); } publicvoidonClick(Viewv){ switch(v.getId()){ case101: //mHandler=newEHandler(Looper.myLooper()); //可以隐式的制定Looper,和上面的效果是一样的 mHandler=newEHandler(); t=newmyThread(); t.start(); break; case102: finish(); break; } } //------------------------------------------------------ classEHandlerextendsHandler{ publicEHandler(Looperlooper){ super(looper); } publicEHandler(){ } @Override publicvoidhandleMessage(Messagemsg){ tv.setText((String)msg.obj); } } //------------------------------------------------------ classmyThreadextendsThread{ publicvoidrun(){ Stringobj="Thismessageisfromnewthread."; mHandler.removeMessages(0); Messagem=mHandler.obtainMessage(1,1,1,obj); mHandler.sendMessage(m); } } 在此代码中，指令：h = new EventHandler()；就等于：h = new EventHandler(Looper.myLooper())； 它建立了当前线程(Current Thread)的EventHandler对象。由于是由main线程执行此指令的，所以此EventHandler对象是用来存取main线程的Message Queue的。 本文转自 最牛傻蛋 51CTO博客，原文链接：http://blog.51cto.com/zuiniuwang/718338，如需转载请自行联系原作者
