Android(安卓)的消息机制(3)
16lz
2022-07-26
当然我们也可以隐式的指定Looper ,代码如下:
?[Copy to clipboard] Download zuiniuwang.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。
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