package org.hualang.handler;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;public class HandlerTest extends Activity {private Button mybutton1;private Button mybutton2;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);mybutton1 = (Button)findViewById(R.id.mybutton1);mybutton2 = (Button)findViewById(R.id.mybutton2);mybutton1.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View arg0) {/*** 调用Handler的post方法，将要执行的线程对象添加到* 线程队列中*/handler.post(updateThread);}});mybutton2.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {// TODO Auto-generated method stub
                handler.removeCallbacks(updateThread);}});  }//创建Handler对象Handler handler = new Handler();/*** 将要执行的操作卸载写入线程对象的run()方法当中*/Runnable updateThread = new Runnable(){public void run(){System.out.println("更新线程");//在run方法内部，执行postXX的方法，每隔3秒会执行一次handler.postDelayed(updateThread, 3000);}};
}

public void run(){System.out.println("更新线程");//在run方法内部，执行postXX的方法，每隔3秒会执行一次handler.postDelayed(updateThread, 3000);}

package org.hualang.handlertest2;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;public class HandlerTest2 extends Activity {private ProgressBar bar = null;private Button start = null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);bar = (ProgressBar)findViewById(R.id.progress1);start = (Button)findViewById(R.id.start);start.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {bar.setVisibility(View.VISIBLE);handler.post(handlerThread);}});}/*** 使用匿名内部类来复写hanlder当中的hanldrMessage方法* 这里的msg对象就是从线程部分发送过来的对象*/Handler handler = new Handler(){public void handleMessage(Message msg){bar.setProgress(msg.arg1);handler.post(handlerThread);}};//线程类，该类使用的是匿名内部类的方式进行声明Runnable handlerThread = new Runnable(){int i = 0;public void run(){System.out.println("开始线程");i = i + 10;/*** 得到一个消息对象，Message类是由android操作系统提供* obtainMessage方法用来得到Message对象*/Message msg = handler.obtainMessage();/*** Message中有个成员变量，即msg独享的arg1参数* 将其值设置为i。用arg1或arg2这两个成员变量传递* 消息，优点是系统性能消耗较少*/msg.arg1 = i;try {//当前线程休眠1秒Thread.sleep(5000);} catch (InterruptedException e) {// TODO Auto-generated catch block
                e.printStackTrace();}/*** 发送一个消息，用sendMessage是将msg加入到消息* 队列中。而post是将线程加入到线程队列中*/handler.sendMessage(msg);if( i == 100){/*** 如果i=100的时候，就将线程对象* 从handler当中移除*/handler.removeCallbacks(handlerThread);bar.setVisibility(View.GONE);}}};
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent">
<ProgressBarandroid:id="@+id/progress1"android:layout_width="fill_parent"android:layout_height="wrap_content"android:visibility="gone"style="?android:attr/progressBarStyleHorizontal"
/>
<Buttonandroid:id="@+id/start"android:layout_width="wrap_content"android:layout_height="wrap_content"android:gravity="center"android:text="点击我"
/>
</LinearLayout>

bar.setVisibility(View.VISIBLE);
handler.post(handlerThread);

Handler handler = new Handler(){public void handleMessage(Message msg){bar.setProgress(msg.arg1);handler.post(handlerThread);}};