Handler+Thread和HandlerThread的用法比较

Handler+Thread

 package org.crazyit.handler;

 import java.util.ArrayList;
 import java.util.List;

 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.Toast;

 public class CalPrime1 extends Activity
 {
     static final String UPPER_NUM = "upper";
     EditText etNum;

     CalThread calThread;
     // 定义一个线程类
     class CalThread extends Thread
     {
         public Handler mHandler;

         public void run()
         {
             //创建一个Looper对象
             Looper.prepare();
             mHandler = new MyHandler();
             //启动Looper对象
             Looper.loop();
         }
     }

     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         etNum = (EditText)findViewById(R.id.etNum);
         calThread = new CalThread();
         // 启动新线程
         calThread.start();
     }

     public class MyHandler extends Handler{

         @Override
         public void handleMessage(Message msg) {
             super.handleMessage(msg);

             if(msg.what == 0x123)
             {
                 int upper = msg.getData().getInt(UPPER_NUM);
                 List<Integer> nums = new ArrayList<Integer>();
                 // 计算从2开始、到upper的所有质数
                 outer:
                 for (int i = 2 ; i <= upper ; i++)
                 {
                     // 用i处于从2开始、到i的平方根的所有数
                     for (int j = 2 ; j <= Math.sqrt(i) ; j++)
                     {
                         // 如果可以整除，表明这个数不是质数
                         if(i != 2 && i % j == 0)
                         {
                             continue outer;
                         }
                     }
                     nums.add(i);
                 }
                 // 使用Toast显示统计出来的所有质数
                 Toast.makeText(CalPrime1.this , nums.toString()
                     , Toast.LENGTH_LONG).show();
             }
         }
     }

     // 为按钮的点击事件提供事件处理函数
     public void cal(View source)
     {
         // 创建消息
         Message msg = new Message();
         msg.what = 0x123;
         Bundle bundle = new Bundle();
         bundle.putInt(UPPER_NUM ,
             Integer.parseInt(etNum.getText().toString()));
         msg.setData(bundle);
         // 向新线程中的Handler发送消息
         calThread.mHandler.sendMessage(msg);
     }
 }

HandlerThread

 package org.crazyit.handler;

 import java.util.ArrayList;
 import java.util.List;

 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
 import android.os.Message;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.Toast;

 /**
  * Description:
  * <br/>website: <a href="http://www.crazyit.org">crazyit.org</a>
  * <br/>Copyright (C), 2001-2014, Yeeku.H.Lee
  * <br/>This program is protected by copyright laws.
  * <br/>Program Name:
  * <br/>Date:
  * @author Yeeku.H.Lee [email protected]
  * @version 1.0
  */
 public class CalPrime extends Activity
 {
     static final String UPPER_NUM = "upper";
     EditText etNum;

     Handler mHandler;

     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         etNum = (EditText)findViewById(R.id.etNum);

         HandlerThread handlerThread = new HandlerThread("SOHU");
         handlerThread.start();

         mHandler = new MyHandler(handlerThread.getLooper());
     }

     public class MyHandler extends Handler{

         public MyHandler(){
             super();
         }

         public MyHandler(Looper looper){
             super(looper);
         }

         @Override
         public void handleMessage(Message msg) {
             super.handleMessage(msg);

             if(msg.what == 0x123)
             {
                 int upper = msg.getData().getInt(UPPER_NUM);
                 List<Integer> nums = new ArrayList<Integer>();
                 // 计算从2开始、到upper的所有质数
                 outer:
                 for (int i = 2 ; i <= upper ; i++)
                 {
                     // 用i处于从2开始、到i的平方根的所有数
                     for (int j = 2 ; j <= Math.sqrt(i) ; j++)
                     {
                         // 如果可以整除，表明这个数不是质数
                         if(i != 2 && i % j == 0)
                         {
                             continue outer;
                         }
                     }
                     nums.add(i);
                 }
                 // 使用Toast显示统计出来的所有质数
                 Toast.makeText(CalPrime.this , nums.toString()
                     , Toast.LENGTH_LONG).show();
             }
         }
     }

     // 为按钮的点击事件提供事件处理函数
     public void cal(View source)
     {
         // 创建消息
         Message msg = new Message();
         msg.what = 0x123;
         Bundle bundle = new Bundle();
         bundle.putInt(UPPER_NUM ,
             Integer.parseInt(etNum.getText().toString()));
         msg.setData(bundle);
         // 向新线程中的Handler发送消息
         mHandler.sendMessage(msg);
     }
 }