学步园

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 kongyeeku@163.com
 * @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);
	}
}