Activity01.java

package com.yarin.android.Examples_08_03;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Activity01 extends Activity
{
	private final String DEBUG_TAG = "Activity02"; 
	private TextView mTextView;
	private Button mButton;
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		mTextView = (TextView)this.findViewById(R.id.TextView01);
		mButton = (Button)this.findViewById(R.id.Button01);
		mButton.setOnClickListener(new Button.OnClickListener()
	    {
	      @Override
	      public void onClick(View arg0)
	      {
	        // TODO Auto-generated method stub
	    	  refresh();
	      }
	    });
		//�����߳�
		new Thread(mRunnable).start();
	}
	//ˢ����ҳ��ʾ
	private void refresh()
	{
		String httpUrl = "http://192.168.1.110:8080/date.jsp";
		String resultData = "";
		URL url = null;
		try
		{
			// ����һ��URL����
			url = new URL(httpUrl);
		}
		catch (MalformedURLException e)
		{
			Log.e(DEBUG_TAG, "MalformedURLException");
		}
		if (url != null)
		{
			try
			{
				// ʹ��HttpURLConnection������
				HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
				// �õ���ȡ������(��)
				InputStreamReader in = new InputStreamReader(urlConn.getInputStream());
				// �������BufferedReader
				BufferedReader buffer = new BufferedReader(in);
				String inputLine = null;
				// ʹ��ѭ������ȡ��õ�����
				while (((inputLine = buffer.readLine()) != null))
				{
					// ������ÿһ�к������һ��"\n"������
					resultData += inputLine + "\n";
				}
				// �ر�InputStreamReader
				in.close();
				// �ر�http����
				urlConn.disconnect();
				// ������ʾȡ�õ�����
				if (resultData != null)
				{
					mTextView.setText(resultData);
				}
				else
				{
					mTextView.setText("��ȡ������ΪNULL");
				}
			}
			catch (IOException e)
			{
				Log.e(DEBUG_TAG, "IOException");
			}
		}
		else
		{
			Log.e(DEBUG_TAG, "Url NULL");
		}
	}
	  private Runnable mRunnable = new Runnable()
	  {
	    public void run()
	    {
	      while (true)
	      {
	        try
	        {
	          Thread.sleep(5 * 1000);
	          //������Ϣ
	          mHandler.sendMessage(mHandler.obtainMessage());

	        } catch (InterruptedException e)
	        {
	          // TODO Auto-generated catch block
	        	Log.e(DEBUG_TAG, e.toString());
	        }
	      }
	    }
	  };
	  Handler mHandler = new Handler()
	  {
	    public void handleMessage(Message msg)
	    {
	      super.handleMessage(msg);
	      //ˢ��
	      refresh();
	    }
	  };
}