Android Timer，TimerTask简单的使用

 private void init() {
        mTimer = new Timer();
        mTimerTask = new TimerTask() {
            @Override
            public void run() {
                //System.out.println("---> count=" + count);
            	DoTask() ;
            	//tView.setText(buff.toString()) ;
            	count++ ;
                if (count == -1) {
                    mTimer.cancel();
                }
            }
            
        };
        //开始一个定时任务
        mTimer.schedule(mTimerTask, 2000,4000);
    }
 
  
 
  
 mTimer.schedule(mTimerTask, 2000,4000);中第一个参数是自定义的一个TimerTask对象，对其的run方法实现我们要循环调用的代码。第二个参数是延时多少毫秒开始使用，第三个参数表示，间隔多少毫秒去调用一次。
完整的一个代码，实现的去调用本地服务器上的一个csv文件。
java文件
package com.example.getcsvtest;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class ScvTestActivity extends Activity {

	private int count = 0 ;
	private Timer mTimer;
    private TimerTask mTimerTask;
	private TextView tView ;
	public StringBuffer buff = new StringBuffer() ;
	//private	MyAsyncTask myAsyncTask ;
	private Handler handler = new Handler(){
		public void handleMessage(Message msg){
			tView.setText(buff.toString()+count) ;
		}
		
	};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scv_test);
        
        tView = (TextView) findViewById(R.id.TVIEW_ID) ;
        init() ;
 
    }

    
    private void init() {
        mTimer = new Timer();
        mTimerTask = new TimerTask() {
            @Override
            public void run() {
                //System.out.println("---> count=" + count);
            	DoTask() ;
            	//tView.setText(buff.toString()) ;
            	count++ ;
                if (count == -1) {
                    mTimer.cancel();
                }
            }
            
        };
        //开始一个定时任务
        mTimer.schedule(mTimerTask, 2000,4000);
    }
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.scv_test, menu);
        return true;
    }


    
    
    public void DoTask(){
    	new Thread(new Runnable() {		
			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					URL url =new URL("http://10.0.2.2/1.csv") ;
					HttpURLConnection connection =(HttpURLConnection) url.openConnection() ;
					connection.setRequestMethod("GET") ;
					connection.setConnectTimeout(8000) ;
					connection.setReadTimeout(8000) ;
					InputStream inStream = connection.getInputStream() ;
					BufferedReader reader = new BufferedReader(new InputStreamReader(inStream,"GB2312")) ;
					String line = null;
					int x = 0 ;
					buff.setLength(0);
					while((line=reader.readLine())!=null && x <3){
							System.out.println(line);
							String item[] = line.split(",");
							x++ ;
							buff.append("时间："+item[0]+",溶解氧: "+item[1]) ;
							buff.append("\n") ;
					}
					Message msg = new Message() ;
					handler.sendMessage(msg) ;
				} catch (Exception e) {
					// TODO: handle exception
					e.printStackTrace() ;
				}
			}
		}).start() ;
    }
    
    
}
Xml布局文件 
  
 
  
 
  


    
    


 
  
 Xml的配置文件要上