Android 三种实现定时器详解及实现方法

package com.xunfang.handerDemo; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.widget.TextView; 
 
/** 
 * handler定时器 
 * 
 * @author Smalt 
 * 
 */ 
public class HanderDemoActivity extends Activity { 
 TextView tvShow; 
 private int i = 0; 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  tvShow = (TextView) findViewById(R.id.tv_show); 
  new Thread(new ThreadShow()).start(); 
 } 
 
 // handler类接收数据 
 Handler handler = new Handler() { 
  public void handleMessage(Message msg) { 
   if (msg.what == 1) { 
    tvShow.setText(Integer.toString(i++)); 
    System.out.println("receive...."); 
   } 
  }; 
 }; 
 
 // 线程类 
 class ThreadShow implements Runnable { 
 
  @Override 
  public void run() { 
   // TODO Auto-generated method stub 
   while (true) { 
    try { 
     Thread.sleep(1000); 
     Message msg = new Message(); 
     msg.what = 1; 
     handler.sendMessage(msg); 
     System.out.println("send..."); 
    } catch (Exception e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     System.out.println("thread error..."); 
    } 
   } 
  } 
 } 
} 

package com.xunfang.handerDemo; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.widget.TextView; 
 
/** 
 * handler定时器使用postDelyed实现 
 * 
 * @author Smalt 
 * 
 */ 
public class HanderDemoActivity extends Activity { 
 TextView tvShow; 
 private int i = 0; 
 private int TIME = 1000; 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  tvShow = (TextView) findViewById(R.id.tv_show); 
  handler.postDelayed(runnable, TIME); //每隔1s执行 
 } 
 
 Handler handler = new Handler(); 
 Runnable runnable = new Runnable() { 
 
  @Override 
  public void run() { 
   // handler自带方法实现定时器 
   try { 
    handler.postDelayed(this, TIME); 
    tvShow.setText(Integer.toString(i++)); 
    System.out.println("do..."); 
   } catch (Exception e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
    System.out.println("exception..."); 
   } 
  } 
 }; 
 
} 

package com.xunfang.handerDemo; 
 
import java.util.Timer; 
import java.util.TimerTask; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.widget.TextView; 
 
/** 
 * 定时器实现:Handler+Timer+TimerTask 
 * 
 * @author Smalt 
 * 
 */ 
public class HanderDemoActivity extends Activity { 
 TextView tvShow; 
 private int i = 0; 
 private int TIME = 1000; 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  tvShow = (TextView) findViewById(R.id.tv_show); 
  timer.schedule(task, 1000, 1000); // 1s后执行task,经过1s再次执行 
 } 
 
 Handler handler = new Handler() { 
  public void handleMessage(Message msg) { 
   if (msg.what == 1) { 
    tvShow.setText(Integer.toString(i++)); 
   } 
   super.handleMessage(msg); 
  }; 
 }; 
 Timer timer = new Timer(); 
 TimerTask task = new TimerTask() { 
 
  @Override 
  public void run() { 
   // 需要做的事:发送消息 
   Message message = new Message(); 
   message.what = 1; 
   handler.sendMessage(message); 
  } 
 }; 
}