Android 三种实现定时器详解及实现方法

方法一:handler+thread

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..."); 
    } 
   } 
  } 
 } 
} 

方法二:handler类自带的postdelyed

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..."); 
   } 
  } 
 }; 
 
} 

方法三:handler+timer+timertask

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); 
  } 
 }; 
} 

以上就是对android 定时器的资料整理后续继续补充相关知识，谢谢大家对本站的支持！