Android中几种常用的定时器和延时方法
通过实际项目的练习,掌握了几种android基本定时器和延时的用法,这里我想总结一下作为自己的收获,下面列出的是比较简洁的模式,方便简单地在程序中直接调用。
一、三种常用的定时器
1.Handler类的postDelayed方法:
1 Handler mHandler = new Handler(); 2 Runnable r = new Runnable() { 3 4 @Override 5 public void run() { 6 //do something 7 //每隔1s循环执行run方法 8 mHandler.postDelayed(this, 1000); 9 } 10 }; 11 12 13 主线程中调用: mHandler.postDelayed(r, 100);//延时100毫秒
2.用handler+timer+timeTask方法:
1 Handler handler = new Handler() { 2 @Override 3 public void handleMessage(Message msg) { 4 if (msg.what == 1){ 5 //do something 6 } 7 super.handleMessage(msg); 8 } 9 }; 10 11 Timer timer = new Timer(); 12 TimerTask timerTask = new TimerTask() { 13 @Override 14 public void run() { 15 Message message = new Message(); 16 message.what = 1; 17 handler.sendMessage(message); 18 } 19 }; 20 主线程中调用:timer.schedule(timerTask,1000,500);//延时1s,每隔500毫秒执行一次run方法
3.Thread+handler方法:
1 Handler handler = new Handler() { 2 @Override 3 public void handleMessage(Message msg) { 4 if (msg.what == 1){ 5 //do something 6 } 7 super.handleMessage(msg); 8 9 } 10 }; 11 12 class MyThread extends Thread {//这里也可用Runnable接口实现 13 @Override 14 public void run() { 15 while (true){ 16 try { 17 Thread.sleep(1000);//每隔1s执行一次 18 Message msg = new Message(); 19 msg.what = 1; 20 handler.sendMessage(msg); 21 } catch (InterruptedException e) { 22 e.printStackTrace(); 23 } 24 25 } 26 } 27 } 28 主线程中调用:new Thread(new MyThread()).start();
二、三种延时的快捷方法:
1.Handler的postDelayed方法:
1 new Handler().postDelayed(new Runnable() { 2 3 @Override 4 public void run() { 5 //do something 6 } 7 }, 1000); //延时1s执行
2.timer + TimerTask方法:
1 timer = new Timer(); 2 timer.schedule(new TimerTask() { 3 @Override 4 public void run() { 5 //do something 6 } 7 },1000);//延时1s执行
3.Thread方法:
1 new Thread(new MyThread()).start(); 2 new Thread(new Runnable() { 3 @Override 4 public void run() { 5 try { 6 Thread.sleep(1000);//延时1s 7 //do something 8 } catch (InterruptedException e) { 9 e.printStackTrace(); 10 } 11 } 12 }).start();
转载地址:http://blog.csdn.net/u011710991/article/details/50133455