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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();
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