在项目开发中，经常需要通过延时加载来实现满足我们的项目要求。那到底怎样来实现延时，下面结合java与android的相关方法来实现延时问题。
一.利用线程的Sleep方法
<span style="font-family:Microsoft YaHei;font-size:18px;"><span style="white-space:pre"> </span>new Thread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
try {
Thread.sleep(1000);
myHandler.sendEmptyMessage(what);//处理主线程方法
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});</span>
二. 利用Timer和TimerTask延时器
<span style="font-family:Microsoft YaHei;font-size:18px;"><span style="white-space:pre"> </span>// 1.实例化Timer
Timer timer = new Timer();
// 2.实例化TimerTask
TimerTask timerTask = new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
}
};
// 3.启动定时器
/**
* task: the task to schedule.
* delay: amount of time in milliseconds before first execution.
* period: amount of time in milliseconds between subsequent executions
*/
timer.schedule(timerTask, delay, period);
// 4.关闭定时器
if (timerTask != null) {
timerTask.cancel();
timerTask = null;
}
// 5.重新开启定时器,需要重新实例化
timerTask = new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
}
};
timer.schedule(timerTask, delay, period);</span>
3.利用android自带的Handler消息处理
<span style="font-family:Microsoft YaHei;font-size:18px;"> /**
* delayMillis:The delay (in milliseconds) until the Runnable will be executed.
*/
new Handler().postDelayed(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
}
}, delayMillis);</span>
4.SchduleExecutorService接口处理延时 迭代
<span style="font-family:Microsoft YaHei;font-size:18px;"><span style="white-space:pre"> </span>/**
* ScheduledExecutorService提供了按时间安排执行任务的功能，它提供的方法主要有：
* schedule(task,initDelay):安排所提交的Callable或Runnable任务在initDelay指定的时间后执行。
* scheduleAtFixedRate()：安排所提交的Runnable任务按指定的间隔重复执行
* scheduleWithFixedDelay()：安排所提交的Runnable任务在每次执行完后，等待delay所指定的时间后重复执行。
*
* initialDelay: the time to delay first execution
* period: the period between successive executions
* unit: the time unit of the initialDelay and period parameters
*/
//1.实例化
ScheduledExecutorService schedule = Executors.newScheduledThreadPool(2);
//2.开启定时 循环迭代处理
schedule.scheduleAtFixedRate(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
}
}, initialDelay, period, unit);
//3.关闭
if(schedule != null){
schedule.shutdown();
schedule = null;
}</span>