增量定时器
我目前正在使用 Timer 和 TimerTask 每 30 秒执行一些工作。
我的问题是，每次完成这项工作后，我想增加计时器的间隔时间。
例如，它在计时器触发之间间隔 30 秒，但我想在间隔中添加 10 秒，以便下次计时器在触发之前需要 40 秒。
这是我以前的代码：
public void StartScanning() {
scanTask = new TimerTask() {
public void run() {
handler.post(new Runnable() {
public void run() {
wifiManager.startScan();
scanCount++;
if(SCAN_INTERVAL_TIME <= SCAN_MAX_INTERVAL){
SCAN_INTERVAL_TIME = SCAN_INTERVAL_TIME + SCAN_INCREASE_INTERVAL;
t.schedule(scanTask, 0, SCAN_INTERVAL_TIME);
}
}
});
}};
Log.d("SCAN_INTERVAL_TIME ** ", "SCAN_INTERVAL_TIME ** = " + SCAN_INTERVAL_TIME);
t.schedule(scanTask, 0, SCAN_INTERVAL_TIME);
}
重构的代码
@Override
public void StartScanning() {
t.schedule(new ScanTask(),SCAN_INTERVAL_TIME);
}
class ScanTask extends TimerTask{
@Override
public void run() {
wifiManager.startScan();
scanCount++;
if(SCAN_INTERVAL_TIME < SCAN_MAX_INTERVAL)
SCAN_INTERVAL_TIME = SCAN_INTERVAL_TIME + SCAN_INCREASE_INTERVAL;
t.schedule(new ScanTask(), SCAN_INTERVAL_TIME);
}
}
它现在可以工作，但是每次创建一个新的 ScanTask() 都是浪费吗？
I'm currently using a Timer and TimerTask to perform some work every 30 seconds.
My problem is that after each time I do this work I want to increment the interval time of the Timer.
So for example it starts off with 30 seconds between the timer firing but I want to add 10 seconds to the interval then so that the next time the Timer takes 40 seconds before it fires.
Here is my previous code:
public void StartScanning() {
scanTask = new TimerTask() {
public void run() {
handler.post(new Runnable() {
public void run() {
wifiManager.startScan();
scanCount++;
if(SCAN_INTERVAL_TIME <= SCAN_MAX_INTERVAL){
SCAN_INTERVAL_TIME = SCAN_INTERVAL_TIME + SCAN_INCREASE_INTERVAL;
t.schedule(scanTask, 0, SCAN_INTERVAL_TIME);
}
}
});
}};
Log.d("SCAN_INTERVAL_TIME ** ", "SCAN_INTERVAL_TIME ** = " + SCAN_INTERVAL_TIME);
t.schedule(scanTask, 0, SCAN_INTERVAL_TIME);
}
REFACTORED CODE
@Override
public void StartScanning() {
t.schedule(new ScanTask(),SCAN_INTERVAL_TIME);
}
class ScanTask extends TimerTask{
@Override
public void run() {
wifiManager.startScan();
scanCount++;
if(SCAN_INTERVAL_TIME < SCAN_MAX_INTERVAL)
SCAN_INTERVAL_TIME = SCAN_INTERVAL_TIME + SCAN_INCREASE_INTERVAL;
t.schedule(new ScanTask(), SCAN_INTERVAL_TIME);
}
}
It works now but is creating a new ScanTask() every time wasteful?
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我的做法如下：
1) 将任务安排为单次执行，而不是重复执行
2) 在执行结束时（可能在finally块中），安排新的单次执行的任务，具有较长的延迟。请注意，您必须创建任务的新实例，否则计时器将发出错误消息 (IllegalStateException)。这意味着您不能再使用匿名内部类。
Here is how I would do it:
1) Schedule the task for a single execution rather than a repeated one
2) At the end of the execution (possibly in a finally block), schedule a new single execution of the task, with a longer delay. Note that you must create a new instance of the task, otherwise the timer will complain (IllegalStateException). That means that you can't use an anonymous inner class anymore.