Android Timer Schedule

Question

Following is the code snippet which I am using in my project to schedule a task

mTimer = new Timer();
mTimer.schedule(new TimerTask() {

 @Override
 public void run() {
  //Do Something
 }

}, interval, interval);

This works fine. I get event after mentioned interval. But this fails to send any event if date is set smaller than current from settings.

Does any one know why this behavior is happening?

if timer is set and date is changed from settings to lower than current date, it fails to give callback — Neji, Jan 07 '16 at 05:16
but why a timer should run for lower than current date?? Why not you just disable selection of date less than current date? — Vivek Mishra, Jan 07 '16 at 05:17
i did mention settings in my comment above and now have added in question as well — Neji, Jan 07 '16 at 05:29
One thing I suggest that you should get current date using system settings. In that case if system date changes it will also change for your code — Vivek Mishra, Jan 07 '16 at 05:55

Kevin Krumwiede · Accepted Answer · 2016-01-11T07:57:18.800

7

Timer fails when you change the system clock because it's based on System.currentTimeMillis(), which is not monotonic.

Timer is not an Android class. It's a Java class that exists in the Android API to support existing non-Android libraries. It's almost always a bad idea to use a Timer in your new Android code. Use a Handler for timed events that occur within the lifetime of your app's activities or services. Handler is based on SystemClock.uptimeMillis(), which is monotonic. Use an Alarm for timed events that should occur even if your app is not running.

edited Jan 11 '16 at 07:57

answered Jan 11 '16 at 07:51

Kevin Krumwiede

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Perfect!!, just what i needed. I solved my problem using handler already, but was curious to find what went wrong when used timer in first place! :) – Neji Jan 11 '16 at 09:02

score 0 · Answer 2 · answered Jan 07 '16 at 05:43

Use this code.. this will help you..

Timer t;
seconds = 10;

public void startTimer() {
        t = new Timer();
        //Set the schedule function and rate
        t.scheduleAtFixedRate(new TimerTask() {

            @Override
            public void run() {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        if (seconds == 0) {
                            t.cancel();
                           seconds = 10;
                      // DO SOMETHING HERE AFTER 10 SECONDS
                       Toast.makeText(this,"Time up",Toast.LENGTH_SHORT).show();
                        }
                        seconds -= 1;
                    }
                });
            }
        }, 0, 1000);
    }

i need reason why it is not working when i am changing date to lower than current — Neji, Jan 11 '16 at 07:16

Android Timer Schedule

2 Answers2