Cancelling a scheduled task?

Support
1

I want to run “lastTask” 3 seconds after the last time a function “cTG” is called. Here is an example:

public fun cTG(counter: Int) {
// do some things here
        Timer("lastTask").cancel()
        Timer("lastTask", false).schedule(3000)
        {
            lastTask(counter)
        }
    }

The code runs, but it doesn’t seem to be cancelling the previously scheduled “lastTask”. In other words, I have a whole bunch of "lastTask"s showing up instead of just one.

1 Like
2

Hello,

In pasted code, you create a new Timer each time you cal cTG method. In fact, the name passed at built is not a unique identifier used by the system to find previously used tasks, but simply a label to help debug.

You should reuse the same Timer instance if you want control over scheduled tasks. Anyway, a Timer instance is costly because according to javadoc, each instance pops its own thread.

To cancel a task, you have to get the TimerTask returned by schedule method, then call cancel on this object.

For further details, I redirect you to:

  1. Java Timer api doc regarding Timer usage and acquisition: Timer (Java Platform SE 8 )
  2. Kotlin extension over Timer, for schedule method: java.util.Timer - Kotlin Programming Language
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