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el.trasgu
Asked: 2022-07-27 07:25:01 +0800 CST 2022-07-27 07:25:01 +0800 CST

Doubts with Timer android studio Java

  • 772

I have the following code for a Timer that counts down from 3 seconds

The problem is that it feeds back over and over again and I don't see a way to stop it.

Can someone explain to me how it works and why the "timer3.cancel()" statement doesn't work?

//método de cuenta atrás
private void time3() {
    //instancio el Timer
    timer3 = new Timer();
    
    timer3.schedule(new TimerTask() {
        //inicia el timer
        public void run() {

            //al valor inicial de la variable, que he puesto en 4, le descuento 1
            midTime3--;
            //calculo la operación para trabajar en segundos
            long ss3 = midTime3 % 60;

            //si el segundo es cero
            if (ss3 == 0) {
                //borro el texto del textView
                txtRelojEjercicio2.setText("");
                //Vuelvo a darle el valor de 4 a la variable, pues se volverá a llamar al método en breve
                midTime3 = 4;
                //cancelo en Timer3 en marcha
                //lo que deseo es detener el Timer hasta que que vuelva a ser llamado el método
                timer3.cancel();
            }
            //si el segundo está entre 4 y 1
            else if ((ss3 < 5) && (ss3 > 0)) {
                //escribo la cuenta atrás en el TextView
                txtRelojEjercicio2.setText("00:0" + ss3 + "");
            }
        }
    //argumentos del timer para que se ejecute cada segundo
    }, 0, 1000);
}

I want to stop the timer, but it restarts over and over again

Can someone shed some light on this for me?

Thank you

java

1 Answers

  1. Best Answer

    To create a Timer that is executed only once, it is done in this way, if you notice, there is only one parameter that indicates the time that will elapse for the task to be executed:

    timer.schedule(new TimerTask() {
    @Override
    public void run() {
        //Realiza proceso.
    }
}, 1000); // 1 segundo

    In order for your timer to run only once you should use this constructor:

    schedule(TimerTask task, long delay) Schedules the specified task to run after the specified delay.

    In your case you are using a different constructor which would be executed repeatedly every second.

    schedule(TimerTask task, long delay, long period) Schedules the specified task for repeated execution with a fixed delay, starting after the specified delay.

    So for it to run only once after 1 second, it should be defined like this:

    timer3.schedule(new TimerTask() {
    //inicia el timer
    public void run() {
      ...
       //Realiza proceso.
      ...    
    }
//Se ejecuta solo una vez después de cada segundo.
}, 1000);
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