更改倒数计时器的长度

Question

I want to change the length of my Countdowntimer when it finishs. So I got a Random Number which changes everytime.

standby_time    = 15000
standby_counter = new CountDownTimer(standby_time,1000) {

            @Override
            public void onTick(long millisUntilFinished) {

                ++standby_zaehler;

            }

            @Override
            public void onFinish() {

                ...
                standby_zaehler = 0;

                rndm_groesse = 60000;
                random_zahl = r.nextInt(rndm_groesse);              
                standby_time = random_zahl;

                standby_counter.start();
            }
        };

Where is my fault ? The time is not changing and takes the first value (15sec)

Answer 1

The countdown timers time isnt ment to be changed. You can recreate the timer to alter the time but because you are looking to start it again inside the onFinish() method it would be wise to use a different implementation better suited for this task. The java.util.Timer class does this well.

private Timer timer = new Timer();
private int standby_zaehler = 0;
private Random r = new Random();

public void scheduleNextTimer() {
    // reset our countdown
    standby_zaehler = 0;
    timer.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            // 1 second passed, remove it to the countdown
            --standby_zaehler;
            // we are finished counting down. get a new max seconds
            if(standby_zaehler < 0) {
                standby_zaehler = r.nextInt(60);
            }
        }
    }, 1000, 1000);
}

As you can see we dont even need to create a new timer, just reset the number and begin again.