Why does my Timer crashes my android activity when I stop it?

I’m trying to make a toggle button that can stop and replay a Timer, it worked just fine until I added a new method called “Set_BPM”. It starts and it stops correctly, it crashes when I try …

CountDownTimer in Android using Java

I am trying to implement a timer in android. I am using the countdowntimer. Here, is the timer code: new CountDownTimer(totalTime * 1000, 1000) { @Override public void onTick(long l) {…

TimerTask class has to run only once in java

I have a class that runs for every 10 secs, but when I execute it more than once, multiple timers are started. If one timer is already running, I want the other timer calls to be ignored. I want only …