How to make a Countdown Timer in Android using Kotlin
- January 23, 2020
- John Codeos
Today, I will show you how to build a timer that countdowns until an event (e.g. new year’s day or release date of a video game) using the Handler to update the TextView every second.
First, add a TextView in your layout, like that:
Then go to your Activity and create a function with a name updateTime() and set the current date:
Set the event date
Find how many milliseconds left until the event
Convert the milliseconds to days, hours, minutes, and seconds
Show the countdown timer in your TextView
Now, to call the updateTime() function every second, we’re going to use the Handler() class and repeat the handler every second (1000 milliseconds)
If you want to show different text after the event has passed, create a function with a name endEvent and pass the currentdate and eventdate.
After you have shown your text, stop the handler from repeating.
You can find the final project here
If you have any questions feel free to DM me on Twitter @johncodeos or leave a comment below!