GitHub - hasancse91/android-time-down-counter: I wrote a simple tutorial about Android Count Down Timer on my Blog. You can see the tutorial from this web link:
How To Create CountDown Timer App In Android Studio: Step By Step Guide | Create Android App
GitHub - tsuryo/Android-Countdown-Timer: Android library provide a simple to use Countdown Timer View.
How to Create a Count Down Timer in Android – Learn to Droid