We will be making a simple count down timer Android app written in Java in this tutorial. Overriding the onFinish() method will allow you to trigger specific functionality once the count down has completed, for example, showing a count down completion message.Overriding the onTick(long) method will allow you to trigger specific functionality, such as updating the remaining time left in the count down, every time the interval elapses.When creating a CountDownTimer to use, the onTick(long) and onFinish() methods will be overriden.The CountDownTimer has a start() method to begin the timer and a cancel() method to end the timer.The second argument in the constructor, long countDownInternal, is the interval (in milliseconds) when the onTick(long) callback will be triggered.The first argument in the constructor, long millisInFuture, is the number of milliseconds in the future after the count down timer is started (using the start() method) that the timer will expire and trigger the onFinish() callback.The constructor for CountDownTimer takes two arguments.It is available in the android.os package and can be imported using “import android.os.CountDownTimer ”.The CountDownTimer was added in Android API level.What functionality does the CountDownTimer offer?
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