Countdowntimer in Android implements the countdown function

CountDownTimer

Countdowntimer is an Android built-in countdown class. Using this class, you can easily implement the countdown function

Implementation of countdowntimer

Realization effect

Cancel timer

Calling the cancel () method of countdowntimer can cancel the timer for us: however, this method has effect only when it is above Android 5.0, but it has no effect below Android 5.0. If we need to use cancel in systems below Android 5.0, we need to re implement it according to the implementation method in the countdowntimer source code.

Due to the addition of one above Android 5.0

So we only need to remove it in systems below 5.0

Just remove this judgment.

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