How to realize countdown without threads in Android

Requirements:

Several components can enable the countdown. Under normal circumstances, the UI is updated after the end of the default countdown time. In addition, the user can cancel the specified countdown.

Here, countdowntimer is used for countdown. The callback function onfinish is the callback at the end of the countdown, and ontick is the callback at the beginning of the countdown. You can cancel the countdown using the cancel method of the countdowntimer object.

The benefits of this: you don't need to use cumbersome threads to control the countdown, and it's more convenient to update the UI.

Upper Code:

MainActivity

activity_ main.xml

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