Android countdown button example code

Recently, someone asked me how to realize the countdown button function, such as sending verification code. I remember a countdowntimer. Because I haven't used it for a long time, I wrote one myself. The code is as follows

Click the button to start the countdown. It seems very simple, but some problems are found when running. Let's see the effect picture first

Let's print the time

Here we can see that the number of 8 seconds does not appear, and the last 1 second is a little long. Every time you click to start the countdown, there will be an occasional problem of one less number. Therefore, this thing is inaccurate. Many people say it on the Internet. Is there any other implementation idea? Here we define a countdown button

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