Two ways for handler to realize countdown in Android

Background:

In recent projects, the function block of login / registration is just achieved. It needs to send verification code to complete login / registration within the specified time. This function was also available in previous projects, but I felt it was too complex, so I had to re implement it myself. Using handler, I think the code introduction and logic are clear.

Code 1:

Code 2:

As can be seen from the above code, using handler. Post (runnable) is a convenient way to publish messgae.

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