我不明白你真正想要的，请你解释一下你的需求是什么？

您想在用户输入后打印最后一个数字吗？

I Have A Edit Text Box and there are 4 digit number but u only want last digit of a number a print in text view by call a button

What I have tried:

i have no idea that how to do this

i am not understanding what you really want can you please explain whats your need ?
You want to print the last number after get input by the user ?