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how to set limit to edit text limit in kotlinlang

hi i want set limit for my text edit in kotlin
please help...!

i want set 3 digit number for each of this inputs

        var num1=edt_no.text
        var num2=edt_ntw.text
        var num3=edt_nth.text
        var num4=edt_f.text
        when{
            edt_no.text.isEmpty() -> txt_res.text="First is empty"
            edt_ntw.text.isEmpty() -> txt_res.text="second is empty"
            edt_nth.text.isEmpty() -> txt_res.text="third is empty"
            edt_f.text.isEmpty() -> txt_res.text="Fourth is empty"
            else -> calc(num1,num2,num3,num4)
        }

You need 2 attributes for each EditText :

android:maxLength="3"
android:inputType="number"

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