InputFilter min, max for EditText

InputFilterMinMax.kt

import android.text.InputFilter
import android.text.Spanned

class InputFilterMinMax : InputFilter {

    private var min: Int = 0
    private var max: Int = 0

    constructor(min: Int, max: Int) {
        this.min = min
        this.max = max
    }

    constructor(min: String, max: String) {
        this.min = Integer.parseInt(min)
        this.max = Integer.parseInt(max)
    }

    override fun filter(
        source: CharSequence,
        start: Int,
        end: Int,
        dest: Spanned,
        dstart: Int,
        dend: Int
    ): CharSequence? {
        try {
            val input = Integer.parseInt(dest.toString() + source.toString())
            if (isInRange(min, max, input))
                return null
        } catch (nfe: NumberFormatException) {
        }

        return ""
    }

    private fun isInRange(a: Int, b: Int, c: Int): Boolean {
        return if (b > a) c in a..b else c in b..a
    }
}


//Usages 
editText.filters = arrayOf<InputFilter>(InputFilterMinMax("1", "300"))