ValidationUtil.kt

gistfile1.txt

package `in`.gsrathoreniks.validationdemo

import androidx.appcompat.widget.AppCompatEditText
import java.util.regex.Pattern

object ValidationUtil {

    fun isValidUsername(view: AppCompatEditText, username: String?, regex: String = "^[a-zA-Z0-9._-]{3,20}$"): Boolean {
        view.requestFocus()
        when {
            isNullOrEmpty(username) -> view.error = "Enter Username"
            !Pattern.matches(regex, username) -> view.error = "Please enter a valid Username"
            else -> return false
        }
        return true
    }

    fun isNullOrEmpty(input: String?): Boolean = input == null || input.isEmpty()



}