formvalidation example

FormValidation.kt

private var email = MutableLiveData<String>().apply { value = "" }
private var password = MutableLiveData<String>()

var emailErrorMsg = MutableLiveData<String>()
var passwordErrorMsg = MutableLiveData<String>()
var isEmailErrorMsgEnabled = MutableLiveData<Boolean>()
var isPasswordErrorMsgEnabled = MutableLiveData<Boolean>()


fun  performValidation(){

    var emailError = ""
    var passwordError = ""

    when {
        email.value.isNullOrEmpty() -> {
            emailErrorMsg.value = "Field can't be empty"
        }
        EMAIL_ADDRESS.matcher(email.value).matches().not() -> {
            emailErrorMsg.value  ="Invalid Email Address"
        }
    }

    when {
        password.value.isNullOrEmpty() -> {
            passwordErrorMsg.value = "Field can't be empty"
        }
        password.value!!.length in 6..20 -> {
            passwordErrorMsg.value = "The password length should be more than 4 letters"
        }
    }

    isEmailErrorMsgEnabled.value = emailError.isEmpty().not()
    isPasswordErrorMsgEnabled.value = passwordError.isEmpty().not()

    if (emailError.isEmpty() && passwordError.isEmpty()){
        // perform login action
    }
}