CurrencyEditText.kt

@SuppressLint("Recycle")
class CurrencyEditText @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = com.google.android.material.R.attr.editTextStyle
): TextInputEditText(context, attrs, defStyleAttr) {

    private var current = ""
    private val editText = this@CurrencyEditText
    private var currency = ""
    private var decimals = true

    init {
        addTextChangedListener(object : TextWatcher {
            override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {}
            override fun onTextChanged(s: CharSequence, i: Int, i1: Int, i2: Int) {
                val temp = s.toString().replace(",", "").replace(".", "")
                if (temp != current) {
                    editText.removeTextChangedListener(this)
                    if (temp.isEmpty()) {
                        currency = "0,00"
                        editText.setText(currency)
                        editText.setSelection(editText.text.toString().length)
                    } else {
                        if (temp.length < 3) {
                            if (temp.length == 1) {
                                currency = "0,0$temp"
                                editText.setText(currency)
                                editText.setSelection(editText.text.toString().length)
                            } else if (temp.length == 2) {
                                currency = "0,$temp"
                                editText.setText(currency)
                                editText.setSelection(editText.text.toString().length)
                            }
                        } else {
                            var tempAmount = temp
                            while (tempAmount.isNotEmpty() && tempAmount.substring(0, 1) == "0") {
                                tempAmount = tempAmount.substring(1, tempAmount.length)
                            }

                            if (tempAmount.isEmpty()) {
                                currency = "0,00"
                                editText.setText(currency)
                                editText.setSelection(editText.text.toString().length)
                            } else {
                                tempAmount = tempAmount.replace(".", "").replace(",","")

                                if (tempAmount.length < 3) {
                                    if (tempAmount.length == 1) {
                                        currency = "0,0$tempAmount"
                                        editText.setText(currency)
                                        editText.setSelection(editText.text.toString().length)
                                    } else if (tempAmount.length == 2) {
                                        currency = "0,$tempAmount"
                                        editText.setText(currency)
                                        editText.setSelection(editText.text.toString().length)
                                    }
                                } else {
                                    val digitsCount = 2


                                    val digitsAmount = tempAmount.takeLast(digitsCount)
                                    val netAmount = tempAmount.substring(0, tempAmount.length - digitsCount)

                                    currency = AmountConverter.convertAmount("$netAmount.$digitsAmount")
                                    editText.setText(currency)
                                    editText.setSelection(editText.text.toString().length)
                                }
                            }
                        }
                    }
                    editText.addTextChangedListener(this)
                }
            }

            override fun afterTextChanged(editable: Editable) {}
        })
    }

    val cleanDoubleValue: Double
        get() {
            if ((editText.text ?: "").isEmpty()) {
                return 0.00
            }
            var value = 0.0
            if (decimals) {
                try {
                    val valueAsText = editText.text.toString().replace("[$,.]".toRegex(), "")
                        .replace(currency.toRegex(), "")
                    value = if (valueAsText.length < 3) {
                        "00.$valueAsText".toDouble()
                    } else {
                        val currencyAsText = valueAsText.substring(0, valueAsText.length - 2)
                        val currencyDigitsAsText = valueAsText.substring(valueAsText.length - 2)
                        "$currencyAsText.$currencyDigitsAsText".toDouble()
                    }
                } catch (e: NumberFormatException) {
                }
            } else {
                val cleanString = editText.text.toString().replace("[$,.]".toRegex(), "")
                    .replace(currency.toRegex(), "").replace("\\s+".toRegex(), "")
                try {
                    value = cleanString.toDouble()
                } catch (e: NumberFormatException) {
                }
            }
            return value
        }
}