trying to format text in edittext using the Locale to add decimal places and comma seperators after user has typed

FormatRealTime.kt

val df = DecimalFormat("#,###", DecimalFormatSymbols(Locale.getDefault()))
        var textChanged = false

        df.minimumFractionDigits = 0
        df.maximumFractionDigits = asset.investmentDecimalPlaces

        layout.txt_amount.textChanges()
            .debounce(400, TimeUnit.MILLISECONDS)
            .map { layout.txt_amount.text.toString() }
            .subscribeOn(AndroidSchedulers.mainThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe {
                layout.txt_amount.setText(it)
                layout.txt_amount.setSelection(it.length)
                textChanged = true
            }
            .addTo(disposables)

        layout.txt_amount.afterTextChangeEvents()
            .debounce(2000, TimeUnit.MILLISECONDS)
            .map { layout.txt_amount.text.toString() }
            .subscribeOn(AndroidSchedulers.mainThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe({
                if (textChanged) {
                    val formatted = df.format(
                        it.replace(DecimalFormatSymbols(Locale.getDefault()).groupingSeparator.toString(), "")
                            .toDouble()
                    )
                    layout.txt_amount.setText(formatted)
                    layout.txt_amount.setSelection(formatted.length)
                    textChanged = false
                }
            }, {
                it.printStackTrace()
            })
            .addTo(disposables)