Coin mask on the field

Question

I would like to create masks in my android number field.
I’ve already managed to add the mask ###,##.
But this is not a good practice, because if I want to add a value of R $ 1,000,00 the field does not accept.
Has anyone there ever been there ?

Answer 1

Arthur, I have a class TextWatcherthat I use in my project, see if it suits you:

public class MoneyTextWatcher implements TextWatcher {
    private final WeakReference<EditText> editTextWeakReference;
    private final Locale locale;

    public MoneyTextWatcher(EditText editText, Locale locale) {
        this.editTextWeakReference = new WeakReference<EditText>(editText);
        this.locale = locale != null ? locale : Locale.getDefault();
    }

    public MoneyTextWatcher(EditText editText) {
        this.editTextWeakReference = new WeakReference<EditText>(editText);
        this.locale = Locale.getDefault();
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override
    public void afterTextChanged(Editable editable) {
        EditText editText = editTextWeakReference.get();
        if (editText == null) return;
        editText.removeTextChangedListener(this);

        BigDecimal parsed = parseToBigDecimal(editable.toString(), locale);
        String formatted = NumberFormat.getCurrencyInstance(locale).format(parsed);

        editText.setText(formatted);
        editText.setSelection(formatted.length());
        editText.addTextChangedListener(this);
    }

    private BigDecimal parseToBigDecimal(String value, Locale locale) {
        String replaceable = String.format("[%s,.\\s]", NumberFormat.getCurrencyInstance(locale).getCurrency().getSymbol());

        String cleanString = value.replaceAll(replaceable, "");

        return new BigDecimal(cleanString).setScale(
            2, BigDecimal.ROUND_FLOOR).divide(new BigDecimal(100), BigDecimal.ROUND_FLOOR
        );
    }
}

In his EditText add the TextWatcher:

Locale mLocale = new Locale("pt", "BR");
mEditTextValorParc.addTextChangedListener(new MoneyTextWatcher(mEditTextValorParc, mLocale));

In this case, it will format the EditText as the user enters the numbers, as happens in a credit card machine. If he type for example the number 2, would be 0,02, if right after he typed the 1, it would 0,21, and so on.