Created
June 11, 2018 19:57
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Apply money mask with TextWatcher
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| public static class MoneyTextWatcher implements TextWatcher { | |
| private final WeakReference<EditText> editTextWeakReference; | |
| private NumberFormat mNF = NumberFormat.getCurrencyInstance(new Locale("pt", "BR")); | |
| private boolean updating; | |
| private boolean deleting; | |
| public MoneyTextWatcher(EditText editText) { | |
| editTextWeakReference = new WeakReference<>(editText); | |
| //detect delete | |
| editTextWeakReference.get().setOnKeyListener((v, keyCode, event) -> { | |
| deleting = event.getAction() == KeyEvent.ACTION_DOWN && event.getKeyCode() == KeyEvent.KEYCODE_DEL; | |
| return false; | |
| }); | |
| } | |
| @Override | |
| public void beforeTextChanged(CharSequence cs, int start, int count, int after) { | |
| } | |
| @Override | |
| public void onTextChanged(CharSequence cs, int start, int before, int count) { | |
| } | |
| @Override | |
| public void afterTextChanged(Editable editable) { | |
| if (updating) { | |
| return; | |
| } | |
| updating = true; | |
| applyMask(editable, editTextWeakReference.get()); | |
| updating = false; | |
| } | |
| private void applyMask(Editable editable, EditText editText) { | |
| if (TextUtils.isEmpty(editable)) { | |
| return; | |
| } | |
| int cursorPosition = editText.getSelectionStart(); | |
| //remove input filters to ignore input type | |
| InputFilter[] filters = editable.getFilters(); | |
| editable.setFilters(new InputFilter[0]); | |
| String cleanString = editable.toString().replaceAll("[R$,. ]", ""); | |
| BigDecimal parsed = new BigDecimal(cleanString).setScale(2, BigDecimal.ROUND_FLOOR).divide(new BigDecimal(100), BigDecimal.ROUND_FLOOR); | |
| String formatted = mNF.format(parsed); | |
| editable.clear(); | |
| editable.append(formatted); | |
| //reset filters | |
| editable.setFilters(filters); | |
| int currentTextLen = editable.length(); | |
| //check if deleting | |
| if (deleting && cursorPosition < currentTextLen) { | |
| editText.setSelection(formatted.length()); | |
| deleting = false; | |
| } | |
| } | |
| } |
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