Android EditText資金輸入正則表達式，不帶“ $”符號

Question

我想輸入十進制數字，例如“ 23.50”，“ 250.75”。 下面的代碼提供了這一點，但是它在數字的前面放置了一個“ $”符號，例如“ $ 23.50”，“ $ 250.75” ..我想刪除美元符號並嘗試了幾種方法，但是我做不到。 如何更改正則表達式和顯示？

以下代碼：

    inputAmount.setRawInputType(Configuration.KEYBOARD_12KEY);


    inputAmount.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {}
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if(!s.toString().matches("^\\$(\\d{1,3}(\\,\\d{3})*|(\\d+))(\\.\\d{2})?"))
            {
                String userInput= ""+s.toString().replaceAll("[^\\d]", "");
                StringBuilder cashAmountBuilder = new StringBuilder(userInput);

                while (cashAmountBuilder.length() > 3 && cashAmountBuilder.charAt(0) == '0') {
                    cashAmountBuilder.deleteCharAt(0);
                }
                while (cashAmountBuilder.length() < 3) {
                    cashAmountBuilder.insert(0, '0');
                }
                cashAmountBuilder.insert(cashAmountBuilder.length()-2, '.');
                cashAmountBuilder.insert(0,'$');

                inputAmount.setText(cashAmountBuilder.toString());
                // keeps the cursor always to the right
                Selection.setSelection(inputAmount.getText(), cashAmountBuilder.toString().length());

            }

        }
    });

Answer 1

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

            if(!s.toString().matches("^\\ (\\d{1,3}(\\,\\d{3})*|(\\d+))(\\.\\d{2})?$"))
            {
                String userInput= ""+s.toString().replaceAll("[^\\d]", "");
                StringBuilder cashAmountBuilder = new StringBuilder(userInput);

                while (cashAmountBuilder.length() > 3 && cashAmountBuilder.charAt(0) == '0') {
                    cashAmountBuilder.deleteCharAt(0);
                }
                while (cashAmountBuilder.length() < 3) {
                    cashAmountBuilder.insert(0, '0');
                }
                cashAmountBuilder.insert(cashAmountBuilder.length()-2, '.');
                cashAmountBuilder.insert(0, ' ');

                edAmountAddMoney.setText(cashAmountBuilder.toString());
                // keeps the cursor always to the right
                Selection.setSelection(edAmountAddMoney.getText(), cashAmountBuilder.toString().length());

            }
        }

我用空格代替$，它對我有用

Answer 2

刪除行：

cashAmountBuilder.insert(0,'$');

並從正則表達式中刪除\\\\$ 。