无符号 Android 的 EditText CurrencyFormat

Question

下面的代码会产生 stackoverflow 错误。这个想法是在用户输入金额时或之后格式化金额。

500 -> 500.00

1000 -> 1 000.00

29999.55-> 29 999.55

.. .. ..

   edit_amount.addTextChangedListener(new TextWatcher() {

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

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                                      int after) {
            // TODO Auto-generated method stub
        }

        @Override
        public void afterTextChanged(Editable s) {


            if (edit_amount.getText().toString().length()>0){



                edit_amount.setText(
                        currencyFormat(edit_amount.getText().toString()));

            }else {}


        }
    });



  public String currencyFormat(String number){

        String credits="";

        try {
            //en, us

            if (TextUtils.isEmpty(MyApplication.pref.GetPreferences("AppCurrency"))){

                credits = NumberFormat.getCurrencyInstance(new Locale("fr", "FR")).format(Double.valueOf(number));

            }else {

                if (MyApplication.pref.GetPreferences("AppCurrency").equals("Euro")) {

                    credits = NumberFormat.getCurrencyInstance(new Locale("fr", "FR")).format(Double.valueOf(number));

                } else {

                    credits = NumberFormat.getCurrencyInstance(new Locale("en", "US")).format(Double.valueOf(number));

                }
            }

        }catch(Exception ex){

            credits = "mCredits";

        }



        return credits;
    }

Answer 1

您的代码不起作用，因为当您调用 edit_amount.setText(...) 时，会触发 afterTextChanged(Editable s)，然后触发 edit_amount.setText(...)，依此类推。你需要改变你的逻辑来做你想做的事情并避免堆栈溢出。

例如，您可以取消注册TextWatcher、setText，然后重新注册。

或者，您可以设置一个标志，以便您的 TextWatcher 知道您何时自己更改了文本，然后指示 TextWatcher 忽略它。

Answer 2

为了避免 afterTextChanged 回调的递归调用，您可以设置额外的检查。像这样的东西

@Override
public void afterTextChanged(Editable s) {
    if (et.getText().toString().length() > 0) {
        String src = et.getText().toString();
        String origin = currencyFormat(src);
        if(!src.equals(origin)) {
            et.setText(currencyFormat(et.getText().toString()));
        }
    }
}

Answer 3

试试下面的代码：

private String current = "";
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
    if(!s.toString().equals(current)){
       [your_edittext].removeTextChangedListener(this);

       String cleanString = s.toString().replaceAll("[$,.]", "");

       double parsed = Double.parseDouble(cleanString);
       String formatted = NumberFormat.getCurrencyInstance().format((parsed/100));

       current = formatted;
       [your_edittext].setText(formatted);
       [your_edittext].setSelection(formatted.length());

       [your_edittext].addTextChangedListener(this);
    }
}