【问题标题】:Android EditText AddTextChangeListener Currency FormatAndroid EditText AddTextChangeListener 货币格式
【发布时间】:2014-11-19 21:12:04
【问题描述】:

通过 SO,我将以下 EditText addTextChangedListener 事件处理程序放在一起,它工作正常,除了我需要一些改进。当我输入时,它会从右到左填充数字。我宁愿它从左到右填充。现在,如果我输入 50,它的格式为 $0.50,当我输入 50 时,我希望它的格式为 $50.00

以下是 xml 声明和 Java 代码,请有人指出我需要更改什么以获得所需的结果。

XML 声明

    <EditText
        android:id="@+id/valueEditText"
        android:layout_row="1"
        android:hint="@string/hint_value_to_add"
        android:imeOptions="actionNext"
        android:inputType="numberDecimal"
        style="@style/EnrollEditViewStyle" />
    <requestFocus />

Java 代码

      inputValue = (EditText) findViewById(R.id.valueEditText);
        inputValue.addTextChangedListener(new TextWatcher() {
            private String current = "";
            @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 (!s.toString().equals(current)) {
                    inputValue.removeTextChangedListener(this);

                    String replaceable = String.format("[%s,.\\s]", NumberFormat.getCurrencyInstance().getCurrency().getSymbol());
                    String cleanString = s.toString().replaceAll(replaceable, "");

                    double parsed;
                    try {
                        parsed = Double.parseDouble(cleanString);
                    } catch (NumberFormatException e) {
                        parsed = 0.00;
                    }
                    String formatted = NumberFormat.getCurrencyInstance().format((parsed/100));

                    current = formatted;
                    inputValue.setText(formatted);
                    inputValue.setSelection(formatted.length());
                    inputValue.addTextChangedListener(this);
                }
            }
        });

【问题讨论】:

  • 这是我从另一个 SO 问题中得到的结果
  • @skywall 这就是他们添加之前删除的小数的方式。由于并非所有货币都有 2 个小数位,因此无法在全球范围内使用的肮脏解决方案。

标签: android android-edittext


【解决方案1】:

根据这个 SO 问题 Format EditText to currency with whole numbers 我将 setMaximumFractionDigits 添加到 0 就像这样

@Override
    public void afterTextChanged(Editable s) {
        if (!s.toString().equals(current)) {
            inputValue.removeTextChangedListener(this);

        String replaceable = String.format("[%s,.\\s]",   NumberFormat.getCurrencyInstance().getCurrency().getSymbol());
        String cleanString = s.toString().replaceAll(replaceable, "");

        double parsed;
        try {
            parsed = Double.parseDouble(cleanString);
        } catch (NumberFormatException e) {
            parsed = 0.00;
        }
        NumberFormat formatter = NumberFormat.getCurrencyInstance();
        formatter.setMaximumFractionDigits(0);
        String formatted = formatter.format((parsed));

        current = formatted;
        inputValue.setText(formatted);
        inputValue.setSelection(formatted.length());
        inputValue.addTextChangedListener(this);
    }

【讨论】:

    【解决方案2】:

    Kotlin 版本

    var current = ""
    
    editText.addTextChangedListener(object: TextWatcher {
        override fun afterTextChanged(s: Editable?) {}
        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
    
        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
            val stringText = s.toString()
    
            if(stringText != current) {
                editText.removeTextChangedListener(this)
    
                val locale: Locale = Locale.UK
                val currency = Currency.getInstance(locale)
                val cleanString = stringText.replace("[${currency.symbol},.]".toRegex(), "")
                val parsed = cleanString.toDouble()
                val formatted = NumberFormat.getCurrencyInstance(locale).format(parsed / 100)
    
                current = formatted
                editText.setText(formatted)
                editText.setSelection(formatted.length)
                editText.addTextChangedListener(this)
            }
        }
    })
    

    【讨论】:

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