Question

我有一个editText，起始值是$ 0.00。按1时，它变为$ 0.01。按4，它达到$ 0.14。按8，$ 1.48。按退格键，0.14美元等等。

这样可行，问题是，如果有人手动定位光标，格式化中会出现问题。如果他们要删除小数，它就不会回来。如果他们将光标放在小数前面并输入2，它将显示$ 02.00而不是$ 2.00。如果他们试图删除$，它将删除一个数字，例如。

以下是我正在使用的代码，我很感激任何建议。

mEditPrice.setRawInputType(Configuration.KEYBOARD_12KEY);
    public void priceClick(View view) {
    mEditPrice.addTextChangedListener(new TextWatcher(){
        DecimalFormat dec = new DecimalFormat("0.00");
        @Override
        public void afterTextChanged(Editable arg0) {
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start,
                int count, int after) {
        }
        @Override
        public void onTextChanged(CharSequence s, int start,
                int before, int count) {
            if(!s.toString().matches("^\\$(\\d{1,3}(\\,\\d{3})*|(\\d+))(\\.\\d{2})?$"))
            {
                String userInput= ""+s.toString().replaceAll("[^\\d]", "");
                if (userInput.length() > 0) {
                    Float in=Float.parseFloat(userInput);
                    float percen = in/100;
                    mEditPrice.setText("$"+dec.format(percen));
                    mEditPrice.setSelection(mEditPrice.getText().length());
                }
            }
        }
    });

Answer 1

我测试了你的方法，但是当我使用大数字时它失败了......我创建了这个：

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);
    }
}

Answer 2

基于上述一些答案，我创建了一个MoneyTextWatcher，您可以按如下方式使用：

priceEditText.addTextChangedListener(new MoneyTextWatcher(priceEditText));

并且在这里上课：

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

    public MoneyTextWatcher(EditText editText) {
        editTextWeakReference = new WeakReference<EditText>(editText);
    }

    @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;
        String s = editable.toString();
        if (s.isEmpty()) return;
        editText.removeTextChangedListener(this);
        String cleanString = s.replaceAll("[$,.]", "");
        BigDecimal parsed = new BigDecimal(cleanString).setScale(2, BigDecimal.ROUND_FLOOR).divide(new BigDecimal(100), BigDecimal.ROUND_FLOOR);
        String formatted = NumberFormat.getCurrencyInstance().format(parsed);
        editText.setText(formatted);
        editText.setSelection(formatted.length());
        editText.addTextChangedListener(this);
    }
}

Answer 3

实际上，之前提供的解决方案不起作用。如果要输入100.00，则不起作用。

替换：

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

使用：

BigDecimal parsed = new BigDecimal(cleanString).setScale(2,BigDecimal.ROUND_FLOOR).divide(new BigDecimal(100),BigDecimal.ROUND_FLOOR);                
String formato = NumberFormat.getCurrencyInstance().format(parsed);

我必须说我对我的代码进行了一些修改。问题是你应该使用BigDecimal的

Answer 4

这是我的自定义CurrencyEditText

import android.content.Context;import android.graphics.Rect;import android.text.Editable;import android.text.InputFilter;import android.text.InputType;import android.text.TextWatcher;
import android.util.AttributeSet;import android.widget.EditText;import java.math.BigDecimal;import java.math.RoundingMode;
import java.text.DecimalFormat;import java.text.DecimalFormatSymbols;
import java.util.Locale;

/**
 * Some note <br/>
 * <li>Always use locale US instead of default to make DecimalFormat work well in all language</li>
 */
public class CurrencyEditText extends android.support.v7.widget.AppCompatEditText {
    private static String prefix = "VND ";
    private static final int MAX_LENGTH = 20;
    private static final int MAX_DECIMAL = 3;
    private CurrencyTextWatcher currencyTextWatcher = new CurrencyTextWatcher(this, prefix);

    public CurrencyEditText(Context context) {
        this(context, null);
    }

    public CurrencyEditText(Context context, AttributeSet attrs) {
        this(context, attrs, android.support.v7.appcompat.R.attr.editTextStyle);
    }

    public CurrencyEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);
        this.setHint(prefix);
        this.setFilters(new InputFilter[] { new InputFilter.LengthFilter(MAX_LENGTH) });
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
        if (focused) {
            this.addTextChangedListener(currencyTextWatcher);
        } else {
            this.removeTextChangedListener(currencyTextWatcher);
        }
        handleCaseCurrencyEmpty(focused);
    }

    /**
     * When currency empty <br/>
     * + When focus EditText, set the default text = prefix (ex: VND) <br/>
     * + When EditText lose focus, set the default text = "", EditText will display hint (ex:VND)
     */
    private void handleCaseCurrencyEmpty(boolean focused) {
        if (focused) {
            if (getText().toString().isEmpty()) {
                setText(prefix);
            }
        } else {
            if (getText().toString().equals(prefix)) {
                setText("");
            }
        }
    }

    private static class CurrencyTextWatcher implements TextWatcher {
        private final EditText editText;
        private String previousCleanString;
        private String prefix;

        CurrencyTextWatcher(EditText editText, String prefix) {
            this.editText = editText;
            this.prefix = prefix;
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            // do nothing
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // do nothing
        }

        @Override
        public void afterTextChanged(Editable editable) {
            String str = editable.toString();
            if (str.length() < prefix.length()) {
                editText.setText(prefix);
                editText.setSelection(prefix.length());
                return;
            }
            if (str.equals(prefix)) {
                return;
            }
            // cleanString this the string which not contain prefix and ,
            String cleanString = str.replace(prefix, "").replaceAll("[,]", "");
            // for prevent afterTextChanged recursive call
            if (cleanString.equals(previousCleanString) || cleanString.isEmpty()) {
                return;
            }
            previousCleanString = cleanString;

            String formattedString;
            if (cleanString.contains(".")) {
                formattedString = formatDecimal(cleanString);
            } else {
                formattedString = formatInteger(cleanString);
            }
            editText.removeTextChangedListener(this); // Remove listener
            editText.setText(formattedString);
            handleSelection();
            editText.addTextChangedListener(this); // Add back the listener
        }

        private String formatInteger(String str) {
            BigDecimal parsed = new BigDecimal(str);
            DecimalFormat formatter =
                    new DecimalFormat(prefix + "#,###", new DecimalFormatSymbols(Locale.US));
            return formatter.format(parsed);
        }

        private String formatDecimal(String str) {
            if (str.equals(".")) {
                return prefix + ".";
            }
            BigDecimal parsed = new BigDecimal(str);
            // example pattern VND #,###.00
            DecimalFormat formatter = new DecimalFormat(prefix + "#,###." + getDecimalPattern(str),
                    new DecimalFormatSymbols(Locale.US));
            formatter.setRoundingMode(RoundingMode.DOWN);
            return formatter.format(parsed);
        }

        /**
         * It will return suitable pattern for format decimal
         * For example: 10.2 -> return 0 | 10.23 -> return 00, | 10.235 -> return 000
         */
        private String getDecimalPattern(String str) {
            int decimalCount = str.length() - str.indexOf(".") - 1;
            StringBuilder decimalPattern = new StringBuilder();
            for (int i = 0; i < decimalCount && i < MAX_DECIMAL; i++) {
                decimalPattern.append("0");
            }
            return decimalPattern.toString();
        }

        private void handleSelection() {
            if (editText.getText().length() <= MAX_LENGTH) {
                editText.setSelection(editText.getText().length());
            } else {
                editText.setSelection(MAX_LENGTH);
            }
        }
    }
}

在XML中使用它

 <...CurrencyEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />

您应该在下面编辑2常量以适合您的项目

private static String prefix = "VND ";
private static final int MAX_DECIMAL = 3;

Demo on github

Answer 5

我使用实现TextWatcher更改类以使用Brasil货币格式并在编辑值时调整光标位置。

public class MoneyTextWatcher implements TextWatcher {

    private EditText editText;

    private String lastAmount = "";

    private int lastCursorPosition = -1;

    public MoneyTextWatcher(EditText editText) {
        super();
        this.editText = editText;
    }

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

        if (!amount.toString().equals(lastAmount)) {

            String cleanString = clearCurrencyToNumber(amount.toString());

            try {

                String formattedAmount = transformToCurrency(cleanString);
                editText.removeTextChangedListener(this);
                editText.setText(formattedAmount);
                editText.setSelection(formattedAmount.length());
                editText.addTextChangedListener(this);

                if (lastCursorPosition != lastAmount.length() && lastCursorPosition != -1) {
                    int lengthDelta = formattedAmount.length() - lastAmount.length();
                    int newCursorOffset = max(0, min(formattedAmount.length(), lastCursorPosition + lengthDelta));
                    editText.setSelection(newCursorOffset);
                }
            } catch (Exception e) {
               //log something
            }
        }
    }

    @Override
    public void afterTextChanged(Editable s) {
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        String value = s.toString();
        if(!value.equals("")){
            String cleanString = clearCurrencyToNumber(value);
            String formattedAmount = transformToCurrency(cleanString);
            lastAmount = formattedAmount;
            lastCursorPosition = editText.getSelectionStart();
        }
    }

    public static String clearCurrencyToNumber(String currencyValue) {
        String result = null;

        if (currencyValue == null) {
            result = "";
        } else {
            result = currencyValue.replaceAll("[(a-z)|(A-Z)|($,. )]", "");
        }
        return result;
    }

    public static boolean isCurrencyValue(String currencyValue, boolean podeSerZero) {
        boolean result;

        if (currencyValue == null || currencyValue.length() == 0) {
            result = false;
        } else {
            if (!podeSerZero && currencyValue.equals("0,00")) {
                result = false;
            } else {
                result = true;
            }
        }
        return result;
    }

    public static String transformToCurrency(String value) {
        double parsed = Double.parseDouble(value);
        String formatted = NumberFormat.getCurrencyInstance(new Locale("pt", "BR")).format((parsed / 100));
        formatted = formatted.replaceAll("[^(0-9)(.,)]", "");
        return formatted;
    }
}

Answer 6

好的，这是处理货币格式，删除后退键击的更好方法。代码基于上面的@androidcurious代码...... 但是，处理与向后删除和一些解析异常相关的一些问题： http://miguelt.blogspot.ca/2013/01/textwatcher-for-currency-masksformatting.html [更新]以前的解决方案存在一些问题...... 这是一个更好的solutoin：http://miguelt.blogspot.ca/2013/02/update-textwatcher-for-currency.html 而且......这里有详细信息：

这种方法更好，因为它使用传统的Android机制。我们的想法是在用户存在View之后格式化值。

定义一个InputFilter来限制数值 - 在大多数情况下这是必需的，因为屏幕不够大，无法容纳长的EditText视图。这可以是静态内部类，也可以只是另一个普通类：

/** Numeric range Filter. */
class NumericRangeFilter implements InputFilter {
    /** Maximum value. */
    private final double maximum;
    /** Minimum value. */
    private final double minimum;
    /** Creates a new filter between 0.00 and 999,999.99. */
    NumericRangeFilter() {
        this(0.00, 999999.99);
    }
    /** Creates a new filter.
     * @param p_min Minimum value.
     * @param p_max Maximum value. 
     */
    NumericRangeFilter(double p_min, double p_max) {
        maximum = p_max;
        minimum = p_min;
    }
    @Override
    public CharSequence filter(
            CharSequence p_source, int p_start,
            int p_end, Spanned p_dest, int p_dstart, int p_dend
    ) {
        try {
            String v_valueStr = p_dest.toString().concat(p_source.toString());
            double v_value = Double.parseDouble(v_valueStr);
            if (v_value<=maximum && v_value>=minimum) {
                // Returning null will make the EditText to accept more values.
                return null;
            }
        } catch (NumberFormatException p_ex) {
            // do nothing
        }
        // Value is out of range - return empty string.
        return "";
    }
}

定义一个实现View.OnFocusChangeListener的类（内部静态或只是一个类）。请注意，我正在使用Utils类 - 可以在“Amounts，Taxes”中找到实现。

/** Used to format the amount views. */
class AmountOnFocusChangeListener implements View.OnFocusChangeListener {
    @Override
    public void onFocusChange(View p_view, boolean p_hasFocus) {
        // This listener will be attached to any view containing amounts.
        EditText v_amountView = (EditText)p_view;
        if (p_hasFocus) {
            // v_value is using a currency mask - transfor over to cents.
            String v_value = v_amountView.getText().toString();
            int v_cents = Utils.parseAmountToCents(v_value);
            // Now, format cents to an amount (without currency mask)
            v_value = Utils.formatCentsToAmount(v_cents);
            v_amountView.setText(v_value);
            // Select all so the user can overwrite the entire amount in one shot.
            v_amountView.selectAll();
        } else {
            // v_value is not using a currency mask - transfor over to cents.
            String v_value = v_amountView.getText().toString();
            int v_cents = Utils.parseAmountToCents(v_value);
            // Now, format cents to an amount (with currency mask)
            v_value = Utils.formatCentsToCurrency(v_cents);
            v_amountView.setText(v_value);
        }
    }
}

此类将在编辑时删除货币格式 - 依赖于标准机制。当用户退出时，将重新应用货币格式。

最好定义一些静态变量以最小化实例数：

   static final InputFilter[] FILTERS = new InputFilter[] {new NumericRangeFilter()};
   static final View.OnFocusChangeListener ON_FOCUS = new AmountOnFocusChangeListener();

最后，在onCreateView（...）中：

   EditText mAmountView = ....
   mAmountView.setFilters(FILTERS);
   mAmountView.setOnFocusChangeListener(ON_FOCUS);

您可以在任意数量的EditText视图上重复使用FILTERS和ON_FOCUS。

这是Utils类：

public class Utils {

   private static final NumberFormat FORMAT_CURRENCY = NumberFormat.getCurrencyInstance();
   /** Parses an amount into cents.
    * @param p_value Amount formatted using the default currency. 
    * @return Value as cents.
    */
   public static int parseAmountToCents(String p_value) {
       try {
           Number v_value = FORMAT_CURRENCY.parse(p_value);
           BigDecimal v_bigDec = new BigDecimal(v_value.doubleValue());
           v_bigDec = v_bigDec.setScale(2, BigDecimal.ROUND_HALF_UP);
           return v_bigDec.movePointRight(2).intValue();
       } catch (ParseException p_ex) {
           try {
               // p_value doesn't have a currency format.
               BigDecimal v_bigDec = new BigDecimal(p_value);
               v_bigDec = v_bigDec.setScale(2, BigDecimal.ROUND_HALF_UP);
               return v_bigDec.movePointRight(2).intValue();
           } catch (NumberFormatException p_ex1) {
               return -1;
           }
       }
   }
   /** Formats cents into a valid amount using the default currency.
    * @param p_value Value as cents 
    * @return Amount formatted using a currency.
    */
   public static String formatCentsToAmount(int p_value) {
       BigDecimal v_bigDec = new BigDecimal(p_value);
       v_bigDec = v_bigDec.setScale(2, BigDecimal.ROUND_HALF_UP);
       v_bigDec = v_bigDec.movePointLeft(2);
       String v_currency = FORMAT_CURRENCY.format(v_bigDec.doubleValue());
       return v_currency.replace(FORMAT_CURRENCY.getCurrency().getSymbol(), "").replace(",", "");
   }
   /** Formats cents into a valid amount using the default currency.
    * @param p_value Value as cents 
    * @return Amount formatted using a currency.
    */
   public static String formatCentsToCurrency(int p_value) {
       BigDecimal v_bigDec = new BigDecimal(p_value);
       v_bigDec = v_bigDec.setScale(2, BigDecimal.ROUND_HALF_UP);
       v_bigDec = v_bigDec.movePointLeft(2);
       return FORMAT_CURRENCY.format(v_bigDec.doubleValue());
   }

}

Answer 7

我建立在Guilhermes的答案上，但是我保留了光标的位置，并且还以不同的方式处理句点 - 这样如果用户在句点之后键入，这不会影响我发现这段时间之前的数字非常顺利的输入。

    [yourtextfield].addTextChangedListener(new TextWatcher()
    {
        NumberFormat currencyFormat = NumberFormat.getCurrencyInstance();
        private String current = "";

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

                   int selection = [yourtextfield].getSelectionStart();


                   // We strip off the currency symbol
                   String replaceable = String.format("[%s,\\s]", NumberFormat.getCurrencyInstance().getCurrency().getSymbol());
                   String cleanString = s.toString().replaceAll(replaceable, "");

                   double price;

                   // Parse the string                     
                   try
                   {
                       price = Double.parseDouble(cleanString);
                   }
                   catch(java.lang.NumberFormatException e)
                   {
                       price = 0;
                   }

                   // If we don't see a decimal, then the user must have deleted it.
                   // In that case, the number must be divided by 100, otherwise 1
                   int shrink = 1;
                   if(!(s.toString().contains(".")))
                   {
                       shrink = 100;
                   }

                   // Reformat the number
                   String formated = currencyFormat.format((price / shrink));

                   current = formated;
                   [yourtextfield].setText(formated);
                   [yourtextfield].setSelection(Math.min(selection, [yourtextfield].getText().length()));

                   [yourtextfield].addTextChangedListener(this);
                }
        }


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

        }


        @Override
        public void afterTextChanged(Editable s)
        {
        }
    });

Answer 8

我从here获得此信息并将其更改为符合葡萄牙货币格式。

import java.text.NumberFormat;
import java.util.Currency;
import java.util.Locale;

import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;

public class CurrencyTextWatcher implements TextWatcher {

    private String current = "";
    private int index;
    private boolean deletingDecimalPoint;
    private final EditText currency;

    public CurrencyTextWatcher(EditText p_currency) {
        currency = p_currency;
    }


    @Override
    public void beforeTextChanged(CharSequence p_s, int p_start, int p_count, int p_after) {

        if (p_after>0) {
                index = p_s.length() - p_start;
            } else {
                index = p_s.length() - p_start - 1;
            }
            if (p_count>0 && p_s.charAt(p_start)==',') {
                deletingDecimalPoint = true;
            } else {
                deletingDecimalPoint = false;
            }

    }

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

    }

    @Override
    public void afterTextChanged(Editable p_s) {


         if(!p_s.toString().equals(current)){
                currency.removeTextChangedListener(this);
                if (deletingDecimalPoint) {
                    p_s.delete(p_s.length()-index-1, p_s.length()-index);
                }
                // Currency char may be retrieved from  NumberFormat.getCurrencyInstance()
                String v_text = p_s.toString().replace("€","").replace(",", "");
                v_text = v_text.replaceAll("\\s", "");
                double v_value = 0;
                if (v_text!=null && v_text.length()>0) {
                    v_value = Double.parseDouble(v_text);
                }
                // Currency instance may be retrieved from a static member.
                NumberFormat numberFormat = NumberFormat.getCurrencyInstance(new Locale("pt", "PT"));
                String v_formattedValue = numberFormat.format((v_value/100));
                current = v_formattedValue;
                currency.setText(v_formattedValue);
                if (index>v_formattedValue.length()) {
                    currency.setSelection(v_formattedValue.length());
                } else {
                    currency.setSelection(v_formattedValue.length()-index);
                }
                // include here anything you may want to do after the formatting is completed.
                currency.addTextChangedListener(this);
             }
    }

}

layout.xml

<EditText
    android:id="@+id/edit_text_your_id"
    ...
    android:text="0,00 €"
    android:inputType="numberDecimal"
    android:digits="0123456789" />

让它开始工作

    yourEditText = (EditText) findViewById(R.id.edit_text_your_id);
    yourEditText.setRawInputType(Configuration.KEYBOARD_12KEY);
    yourEditText.addTextChangedListener(new CurrencyTextWatcher(yourEditText));

Answer 9

我使用Nathan Leigh引用的实现和Kayvan N和user2582318建议的正则表达式删除除数字之外的所有字符以创建以下版本：

fun EditText.addCurrencyFormatter() {

    // Reference: https://stackoverflow.com/questions/5107901/better-way-to-format-currency-input-edittext/29993290#29993290
    this.addTextChangedListener(object: TextWatcher {

        private var current = ""

        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) {

            if (s.toString() != current) {
                this@addCurrencyFormatter.removeTextChangedListener(this)
                // strip off the currency symbol

                // Reference for this replace regex: https://stackoverflow.com/questions/5107901/better-way-to-format-currency-input-edittext/28005836#28005836
                val cleanString = s.toString().replace("\\D".toRegex(), "")
                val parsed = if (cleanString.isBlank()) 0.0 else cleanString.toDouble()
                // format the double into a currency format
                val formated = NumberFormat.getCurrencyInstance()
                        .format(parsed / 100)

                current = formated
                this@addCurrencyFormatter.setText(formated)
                this@addCurrencyFormatter.setSelection(formated.length)

                this@addCurrencyFormatter.addTextChangedListener(this)
            }
        }
    })

}

这是Kotlin中的扩展函数，它将TextWatcher添加到EditText的TextChangedListener。

为了使用它，只需：

yourEditText = (EditText) findViewById(R.id.edit_text_your_id);
yourEditText.addCurrencyFormatter()

我希望它有所帮助。

Answer 10

虽然这里有很多答案，但我想分享一下我在here中找到的代码，因为我相信它是最强大和最干净的答案。

class CurrencyTextWatcher implements TextWatcher {

    boolean mEditing;

    public CurrencyTextWatcher() {
        mEditing = false;
    }

    public synchronized void afterTextChanged(Editable s) {
        if(!mEditing) {
            mEditing = true;

            String digits = s.toString().replaceAll("\\D", "");
            NumberFormat nf = NumberFormat.getCurrencyInstance();
            try{
                String formatted = nf.format(Double.parseDouble(digits)/100);
                s.replace(0, s.length(), formatted);
            } catch (NumberFormatException nfe) {
                s.clear();
            }

            mEditing = false;
        }
    }

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

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

}

希望它有所帮助。

Answer 11

最好使用InputFilter接口。使用正则表达式更容易处理任何类型的输入。我的货币输入格式解决方案：

public class CurrencyFormatInputFilter implements InputFilter {

Pattern mPattern = Pattern.compile("(0|[1-9]+[0-9]*)(\\.[0-9]{1,2})?");

@Override
public CharSequence filter(
        CharSequence source,
        int start,
        int end,
        Spanned dest,
        int dstart,
        int dend) {

String result = 
        dest.subSequence(0, dstart)
        + source.toString() 
        + dest.subSequence(dend, dest.length());

Matcher matcher = mPattern.matcher(result);

if (!matcher.matches()) return dest.subSequence(dstart, dend);

return null;
}
}

有效期：0.00,0.0,10.00,111.1
无效：0,0.000,111,10,010.00,01.0

使用方法：

editText.setFilters(new InputFilter[] {new CurrencyFormatInputFilter()});

Answer 12

对我而言，它就像这样工作

 public void onTextChanged(CharSequence s, int start,
                    int before, int count) {
                if(!s.toString().matches("^\\$(\\d{1,3}(\\,\\d{3})*|(\\d+))(\\.\\d{2})?$"))
                {
                    String userInput= ""+s.toString().replaceAll("[^\\d]", "");
                    if (userInput.length() > 2) {
                        Float in=Float.parseFloat(userInput);
                        price = Math.round(in); // just to get an Integer
                        //float percen = in/100;
                        String first, last;
                        first = userInput.substring(0, userInput.length()-2);
                        last = userInput.substring(userInput.length()-2);
                        edEx1.setText("$"+first+"."+last);
                        Log.e(MainActivity.class.toString(), "first: "+first + " last:"+last);
                        edEx1.setSelection(edEx1.getText().length());
                    }
                }
            }

Answer 13

我用它来允许用户输入货币并将其从字符串转换为int以存储在db中并再次从int更改为字符串

https://github.com/nleigh/Restaurant/blob/master/Restaurant/src/uk/co/nathanleigh/restaurant/CurrencyFormat.java

Answer 14

如果你的json货币字段是数字类型（而不是字符串），它可能是3.1,3.15或只是3.因为json会自动舍入数字字段。

在这种情况下，您可能需要对其进行舍入以便正确显示（并且以后可以在输入字段上使用遮罩）：

    NumberFormat nf = NumberFormat.getCurrencyInstance();

    float value = 200 // it can be 200, 200.3 or 200.37, BigDecimal will take care
    BigDecimal valueAsBD = BigDecimal.valueOf(value);
    valueAsBD.setScale(2, BigDecimal.ROUND_HALF_UP);

    String formated = nf.format(valueAsBD);

为什么需要这样做？

所有答案都指向在输入时删除货币符号，判断您是否正在收到美分，从而形成dolar + cents / 100 = dolar，美分。但是如果你的json货币字段是一个数字类型（而不是一个字符串），它将围绕你的分数，它可能是3,3.1或3.15。

Answer 15

经过过多的搜索，并以Doubles，BigDecimals等失败，我编写了这段代码。它即插即用。它在科特林。因此，为了帮助其他人像我一样坚持下去，放手。

该代码基本上是一个将放置textWatcher并将昏迷调整到正确位置的功能。

首先，创建此函数：

   <script>
 function myFunction() {
  var str = 'Hello" How are you';
  var patt = /[a-zA-Z0-9-.{}@!#$%&()":,?=+_-~?\s]/g; // describes all the special characters which are allowed.

  var result = str.match(patt);
   document.getElementById("demo").innerHTML = result;
 }
</script>

然后您以这种方式调用此函数

fun CurrencyWatcher( editText:EditText) {

    editText.addTextChangedListener(object : TextWatcher {
        //this will prevent the loop
        var changed: Boolean = false

        override fun afterTextChanged(p0: Editable?) {
            changed = false

        }

        override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {

            editText.setSelection(p0.toString().length)
        }

        @SuppressLint("SetTextI18n")
        override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
            if (!changed) {
                changed = true

                var str: String = p0.toString().replace(",", "").trim()
                var element0: String = str.elementAt(0).toString()
                var element1: String = "x"
                var element2: String = "x"
                var element3: String = "x"
                var element4: String = "x"
                var element5: String = "x"
                var element6: String = "x"

                //this variables will store each elements of the initials data for the case we need to move this numbers like: 0,01 to 0,11 or 0,11 to 0,01
                if (str.length >= 2) {
                    element1 = str.elementAt(1).toString()
                }
                if (str.length >= 3) {
                    element2 = str.elementAt(2).toString()
                }

                editText.removeTextChangedListener(this)


                //this first block of code will take care of the case
                //where the number starts with 0 and needs to adjusta the 0 and the "," place
                if (str.length == 1) {
                    str = "0,0" + str
                    editText.setText(str)

                } else if (str.length <= 3 && str == "00") {

                    str = "0,00"
                    editText.setText(str)
                    editText.setSelection(str.length)
                } else if (element0 == "0" && element1 == "0" && element2 == "0") {
                    str = str.replace("000", "")
                    str = "0,0" + str
                    editText.setText(str)
                } else if (element0 == "0" && element1 == "0" && element2 != "0") {
                    str = str.replace("00", "")
                    str = "0," + str
                    editText.setText(str)
                } else {

                    //This block of code works with the cases that we need to move the "," only because the value is bigger
                    //lets get the others elements
                    if (str.length >= 4) {
                        element3 = str.elementAt(3).toString()
                    }
                    if (str.length >= 5) {
                        element4 = str.elementAt(4).toString()
                    }
                    if (str.length >= 6) {
                        element5 = str.elementAt(5).toString()
                    }
                    if (str.length == 7) {
                        element6 = str.elementAt(6).toString()
                    }


                    if (str.length >= 4 && element0 != "0") {

                        val sb: StringBuilder = StringBuilder(str)
                        //set the coma in right place
                        sb.insert(str.length - 2, ",")
                        str = sb.toString()
                    }

                    //change the 0,11 to 1,11
                    if (str.length == 4 && element0 == "0") {

                        val sb: StringBuilder = StringBuilder(str)
                        //takes the initial 0 out
                        sb.deleteCharAt(0);
                        str = sb.toString()

                        val sb2: StringBuilder = StringBuilder(str)
                        sb2.insert(str.length - 2, ",")
                        str = sb2.toString()
                    }

                    //this will came up when its like 11,11 and the user delete one, so it will be now 1,11
                    if (str.length == 3 && element0 != "0") {
                        val sb: StringBuilder = StringBuilder(str)
                        sb.insert(str.length - 2, ",")
                        str = sb.toString()
                    }

                    //came up when its like 0,11 and the user delete one, output will be 0,01
                    if (str.length == 2 && element0 == "0") {
                        val sb: StringBuilder = StringBuilder(str)
                        //takes 0 out
                        sb.deleteCharAt(0);
                        str = sb.toString()

                        str = "0,0" + str

                    }

                    //came up when its 1,11 and the user delete, output will be 0,11
                    if (str.length == 2 && element0 != "0") {
                        val sb: StringBuilder = StringBuilder(str)
                        //retira o 0 da frente
                        sb.insert(0, "0,")
                        str = sb.toString()

                    }


                    editText.setText(str)
                }

                //places the selector at the end to increment the number
                editText.setSelection(str.length)
                editText.addTextChangedListener(this)
            }

        }
    })
}

Answer 16

这就像Saeid Mohammadi的回答，但是我改成接受负数。

Stack

Answer 17

public class MoneyEditText extends android.support.v7.widget.AppCompatEditText{
public MoneyEditText(Context context) {
    super(context);
    addTextChangedListener(MoneySplitter());
}
public MoneyEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
    addTextChangedListener(MoneySplitter());
}
public MoneyEditText(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    addTextChangedListener(MoneySplitter());
}
public TextWatcher MoneySplitter() {
    TextWatcher textWatcher = new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            try
            {
                removeTextChangedListener(this);
                String value = s.toString();
                if (!value.equals(""))
                {
                        if(!TextUtils.isEmpty(value))
                            setText(formatPrice(Double.parseDouble(value)));
                        setSelection(getText().toString().length());

                }
                addTextChangedListener(this);
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
                addTextChangedListener(this);
            }
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }
        @Override
        public void afterTextChanged(Editable s) {
        }
    };
    return textWatcher;
}

public static String formatPrice(double value){
        int DecimalPointNumber = 2;
        Locale locale = Locale.getDefault();
        DecimalFormat myFormatter = (DecimalFormat) NumberFormat.getCurrencyInstance(locale);
        StringBuilder sb = new StringBuilder();
        if(DecimalPointNumber>0){
            for (int i = 0; i < DecimalPointNumber; i++) {
                sb.append("#");
            }
            myFormatter.applyPattern("###,###."+ sb.toString());
        }else
            myFormatter.applyPattern("###,###"+ sb.toString());

            return Currency.getInstance(Locale.getDefault()).getSymbol() + myFormatter.format(value);
    }
}

，然后将此块用作您的editText

   <MoneyEditText
   android:id="@+id/txtPrice"
   android:layout_width="match_parent"
   android:layout_height="64dp"
   android:digits="0123456789.,"
   android:inputType="numberDecimal"
   android:selectAllOnFocus="true"
   android:singleLine="true" />

Answer 18

科特林版本：

    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)
            }
        }
    })

Answer 19

您可以使用这些方法

import android.text.Editable
import android.text.TextWatcher
import android.widget.EditText
import android.widget.TextView
import java.text.NumberFormat
import java.util.*

fun TextView.currencyFormat() {
    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) {
            removeTextChangedListener(this)
            text = if (s?.toString().isNullOrBlank()) {
                ""
            } else {
                s.toString().currencyFormat()
            }
            if(this@currencyFormat is EditText){
                setSelection(text.toString().length)
            }
            addTextChangedListener(this)
        }
    })
}

fun String.currencyFormat(): String {
    var current = this
    if (current.isEmpty()) current = "0"
    return try {
        if (current.contains('.')) {
            NumberFormat.getNumberInstance(Locale.getDefault()).format(current.replace(",", "").toDouble())
        } else {
            NumberFormat.getNumberInstance(Locale.getDefault()).format(current.replace(",", "").toLong())
        }
    } catch (e: Exception) {
        "0"
    }
}

Answer 20

在您的 XML 中使用此 inputType

android:inputType="numberSigned|numberDecimal"

添加这个不错的 Kotlin 扩展函数：

**
 * Use this function from [TextWatcher.afterTextChanged] it will first call [AppCompatEditText.removeTextChangedListener]
 * on the TextWatcher you pass, manipulate the text and then register it again after it call setText.
 *
 * @param fallback The String that we will return if the user is doing illegal adding, like trying to add a third digit after the comma.
 *                  It is best if you will keep the fallback as a member of the class the EditText resides in - and store in it
 * @param textWatcher [TextWatcher] It will be used to unregister before manipulating the text.
 * @param locale The locale that we will pass to [NumberFormat.getCurrencyInstance] - it will affect the currency sign. default is [Locale.US]
 *
 * @return A formatted String to use in [AppCompatEditText.setText]
 *
 */
fun AppCompatEditText.formatCurrency(@NonNull fallback: String, @NonNull textWatcher: TextWatcher,
                                     locale: Locale = Locale.US) {

    removeTextChangedListener(textWatcher)

    var original = text.toString()
    if (original.startsWith(".")) {
        // If the user press on '.-' key on the beginning of the amount - we are getting '.' and we turn it into '-'
        setText(original.replaceFirst(".", "-"))
        addTextChangedListener(textWatcher)
        setSelection(text?.length ?: 0)
        return
    }
    val split = original.split(".")
    when (split.size) {
        0 -> {
            setText(fallback)
            addTextChangedListener(textWatcher)
            setSelection(text?.length ?: 0)
            return
        }
        1 -> {
            if (split[0] == "-") {
                setText("-")
                addTextChangedListener(textWatcher)
                setSelection(text?.length ?: 0)
                return
            }
        }
        2 -> {
            if (split[1].length > 2) {
                setText(fallback)
                addTextChangedListener(textWatcher)
                setSelection(text?.length ?: 0)
                return
            }
        }
    }
    // We store the decimal value in a local variable
    val decimalSplit = original.split(".")
    // flag to indicate that we have a decimal part on the original String.
    val hasDecimal = decimalSplit.size > 1
    if (hasDecimal) {
        original = decimalSplit[0]
    }
    val isNegative = original.startsWith("-")
    val cleanString: String = original.replace("""[$,]""".toRegex(), "")

    val result = if (cleanString.isNotEmpty() && cleanString != "-") {
        val formatString = original.replace("""[-$,.]""".toRegex(), "")
        // Add Commas and Currency symbol.
        var result = NumberFormat.getCurrencyInstance(locale).format(formatString.toDouble())
        result = result.split('.')[0]
        if (isNegative) {
            // If it was negative we must add the minus sign.
            result = "-${result}"
        }
        if (hasDecimal) {
            // after the formatting the decimal is omitted, we need to append it.
            result = "${result}.${decimalSplit[1]}"
        }
        result
    } else {
        original
    }
    setText(result)
    addTextChangedListener(textWatcher)
    setSelection(text?.length ?: 0)
}

像这样使用它：

class MyCoolClass{
  
    private var mLastAmount = ""
    ...
    ...

    private fun addTextWatcherToEt() {
            mEtAmount.addTextChangedListener(object : TextWatcher {
    
                override fun afterTextChanged(s: Editable?) {
                    mEtAmount.formatCurrency(mLastAmount, this)
                    mLastAmount = mEtAmount.text.toString()
                    
                    // Do More stuff here if you need...
                }
    
                override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
                }
    
                override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
    
                }
            })
        }

}

Answer 21

只是对已批准答案的补充评论。由于解析，在edittext字段上移动光标时可能会崩溃。我做了一个try catch语句，但是实现了你自己的代码。

@Override public void onTextChanged(CharSequence s, int start, int before, int count) {
        if(!s.toString().equals(current)){
        amountEditText.removeTextChangedListener(this);

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

            try{
                double parsed = Double.parseDouble(cleanString);
                String formatted = NumberFormat.getCurrencyInstance().format((parsed/100));
                current = formatted;
                amountEditText.setText(formatted);
                amountEditText.setSelection(formatted.length());
            } catch (Exception e) {

            }

            amountEditText.addTextChangedListener(this);
        }
    }

Answer 22

如果有人对使用RxBinding和Kotlin的方式感兴趣：

var isEditing = false

RxTextView.textChanges(dollarValue)
            .filter { !isEditing }
            .filter { it.isNotBlank() }
            .map { it.toString().filter { it.isDigit() } }
            .map { BigDecimal(it).setScale(2, BigDecimal.ROUND_FLOOR).divide(100.toBigDecimal(), BigDecimal.ROUND_FLOOR) }
            .map { NumberFormat.getCurrencyInstance(Locale("pt", "BR")).format(it) }
            .subscribe {
                isEditing = true
                dollarValue.text = SpannableStringBuilder(it)
                dollarValue.setSelection(it.length)
                isEditing = false
            }

Answer 23

以下是我能够在EditText中显示货币的方法，该货币易于实现并且对用户来说效果很好，而且不会出现疯狂的符号。在EditText不再具有焦点之前，这不会尝试进行任何格式化。用户仍然可以返回并进行任何编辑而不会危及格式化。我使用'formattedPrice'变量仅用于显示，'itemPrice'变量用作我存储/用于计算的值。

它似乎工作得很好，但我只是在这几个星期，所以任何建设性的批评是绝对欢迎的！

xml中的EditText视图具有以下属性：

android:inputType="numberDecimal"

全局变量：

private String formattedPrice;
private int itemPrice = 0;

在onCreate方法中：

EditText itemPriceInput = findViewById(R.id.item_field_price);

itemPriceInput.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        String priceString = itemPriceInput.getText().toString();

        if (! priceString.equals("")) {
            itemPrice = Double.parseDouble(priceString.replaceAll("[$,]", ""));
            formattedPrice = NumberFormat.getCurrencyInstance().format(itemPrice);
            itemPriceInput.setText(formattedPrice);
        }
    }
});

Answer 24

CurrencyTextWatcher.java

public class CurrencyTextWatcher implements TextWatcher {

    private final static String DS = "."; //Decimal Separator
    private final static String TS = ","; //Thousands Separator
    private final static String NUMBERS = "0123456789"; //Numbers
    private final static int MAX_LENGTH = 13; //Maximum Length

    private String format;

    private DecimalFormat decimalFormat;
    private EditText editText;

    public CurrencyTextWatcher(EditText editText) {
        String pattern = "###" + TS + "###" + DS + "##";
        decimalFormat = new DecimalFormat(pattern);
        this.editText = editText;
        this.editText.setInputType(InputType.TYPE_CLASS_NUMBER);
        this.editText.setKeyListener(DigitsKeyListener.getInstance(NUMBERS + DS));
        this.editText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(MAX_LENGTH)});
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void afterTextChanged(Editable editable) {

        editText.removeTextChangedListener(this);
        String value = editable.toString();
        if (!value.isEmpty()) {
            value = value.replace(TS, "");
            try {
                format = decimalFormat.format(Double.parseDouble(value));
                format = format.replace("0", "");
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }

            editText.setText(format);
        }

        editText.addTextChangedListener(this);
    }
}

EditTextCurrency.java

public class EditTextCurrency extends AppCompatEditText {
    public EditTextCurrency(Context context) {
        super(context);
    }

    public EditTextCurrency(Context context, AttributeSet attrs) {
        super(context, attrs);
        addTextChangedListener(new CurrencyTextWatcher(this));
    }
}

Answer 25

另一种方法，但基于Guilherme answer。当您的国家/地区区域设置不可用或您要使用自定义货币符号时，此方法很有用。此实现仅适用于正十进制。

此代码位于Kotlin，setMaskingMoney

的第一个代理人EditText

fun EditText.setMaskingMoney(currencyText: String) {
    this.addTextChangedListener(object: MyTextWatcher{
        val editTextWeakReference: WeakReference<EditText> = WeakReference<EditText>(this@setMaskingMoney)
        override fun afterTextChanged(editable: Editable?) {
            val editText = editTextWeakReference.get() ?: return
            val s = editable.toString()
            editText.removeTextChangedListener(this)
            val cleanString = s.replace("[Rp,. ]".toRegex(), "")
            val newval = currencyText + cleanString.monetize()

            editText.setText(newval)
            editText.setSelection(newval.length)
            editText.addTextChangedListener(this)
        }
    })
}

然后MyTextWatcher接口应该从TextWatcher扩展。由于我们只需要afterTextChanged方法，因此其他方法需要覆盖此接口

interface MyTextWatcher: TextWatcher {
    override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}
    override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}
}

和货币化方法是：

fun String.monetize(): String = if (this.isEmpty()) "0"
    else DecimalFormat("#,###").format(this.replace("[^\\d]".toRegex(),"").toLong())

完整实施：

fun EditText.setMaskingMoney(currencyText: String) {
    this.addTextChangedListener(object: MyTextWatcher{
        val editTextWeakReference: WeakReference<EditText> = WeakReference<EditText>(this@setMaskingMoney)
        override fun afterTextChanged(editable: Editable?) {
            val editText = editTextWeakReference.get() ?: return
            val s = editable.toString()
            editText.removeTextChangedListener(this)
            val cleanString = s.replace("[Rp,. ]".toRegex(), "")
            val newval = currencyText + cleanString.monetize()

            editText.setText(newval)
            editText.setSelection(newval.length)
            editText.addTextChangedListener(this)
        }
    })
}

interface MyTextWatcher: TextWatcher {
    override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}
    override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}
}


fun String.monetize(): String = if (this.isEmpty()) "0"
    else DecimalFormat("#,###").format(this.replace("[^\\d]".toRegex(),"").toLong())

以及onCreate方法的某个地方：

yourTextView.setMaskingMoney("Rp. ")

Answer 26

我已经实现了Kotlin + Rx版本。

这是巴西的货币（例如1,500.00 - 5,21 - 192,90），但您可以轻松适应其他格式。

希望其他人觉得它有用。

<input>

Answer 27

使用TextWatcher，InputFilter或像CurrencyEditText之类的库查看大多数StackOverflow帖子以实现此目的后，我已经使用{x}}这个简单的解决方案OnFocusChangeListener。

逻辑是在焦点聚焦时将EditText解析为数字，并在失去焦点时将其格式化。

amount.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean hasFocus) {
            Number numberAmount = 0f;
            try {
                numberAmount = Float.valueOf(amount.getText().toString());
            } catch (NumberFormatException e1) {
                e1.printStackTrace();
                try {
                    numberAmount = NumberFormat.getCurrencyInstance().parse(amount.getText().toString());
                } catch (ParseException e2) {
                    e2.printStackTrace();
                }
            }
            if (hasFocus) {
                amount.setText(numberAmount.toString());
            } else {
                amount.setText(NumberFormat.getCurrencyInstance().format(numberAmount));
            }
        }
    });

格式化货币输入editText的更好方法？

27 个答案: