格式化货币输入editText的更好方法？

Question

我有一个editText,起始值是0.00美元.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

这是有效的,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.例如,如果他们试图删除$,它将删除一个数字.

这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

基于上面的一些答案,我创建了一个MoneyTextWatcher,你可以使用如下:

priceEditText.addTextChangedListener(new MoneyTextWatcher(priceEditText));

这是班级:

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

这是我的习惯 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;

在github上演示

Answer 4

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.

更换:

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

附:

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

Answer 5

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

fun EditText.addCurrencyFormatter() {

    // Reference: /sf/ask/357553101/#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: /sf/ask/357553101/#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 中的一个扩展函数，它将 TextWatcher 添加到 EditText 的 TextChangedListener 中。

为了使用它，只需：

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

我希望它有帮助。

Answer 6

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 7

尽管这里有很多答案，但我想分享我在这里找到的代码，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) { }

}

希望能帮助到你。