如何在编辑EditText字段时重新定位光标，该字段的格式类似于美国货币-Android

我正在按照美国货币格式设置编辑文本字段的格式，在该字段中输入数字时，假设“ 12345678”看起来像“ 12,345,678”。为此，我TextWatcher在afterTextChanged(...)方法上使用了格式化输入的文本的格式：

@Override
    public void afterTextChanged(Editable editable) {
        String str = editable.toString();
        String number = str.replaceAll("[,]", "");
        if (number.equals(previousNumber) || number.isEmpty()) {
            return;
        }
        previousNumber = number;

        DecimalFormat formatter = new DecimalFormat("#,###.##", new DecimalFormatSymbols(Locale.US));

        String formattedString = formatter.format(number);
        editText.setText(formattedString);
    }

另外，我正在使用onSelectionChanged(...)类似的回调方法：

 @Override
protected void onSelectionChanged(int selStart, int selEnd) {
    this.setSelection(selStart);
}

但是在这里，此“ selStart”不返回数字的实际长度，因为它排除了每种货币中的“，”数字。例如：对于“ 12,345,678”，它返回的计数为8而不是10。这就是为什么我不能将光标放在该字段的末尾。

以下是我正在使用的自定义EditText的代码：

public class CurrencyEditText extends AppCompatEditText {
private static final int MAX_LENGTH = 16;
private static final int MAX_DECIMAL_DIGIT = 2;
private static String prefix = "";
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);
}

@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);
}

private void handleCaseCurrencyEmpty(boolean focused) {
    if (!focused) {
        if (getText().toString().equals(prefix)) {
            setText("");
        }
    }
}

private static class CurrencyTextWatcher implements TextWatcher {
    private final EditText editText;
    DecimalFormat formatter;
    private String previousNumber;
    private String prefix;
    Context mContext;

    CurrencyTextWatcher(EditText editText, String prefix) {
        this.editText = editText;
        this.prefix = prefix;
        formatter = new DecimalFormat("#,###.##", new DecimalFormatSymbols(Locale.US));
    }

    @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) {
        String str = editable.toString();
        String number = str.replaceAll("[,]", "");
        if (number.equals(previousNumber) || number.isEmpty()) {
            return;
        }
        previousNumber = number;

        String formattedString = prefix + formatNumber(number);
        editText.removeTextChangedListener(this);
        editText.setText(formattedString);
        //handleSelection();
        editText.addTextChangedListener(this);
    }

    private String formatNumber(String number) {
        if (number.contains(".")) {
            return formatDecimal(number);
        }
        return formatInteger(number);
    }

    private String formatInteger(String str) {
        BigDecimal parsed = new BigDecimal(str);
        return formatter.format(parsed);
    }

    private String formatDecimal(String str) {
        if (str.equals(".")) {
            return "0.";
        }
        BigDecimal parsed = new BigDecimal(str);
        DecimalFormat formatter = new DecimalFormat("#,##0." + getDecimalPattern(str),
                new DecimalFormatSymbols(Locale.US));
        formatter.setRoundingMode(RoundingMode.DOWN);
        return formatter.format(parsed);
    }

    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_DIGIT; i++) {
            decimalPattern.append("0");
        }
        return decimalPattern.toString();
    }

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

@Override
protected void onSelectionChanged(int selStart, int selEnd) {
    this.setSelection(selStart);
}

}

我不想使用，this.setSelection(lengthOfTheEnteredText)因为它在您编辑字段时创建了问题！onSelectionChanged(...)不考虑数字“，”计数的原因可能是什么？