Example usage for android.text TextUtils getChars

Introduction

In this page you can find the example usage for android.text TextUtils getChars.

Prototype

public static void getChars(CharSequence s, int start, int end, char[] dest, int destoff) 

Source Link

Usage

From source file:org.totschnig.myexpenses.util.Utils.java

public static void configDecimalSeparator(final EditText editText, final char decimalSeparator,
        final int fractionDigits) {
    // mAmountText.setInputType(
    // InputType.TYPE_CLASS_NUMBER|InputType.TYPE_NUMBER_FLAG_DECIMAL);
    // due to bug in Android platform
    // http://code.google.com/p/android/issues/detail?id=2626
    // the soft keyboard if it occupies full screen in horizontal orientation
    // does not display the , as comma separator
    // TODO we should take into account the arab separator as well
    final char otherSeparator = decimalSeparator == '.' ? ',' : '.';
    editText.setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI);
    editText.setFilters(new InputFilter[] { new InputFilter() {
        @Override/*  w w w. j a  va  2s  .  c o m*/
        public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
                int dend) {
            int separatorPositionInDest = dest.toString().indexOf(decimalSeparator);
            char[] v = new char[end - start];
            TextUtils.getChars(source, start, end, v, 0);
            String input = new String(v).replace(otherSeparator, decimalSeparator);
            if (fractionDigits == 0 || separatorPositionInDest != -1 || dest.length() - dend > fractionDigits) {
                input = input.replace(String.valueOf(decimalSeparator), "");
            } else {
                int separatorPositionInSource = input.lastIndexOf(decimalSeparator);
                if (separatorPositionInSource != -1) {
                    //we make sure there is only one separator in the input and after the separator we do not use
                    //more minor digits as allowed
                    int existingMinorUnits = dest.length() - dend;
                    int additionalAllowedMinorUnits = fractionDigits - existingMinorUnits;
                    int additionalPossibleMinorUnits = input.length() - separatorPositionInSource - 1;
                    int extractMinorUnits = additionalPossibleMinorUnits >= additionalAllowedMinorUnits
                            ? additionalAllowedMinorUnits
                            : additionalPossibleMinorUnits;
                    input = input.substring(0, separatorPositionInSource)
                            .replace(String.valueOf(decimalSeparator), "") + decimalSeparator
                            + (extractMinorUnits > 0 ? input.substring(separatorPositionInSource + 1,
                                    separatorPositionInSource + 1 + extractMinorUnits) : "");
                }
            }
            if (fractionDigits == 0) {
                return input;
            }
            if (separatorPositionInDest != -1 && dend > separatorPositionInDest
                    && dstart > separatorPositionInDest) {
                int existingMinorUnits = dest.length() - (separatorPositionInDest + 1);
                int remainingMinorUnits = fractionDigits - existingMinorUnits;
                if (remainingMinorUnits < 1) {
                    return "";
                }
                return input.length() > remainingMinorUnits ? input.substring(0, remainingMinorUnits) : input;
            } else {
                return input;
            }
        }
    }, new InputFilter.LengthFilter(16) });
}

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