AndroidのInputFillter之按字元過濾長度，一個中文當兩個字元

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/** * 以Byte數的方式來實現的LengthFilter * @author bvin */public class OneByteInputFilter implements InputFilter{    private final int mMax;        public OneByteInputFilter(int mMax) {        super();        this.mMax = mMax;    }    @Override    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,                    int dend) {        //int remainLength = dest.length()-(dend-dstart);                CharSequence placeStart = dest.subSequence(0, dstart);        CharSequence placeEnd = dest.subSequence(dend, dest.length());                int placeStartLength = Util.computeLenthByByte(placeStart.toString());        int placeEndLength = Util.computeLenthByByte(placeEnd.toString());                int canReplaceSize = mMax-placeStartLength-placeEndLength;                if (canReplaceSize>0) {            CharSequence sourceSpan = source.subSequence(start, end);            int sourceSpanLength = Util.computeLenthByByte(sourceSpan.toString());            if (sourceSpanLength>=canReplaceSize) {//替換內容長度大於可容納長度                String result = fixSplit(sourceSpan.toString(), canReplaceSize, false);                if (!TextUtils.isEmpty(result)) {                    return result;                }else {                    return "";                }                            }else {                return null;            }                    }else {            return "";        }          }    private static String fixSplit(String s,int sum,boolean debug){        int counter = 0;        String fixString = null;        for (int i = 0; i < s.length(); i++) {            if (counter>=sum) {                break;            }            int length = (s.charAt(i)+"").getBytes().length;            if(length>1){                counter += 2;                if (counter<=sum) {                    fixString = s.substring(0, i+1);                }            } else if (length==1){                if (counter<=sum) {                    fixString = s.substring(0, i+1);                }                ++counter;            }else {//小於1                continue;            }                        /*if (counter>=sum) {                System.out.println("break；"+counter);                break;            }else {                fixString = s.substring(0, i+1);            }*/        }        return fixString;    }}

 

AndroidのInputFillter之按字元過濾長度，一個中文當兩個字元