editText.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL); //默认控制输入10位数,小数点前7位,后2位,小数一位,共10位 InputFilter[] filters={new CashierInputFilter(10),new InputFilter.LengthFilter(10)}; editText.setFilters(filters); ---------------------------------------------- /** * @author liudong</br> * 描述:EditText输入框中过滤输入指定金额格式</br> * 1.小数点前7位数</br> * 2.小数点后2位数 * * */ public class CashierInputFilter implements InputFilter { private Pattern mPattern; //输入的最大金额 private final int MAX_VALUE = Integer.MAX_VALUE; //小数点后的2位数 private final int POINTER_AFTER_LENGTH = 2; //小数点前的7位数 private int POINTER_BEFORE_LENGTH = 7; private final String POINTER = "."; private static final String ZERO = "0"; public CashierInputFilter() { mPattern = Pattern.compile("([0-9]|\\.)*"); } public CashierInputFilter(int _maxLength) { mPattern = Pattern.compile("([0-9]|\\.)*"); POINTER_BEFORE_LENGTH=_maxLength-POINTER_AFTER_LENGTH-1; } /** * @param source 新输入的字符串 * @param start 新输入的字符串起始下标,一般为0 * @param end 新输入的字符串终点下标,一般为source长度-1 * @param dest 输入之前文本框内容 * @param dstart 原内容起始坐标,一般为0 * @param dend 原内容终点坐标,一般为dest长度-1 * @return 输入内容 */ @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { String sourceText = source.toString(); String destText = dest.toString(); //验证删除等按键 if (TextUtils.isEmpty(sourceText)) { return ""; } Matcher matcher = mPattern.matcher(source); //已经输入小数点的情况下,只能输入数字 if(destText.contains(POINTER)) { if (!matcher.matches()) { return ""; } else { if (POINTER.equals(source)) { //只能输入一个小数点 return ""; } } int index = destText.indexOf(POINTER); //验证小数点精度,保证小数点后只能输入两位 int afterLength = dend - index; // 输入后,修改控制不了,//验证小数点精度,保证小数点前位数 if(dstart==POINTER_BEFORE_LENGTH && index==POINTER_BEFORE_LENGTH) { return dest.subSequence(dstart, dend); } //验证小数点精度,保证小数点后只能输入两位 if (afterLength > POINTER_AFTER_LENGTH) { return dest.subSequence(dstart, dend); } } else { //没有输入小数点的情况下,只能输入小数点和数字,但首位不能输入小数点和0 if (!matcher.matches()) { return ""; } else { //验证小数点精度,保证小数点前只能输入7位 if(dstart==POINTER_BEFORE_LENGTH){ if(sourceText.contains(POINTER)) return dest.subSequence(dstart,dend)+ sourceText+ZERO+ZERO; else return dest.subSequence(dstart,dend)+POINTER+ZERO+ZERO; } if ((POINTER.equals(source) || ZERO.equals(source)) && TextUtils.isEmpty(destText)) { return ZERO+POINTER+ZERO+ZERO; } } } //验证输入金额的大小 double sumText = Double.parseDouble(destText + sourceText); if (sumText >=MAX_VALUE) { return dest.subSequence(dstart, dend); } return dest.subSequence(dstart, dend) + sourceText; } }
android 开发,editText中控制金额字段输入小数点前面位数
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转载自913.iteye.com/blog/2314143
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