package com.wpc.library.util;
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import android.text.InputFilter;
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import android.text.Spanned;
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/**
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* Edittext 小数点后输入位数限制
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*/
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public class DecimalDigitsInputFilter implements InputFilter {
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private final int decimalDigits;
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/**
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* Constructor.
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*
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* @param decimalDigits maximum decimal digits
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*/
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public DecimalDigitsInputFilter(int decimalDigits) {
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this.decimalDigits = decimalDigits;
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}
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@Override
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public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
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int dotPos = -1;
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int len = dest.length();
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for (int i = 0; i < len; i++) {
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char c = dest.charAt(i);
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if (c == '.' || c == ',') {
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dotPos = i;
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break;
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}
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}
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if (dotPos >= 0) {
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// protects against many dots
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if (source.equals(".") || source.equals(",")) {
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return "";
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}
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// if the text is entered before the dot
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if (dend <= dotPos) {
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return null;
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}
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if (len - dotPos > decimalDigits) {
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return "";
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}
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} else {
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if (dest.length() >= 1 && dest.charAt(0) == '0' && !source.equals(".")) {
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return "";
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}
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}
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return null;
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}
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}
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