package com.dollearn.student.utils;
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import android.text.InputFilter;
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import android.text.Spanned;
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import android.text.TextUtils;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* author：Created by ZHT on 2017/12/25 10:38
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* email：526309416@qq.com
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* desc：输入大小限制(整数 /首位不能输入0)
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*/
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public class IntegerInputFilter implements InputFilter {
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private Pattern mPattern;
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//输入的最大金额
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private static double MAX_VALUE = Integer.MAX_VALUE;
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public IntegerInputFilter(int maxValue) {
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MAX_VALUE = maxValue;
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mPattern = Pattern.compile("([0-9])*");
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}
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/**
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* @param source 新输入的字符串
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* @param start 新输入的字符串起始下标，一般为0
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* @param end 新输入的字符串终点下标，一般为source长度-1
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* @param dest 输入之前文本框内容
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* @param dstart 原内容起始坐标，一般为0
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* @param dend 原内容终点坐标，一般为dest长度-1
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* @return 输入内容
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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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String sourceText = source.toString();
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String destText = dest.toString().trim();
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//验证删除等按键
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if (TextUtils.isEmpty(sourceText)) {
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return "";
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}
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Matcher matcher = mPattern.matcher(source);
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if (!matcher.matches()) {
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return "";
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}
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if (destText.length() == 0 && sourceText.equals("0")) {
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return "";
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}
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//验证输入金额的大小
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double sumText = Double.parseDouble(destText + sourceText);
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if (MAX_VALUE > 0 && sumText > MAX_VALUE) {
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return dest.subSequence(dstart, dend);
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}
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return dest.subSequence(dstart, dend) + sourceText;
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}
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}
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