输入框输入金额

用法

//第一种 // InputFilter[] filters = {new CashierInputFilter()}; // edShopPrice.setFilters(filters); // edMarketPrice.setFilters(filters); //第二种 edShopPrice.setFilters(new InputFilter[]{new MoneyValueFilter().setDigits(2)}); edMarketPrice.setFilters(new InputFilter[]{new MoneyValueFilter().setDigits(2)});

这个不会补全0. 会限制输入最大数

public class CashierInputFilter implements InputFilter { Pattern mPattern; //输入的最大金额 private static final int MAX_VALUE = Integer.MAX_VALUE; //小数点后的位数 private static final int POINTER_LENGTH = 2; private static final String POINTER = "."; private static final String ZERO = "0"; public CashierInputFilter() { mPattern = Pattern.compile("([0-9]|\\.)*"); } /** * @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 ""; } } //验证小数点精度，保证小数点后只能输入两位 int index = destText.indexOf(POINTER); int length = dend - index; if (dstart > index && destText.length() - index > POINTER_LENGTH) { return ""; } } 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 { if ((POINTER.equals(source) || ZERO.equals(source)) && TextUtils.isEmpty(destText)) { return ""; } } } //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; } }

先输小数点自动补全0.

public class MoneyValueFilter extends DigitsKeyListener { private static final String TAG = "MoneyValueFilter"; public MoneyValueFilter() { super(false, true); } private int digits = 2; public MoneyValueFilter setDigits(int d) { digits = d; return this; } @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { CharSequence out = super.filter(source, start, end, dest, dstart, dend); // if changed, replace the source if (out != null) { source = out; start = 0; end = out.length(); } int len = end - start; // if deleting, source is empty // and deleting can't break anything if (len == 0) { return source; } //以点开始的时候，自动在前面添加0 if(source.toString().equals(".") && dstart == 0){ return "0."; } //如果起始位置为0,且第二位跟的不是".",则无法后续输入 if(!source.toString().equals(".") && dest.toString().equals("0")){ return ""; } int dlen = dest.length(); // Find the position of the decimal . for (int i = 0; i < dstart; i++) { if (dest.charAt(i) == '.') { // being here means, that a number has // been inserted after the dot // check if the amount of digits is right return (dlen-(i+1) + len > digits) ? "" : new SpannableStringBuilder(source, start, end); } } for (int i = start; i < end; ++i) { if (source.charAt(i) == '.') { // being here means, dot has been inserted // check if the amount of digits is right if ((dlen-dend) + (end-(i + 1)) > digits) return ""; else break; // return new SpannableStringBuilder(source, start, end); } } // if the dot is after the inserted part, // nothing can break return new SpannableStringBuilder(source, start, end); } }