1 需要输入金额的时候,限制输入两位小数,以及小数点不能出现在第一位,只能输入一个小数点
amountInput.setFilters(new InputFilter[]{new InputFilter() {//设置输入两位小数
@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
if (source.equals(".") && dest.toString().length() == 0) {
return "0.";
}
if (dest.toString().contains(".")) {
int index = dest.toString().indexOf(".");
int mlength = dest.toString().substring(index).length();
if (mlength == 3) {
return "";
}
}
return null;
}
}});
2 监听银行卡号的输入,每四位一个空格
changeCardNumber.addTextChangedListener(new TextWatcher() { int beforeTextLength = 0; int onTextLength = 0; boolean isChanged = false; int location = 0;// 记录光标的位置 private char[] tempChar; private StringBuffer buffer = new StringBuffer(); int konggeNumberB = 0; @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { beforeTextLength = s.length(); if (buffer.length() > 0) { buffer.delete(0, buffer.length()); } konggeNumberB = 0; for (int i = 0; i < s.length(); i++) { if (s.charAt(i) == ' ') { konggeNumberB++; } } } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { onTextLength = s.length(); buffer.append(s.toString()); if (onTextLength == beforeTextLength || onTextLength <= 3 || isChanged) { isChanged = false; return; } isChanged = true; } @Override public void afterTextChanged(Editable s) { if (isChanged) { location = changeCardNumber.getSelectionEnd(); int index = 0; while (index < buffer.length()) { if (buffer.charAt(index) == ' ') { buffer.deleteCharAt(index); } else { index++; } } index = 0; int konggeNumberC = 0; while (index < buffer.length()) { if ((index == 4 || index == 9 || index == 14 || index == 19)) { buffer.insert(index, ' '); konggeNumberC++; } index++; } if (konggeNumberC > konggeNumberB) { location += (konggeNumberC - konggeNumberB); } tempChar = new char[buffer.length()]; buffer.getChars(0, buffer.length(), tempChar, 0); String str = buffer.toString(); if (location > str.length()) { location = str.length(); } else if (location < 0) { location = 0; } changeCardNumber.setText(str); Editable etable = changeCardNumber.getText(); Selection.setSelection(etable, location); isChanged = false; } } });用String.replace的方法获取到不带空格的字符串
3 不四舍五入的截取小数点后两位
DecimalFormat format=new DecimalFormat("#.00"); format.setRoundingMode(RoundingMode.FLOOR); double tt=Double.parseDouble(format.format(num));