这是一个示例InputFilter，它仅允许在小数点前最多4位，在小数点后最多1位。
价值观是允许的EditText：555.2，555，0.2
价值观是的EditText块：55555.2，055.2，555.42
InputFilter filter = new InputFilter() {
final int maxDigitsBeforeDecimalPoint=4;
final int maxDigitsAfterDecimalPoint=1;
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
StringBuilder builder = new StringBuilder(dest);
builder.replace(dstart, dend, source
.subSequence(start, end).toString());
if (!builder.toString().matches(
"(([1-9]{1})([0-9]{0,"+(maxDigitsBeforeDecimalPoint-1)+"})?)?(\\.[0-9]{0,"+maxDigitsAfterDecimalPoint+"})?"
)) {
if(source.length()==0)
return dest.subSequence(dstart, dend);
return "";
}
return null;
}
};
mEdittext.setFilters(new InputFilter[] { filter });
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