android:inputType="numberDecimal"

/** 輸入框小數(shù)的位數(shù)*/private static final int DECIMAL_DIGITS = 1;

InputFilter lengthfilter = new InputFilter() {  public CharSequence filter(CharSequence source, int start, int end,                Spanned dest, int dstart, int dend) {    // 刪除等特殊字符，直接返回    if ("".equals(source.toString())) {      return null;    }    String dValue = dest.toString();    String[] splitArray = dValue.split("//.");    if (splitArray.length > 1) {      String dotValue = splitArray[1];      int diff = dotValue.length() + 1 - DECIMAL_DIGITS;      if (diff > 0) {        return source.subSequence(start, end - diff);      }    }    return null;  }};et_content.setFilters(new InputFilter[] { lengthfilter });