帮助里就有啊
! If a ! character appears in the mask, optional characters are
represented in the EditText as leading blanks. If a ! character
is not present, optional characters are represented in the
EditText as trailing blanks.
> If a > character appears in the mask, all characters that follow
are in uppercase until the end of the mask or until a <character
is encountered.
< If a <character appears in the mask, all characters that follow
are in lowercase until the end of the mask or until a > character
is encountered.
<> If these two characters appear together in a mask, no case checking
is done and the data is formatted with the case the user uses to
enter the data.
/ The character that follows a / character is a literal character.
Use this character to use any of the mask special characters as
a literal in the data.
L The L character requires an alphabetic character only in this
position. For the US, this is A-Z, a-z.
l The l character permits only an alphabetic character in this
position, but doesn't require it.
A The A character requires an alphanumeric character only in
this position. For the US, this is A-Z, a-z, 0-9.
a The a character permits an alphanumeric character in this
position, but doesn't require it.
C The C character requires an arbitrary character in this position.
c The c character permits an arbitrary character in this position,
but doesn't require it.
0 The 0 character requires a numeric character only in this position.
9 The 9 character permits a numeric character in this position,
but doesn't require it.
# The # character permits a numeric character or a plus or minus sign
in this position, but doesn't require it.
: The : character is used to separate hours, minutes, and seconds in
times. If the character that separates hours, minutes, and seconds
is different in the regional settings of the Control Panel utility
on your computer system, that character is used instead.
/ The / character is used to separate months, days, and years in dates.
If the character that separates months, days, and years is different
in the regional settings of the Control Panel utility on your
computer system, that character is used instead.
; The ; character is used to separate the three fields of the mask.
_ The _ character automatically inserts spaces into the text.
When the user enters characters in the field, the cursor skips
the _ character.
