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public
class
InputLengthControler { private
EditText mEditText; private
TextView mHintTextView; private
final
String hint_remain_count = "您还可以输入%s字"; private
final
String hint_max_length_msg = "最多只能输入%s字"; private
int
MAX_LENGTH = 140; public
void
config(EditText inputBox, int
maxLength, TextView lengthHintView) { MAX_LENGTH
= maxLength; mEditText
= inputBox; mHintTextView
= lengthHintView; mEditText.addTextChangedListener(watcher); updateLengthHint(MAX_LENGTH); } private
TextWatcher watcher = new
TextWatcher() { @Override public
void
onTextChanged(CharSequence s, int
start, int
before, int
count) { } @Override public
void
beforeTextChanged(CharSequence s, int
start, int
count, int
after) { } @Override public
void
afterTextChanged(Editable s) { if
(mEditText.getText().length() > MAX_LENGTH) { String
str = mEditText.getText().toString(); if
(str != null
&& str.length() > 10)
{ str
= str.substring(0,
MAX_LENGTH); mEditText.setText(str); mEditText.setSelection(str.length()); } toast(String.format(hint_max_length_msg,
MAX_LENGTH)); } int
enableCount = MAX_LENGTH; Editable
curContent = mEditText.getText(); if
(curContent != null
&& curContent.length() > 0)
{ enableCount
= MAX_LENGTH - curContent.length(); } updateLengthHint(enableCount); } }; private
void
updateLengthHint(int
enableCount) { if
(enableCount < 0)
{ enableCount
= 0; }
else
if
(enableCount > MAX_LENGTH) { enableCount
= MAX_LENGTH; } mHintTextView.setText(String.format(hint_remain_count,
enableCount)); } private
void
toast(String msg) { Context
context; if
(msg != null
&& (context = getContext()) != null)
{ Toast.makeText(context,
msg, Toast.LENGTH_SHORT).show(); } } private
Context getContext() { if
(mEditText != null)
{ return
mEditText.getContext(); } return
null; }}//////////////////////////////////////////////////////////////////////////////////// InputLengthControler
ilc = new
InputLengthControler(); EditText
inputBox = (EditText) findViewById(R.id.xx); final
int
maxLength = 140; TextView
lengthHintView = (TextView) findViewById(R.id.xxxxx); ilc.config(inputBox,
maxLength, lengthHintView); |
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原文地址：http://blog.csdn.net/u014311042/article/details/42644683
