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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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