edittext 特殊字符过滤和字符长度限制

// 设置过滤字符函数(过滤掉我们不需要的字符)

public static String stringFilter(String str)throws PatternSyntaxException{

String regEx = "[/\\:*?<>|\"\n\t]";

Pattern p = Pattern.compile(regEx);

Matcher m = p.matcher(str);

return m.replaceAll("");

}

int mMaxLenth = 50；

mEditText.addTextChangedListener(new TextWatcher() {

private int cou = 0;

int selectionEnd = 0;

@Override

public void onTextChanged(CharSequence s, int start, int before,

int count) {

cou = before + count;

String editable = mEditText.getText().toString();

String str = stringFilter(editable);

if (!editable.equals(str)) {

mEditText.setText(str);

}

mEditText.setSelection(mEditText.length());

cou = mEditText.length();

}

@Override

public void beforeTextChanged(CharSequence s, int start, int count,

int after) {

}

@Override

public void afterTextChanged(Editable s) {

if (cou > mMaxLenth) {

selectionEnd = mEditText.getSelectionEnd();

s.delete(mMaxLenth, selectionEnd);

if(androidVersion.charAt(0)>='4')

{

mEditText.setText(s.toString());

}

}

}

});