nougat.png
备注
这个需求是大家经常用到的，比如在控制用户名输入时经常要用到。
此方法是设置文本监听器，省事，好用，且ROM，平台无关。
code
private static final String SPECIAL_CHARACTERS = "[\"\"''`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~！
@#￥%……&*（）—-—+|{}【】‘；：”“’。，、？]";
private static final Pattern NAME_PATTERN;
static {
NAME_PATTERN = Pattern.compile(SPECIAL_CHARACTERS);
}
private TextWatcher textWatcher = new TextWatcher() {
private int editStart;
private int editEnd;
private int maxLen = 20;
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
editStart = mEditText.getSelectionStart();
editEnd = mEditText.getSelectionEnd();
mEditText.removeTextChangedListener(textWatcher);
if (!TextUtils.isEmpty(mEditText.getText())) {
String etstring = mEditText.getText().toString().trim();
while (calculateLength(s.toString()) > maxLen) {
s.delete(editStart - 1, editEnd);
editStart--;
editEnd--;
}
}
mEditText.setText(s);
mEditText.setSelection(editStart);
Matcher m = NAME_PATTERN.matcher(s);
if( m.find()){
ToastUtils.showToast(mContext, R.string.robot_name_error);
editStart = mEditText.getSelectionStart();
s.delete( mEditText.getSelectionEnd() - 1, mEditText.getSelectionEnd());
mEditText.setText(s);
mEditText.setSelection(editStart - 1);
}
mEditText.addTextChangedListener(textWatcher);
}
private int calculateLength(String etstring) {
char[] ch = etstring.toCharArray();
int varlength = 0;
for (int i = 0; i < ch.length; i++) {
if ((ch[i] >= 0x2E80 && ch[i] <= 0xFE4F) || (ch[i] >= 0xA13F
&& ch[i] <= 0xAA40) || ch[i] >= 0x80) {
varlength = varlength + 2;
} else {
varlength++;
}
}
return varlength;
}
};
使用时，只需要
mEditText.addTextChangedListener(textWatcher);
或者使用自定义的EditText类，我写的，目前而言，扩展性实用性还不错，还是可以一用的
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.content.Context;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.widget.EditText;
import android.widget.Toast;
/**
* you can use it like:
* mEditText.setToastString(getResources().getString(R.string.robot_name_error))
* .setWordCountLimit(5)
* .setFormatPattern(SPECIAL_CHARACTERS);
*
* if you want a toast , you must call setToastString(ToastString)
* if you want a custom FormatPattern, you should call setFormatPattern(String str)
* if you want add your TextWatcher, call removeDefaultTextWatcher() first
* if you want get string igno space, call getString()
*/
public class EditTextFormated extends EditText {
private String mToastString;
private int mMaxLen = 20;
private static final String DEFAULT_SPECIAL_CHARACTERS =
"[\"\"''`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~！@#￥%……&*"
+ "（）---—-—+|{}【】‘；：”“’。，、？]";
private Pattern mPattern;
public EditTextFormated(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initFormat();
}
public EditTextFormated(Context context, AttributeSet attrs) {
super(context, attrs);
initFormat();
}
public EditTextFormated(Context context) {
super(context);
initFormat();
}
private void initFormat() {
mPattern = Pattern.compile(DEFAULT_SPECIAL_CHARACTERS);
addTextChangedListener(mDefaultTextWatcher);
}
private TextWatcher mDefaultTextWatcher = new TextWatcher() {
private int editStart;
private int editEnd;
private String mBeforeString;
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
mBeforeString = s.toString();
}
public void afterTextChanged(Editable s) {
editStart = getSelectionStart();
editEnd = getSelectionEnd();
removeTextChangedListener(this);
if (!TextUtils.isEmpty(getString())) {
while (calculateLength(s.toString()) > mMaxLen) {
s.delete(editStart - 1, editEnd);
editStart--;
editEnd--;
}
}
Matcher matcher = mPattern.matcher(s);
if (matcher.find()) {
if (mToastString != null) {
Toast.makeText(getContext(), mToastString,
Toast.LENGTH_SHORT).show();
}
setText(mBeforeString);
setSelection(mBeforeString.length());
addTextChangedListener(this);
return;
}
setText(s);
setSelection(editStart);
addTextChangedListener(this);
}
private int calculateLength(String etstring) {
char[] ch = etstring.toCharArray();
int varlength = 0;
for (int i = 0; i < ch.length; i++) {
if ((ch[i] >= 0x2E80 && ch[i] <= 0xFE4F)
|| (ch[i] >= 0xA13F && ch[i] <= 0xAA40)
|| ch[i] >= 0x80) {
varlength = varlength + 2;
} else {
varlength++;
}
}
return varlength;
}
};
/**
* for Personalise TextWatcher you should call this method first
*/
public EditTextFormated removeDefaultTextWatcher() {
removeTextChangedListener(mDefaultTextWatcher);
return this;
}
/**
* get text and ignore spaces
* @return String
*/
public String getString() {
return getText().toString().trim();
}
/**
* set the Special characters Toast string
* @param hint
*/
public EditTextFormated setToastString(String hint) {
mToastString = hint;
return this;
}
public EditTextFormated setWordCountLimit(int len) {
mMaxLen = len;
return this;
}
public EditTextFormated setFormatPattern(String str) {
mPattern = Pattern.compile(str);
return this;
}
}
谢谢大家阅读，如有帮助，来个喜欢或者关注吧！
本文作者：Anderson/Jerey_Jobs
地址：[Anderson大码渣][1]
github地址：[Jerey_Jobs][2]
[1]: http://www.jianshu.com/users/016a5ba708a0/latest_articles
[2]: https://github.com/Jerey-Jobs