需求:EditText限制 輸入20個字母。10個漢字
afterTextChanged方法。
private final int MAX_CHAR_NUM = 20;
mSearchEditText.addTextChangedListener(new SimpleTextWatcher() {
@Override
public void afterTextChanged(Editable s) {
int charSequenceCount = countChineseChar(s);
if (s.length() + charSequenceCount > MAX_CHAR_NUM) {
mSearchEditText.setText(s.subSequence(0, s.length() - 1));
return;
}
});
//計算中文字元
/**
* 計算中文字元
*
* @param sequence
* @return
*/
private int countChineseChar(CharSequence sequence) {
if (TextUtils.isEmpty(sequence)) {
return 0;
}
int charNum = 0;
for (int i = 0; i < sequence.length(); i++) {
char word = sequence.charAt(i);
if (StringUtils.isChineseChar(word)) {//中文
charNum++;
}
}
return charNum;
}
/**
* 判斷是否是中文* @param c
* @return
*/
public static boolean isChineseChar(char c) {
Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION) {
return true;
}
return false;
}