Edittext限制輸入漢字50英文100
【android:maxLength="50" 限制漢字50個】
AddLengthFilter.lengthFilter(this, et_explain, 100, "超出範圍");
/**
* 長度監聽過濾*
* @version v1.0
* EditText輸入中文和英文長度監聽,中文按兩個字元,英文按一個字元,監聽輸入的長度,在你需要呼叫的地方新增:
* AddLengthFilter.lengthFilter(this, nameEt, 32, "提示資訊"));
* @author
*/
public class AddLengthFilter implements InputFilter {
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
return null;
}
// 長度監聽
public static void lengthFilter(final Context context,
final EditText editText, final int max_length, final String err_msg) {
InputFilter[] filters = new InputFilter[1];
filters[0] = new InputFilter.LengthFilter(max_length) {
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
// 獲取字元個數(一箇中文算2個字元)
int destLen = getCharacterNum(dest.toString());
int sourceLen = getCharacterNum(source.toString());
if (destLen + sourceLen > max_length) {
Toast.makeText(context, err_msg, Toast.LENGTH_SHORT).show();
return "";
}
return source;
}
};
editText.setFilters(filters);
}
/**
* @description 獲取一段字串的字元個數(包含中英文,一箇中文算2個字元)
* @param content
* @return
*/
public static int getCharacterNum(final String content) {
if (null == content || "".equals(content)) {
return 0;
} else {
return (content.length() + getChineseNum(content));
}
}
/**
* @description 返回字串裡中文字或者全形字元的個數
* @param s
* @return
*/
public static int getChineseNum(String s) {
int num = 0;
char[] myChar = s.toCharArray();
for (int i = 0; i < myChar.length; i++) {
if ((char) (byte) myChar[i] != myChar[i]) {
num++;
}
}
return num;
}
}