android 字符长度限制，中文2个字符 ，英文1个字符

public static String handleText(String str, int maxLen) {
    if (TextUtils.isEmpty(str)) {
        return str;
    }
    int count = 0;
    int endIndex=0;
    for (int i = 0; i < str.length(); i++) {
        char item = str.charAt(i);
        if (item < 128) {
            count = count + 1;
        } else {
            count = count + 2;
        }
        if(maxLen==count || (item>=128 && maxLen+1==count)){
            endIndex=i;
        }
    }
    if (count <= maxLen) {
        return str;
    } else {

        return str.substring(0, endIndex) + "...";
    }

}