Android Utililty Methods Array to String Convert

String result = "";
if (arrays != null && arrays.length > 0) {
    for (int value : arrays) {
        result += value + " ";
    result = result.substring(0, result.length() - 1);
return result;
...

if (array == null || array.length == 0)
    return "";
StringBuilder string = new StringBuilder();
for (String item : array) {
    string.append(item).append(',');
return string.toString();

StringBuilder str = new StringBuilder("");
if (ids != null && ids.length > 0) {
    for (long id : ids) {
        str.append(id).append(",");
    str.setCharAt(str.length() - 1, ' ');
return str.toString();
...