public String toAttachmentsString() {
ArrayList<CharSequence> attachments = new ArrayList<CharSequence>();
for (VKApiAttachment attach : this) {
attachments.add(attach.toAttachmentString());
}
return VKStringJoiner.join(attachments, ",");
}
private String generateSig(VKAccessToken token) {
// Read description here https://vk.com/dev/api_nohttps
// At first, we need key-value pairs in order of request
String queryString = VKStringJoiner.joinParams(mPreparedParameters);
// Then we generate "request string" /method/{METHOD_NAME}?{GET_PARAMS}{POST_PARAMS}
queryString = String.format(Locale.US, "/method/%s?%s", methodName, queryString);
return VKUtil.md5(queryString + token.secret);
}