if (postListObj != null && postListObj instanceof JSONArray) {
JSONArray posts = (JSONArray) postListObj;
int postSize = posts.length();
for (int a = 0; a < postSize; a++) {
JSONObject jObj = posts.getJSONObject(a);
Post p = new Post();
p.postId = jObj.getString("post_id");
p.viewerId = jObj.getLong("viewer_id");
p.sourceId = jObj.getLong("source_id");
p.type = jObj.getInt("type");
// jObj.getLong("app_id");