How to past an array of objects to server from android?

Question

I am trying to send an array with a bunch of objects back to android?

I tried String Builder like so:

StringBuilder sb = new StringBuilder();
        sb.append("[");
        for(int i = 0; i <usersChanged.size(); i++) {
            DatabaseUser userChange = usersChanged.get(i);

                if(userChange.getIsFollowingType() == 0) {
                    String userIdStr = "{userId:" +  userChange.getUserId() + ",";
                    String followingStr = "following:" +  String.valueOf(userChange.getIsFollowingType())+ "}]";
                    sb.append(userIdStr).append(followingStr);

but I am doing something wrong here. On my server side I am using node.js and would parse the array if I send over a string no problem, but this is not sending a string version of the array? What do I need to change on my string builder? Or is there a more efficient way to send over the list of usersChanged - (which is List)

I am using retrofit if there is a way to do it easy with that.

Which side you are facing problem?? server Side or android side?? — akhil Rao
– akhil Rao, Commented May 11, 2016 at 2:35
android side, I am looking for a solution to send over an array — Lion789
– Lion789, Commented May 11, 2016 at 2:37
efficiency, no need for reinventing the wheel and lack of bugs — pskink
– pskink, Commented May 11, 2016 at 6:13

Jonathan Darryl · Accepted Answer · 2016-05-11 02:43:14Z

1

Your code will send things like

[{userId: someuserid, following: someparameter}]

You need to have the double quote (" ") sent over as well.

for(int i = 0; i <usersChanged.size(); i++) {
        DatabaseUser userChange = usersChanged.get(i);

            if(userChange.getIsFollowingType() == 0) {
                String userIdStr = "{\"userId\":\"" +  userChange.getUserId() + "\",";
                String followingStr = "\"following\":\"" +  String.valueOf(userChange.getIsFollowingType())+ "\"}]";
                sb.append(userIdStr).append(followingStr);

You should also probably move the "]" to after the loop.

EDIT:

Forgot to mention this, but you can definitely use JSONArray and JSONObject to make your life easier.

JSONArray jsonArray = new JSONArray();
for(...){
    JSONObject jsonObject = new JSONObject();
    jsonObject.put("userId", userChange.getUserId());
    jsonObject.put("following", String.valueOf(userChange.getIsFollowingType()));
    jsonArray.put(jsonObject);

}

Then send over the jsonArray.

edited May 11, 2016 at 2:43

answered May 11, 2016 at 2:36

Jonathan Darryl

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7 Comments

Lion789 Over a year ago

Thanks will try that out now, yeah I have an if else statement just copied it out the code is a lot heavier but that is what I forgot.

Jonathan Darryl Over a year ago

@Lion789 the start with [ is fine, [{"userId":"asdf", "following":"asdf"}] is a valid JSON.

Jonathan Darryl Over a year ago

@Lion789 have updated the answer with other alternative.

Lion789 Over a year ago

I dont think i can send back a jsonArray with retrofit unfortunately.

Jonathan Darryl Over a year ago

You can try converting that to string first. i.e. String s = jsonArray.toString();

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