Android JSON retrieve objects from url

Question

I have script return JSON like this

{"a":"something","b":"something"}
{"a":"something1","b":"something1"}

It's NDJSON response! Now i am trying to retrieve it from android but i get null on jsonResult. This is the code I use after fetching:

JSONObject jsonResponse = new JSONObject(jsonResult);
JSONArray jsonMainNode = new JSONArray(jsonResponse);

I get null pointer exception on first line because jsonResult is null. What is wrong?

This is how i fetch:

HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);

HttpResponse response = httpclient.execute(httpget);
jsonResult = inputStreamToString(
response.getEntity().getContent()).toString();

Can you post your `jsonResult` ? You have this error because `jsonResult` is null — ThomasThiebaud, Oct 14 '15 at 13:20
Maybe posting this method will help us understand a bit more `inputStreamToString` — kabuto178, Oct 14 '15 at 13:27
org.apache.http.HttpResponse is deprecated. You should not use this code for a new project — AlbAtNf, Oct 14 '15 at 13:28

score 0 · Answer 1 · answered Oct 14 '15 at 13:25

Check if result is null before using it

HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(params[0]);

HttpResponse response = httpclient.execute(httpget);

jsonResult = inputStreamToString(response.getEntity().getContent()).toString();

if(result != null) {
    JSONObject jsonResponse = new JSONObject(jsonResult);
    JSONArray jsonMainNode = new JSONArray(jsonResponse);
} else {
    //Do something
}

Now you have to check your request or the inputStreamToString method to know why you have a null response.

score 0 · Answer 2 · answered Oct 14 '15 at 13:29

0

Try This:

int status = response.getStatusLine().getStatusCode();
 HttpEntity httpEntity = response.getEntity();
            is = httpEntity.getContent();

BufferedReader reader = new BufferedReader(new InputStreamReader(is, HTTP.UTF_8), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null)
            {
                sb.append(line + "\n");
            }
            is.close();
            String json = sb.toString();
JSONObject jObj = new JSONObject(json);

answered Oct 14 '15 at 13:29

Mayuri Joshi

164
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2
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what is "is" ? how do I define it? – vitas_kek Oct 14 '15 at 13:41
changed HTTP.UTF_8 to "UTF_8" .. but still json is null – vitas_kek Oct 14 '15 at 13:50
Does you request work ? Does it return someting ? You can test it using [curl](https://github.com/bagder/curl) – ThomasThiebaud Oct 14 '15 at 13:56
Yes with curl it is returning JSON as i mentioned in the first post. But from Android i can't get it. It's the newline delimited JSON, as i described. I feel your code is very close to solve this, but still not working.. – vitas_kek Oct 14 '15 at 14:48

Android JSON retrieve objects from url

2 Answers2