M.V. M.V. - 1 month ago 9
JSON Question

Retrieving JSON from URL on Android

My phone APP downloads content perfectly in a text mode. Below is a code to do that. I call Communicator class and exectueHttpGet:

URL_Data = new Communicator().executeHttpGet("Some URL");


public class Communicator {
public String executeHttpGet(String URL) throws Exception
{
BufferedReader in = null;
try
{
HttpClient client = new DefaultHttpClient();
client.getParams().setParameter(CoreProtocolPNames.USER_AGENT, "android");
HttpGet request = new HttpGet();
request.setHeader("Content-Type", "text/plain; charset=utf-8");
request.setURI(new URI(URL));
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

StringBuffer sb = new StringBuffer("");
String line = "";

String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null)
{
sb.append(line + NL);
}
in.close();
String page = sb.toString();
//System.out.println(page);
return page;
}
finally
{
if (in != null)
{
try
{
in.close();
}
catch (IOException e)
{
Log.d("BBB", e.toString());
}
}
}
}
}


What I recive is this (source code of URL):

[{"id_country":"3","country":"AAA"},{"id_country":"8","country":"BBB"},
{"id_country":"66","country":"CCC"},{"id_country":"14","country":"DDD"},
{"id_country":"16","country":"EEE"},{"id_country":"19","country":"FFF"},
{"id_country":"24","country":"GGG"},{"id_country":"33","country":"HHH"},
{"id_country":"39","country":"III"},{"id_country":"44","country":"JJJ"},
{"id_country":"45","country":"KKK"},{"id_country":"51","country":"LLL"},
{"id_country":"54","country":"MMM"},{"id_country":"55","country":"NNN"},
{"id_country":"57","country":"OOO"},{"id_country":"58","country":"PPP"},
{"id_country":"63","country":"RRR"},{"id_country":"65","country":"SSS"}]


This response is a String. On server it is outputted (with PHP) as JSON object and now in my Android PHP I want to transfrom this string to JSON. Is this possible?

Answer

What you receive is a series of characters from the InputStream that you append to a StringBuffer and convert to String at the end - so the result of String is ok :)

What you want is to post-process this String via org.json.* classes like

String page = new Communicator().executeHttpGet("Some URL");
JSONObject jsonObject = new JSONObject(page);

and then work on jsonObject. As the data you receive is an array, you can actually say

String page = new Communicator().executeHttpGet("Some URL");
JSONArray jsonArray = new JSONArray(page);
for (int i = 0 ; i < jsonArray.length(); i++ ) {
  JSONObject entry = jsonArray.get(i);
  // now get the data from each entry
}
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