Develop Reference

How can I extract a specific part of a JSON file?

This is my JSON file :
{
"coord":{
"lon":139,
"lat":35
},
"weather":[
{
"id":803,
"main":"Clouds",
"description":"broken clouds",
"icon":"https://cdn.glitch.com/6e8889e5-7a72-48f0-a061-863548450de5%2F04n.png?1499366020983"
}
],
"base":"stations",
"main":{
"temp":7,
"pressure":1025,
"humidity":75,
"temp_min":7,
"temp_max":7
},
"visibility":10000,
"wind":{
"speed":5.1,
"deg":100
},
"clouds":{
"all":75
},
"dt":1549794600,
"sys":{
"type":1,
"id":8024,
"message":0.0034,
"country":"JP",
"sunrise":1549748122,
"sunset":1549786891
},
"id":1851632,
"name":"Shuzenji",
"cod":200
}
I have tried to extract the weather array but it doesn't work.
JSONArray mArray;
try {
mArray = new JSONArray(result);
for (int i = 0; i < mArray.length(); i++) {
JSONObject mJsonObject = mArray.getJSONObject(i);
txtJson.append(mJsonObject.getString("weather"));
}
} catch (JSONException e) {
e.printStackTrace();
//txtJson.setText(result);
}
txtJson.setText(result);
}

I don't know what you expect that code to do, but if you want to extract the weather array, this is how you do it.
JSONObject json = new JSONObject(result);
JSONArray weather = json.getJSONArray("weather");
Then you can get individual entries in the array
JSONObject entry = weather.getJSONObject(0);
int id = entry.getInt("id");
String main = entry.getString("main");
or if you just want to turn the array back to a string
String s = weather.toString();

how to sort two json array with time

I want to sort two json arrays stream and stream1 with respect to time together.
The record in each array with the latest time will come first.Time is formatted like value of min ago ,days ago
This is the code I have so far:
parseJsonFeed(JSONObject response) {
try {
String stream = pref.getStream();
JSONArray feedArray = response.getJSONArray(stream);
for (int i = 0; i < feedArray.length(); i++) {
JSONObject feedObj = (JSONObject) feedArray.get(i);
FeedItem item = new FeedItem();
item.setId(feedObj.getInt("id"));
item.setName(feedObj.getString("title"));
// Image might be null sometimes
String image = feedObj.isNull("image") ? null : feedObj
.getString("image");
item.setImge(image);
item.setStatus(feedObj.getString("status"));
item.setProfilePic(feedObj.getString("profilepic"));
item.setTimeStamp(feedObj.getString("created_at"));
// url might be null sometimes
String feedUrl = feedObj.isNull("url") ? null : feedObj
.getString("url");
item.setUrl(feedUrl);
feedItems.add(item);
}
// notify data changes to list adapater
listAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
String stream2 = pref.getStream2();
if (!stream2.contentEquals("none")) {
try {
JSONArray feedArray = response.getJSONArray(stream2);
for (int i = 0; i < feedArray.length(); i++) {
JSONObject feedObj = (JSONObject) feedArray.get(i);
FeedItem item = new FeedItem();
item.setId(feedObj.getInt("id"));
item.setName(feedObj.getString("title"));
// Image might be null sometimes
String image = feedObj.isNull("image") ? null : feedObj
.getString("image");
item.setImge(image);
item.setStatus(feedObj.getString("status"));
item.setProfilePic(feedObj.getString("profilepic"));
item.setTimeStamp(feedObj.getString("created_at"));
// url might be null sometimes
String feedUrl = feedObj.isNull("url") ? null : feedObj
.getString("url");
item.setUrl(feedUrl);
feedItems.add(item);
}
// notify data changes to list adapater
listAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
I need to sort the arrays together to show the most recent item in each array first, then the next most recent, and so on.

Make the FeedItem class implement Comparable or Comparator (refer this). Then call :
Collections.sort(feedItem);
before calling notifyDataSetChanged()

Error in reading Json response

I"m trying to to read a json response from my json feed but the log cat shows me this error.. don't know what to do... please help..
/Error - >﹕ org.json.JSONException: Value of type java.lang.String cannot be converted to JSONObject
My json response from link is here...
{
"feed":[
{
"id":65,
"name":"Hissam",
"image":"http://deejay.org/feed/ironman.jpg",
"status":"Hello thi is hissam",
"profilePic":"http://deejay.org/feed/profilepic.jpg",
"timeStamp":"1403375851930",
"url":"http://google.com"
},
{
"id":65,
"name":"Hissam",
"image":"http://deejay.org/feed/cosmos.jpg",
"status":"Hello thi is hissam",
"profilePic":"http://deejay.org/feed/profilepic.jpg",
"timeStamp":"1403375851930",
"url":"http://google.com"
}
]
}
Here is my JSON code
private void parseJsonFeed(JSONObject response) {
try {
JSONArray feedArray = response.getJSONArray("feed");
for (int i = 0; i < feedArray.length(); i++) {
JSONObject feedObj = (JSONObject) feedArray.get(i);
FeedItem item = new FeedItem();
item.setId(feedObj.getInt("id"));
item.setName(feedObj.getString("name"));
// Image might be null sometimes
String image = feedObj.isNull("image") ? null : feedObj
.getString("image");
item.setImge(image);
item.setStatus(feedObj.getString("status"));
item.setProfilePic(feedObj.getString("profilePic"));
item.setTimeStamp(feedObj.getString("timeStamp"));
// url might be null sometimes
String feedUrl = feedObj.isNull("url") ? null : feedObj
.getString("url");
item.setUrl(feedUrl);
feedItems.add(item);
}

Solved the issue by adding
header('Content-type:application/json');
to my PHP script. Didn't know header were that important up till now.

How to parse JSON structured-JSON Array Object in Java

i'm trying to parse this JSON code
{
"resultCode":"350",
"message":"OK",
"result":1,
"data":
{
"totalCount":"2",
"videos":[
{
"videoId":"73bfedf534",
"VideoUrl":"www.videourlexample.com",
"title":"vbsample1",
"description":""
},
{
"videoId":"73bfedf534",
"VideoUrl":"www.videourlexample.com",
"title":"vbsample2",
"description":""
}
]
}
}
I was able to parse only this.
"resultCode":"350",
"message":"OK",
"result":1,
this is the java code
JSONObject jsonObject = (JSONObject)
//return the JSON code above.
jsonParser.parse(getHTML("...httpRequest..."));
// get a String from the JSON object
String resultCode = (String) jsonObject.get("resultCode");
System.out.println("[RESULTCODE] The message is: " + resultCode);
// get a String from the JSON object
String message = (String) jsonObject.get("message");
System.out.println("[MESSAGE] The message is: " + message);
// get a number from the JSON object
long result = (long) jsonObject.get("result");
System.out.println("[RESULT] The resultCode is: " + result);
I can't parse the "data". Someone can help me?
I would like to take each value from the json array separately... like resultCode, message and result.
Thank you.

JSONObject mainObj= new JSONObject(yourJSON);
String resultCode= mainObj.get("resultCode");
String message= mainObj.get("message");
String result= mainObj.get("result");
JSONObject dataObj = mainObj.get("data");
JSONArray jsonArray = (JSONArray) dataObj.get("videos");
for (int i = 0; i <jsonArray.length(); i++) {
JSONObject obj= jsonArray.get(i);
String videoId=obj.get("videoId");
String videoUrl=obj.get("VideoUrl");
String title=obj.get("title");
String description=obj.get("description");
System.out.println("videoId="+videoId +"videoUrl="+videoUrl+"title=title"+"description="+description);
}
System.out.println("resultCode"+resultCode+"message"+message+"result"+result);

You can try using this:-
JSONObject dataObj = (JSONObject)dataObj .get("data");
JSONArray jsonArray = (JSONArray) dataObj.get("videos");
for (int i = 0; i <jsonArray.length(); i++) {
System.out.println(((JSONObject)jsonArray.get(i)).get("videoUrl"));
}
Currently I have just printes videoUrl, you can similarly get other attributes for videos.

for data use:
int totalCount = (int) ((Map) jsonObject.get("data")).get("totalCount");
JSONArray videos = (JSONArray) jsonObject.get("data")).get("videos");
and then parse videos JSONArray.

JSON parse Android - object in object

How to parse this json? I want get data from title, field_place and brothers fields.
{
"events": [
{
"event": {
"title": "BITUMIX Martyna Jastrz\u0119bska",
"field_place": "Nowe Miejsce Al Jerozolimskie 51 lok.2",
"field_zdjecie": "http:\/\/wybierzkulture.waw.pl\/sites\/default\/files\/styles\/post\/public\/martyna_jastrzebska_bitumix_2.jpg?itok=nd2O5U5z"
}
},
{
"event": {
"title": "Wiecz\u00f3r Komedii Improwizowanej - D\u017cem Impro!",
"field_place": "",
"field_zdjecie": "http:\/\/wybierzkulture.waw.pl\/sites\/default\/files\/styles\/post\/public\/dzem_17_maja.jpg?itok=bfgDYxKq"
}
},
...
I tried:
JSONObject itemm = jArray.getJSONObject(i);
JSONObject oneObject = itemm.getJSONObject("event");
String title = oneObject.getString("title");
String field_place = oneObject.getString("field_place");
... but it doesn't work.

In a JSON string , there are two symbols that guide you through parsing :
{ - indicates a JSONObject
[ - indicates a JSONArray
When parsing a json string, you should go through this items iteratively. To understand how many JsonObjects and JsonArrays you have in your string , and from which you should start parsing, use a json-visualizer tool like this website. :
Example : As you see, the root object is a JSONObject which consists of an JSONArray with three jsonOnjects. To parse such a structure you can use :
JSONObject jsonobj = new JSONObject(jsonstring);
String result = jsonObject.getString("success");
String error_number = jsonObject.getString("error_number");
String error_message = jsonObject.getString("error_message");
JSON Array jsonarray = jsonobj.getJSONArray();
String[] names = new String[jsonArray.length()];
String[] formattedNames = new String[jsonArray.length()];
for(int i=0;i<jsonArray.length();i++)
{
JSONObject jsonObject = jsonArray.getJSONObject(i);
names [i] = jsonObject.getString("name");
formattedNames [i] = jsonObject.getString("formattedName");
}

try this
JSONArray element = jsonobj.getJSONArray("events");
for(int i=0;i < element.length();i++){
JSONObject e = element.getJSONObject(i);
Log.d("TESTTT22",e.getJSONObject("event").getString("title"));
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}