My problem is simple, I'd like to add a JSONObject to a JSONArray that I store in a MongoDB database. I can easily add all types of data like Strings, Ints etc but not JSONObjects.
I do this in my code :
public void done(ParseObject lan, ParseException e) {
if(e==null){
JSONObject object = new JSONObject();
try{
object.put("PlayerName","John");
object.put("ID",514145);
lan.add("Participants",object); //nothing gets inserted
lan.add("Participants",15); //works fine
lan.add("Participants",JSONObject.null); //works fine too
}catch (JSONException error){
}
lan.increment("Number");
lan.saveInBackground();
}else{
Log.i("Parse Error","error");
}
}
But nothing appears in my db and there's no error thrown.
Do you guys have any clue on how to do that ?
Try using object.toString() instead of object.
lan.add("Participants", object.toString());
JSON:
{"Participants":["{\"PlayerName\":\"John\",\"ID\":514145}"]}
To parse this JSON try this:
JSONObject jsonObj = new JSONObject(YOUR_JSON_STRING);
// Participants
JSONArray participantsJsonArray = jsonObj.getJSONArray("Participants");
// Participant
JSONObject participanJsonObject = participantsJsonArray.getJSONObject(0);
// PlayerName
String playerName = participanJsonObject.getString("PlayerName");
// ID
String id = participanJsonObject.getInt("ID");
Hope this will help~
Convert that Json Object into String and store it in string format
lan.add("Participants",object.toString());
And when you want to use that you can easily convert it into Json Object again like this
JSONObject jObj=new JSONObject("Your Json String");
Related
I have this string:
[{"row 0":[{},{},{},{},{},{},{},{}]},{"row 1":[{},{},{},{},{},{},{},{}]},{"row 2":[{},{},{},{},{},{},{},{}]},{"row 3":[{},{},{},{},{},{},{},{}]},{"row 4":[{"column 0":"WhitePawn"},{},{},{},{},{},{},{}]},{"row 5":[{},{},{},{},{},{},{},{}]},{"row 6":[{},{},{},{},{},{},{},{}]},{"row 7":[{},{},{},{},{},{},{},{}]}]
^ it's currently a String, let's call it string.
I'm trying to convert it into JSON like so:
new JSONObject(string);
but it isn't working. How to do this in Java?
Code looks like so:
private void parseMessageRedrawBoard(String message) {
Log.d("0000: ", message);
String trimmed = message.substring(message.indexOf("["));
Log.d("1111: ", trimmed);
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(trimmed);
Log.d("maybe worked...", "~");
} catch (Exception e) {
Log.d("dammit: ", e.getMessage());
}
}
You are trimming the string and turning it into an invalid JSON.
Your JSON starts with a "[" that indicates it is an array. If it starts with "{" you can assume that is an object.
So, as your JSON is an array, you can parse this exact content you mentioned with:
JSONArray jsonArray = new JSONArray(string);
And access the elements like in a List:
jsonArray.get(0);
Can any one tell me, how to sum two JSON objects values? Say, for an example:
First JSON
{
"json_obj":20,
}
Second JSON
{
"json_obj":40,
}
Here what I wanted is, I'm trying to create one JSON as same as like the above one, but i need to sum up two values of the JSON object "json_obj" and finally need to show it as like the below JSON
Resultant JSON
{
"json_obj":60
}
How to achieve this?
Try this,
JSONObject jsonObject1 = new JSONObject(First_JSON);
JSONObject jsonObject2 = new JSONObject(Socond_JSON);
JSONObject jsonObject3 = new JSONObject();
jsonObject3.put("json_obj", jsonObject1.getInt("json_obj")+jsonObject2.getInt("json_obj"));
Try this:
public String getAddedValues(String firstJson, String secondJson, String key){
JSONObject first = new JSONObject(firstJson);
JSONObject second = new JSONObject(secondJson);
int value = first.getInt(key) + second.getInt(key);
JSONObject output = new JSONObject();
output.put(key, value);
return output.toString();
}
Invoke it passing your json Strings and the "json_obj" String as key.
The idea is that you forst need to convert the json string into a Java object. Then you do your calculations, and finally you create another JSONObject with the result. JSONObject.toString() returns the common String representation you would expect as output :-)
You can try something like that:
public class CalcObj {
public int json_obj;
}
public String sumTwoJsons(String json1, String json2) {
Gson _gson = new Gson();
CalcObj obj1 = _gson.fromJson(json1, CalcObj.class);
CalcObj obj2 = _gson.fromJson(json2, CalcObj.class);
CalcObj objSum = new CalcObj();
objSum.json_obj = obj1.json_obj + obj2.json_obj;
return _gson.toJson(objSum );
}
i m trying to get values from JSONArray inside array, i m able to retrieve whole JSON values into JSONArray successfully but not able to retrieve values inside JSONArray. When i convert JSONArray to JSONObject to get values stored inside JSONArray. It gives error: org.json.JSONException: No value for "banner"
Here is JSON code, i verified JSON code with jsonlint.com and it showed JSON is Validate,
[
{"code":"banner","moduletitle":0,
"banner":
[
{"image":"http://imageurl"},
{"image":"http://imageurl"},
{"image":"http://imageurl"}
]
}
]
I m trying to get this from 3 hour but no luck. i m new in JSON and do not know how JSON Actually work, and also read abut GSON Library to get JSON values. here is My Java code.
JSONArray jsonObj = null;
String image_url = "";
String banner_code ="";
try {
jsonObj =new JSONArray(lib_function.getJSONUrl( jsontags.Top_Banner_JOSN_URLs));
Log.d("value retrun :","" +jsonObj);
//---vlaue is coming and print in Log ----//
} catch (JSONException e) {
Log.v("Error in Parser :", " " + e);
Log.d("no value retrun :", "failed to convert");
}
try{
JSONObject jo = new JSONObject();
JSONArray ja = new JSONArray();
// populate the array
jo.put("arrayName", jsonObj);
JSONArray subArray = jo.getJSONArray("banner");
image_url= subArray.getString(Integer.parseInt("image"));
Log.d("banner code",""+subArray);
}catch(Exception e)
{
Log.d("not working",""+e);
}
I folllow this question but luck:
How to parse JSON Array inside another JSON Array in Android
If anyone suggest, what i m doing wrong will be appreciate. or let me know, where i can get more information about json
UPDATE thanks too all to give their precious time for answering my stupid question. All answers are correct , but i can accept only one answer. A Big thanks to all
Here:
JSONObject jo = new JSONObject();
JSONArray ja = new JSONArray();
// populate the array
jo.put("arrayName", jsonObj);
Because parsing jsonObj JSONArray so no need to create new JSONArray and JSONObject to extract it from jsonObj. remove all above three lines.
banner JSONArray is inside JSONObject which is contained by jsonObj JSONArray, get it as:
JSONObject jsonObject=jsonObj.optJSONObject(0);
JSONArray subArray = jsonObject.getJSONArray("banner");
// get code key from `jsonObject`
String strCode=jsonObject.optString("code");
// get all images urls from `subArray`
for(int index=0;index<subArray.length();index++){
JSONObject imgJSONObject=subArray.optJSONObject(index);
// get image urls
String strImgURL=imgJSONObject.optString("image");
}
Also, if jsonObj JSONArray contains multiple JSONObject's then use for-loop to iterate it.
I am assuming you have the rest of the values accessible to you, so posting just this snippet.
code=jsonObject.getString("code");
moduletitle=jsonObject.getString("moduletitle");
banner=jsonObject.getJSONArray("banner");
jsonObj =new JSONArray(lib_function.getJSONUrl( jsontags.Top_Banner_JOSN_URLs);
From above line you will get JSONArray. So now loop it and get you banner JSONArray.Again loop bannerArray and you will get image Urls
If You want value of "image" which is in json arrray than
String response = "your response";
try{
JsonArray jAry = new JsonArray(response);
JsonObject jObj = jAry.getJsonObject(0);
JsonArray jsonBanner = jObj.getJsonArray("banner");
JsonObject temp;
for(int i=0;i<jsonBanner.length;i++){
temp = jsonBanner.getJsonObject(i);
String image = temp.optString("image");
}
}
What I want to do is at a particular index position change/replace a value inside a json array.After going through the documentation at http://www.json.org/javadoc/org/json/JSONArray.html I found out that jsonArray does not have a getIndex() method.In this situation how do I update my json array at a given index position.
This is the method that creates a json array in my android code.
private void createJsonArray() {
billType = (invEstSwitch.isChecked() ? textViewEstimate : textViewInvoice)
.getText().toString();
String invNumber = textViewInvNo.getText().toString();
String bcode = barCode.getText().toString();
String description = itemDesc.getText().toString();
String wt = weightLine.getText().toString();
String rateAmt = rateAmount.getText().toString();
String making = makingAmount.getText().toString();
String netr = netRate.getText().toString();
String iTotal = itemtotal.getText().toString();
String vatAmt = textViewVat.getText().toString();
String sumAmt = textViewSum.getText().toString();
String crtDate = textViewCurrentDate.getText().toString();
try {
jsonObject.put("custInfo", custSelected.toString());
jsonObject.put("invoiceNo", invNumber);
jsonObject.put("barcode", bcode);
jsonObject.put("description", description);
jsonObject.put("weight", wt);
jsonObject.put("rate", rateAmt);
jsonObject.put("makingAmt", making);
jsonObject.put("net_rate", netr);
jsonObject.put("itemTotal", iTotal);
jsonObject.put("vat", vatAmt);
jsonObject.put("sum_total", sumAmt);
jsonObject.put("bill_type", billType);
jsonObject.put("date", crtDate);
} catch (JSONException e) {
e.printStackTrace();
}
try {
itemSelectedJson.put(index, jsonObject);
index++;
} catch (JSONException e) {
e.printStackTrace();
}
}
And this is the code that I use to update my json array which contains a json object.
try {
itemSelectedJson.getJSONObject(i).put("net_rate",netChange);
Log.d("NETRATE_TW",itemSelectedJson.toString());
} catch (JSONException e) {
e.printStackTrace();
}
Now the problem with this code is it updates the jsonArray everytime a new item is added to the code.So the first object values are the same as the last object.
Also note that I am using this code inside a text watcher.So the afterTextchanged() method looks like this.
#Override
public void afterTextChanged(Editable s) {
String netChange = netRate.getText().toString();
final int row_id = (int) newRow.getTag();
if ((row_id<0) || (row_id> itemSelectedJson.length())){
return;
}
try {
itemSelectedJson.getJSONObject(row_id-1).put("net_rate",netChange);
Log.d("NETRATE_TW",itemSelectedJson.toString());
} catch (JSONException e) {
e.printStackTrace();
}
}
};
This is the snapshot of what my database looks like.
A jSONObject(which is a collection of name,value pairs) can be converted into a JSONArray which is an ordered array of the "values" in the JSONObject.
This can be done using the .toJSONArray() method.
When you need to replace/update the JSONArray, you may use the method
.put(int index, java.util.Map value)
Unlike how you are doing at present, i.e getting the object and setting a new key and value.
http://www.json.org/javadoc/org/json/JSONArray.html#put(int, java.util.Map)
As I understood, your problem is in creating multiple JSONObjects in your JSONArray with the same values, and that's because you can't get the index of a created JSONObject inside your JSONArray, and to overcome this problem, you can easily create a compound JSONObject that contains your JSONObjects instead of a JSONArray contains JSONObjects, and the object name will be anything unique in your JSONObject data, and when you make any changes or add any item it will either be added as a new object if it doesn't exist or it will overwrite the existing object if it added before, for example let's suppose that barcode value is unique in your data, so the code will be like the following:
// declaring itemSelectedJson as JSONObject
JSONObject itemSelectedJson = new JSONObject();
.
.
.
// when wanting to add a new item
itemSelectedJson.put(jsonObject.getString("barcode"), jsonObject);
and to retrieve the data you simple iterate through this JSONObject:
Iterator<?> keys = itemSelectedJson.keys();
JSONObject single_item;
while(keys.hasNext()) {
String key = (String)keys.next();
single_item = itemSelectedJson.getJSONObject(key);
// do what do you want here
}
Hello i call a service if it contains multiple objects it make list but when it contain only one object it return a single object not a list [] are missing , actually i want to convert them into java class using gson but in case of single exception it throw exception but when it contain list it work fine i actually need to convert my single gSON string to array ,please help me ..here is the string
{
"response":{
"projects":{
"project":{
"ixWorkflow":1,
"sEmail":"j.a#loxvo.com",
"sPhone":"",
"ixProject":2,
"ixPersonOwner":2,
"fDeleted":false,
"sProject":"Project Default",
"fInbox":true,
"sPersonOwner":"junaid"
}
}
}
}
i want it to be like same as
{
"response":{
"projects":{
"project":[
{
"ixWorkflow":1,
"sEmail":"j.a#loxvo.com",
"sPhone":"",
"ixProject":6,
"ixPersonOwner":2,
"fDeleted":false,
"sProject":"project 2",
"fInbox":false,
"sPersonOwner":"junaid"
},
{
"ixWorkflow":1,
"sEmail":"j.a#loxvo.com",
"sPhone":"",
"ixProject":2,
"ixPersonOwner":2,
"fDeleted":false,
"sProject":"Project Default",
"fInbox":true,
"sPersonOwner":"junaid"
}
]
}
}
}
With reference to https://stackoverflow.com/a/7284813/1105291
Please try below code before you pass json to Gson for object conversion, and please let me know if you get any error. Only posibility that I can see is exception at if.
JSONObject jsonObject = new JSONObject(responseString);
JSONObject projectsJsonObject = jsonObject.getJSONObject("response").getJSONObject("projects");
if(projectsJsonObject.getJSONArray("project") == null)
{
JSONArray jsonArray = new JSONArray();
jsonArray.put(projectsJsonObject.getJSONObject("project"));
projectsJsonObject.put("project", jsonArray);
}
//Pass jsonObject to Gson
Use Google Gson
JsonParser parser = new JsonParser();
JsonObject o = (JsonObject)parser.parse("{\"a\": \"A\"}");