Develop Reference

How can I put JSON return in an array?

I'm a android beginner and I'm doing to access a JSON file in and it has an error. I have a problem in parsing this
JSONObject jsonObject = new JSONObject(jsonStr);
JSONArray accounts = jsonObject.getJSONArray("account_data");
for(int i=0;i < accounts.length();i++){
JSONObject a = accounts.getJSONObject(i);
sin = a.getString("sin");
account_name = a.getString("account_name");
address = a.getString("address");
status = a.getString("status");
due_date = a.getString("due_date");
total_amount = a.getDouble("total_amount");
sin_lbl.setText(a.getString("account_name"));
}
here is the JSON File
{"account_data":{
"sin":"200111-102 ",
"account_name":"LUMABAN, CRISTOM ",
"address":"352 MABINI ST.,, SABANG, Baliwag ",
"status":"A ",
"due_date":"2019-04-23",
"total_amount":"491.00"
},"code":1101,"message":"Account Info Retrieved"}
I have an error in putting it in array.

Instead of using JSONArray , try to use JSONObject.
String[] array = {json.get("sin"), json.get("account_name"), json.get("address"), json.get("status"), json.get("due_date"), json.get("total_amount") }

{"account_data":{"sin":"200111-102 ","account_name":"LUMABAN, CRISTOM ","address":"352 MABINI ST.,, SABANG, Baliwag ","status":"A ","due_date":"2019-04-23","total_amount":"491.00"},"code":1101,"message":"Account Info Retrieved"}
Actually, it's a json object, not array. So that you can not convert json object to json array
Difference between Json Array and Json Object:
A JSONArray is an ordered sequence of values. A JSONObject is an unordered collection of name/value pairs.
JSONArray: Its external text form is a string wrapped in square brackets with commas separating the values.
JSONObject: Its external form is a string wrapped in curly braces with colons between the names and values, and commas between the values and names.

Please use this json parshing
try {
JSONObject jsonObject = new JSONObject(jsonStr);
JSONObject accounts = jsonObject.getJSONObject("account_data");
sin = accounts.getString("sin");
account_name = accounts.getString("account_name");
address = accounts.getString("address");
status = accounts.getString("status");
due_date = accounts.getString("due_date");
total_amount = accounts.getDouble("total_amount");
sin_lbl.setText(a.getString("account_name"));
} catch (Exception e) {
}

if you asked about iterating on json object you could try this one
JSONObject jObject = new JSONObject(jsonStr);
JSONObject menu = jObject.getJSONObject("account_data");
Map<String,String> map = new HashMap<String,String>();
Iterator iter = menu.keys();
while(iter.hasNext()){
String key = (String)iter.next();
String value = menu.getString(key);
map.put(key,value);
}
so now you have your data into as pair of key and value
if you have a json array of this response you could do as following
JSONObject root = new JSONObject("your root");
JSONArray resultArray = root.getJSONArray("your array key");
for (int i = 0; i < resultArray.length(); i++) {
// here to get json object one by one and access every item into it
JSONObject resultObject = resultArray.getJSONObject(i);
posterPath = resultObject.getString("key");
title = resultObject.getString("key");
releaseDate = resultObject.getString("key");
description = resultObject.getString("key");
voteAverage = resultObject.getDouble("key");
}

How to get this json format value?

I want to get value from json.But I can't get value.
I want to get 26/08/15 value.
json format:
{"Timestamp":["26/08/15"]}
My code :
JSONArray timestamp = jsonObj .getJSONArray("Timestamp");
JSONObject timecatObj = (JSONObject) timestamp.get(0);
Iterator temp = timecatObj.keys();
serverdate = temp.toString();

JSONObject ob = new JSONObject("{"Timestamp":["26/08/15"]}")
JSONArray arr = ob.optJSONArray("Timestamp",null);
String date = arr.optString(0);

{"Timestamp":["26/08/15"]}, the value of "Timestamp" is a JSONArray, but the element of the JSONArray is String not JSONObject.
So, the code should be :
JSONArray timestamp = jsonObj.getJSONArray("Timestamp");
String serverdate = timestamp.optString(0);

Android parsing a JSON message

I'm trying to parse the following JSON string
String _message = "GetXTRONResult: \"[{\"xtron\":\"Acub1\"},{\"xtron\":\"Acub2\"},{\"xtron\":\"Acub3A\"}]\"";
JSONObject jsonObj = new JSONObject(_message);
//Try to convert to array
JSONArray array = jsonObj.getJSONArray("GetXTRONResult"); //FAILS !
What is the best way to parse the above please?
UPDATE:
This is what the value is during debugging:
{"GetXTRONResult":"[{\"xtron\":\"Acub1\"},{\"xtron\":\"Acub2\"},{\"xtron\":\"Acub3A\"}]"}
org.json.JSONException: Value .... at GetXTRONResultof type java.lang.String cannot be converted to JSONArray
SOLUTION THAT WORKED FOR ME:
I had to use the iterator as follows:
ArrayList list = new ArrayList();
JSONObject jsonObj = new JSONObject(_message);
Iterator<?> keys = jsonObj.keys();
if (keys.hasNext()) {
JSONArray array = new JSONArray((String) jsonObj.get((String) keys.next()));
for (int i = 0; i < array.length(); ++i) {
list.add(array.getJSONObject(i).getString("xtron").toString());
}

You have some errors in your json string, like "[.
You can't use quotes that wrap your list.
This one should work:
String _message = "{\"GetXTRONResult\": [{\"xtron\":\"Acub1\"},{\"xtron\":\"Acub2\"},{\"xtron\":\"Acub3A\"}]}";
JSONObject jsonObj = new JSONObject(_message);
//Try to convert to array
JSONArray array = jsonObj.getJSONArray("GetXTRONResult");
System.out.println(array);
Output: [{"xtron":"Acub1"},{"xtron":"Acub2"},{"xtron":"Acub3A"}]

To avoid your confusion when making JSON in java/android
you could use single quote (') instead of double quote (") for JSON inside Java Code
For example:
from
"{\"xtron\":\"Acub1\"},{\"xtron\":\"Acub2\"},{\"xtron\":\"Acub3A\"}"
to be something like this
"{'xtron':'Acub1'},{'xtron':'Acub2'},{'xtron':'Acub3A'}"

I think this is what you're looking for:
JSONObject rootObj = new JSONObject(jsonString);
String theArrayJSON = rootObj.getJSONArray("GetXTRONResult");
JSONObject theArray = new JSONObject(theArrayJSON);

Iterating through JSONObject

I parse the response from a web service into a JSONObject, which when logged, looks as follows:
{"Preferences":"{Pref1=Apple, Pref2=Pear}"}
I understand how to ask for the Preferences tag e.g. jsonObject.get("Preferences"). However, I do not understand what object I am getting back nor how to iterate over it. How can I iterate over the object returned by jsonObject.get("Preferences")?

the object returned by preferences is a String. If you want to iterate through the childs of Preferences you may want to change the structure, to for example:
{"Preferences":{"Pref1":"Apple", "Pref2":"Pear"}}
and parse it like this:
JSONObject inputJSON = new JSONObject("{\"Preferences\":{\"Pref1\":\"Apple\", \"Pref2\":\"Pear\"}}");
JSONObject preferencesJSON = inputJSON.getJSONObject("Preferences");
Iterator<String> keysIterator = preferencesJSON.keys();
while (keysIterator.hasNext())
{
String keyStr = (String)keysIterator.next();
String valueStr = preferencesJSON.getString(keyStr);
}
alternatively, if you want to keep your structure, you can parse the returned string by the Preferences object like this:
JSONObject inputJSON = new JSONObject("{\"Preferences\":\"{Pref1=Apple, Pref2=Pear}\"}");
String preferencesStr = inputJSON.getString("Preferences");
JSONObject preferencesJSON = new JSONObject(preferencesStr);
Iterator<String> keysIterator = preferencesJSON.keys();
while (keysIterator.hasNext())
{
String keyStr = (String)keysIterator.next();
String valueStr = preferencesJSON.getString(keyStr);
}

You can't iterate through above JsonObject, but if it were like this
["Preferences":{"Pref1":"Juan", "Pref2":"JuanK"}]
you could have done like
JSONArray array = new JSONArray(dataInStringForm);
for (int i=0;i< array.length(); i++)
{
JSONObject json = array.getJsonObject(i);
System.out.println(json.getString("Pref1"));
System.out.println(json.getString("Pref2"));
}

You can parse values from JSONObject and can use getJSONObject(i) in a loop if it's a JSONArray. In your case you should make your preferences a JSONArray
[{"Pref1":"Juan"},{"Pref2":"JuanK"}] so you can get it via getJSONArray() and then parse it better in a loop via getJSONObject(i)

Try this
Iterator<String> iter = json.keys();
while (iter.hasNext()) {
String key = iter.next();
try {
Object value = json.get(key);
} catch (JSONException e) {
}
}
If it is array then
JSONArray key= (JSONArray) jsonObject.get("yourKey");
Iterator<String> iterator = key.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}

Convert JSON string in array format into an array in java

I'm trying to take the following string that I got as a json object:
[
{
"id": "picture1",
"caption": "sample caption",
"picname": "sample picture name"
}
]
and turn it into a array so I can populate a list
I've tried turning it into a jsonarray by doing this:
JSONArray myjsonarray = myjson.toJSONArray(string_containing_json_above);
but that didn't seem to work.
==============
Here is full code with the working solution
myjson = new JSONObject(temp);
String String_that_should_be_array = myjson.getString("piclist");
JSONArray myjsonarray = new JSONArray(String_that_should_be_array);
For(int i = 0; i < myjsonarray.length(); i++){
JSONObject tempJSONobj = myjsonarray.getJSONObject(i);
showToast(tempJSONobj.get("caption").toString());
}
temp is the json from the server

Issue is here:
JSONArray myjsonarray = myjson.toJSONArray(temparray);
Solution:
JSONArray myjsonarray = new JSONArray(myJSON);
// myJSON is String
Now here you are having JSONArray, iterate over it and prepare ArrayList of whatever types of you want.

here you get JSONArray so change
JSONArray myjsonarray = myjson.toJSONArray(temparray);
line as shown below
JSONArray jsonArray = new JSONArray(readlocationFeed);
and after
JSONArray jsonArray = new JSONArray(readlocationFeed);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject explrObject = jsonArray.getJSONObject(i);
explrObject.getString("caption");
}

JSONArray isn't working because the JSON you provided is not an array. You can read more about JSON syntax here: http://www.w3schools.com/json/json_syntax.asp
In the meantime, you could manually create your array by paring the JSON one string at a time.
JSONObject strings = new JSONObject(jsonString);
String array[] = new String[5];
if (jsonString.has("id"){
array[0] = jsonString.getString("id");
}
if (jsonString.has("caption"){
array[1] = jsonString.getString("caption");
}
...
etc.