We Keep Coding

how to get array of objects from server

I'm trying to have a list of objects from a server. But I don't know how to do it exactly and at least print it in System.out.print
server sends data like that:
[
{
"userId": "15",
"routeId": "10",
"driverId": "2",
"text": "ytf",
"timestamp": "2018-05-25 13:04:01"
},
{
"userId": "15",
"routeId": "33",
"driverId": "2",
"text": "asd",
"timestamp": "2018-05-25 13:07:40"
}
]
And model:
https://pastebin.com/52mc5Gmw
https://pastebin.com/DnUTtkPC
Controller: https://pastebin.com/ucJFFJyy
And the API:
#GET("getReviews.php")
Call<List<reviewResult>> getReview();

You can use JSONArray for parse the array, and JSONObject for get each object of the array
Edit Add a example
JSONArray jsonArray = new JSONArray(response);
for(int i=0; i<jsonArray.length();i++)
{
JSONObject object = jsonArray.getJSONObject(i);
System.out.print(object);
}

From your code, looks like the expected return type should be List of reviewResponse objects. You should change the API to:
Call<List<reviewResponse>> getReview();
From there it's obvious how to retrieve the data you ask

Parsing JSON when nested or otherwise a bit more complicated than single values [duplicate]

This question already has answers here:
How to parse JSON in Java
(36 answers)
Closed 5 years ago.
Here's the JSON:
{
"firstName": "John",
"lastName": "doe",
"age": 26,
"address": {
"streetAddress": "123 Main street",
"city": "Anytown",
"postalCode": "12345"
},
"phoneNumbers": [
{
"type": "iPhone",
"number": "123-456-8888"
},
{
"type": "home",
"number": "123-557-8910"
}
]
}
The question is, in Java, how do you access the address fields? I tried things like address.city, but that didn't work:
String city = (String) jsonObject.get("address.streetAddress");
System.out.println(city);
Would appreciate any suggestions.

You need to call getString on the address object that you get.
String city = jsonObject.getJSONObject("address").getString("streetAddress");

{
"firstName": "John",
"lastName": "doe",
"age": 26,
"address": {
"streetAddress": "123 Main street",
"city": "Anytown",
"postalCode": "12345"
},
"phoneNumbers": [
{
"type": "iPhone",
"number": "123-456-8888"
},
{
"type": "home",
"number": "123-557-8910"
}
]
}
first get your address.Address is an object.{} means object,[] means an array.
JSONObject addressObj = jsonObject.get("address");
now you have a reference to the address.
String addressStr = addressObj.get("streetAddress");
String cityStr = addressObj.get("city");
int cityInt = Integer.parseInt(addressObj.get("postalCode"));
If i don't wrong remember there should be getString("streetAddress") and getInteger("postalCode") to avoid parse issues.

Apart from the given answers you should add a check to see if the address is not blank before checking city or else you will end up getting and exception.
Here is updated example:
if( jsonObject.has("address"){
JSONObject addressObj = jsonObject.get("address");
if( addressObj.has("city"){
String cityStr = addressObj.get("city");
}
}

Accessing Android JSON object

I'm downloading a JSON file with the structure:
{
"options": {
"toolbar": "1",
"full": "1",
"exit": "0",
"about": "0"
},
"general": {
"versioncontrol": "1.0"
},
"companydetails": {
"toolbaricons": {
"1": [
"Facebook",
"xxx",
"xxx"
],
"2": [
"Instagram",
"xxx",
"xxx"
],
"3": [
"LinkedIn",
"xxx",
"xxx"
]
},
"buttons": "4",
"openingtimes": {
"1": "10:00 - 16:00",
"2": "9:00 - 16:00"
}
}
}
I've managed to extract it from the server as a string which I am now storing in a variable.
I've tried
JSONObject jsonObj = new JSONObject(fileOutput);
JSONArray details = jsonObj.getJSONArray("options");
JSONObject c = details.getJSONObject(0);
But I cannot seem to extract anything from it. I want to be able to access all different bits in options etc and gather the information. I've tried to print to log the details of options etc, but I can't seem to get it to work. I had it working before but now the file structure has been updated and the old method I was using no longer works.

Options is not array but object, use:
JSONObject jsonObj = new JSONObject(fileOutput);
JSONObject options = jsonObj.getJSONObject("options");
int toolbar = options.getInt("toolbar");

Not getting JSON data in the order in which i have entered

I am fetching details from a database table which contains 3 rows in JAVA.
I am using JSONarray and JSONObject as follows
JSONObject jsonObject = new JSONObject();
JSONObject mainjsonObject = new JSONObject();
JSONArray ja=new JSONArray();
The data from table is put to the jsonObject as follows for each one:
String qry="select * from details";
ResultSet res = select .executeQuery(qry);
while(res.next){
String Name=res.getString("name");
String age=res.getString("age");
.
.
jsonObject.put("Name", Name);
jsonObject.put("age", age);
.
.
ja.put(jsonObject);
}
mainjsonObject.put("PERSONAL DETAILS",ja);
I should get the output json as follows(i.e. the order in which i entered):
{
"PERSONAL DETAILS": [
{
" name": "abc",
"age": "4",
"gender": "F",
"Place": "abc1"
},
{
" name": "xyz",
"age": "3",
"gender": "M",
"Place": "abc2"
}
]
}
But am getting the values in random order like below:
{
"PERSONAL DETAILS": [
{
"age": "4",
" name": "abc",
"Place": "abc1"
"gender": "F",
},
{
"age": "3",
" name": "xyz",
"Place": "abc2"
"gender": "M",
}
]
}
Please help me with a solution. I need to get all the values in the same order in which i have entered.

You can try something like this to build json object construct using LinkedHashMap and then pass it to the constructor like this ,
LinkedHashMap<String, String> jsonOrderedMap = new LinkedHashMap<String, String>();
jsonOrderedMap.put("Name", res.getString(1));
...
...
// struct you want
JSONObject JSONorder = new JSONObject(jsonOrderedMap);
JSONArray sortedJSON = new JSONArray(Arrays.asList(JSONorder));

How do I convert a list represented as a string to a list?

I am building an Android application which reads from themoviedb.org.
What I am trying to do is have the user enter a movie title and use that title to find its id.
When I run the query to search for movies, I get a response like:
{
"page": 1,
"results": [
{
"poster_path": "aaaaa.jpg",
"id": "11",
"description": "MovieDescription"
},
{
"poster_path": "bbbbb.jpg",
"id": "12",
"description": "MovieDescription2"
},
{
"poster_path": "ccccc.jpg",
"id": "13",
"description": "MovieDescription"
}
]
}
Using the Maven JSON library, I can fetch the results key as a string using json.get("results").
returning:
[
{
"poster_path": "aaaaa.jpg",
"id": "11",
"description": "MovieDescription"
},
{
"poster_path": "bbbbb.jpg",
"id": "12",
"description": "MovieDescription2"
},
{
"poster_path": "ccccc.jpg",
"id": "13",
"description": "MovieDescription"
}
]
But I want to convert the first of these results to another JSONObject so that I can get the movie's id from the first result.
I'm thinking that the way to do this is to convert the results value to a list of JSONObject and then use the json.get("id") method on the first object in the list. But I do not know how to do this conversion.
Any help would be appreciated.

You can use JSONObject.getJSONArray to get the result directly as a JSON Array:
JSONArray results = json.getJSONArray("results") // Get results as JSON Array
JSONObject first = results.getJSONObject(0) // Get first object as JSON Object
See: JSONObject#getJSONArray(String)