I have a valid json link, and I want to fetch data from it.
This is my code, for fetching data:
try {
JSONObject topicsObject = new JSONObject(getTopicsJSON);
JSONArray topics = topicsObject.getJSONArray("Topics");
for (int i = 0; i<topics.length();i++){
SuperTrenerTopic stt = new SuperTrenerTopic();
JSONObject sub_topic = topics.getJSONObject(i);
JSONObject topic = sub_topic.getJSONObject("Topic");
...
}
On the last line of code, I get ann error saying org.json.JSONException: No value for Topic.
Following screenshot shows that it is not correct, as I Log-ed the recieved JSON, and you can clearly see that in fact, there IS a "Topic" object out there:
First Log represents the first part of an entire Json responce, and the second one is the Topic object itself.
Here is another screenshot of the JSON format i took from my browser:
You can notice that "Topic" and "meta" objects are on the same hierarchy level.
I fetch "meta" object with no problem whatsoever, using the same code I would use for fetching 'Topics", but for some reason, fetching "Topics" doesn't work out.
here is the code I successfully use to fetch "meta' object:
JSONObject meta = sub_topic.getJSONObject("meta");
What could be the cause of this?
Is there something realy obvious that I'm missing out?
Related
I am trying to build an android app that uses the github api.
I am facing an issue with JSON parsing.
I have a function that looks for JSONArray and produces the corresponding JSON data to show them in the UI, but the problem is the function works only when the JSON root is an array.
For ex-
when the url is "https://api.github.com/users", it works perfect, since the root is an array but now when I go to url such as "https://api.github.com/users/mojombo", the JSON root becomes an object. How do I parse it now in order to show the data in the UI ??
Do I have to write separate function for JSONObjects??
**The java function is **
private void makeJSON(String res) throws JSONException {
JSONArray root = new JSONArray(res);
for (int i =0; i<root.length();i++){
JSONObject jsonObject= root.getJSONObject(i);
String name = jsonObject.getString("login");
int id = jsonObject.getInt("id");
}
}
The answer is yes. Here you try to parse different types of objects (users list and particular user info) in single function. This is violation of single responsibility principle.
You can divide this function in 2 (to parse users list and user data) but better is to use Retrofit 2 for this.
I'm currently deveolping an Android application that has Django framework as it's server side.
When i'm posting a data of a new user to my database i am POSTing a multipart request that has a user part inside.
The user for some reason is represented as a list but when i take it out of the request.data['user'] it's a str instance (Yea i dont know why...)
When i fetch that str i started working on it with json package.
I looked up on the internet (to many places..) how to convert a string in json format to a dictionary.
What i found is that when you use the json.loads command it doesn't give a dict back but a str instance :)
This is the code on my server side when i enter the create function of the ModelViewSet that handles the creation of the user.
userJson = request.data['user']
userJson = json.dumps(userJson)
userJson = json.loads(userJson)
What i tried to do is to make a string of my own in JSON format and that called the json.loads() command which gave me the dict object..
There seems to be a problem with processing the str from the http request of django rest framework for some reason or there's something else i am not seeing.
I tried the following links -
Converting JSON String to Dictionary Not List
http://docs.python-guide.org/en/latest/scenarios/json/
Didn't worked also..
Now, i tried accessing the str i got from json.loads() like a dictionary in this way.
id = userJson['id']
Now lets say maybe i passed a wrong json format to the loads function, it should have thrown an exception..
The code above (getting the id) raised an exception of 'String indices must be integer' - it doesn't convert it to dict! LOL xD
Good note worth mentioning - I'm trying to convert the json to a dictionary so i could access it like this - dictObject['id']
Well i would really appreciate every help!
Thanks :)
For some reason , when i did this commands-
userJson = request.data['user']
userJson = json.loads(userJson)
userJson = json.loads(userJson)
What i got to have inside the userJson after the second json.loads(userJson) I got the actual dict object to the userJson member.
Appearently it is a bug.
21 January - another update, I truly was doing double Json encoding on the Android application so that was the reason for double json. loads()
Here's my JSON data sample:
{
"node_1.1":{
"someCrap":{
"someCrap":"SomeValue"
}
},
"node_1.2":{
"Node_1.2.1":{
"Node_1.2.1.1":{
"param1":value,
"param2":value,
"param3":"value",
"paramThatIneed":{
"ThisIsWhatIActuallyNeed":"url",
"width":96,
"height":72
}
},
"Node_1.2.1.2":{
Same as above, just that paramThatINeed might be missing, gotta place imagePlaceHolder Here
},
//and so on... there are a total of 50 of these..
}
}
}
Now I could get the node_1.1 and Node 1.2 and the sub-node of it node_1.2.1
However, there are 50 sub-nodes inside of node_1.2.1, and they will have random names returned from the server. Its in string format but they're actually ints. Its a page ID.
Now I wanna iterate through the node_1.2.1 and get those sub-nodes and access their sub-nodes and take in the URL of the paramThatINeed. If the paramThatINeed is not present, I need to put some null/dummy value.
This is the code that I tried to work it as far as I've reached:
JSONObject jsonObj = new JSONObject(jsonStr); //jsonStr is the entire JSON string
JsonObject node_1.2= jsonObj.getJsonObject("node_1.1");
JsonObject node_1.2.1 = node_1.2.getJsonObject("node_1.2.1");
What do I do after this? Because I can only getJsonObject by passing a string param to it, I tried using the for loop but it doesn't take any int param.
Also, as I said before, the nodes after that have random names and not fixed. So I'm totally confused.
Please help me out if you know how to solve this problem. Please remember there's no JsonArray in this. I'm probably thinking of editing the JSON string itself and replacing some parts of the '{' with '[' and converting it to an array :( ... I think that's a sad approach.
Use this to iterate over an object.
Android (JSONObject) How can I loop through a flat JSON object to get each key and each value
but be careful, from json object you won't get the result in original order, like in json array. The result will be in alphabetical order (I hope I was clear). And you can use optJsonobject(), instead of getJsonObject(). It will returns null, instead of throw exception. You can use opt every where instead of get.
A PHP script is sending to an Android app some data in the following format
[{"event_id":"4","message":"test"},["person1","person2"]]
I want to exact the 2 elements from this array into other arrays so I can easily manipulate the data. I got to the point in which the above response from the server is being converted into as string. What I can't seem to be able to do is to parse the data into arrays. I'm trying something on the following lines:
receivedData = new JSONArray(result); //result is the string response from the server
JSONArray array1= receivedData.getJSONArray(0);
JSONArray array2= receivedData.getJSONArray(1);
int len = array1.length();
but lenis not giving me back anything :(
What am I doing wrong and how could I change it.
Many thanks
What if you start by invoking new JSONObject(result); and then pulling an array out of that? I suspect you're trying to pull an array out of something that is not an array. Your PHP should not return something wrapped in [ ] it should return it wrapped in { }... also I believe your third JSON element (the array itself) is just hanging about without a label, which I believe is illegal.
so...
if your php produced this:
{"event_id":"4","message":"test"},"people": ["person1","person2"]}
and your java was this:
JSONObject j = new JSONObject(result);
String [] people = j.getJSONArray("people");
I believe you'd have what you are after.
I have a question that I am a little bit confused about. I am quite new to JSON and getting JSON values in the android API. I am trying to access an array within the response I get. the JSON code I am getting is something like this:
Response:
{
"event": {
"participants": []
},
"status": "success"
}
How would I access the participants array and store their values. This is what I am trying at the moment... but I dont appear to be getting what I want.
try{
//get the JSON values from the URL.
JSONObject json = jParser.getJSONFromUrl("http://somesite.com/api/find?"+"somevar="+someJavaStringVar);
json_event = json.getJSONObject("event");
JSONArray json_array_participants = json_event.getJSONArray("participants");
} catch(JSONException e) {
}
The thing I am mostly confused about is... what is the arrays type equivalent to. Any advice or reasoning as to the correct way to get ahold of that variables value would be great... thanks guys.. :).
Think JSON is really just a key-value pairing. The JSONArray type is just an array full of objects (like Object[]) - it has no idea what the objects it contains are or what they're to be used for. Its up to you to assign meaning to the JSON stream based on what you know of the source. From what I see of your code, most of it looks fine, though I don't know what your jParser.getJSONFromURL() is doing. Typically, you would build the JSON from the response string like so:
String jsonString = getJSONFromUrl("http://somesite.com/api/find?"+"somevar="+someJavaStringVar);
JSONObject json = new JSONObject(jsonString)
JSONObject json_event = json.getJSONObject("event");
JSONArray json_array_participants = json_event.getJSONArray("participants");
You can iterate through the array like any other array to get subobjects or whatever:
for(int i=0; i < json_array_participants.getLength(); i++) {
JSONObject participant = json_array_participants.getJSONObject(i);
// Do stuff
}
As a side note - I WOULDN'T use GSON until you understand the underlying protocol, at least a little - because you never know when you might want to parse your JSON from a different language for some reason.
I would strongly recommend to use gson instead as your preferred parser since it will do all the job of serializing and deserializing for you except creating the domain objects.
This tutorial should get you going:
http://www.javacodegeeks.com/2011/01/android-json-parsing-gson-tutorial.html
This will depend on what the server is supposed to return. It could be an array of anything and if this is a public service, there should be a specification to go off of.
If you are in charge of the server portion as well, and you have a backing object, Google's GSON library is extremely easy to use. It will also keep type information straight.