Just as the title says.. Is it possible to do this? Say I have a JSON array of something like this
{
"locations": [
{
"id": 1,
"loc": "miami"
},
{
"id": 2,
"loc": "manhattan"
},
{
"id": 3,
"loc": "lasVegas"
}
]
}
Sure, extend BaseAdapter and use the JSONArray as your backing model. However, it would be better (but by no means necessary) to convert it to a more "natural" representation in Java and use that instead.
you can convert the json to a java object. and bind the data.
Related
I have a very large json file within my android app with the following struture:
[
{
"id": 123,
"data": {
...
}
},
{
"id": 456,
"data": {
...
}
},
...
]
Depending on the item selected in the UI, I need to deserialize only the item with the corresponding id, but right now I'm deserializing the whole file and then do the filter, which takes time and memory to just extract the id I need.
Is there a way to deserialize only the section I need?
I'm using kotlinx.serialization.
I am trying to fetch JSON Object which has 2 list object with the same name, but has a different value. The object list named "items", the first "items" has "products_title,product_image,link", and the second "items" has "article_title, article_image,link". How to write PODO ?
I've been trying to writes PODO, but even i try to change the model, it still does not work. I try the other REST API, for the example "https://jsonplaceholder.typicode.com/pothos" its working fine. But if i try used my JSON its getting error, i wonder how to write PODO ?
this is the JSON i am using :
{
"data": [
{
"section": "electronics",
"items": [
{
"product_name": "Cellphone",
"product_image": "cellphoneImage.png",
"link": "https://cellphone.html"
},
]
},
{
"section": "facts",
"section_title": "Title section",
"items": [
{
"article_title": "Facts",
"article_image": "https://www.facts.png",
"link": "https://www.facts.html"
},
]
}
]
}
The JSON result for getUsers I get from the server looks like this:
{
"result": [
{
"meta": {
"rows": "3"
}
},
{
"items": [
{
"id": "1",
"name": "Steve",
"age": "30"
},
{
"id": "2",
"name": "Mary",
"age": "29"
},
{
"id": "3",
"name": "Bill",
"age": "58"
}
]
}
]
}
How can I deserialize it by GSON in my android app (I'm using retrofit)?
I can't imagine any wrapper classes because of the different object types in result.
Any help would be appreciated!
For good example
Converting JSON to Java
Other way, you can convert your json to a java object
Please use org.json library http://www.json.org/java/index.html
Then, for example
json = new JSONObject(YOUR_JSON).getJSONObject("result");
JSONArray items = data.getJSONArray("items");
String name = items.getJSONObject(0).getString("name");
You can write a TypeAdapter for a type that will be (de)serialized to(from) array. You can even make it generic, so it will work with type like Pair<A, B>. Here is an example for non-generic type: https://github.com/cakoose/json-tuple-databinding-examples/blob/master/java/src/GsonEntryCustomizer.java — it (de)serializes Entry to(from array).
Disclaimer — I have not written nor tested that code, but it seems legit.
If you only encounter such problem once (like in your example), you may not bother making it generic, just write TypeAdapter for your specific pair of 2 different classes. The reading code is quite straightforward:
in.beginArray();
SomeClass1 info1 = gson.getAdapter(SomeClass1.class).read(in);
SomeClass2 info2 = gson.getAdapter(SomeClass2.class).read(in);
in.endArray();
return new SomeContainerClass(info1, info2);
(see https://github.com/cakoose/json-tuple-databinding-examples/blob/master/java/src/GsonEntryCustomizer.java#L52)
Is it possible to pass an absolute url dynamically at runtime to retrofit?
For instance, I access a Rest API that returns a list of users and for pagination an absolute url that should be used to retrieve more items:
{
"result": [
{
"id": 1,
"name": "Daniel"
},
{
"id": 2,
"name": "Michael"
},
{
"id": 3,
"name": "Chris"
}
],
"pagination": "http://www.foo.com/users?offset=3"
}
It seems that it's not supported in Retrofit https://github.com/square/retrofit/issues/333
Is there a workaround that works with just one single RestAdapter?
It seems this is possible. Instead of passing an url to the RestAdapter.Builder.setEndPoint, you can pass a subclass of Endpoint, which you can use to dynamically set your url before every request.
I am successfully parsing a json which looks like this, which in this particular case represents an array with 2 items:
{
"items": [
{
"id": 1,
"name": "John"
},
{
"id": 2,
"name": "Mark"
}
]
}
However, I can't figure out how to parse one like this:
{
"items": {
"1": {
"id": 1,
"name": "John"
},
"2": {
"id": 2,
"name": "Mark"
}
}
}
As you can see, the second json is pretty similar to previous one, except after items it begins with "{", which means it is an object not an array, but I need that data to treat like an array.
Is this an invalid json, or I am missing something?
EDIT:
Ok, got it. The json is valid.
Let me please reformulate the question.
What I am actually looking for is how could I get the second json into a list of items.
Somewhere in the code I am doing this:
ItemsResponse itemsResponse = JsonMarshaller.fromJson(ItemsResponse.class, response);
and the ItemsResponse class:
public class ItemsResponse {
private List<Item> items;
// getters and setters
}
but it fails with an exception which says that the beginning of the json is an object, not an array.
SOLUTION:
The correct way is to use a Map instead of the List:
public class ItemsResponse {
private Map<String, Item> items;
// getters and setters
}
Read the answer of Ahmad Dwaik 'Warlock' here
You can check your json here