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)
Related
Suppose I have the following JSON -
{
"list": [
{
"name": "John",
"age": 20
},
{
"name": "Peter"
"age": 18
},
{
"name": "Jane",
"age": 21
}
]
}
Is there a way in moshi in which we can skip the list item where the name is "Peter"?
My issue is that I need to show a list of items only if they match with certain values (eg. "imageType" = "jpeg") provided in json and skip everything else. I am wondering if one can do the skipping at the json parsing level rather than somewhere in the business logic where I would have to run a for loop and go through every element again.
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"
},
]
}
]
}
I am using Retrofit lib for API call in my Android application. My JSON is like this.
{"options": [
{
"type": "item",
"type_id": "19E9E453-64C6-41C9-BFB7-D6EFB8AF68B8",
"key": "ageRange",
"value": "Early 30s"
},
{
"type": "item",
"type_id": "19E9E453-64C6-41C9-BFB7-D6EFB8AF68B8",
"key": "colors",
"value": "Black, Red"
}
]}
Or
{"options": []}
My model code is:
#SerializedName("options")
#Expose
private ArrayList<OptionsDataModel> options;
So if options is not empty the code working fine but if options is empty I am getting error invalid item. So can any one help to solve this problem.
You can add a check in your response method for result.body != null before parsing your response to your object
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.