My JSON file contains strings with the same keys but some of them doens't appear for some strings. For example:
{
"city": "CB1 2BH Cambridge",
"addr": "Devonshire Road 1",
"title": "Devonshire Arms",
"phone": "+44 1223 6610"
},
{
"city": "E8 1JH London",
"addr": "Amhurst Road 90",
"title": "Pembury Tavern",
"web": "http://www.individualpubs.co.uk/pembury/"
},
{
"web": "http://bandholmhotel.dk/",
"title": "Bandholm Hotel",
},
{
"city": "00100 Helsinki",
"addr": "Pohjoinen Rautatiekatu 23",
"title": "Helkan Baari",
"country": "FI"
},
How to correctly parse it in android?
Considering this is your JSONArray,
Try to do as following,
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jObj = (JSONObject) jsonProductArray.getJSONObject(i);
String city = jObj.optString("city", "cityDefaultValue");
String addr = jObj.optString("addr", "addDefaultValue");
String title = jObj.optString("title", "titleDefaultValue");
String phone = jObj.optString("phone", "phoneDefaultValue");
}
One possible solution can be to have a modal class and use Gson library to parse the Json.
You can set some default values in your modal class, for keys whose value is not found in Json
Create an model class with the key of the json and parse it to the model class using gson.
A a = gson.fromJson(jsonRes.toString(),A.class);
here A is your model class and a is the instance of A
You can use Gson library.
Create something like that
class SomeObjects {
#SerializedName("city")
private String mCity;
#SerializedName("addr")
private String mAddres;
...
}
and in then
SomeObject obj = new Gson.fromJson(jsonString, SomeObject.class);
You also can sirialize right into array
Related
I am new in android JSON parsing android.
Below I mentioned my JSON value, please give the solution to how to parse the JSON value, thanks in advance my JSON Data:
Here I have category, categorybook, subcategory inside have subbook. I want to parse all the value and store it into sqlite with separate.
Like category book and sucategory book are stored seperate column in android sqlite table:
[
"category": {
"id": "1",
"name": "Education",
"categorybooks": [],
"subcategory": [
{
"id": "1",
"name": "tamil",
"subcategorybooks": []
},
{
"id": "2",
"name": "english",
"subcategorybooks": []
},
{
"id": "5",
"name": "maths",
"subcategorybooks": []
},
{
"id": "6",
"name": "science,
"subcategorybooks": []
},
{
"id": "7",
"name": "social",
"subcategorybooks": []
}
}
]
Here i have category 2 and its sub category books:
[
"category": {
"id": "2",
"name": "sports",
"categorybooks": [
{
"id": "4",
"name": "football",
},
{
"id": "5",
"name": "cricket",
}
],
"subcategory": []
}
]
First of all, you will need the VolleyLibrary. Then, you will need the GSON library. When creating GSON Request, you put the Object you want to get deserialized automatically from JSON, so you wont have to parse it manualy.
Second thing, you would want to create a db class that extends SQLiteHelper. When you create database, add the methods for adding, update and removing a row for every table that you create.
Below are the links that you need.
http://www.androidhive.info/2014/05/android-working-with-volley-library-1/
https://medium.com/android-news/android-networking-i-okhttp-volley-and-gson-72004efff196#.wp5lstsfv
http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/
I will assume you already have the content of your json, if not you can use any Http Connection to get the content.
You can use Gson to parse your json content, first of all, you need to create your models based on your Json:
//note: Gson identify the attributes name as the same of from your
//json, if not you have to put an annotation above each attribute of
//your class:
public class Category(){
int id;
String name;
List<CategoryBook> categoryBooks;
}
public class CategoryBook(){
int id;
String name;
}
public class SubCategory(){
//Based on your json I will assume the attribute of this class
// is a model that have a list of an object that have an id and a name
//and a list of subcategorybooks
}
public class SubCategoryBooks(){
//class attributes that you not mentioned in your json
}
Then you just need to parse your object from content using gson,
if you have some doubts about how to parse using Gson follow this tutorial
For insert into database separate, you already have your objects with getters and setters, for example
you can get the List<CategoryBook> from your CategoryModel, then your can insert this list
inside a separate table of your database.
Hope It's Help you
JSONObject jsonObject = new JSONObject();
jsonObject.put("category",loaddata());
public JSONObject loaddata(){
JSONObject jsonObject = new JSONObject();
jsonObject.put("id","1");
jsonObject.put("name","Education");
jsonObject.put("categorybooks",addcategorybooks());
jsonObject.put("subcategory","addsubcategory()");
return jsonObject;
}
public JSONArray addcategorybooks(){
JSONArray JsonArray = new JSONArray();
JSONObject jObj = new JSONObject();
jObj.put("id", "1");
jObj.put("name", "Foot Ball");
JsonArray.put(jObj);
return JsonArray;
}
public JSONArray addsubcategory(){
JSONArray JsonArray = new JSONArray();
JSONObject jObj = new JSONObject();
jObj.put("id", "1");
jObj.put("name", "Foot Ball");
jObj.put("subcategorybooks", addsubcategorybooks());
JsonArray.put(jObj);
return JsonArray;
}
public JSONArray addsubcategorybooks(){
JSONArray JsonArray = new JSONArray();
JSONObject jObj = new JSONObject();
jObj.put("id", "1");
jObj.put("name", "Foot Ball");
JsonArray.put(jObj);
return JsonArray;
}
If i understood you correctly, the main problem is to get java model object from json.
There are several ways to do it. The most common are:
Using built-in tools to operate with Json. In this case you get org.json.JSONObject and get values using it's methods. See details f.e. here
Using gson library. In this case you create model class and you can fill the object with one code line. smth like Category category = gson.fromJson(yourJsonString, Category.class); See details in official tutorial
I am sending request to the server and it gives me a response and giving data in JSON formats, now i want to fetch some specific value from that JSON format, so hot to do it.
{
"education": [
{
"school": {
"id": "2009305",
"name": "FG boys public high school Bannu Cantt "
},
"type": "High School"
},
{
"school": {
"id": "109989",
"name": "University of Engineering & Technology"
},
"type": "College"
}
],
"id": "xxxxxxx"
}
Now i need the school names from this xml,
Try this..
You response is in Json format not xml.
JSONObject json = new JSONObject(response);
JSONArray education = json.getJSONArray("education");
for(int i = 0; i < education.length(); i++){
JSONObject con_json = education.getJSONObject(i);
String school_type = con_json.getString("type");
JSONObject school_json = con_json.getJSONObject("school");
String school_name = school_json.getString("name");
}
It is not XML. it is completely in Json Standard format.
first build a JSONobject from your data:
JSONObject jsonObj = new JSONObject(result); //result = your Data String in fetched from server
then you cab retrieve what you want using its key. for example:
jsonObj.getString("id"); // it returns "xxxxxxx". as is in your data
I am trying to access the "display_name" object within the following JSON and I cannot seem to grab it. The example JSON is below.
{
"streams": [
{
"broadcaster": "fme",
"_id": 5019229776,
"preview": "http://static-cdn.jtvnw.net/previews-ttv/live_user_zisss-320x200.jpg",
"game": "Diablo III",
"channel": {
"mature": null,
"background": "http://static-cdn.jtvnw.net/jtv_user_pictures/zisss-channel_background_image-06a9d8c1113e5b45.jpeg",
"updated_at": "2013-03-04T05:27:27Z",
"_id": 31795858,
"status": "Barb sets giveaway and making 500m DH set... Join Zisspire, earn Zeny, collect prizes!",
"logo": "http://static-cdn.jtvnw.net/jtv_user_pictures/zisss-profile_image-502d7c865c5e3a54-300x300.jpeg",
"teams": [ ],
"url": "http://www.twitch.tv/zisss",
"display_name": "Zisss",
"game": "Diablo III",
"banner": "http://static-cdn.jtvnw.net/jtv_user_pictures/zisss-channel_header_image-997348d7f0658115-640x125.jpeg",
"name": "zisss",
"video_banner": null,
"_links": {
"chat": "https://api.twitch.tv/kraken/chat/zisss",
"subscriptions": "https://api.twitch.tv/kraken/channels/zisss/subscriptions",
"features": "https://api.twitch.tv/kraken/channels/zisss/features",
"commercial": "https://api.twitch.tv/kraken/channels/zisss/commercial",
"stream_key": "https://api.twitch.tv/kraken/channels/zisss/stream_key",
"editors": "https://api.twitch.tv/kraken/channels/zisss/editors",
"videos": "https://api.twitch.tv/kraken/channels/zisss/videos",
"self": "https://api.twitch.tv/kraken/channels/zisss",
"follows": "https://api.twitch.tv/kraken/channels/zisss/follows"
},
"created_at": "2012-07-01T21:09:58Z"
},
"name": "live_user_zisss",
"viewers": 775,
"_links": {
"self": "https://api.twitch.tv/kraken/streams/zisss"
}
}
],
"_links": {
"summary": "https://api.twitch.tv/kraken/streams/summary",
"followed": "https://api.twitch.tv/kraken/streams/followed",
"next": "https://api.twitch.tv/kraken/streams?channel=zisss%2Cvoyboy&game=Diablo+III&limit=100&offset=100",
"featured": "https://api.twitch.tv/kraken/streams/featured",
"self": "https://api.twitch.tv/kraken/streams?channel=zisss%2Cvoyboy&game=Diablo+III&limit=100&offset=0"
}
I start with:
JSONArray array = getJSONArray("streams");
JSONObject object = array.getJSONObject(4); // channel is entry 4 in array
String name = object.getString("display_name");
I'm not sure what I'm doing wrong here. With a more filled out JSON with multiple "channel" entries, I'm not sure how to handle it. I was thinking something like this?
String[] name = new String[array.length()];
JSONArray array = getJSONArray("streams");
for(int i = 0; i < array.length(); i++) {
if(array[i].equals("channel")
name[i] = array.getString("display_name");
I'm sure that last part is crude, and probably quite off from what it should be, but I'm not sure how to handle this.
Based on your JSON you have to do the following
JSONArray array = getJSONArray("streams");
JSONObject object = array.getJSONObject(0);
object = object.getJSONOBject("channel")
String name = object.getString("display_name");
The first item in you json array holds the channel object which contains the data you are looking for.
Channel is not the 4th item in your JSONArray but a nested object within the first. You have to be careful to follow the [] and {} brackets when parsing JSON because JSONObjects can contain multiple nested sub-objects and arrays.
JSONObject mainJsonObject = new JSONObject(json_string);
JSONArray array = mainJsonObject.getJSONArray("streams");
JSONObject channelObject = array.getJSONObject(0).getJSONOBject("channel")
String displayName = channelObject.getString("display_name");
How would I parse the following string in Android?
{
"C1": {
"name": "first name",
"address": "first address",
"lat": 36.072111,
"lng": 34.732112
},
"C2": {
"name": "second name",
"address": "second address",
"lat": 32.02132,
"lng": 34.000002
},
"C3": {
"name": "third name",
"address": "third address",
"lat": 37.05435,
"lng": 34.75703
}
}
I can't understand. Is it an objects inside of an object structure? How would this be parsed? How do I find how many objects I have?
Well, got it. the solution is to first get the names of the inner-objects:
JONObject json = new JSONObject(jsonString);
JSONArray namesArray = json.names();
which will give you an JSONArray of the existing objects inside.
Then run on it's objects to get each one of them:
for (int i = 0 ; i < namesArray.length() ; i ++)
{
currentObject = json.getJSONObject(namesArray.get(i).toString());
Log.d("TAG", "currentObject : "+currentObject.toString());
addCurrentObjectShopToObjectsListUsingGson(currentObject,objectsList);
}
You can use JSONObject to extract the contents of the structure.
An example can be shown below:
You can retrieve a JSONArray from your string with
JSONObject json = new JSONObject(jsonString);
JSONArray myArray = json.getJSONArray(ARRAY_NAME_HERE);
After doing so, you can extract the name of a person with
JSONObject person = myArray.getJSONObject(0); // retrieve the first person
String name = person.getString("name"); // get the person's name
Reference:
http://developer.android.com/reference/org/json/JSONObject.html
The string you've shown contains an outer object with 3 inner objects. Suppose you want to get C1.name. You would do this:
JSONObject root = new JSONObject(yourString);
JSONObject c1 = root.getJSONObject("C1");
String name = c1.getString("name");
However, I should point out one other thing, which is that the original string you are using is odd because it suggests that what you really want is an array. The code to parse would be different, of course, and involve JSONArray, but I think a better representation would look like this:
[
{"name":"first name","address":"...","lat":"...","lng":"..."},
{"name":"second name"...},
{"name":"third name"...}
]
So in this case, the outermost container is a JSONArray, not an object.
You need a "model" object that looks like this: (provided the hash is static).
public class TheCs extends BaseModel {
public OneC c1;
public OneC c2;
public OneC c3;
}
public class OneC extends BaseModel {
public String name;
public String address;
public float lat, lng;
}
public class BaseModel implements Serializable {
private static final long serialVersionUID = 1L;//use a random number here
}
Now when parsing with Gson, pass TheCs.class as the type.
If the Hash is not static you could (and Gson will do the right thing as far as I can remember), do something like:
public class TheCs extends BaseModel {
public List<OneC> someHash;
}
I have a JSON as shown below:
{
"places": [{
"name": "Ankola",
"slug": "ankola",
"category": "beach",
"distance": "521",
"travel_time": "8 hrs, 2 mins",
"days": "3",
"latitude": "14.669456",
"longitude": "74.300952",
"weather": "Summer 21\u00b0-36\u00b0C, Winter 12\u00b0-35\u00b0C",
"todo": "Baskal gudda, Nadibag, Shedikuli, Keni, Belekeri",
"about": "Ankola is a small town surrounded by numerous temples. It is in line with Arabian sea. Ankola is famous for its native breed of mango called ishaad and for cashews harvesting.",
"image": [
"Cm5NXlq.jpg",
"9OrlQ9C.jpg",
"DRWZakh.jpg",
"dFKVgXA.jpg",
"5WO2nDf.jpg"
]
}]
}
I know how to fetch key - value pairs, but i dont know how to parse array inside json to form a string array(image - in my case)
To summarize i want something like this:
I have 5 image names under "image" tag, i want them in a string array. How can i do this?
Use :
JSONArray images = yourJSONObject.getJSONArray("image");
for(int i = 0; i < images.length(); i++){
String image = images.getString(i);
}
This should do the trick as I remember.
Here you go:
JSONArray ja = whatEverYourJsonObject.getJSONArray("image");
for(int i=0; i<ja.length(); j++){
String name = ja.getString(i);
}
You first have to convert the JSON string to a Java object (JSONObject). Then, you obtain your JSONArray and iterate over it.
Example:
JSONObject jsonObj = null;
try {
jsonObj = new JSONObject (jsonString);
JSONArray images = itemObj.getJSONArray ("images");
int length = images.length ();
for (int i = 0; i < length; i++)
Log.d ("Image Filename", images.getString (i));
} catch (JSONException e) {
e.printStackTrace();
}
EDIT: Now I see that your JSON is invalid - you have an object for each image and that object contains only the value part of the data. An example of a valid images array would be as follows:
{
"image": [
"Cm5NXlq.jpg",
"9OrlQ9C.jpg",
"DRWZakh.jpg",
"dFKVgXA.jpg",
"5WO2nDf.jpg"
]
}
I would suggest:
Create your own class which describes your data structure defined
by those json object. As a last resort you can even generate Java
class based on JSON string - look at
jsongen
When you will have your own Java class (let's say MyClass) you can easily parse JSON to your generated Java class using GSON, like:
MyClass myClass = gson.fromJson(jsonString, MyClass.class);