I'm having an array of objects represented as JSON string that will be coming from an API server. Let's suppose we have some Movie Categories and actual Movies that belong to each category:
[
{
"id": "1",
"name": "Action",
"movies": [
{
"id": "1",
"name": "Movie 1",
"description": "Movie 1 Description",
"other": "Other..."
},
{
"id": "2",
"name": "Movie 2",
"description": "Movie 2 Description",
"other": "Other..."
}
]
},
{
"id": "2",
"name": "Drama",
"movies": [
{
"id": "3",
"name": "Movie 3",
"description": "Movie 3 Description",
"other": "Other..."
},
{
"id": "4",
"name": "Movie 4",
"description": "Movie 4 Description",
"other": "Other..."
}
]
}
]
The users of my android app will need to be able to browse through categories/movies.
Which of the following scenarios is better regarding the performance of the code and optimal memory usage?
Assume that there will be many channels and categories.
1. Parse the JSON string once, create ArrayLists of Category and Movie objects for each category that I will later use them for populating lists.
2. Create a Parser with few methods like get_total_channels, get_channel, get_category that will always parse the contents of the JSON string to return me the appropriate data to populate the lists.
3. Any other suggestion?
Related
I am a newbie to android. I am stuck at JSON parsing.
Following is my JSON, in this, the type of menu categories will be dynamic, and I want to arrange this JSON in sectioned recycler view.
Please help me out.
This is my JSON
{
"menu_items": {
"Plat": [{
"menu_name": "jambon à l'os",
"menu_cost": "18.00",
"menu_count": "1",
"category": "Plat",
"menu_tax": "5.50",
"code": "€"
},
{
"menu_name": "tacos",
"menu_cost": "6.00",
"menu_count": "1",
"category": "Plat",
"menu_tax": "5.50",
"code": "€"
}
],
"Entrée": [{
"menu_name": "avocat",
"menu_cost": "7.50",
"menu_count": "1",
"category": "Entrée",
"menu_tax": "5.50",
"code": "€"
}]
},
"order_data": {
"order_id": "278",
"order_number": "REF-5d5e6b86",
"created_at": "1566468998",
"instructions": "",
"fullname": "Rohan Chitnis",
"phonenumber": "7610771871",
"useraddress": "Brest, France",
"image_path": "https://restau-at-home.bzh/uploads/attachments/Jellyfish_2019_08_21_10_49_21.jpg",
"wp": "pune",
"code": "€",
"promocode": null,
"promo_value": null,
"promo_type": null
},
"order_details": {
"total_items": "3",
"order_total": "31.50"
},
"promo_applied": "0",
"error": {
"code": "13",
"status": "200",
"message": "Ok"
}
}
Check this out. Create a generic response class. Extend your classes from that class. To do this properly you can look at Java Generics and Inheritance topics if you are using Java. And then search about Sectioned RecyclerView in Android. Here is a library for this.
Here's the JSON where jsonObject key is dynamic :
{
"CH000032": [
{
"type": "event",
"details": {
"programID": "MV10000032",
"programType": "MOVIE",
"title": "Titanic",
"year": "1997",
"rating": "PG-13",
"durationSec": 11640,
"startTimeSec": "",
"endTimeSec": "",
"language": "ENG",
"isHD": true,
"Genres": [
"Movies",
"Action"
],
"description": "A seventeen-year-old aristocrat falls in love with a kind but poor artist aboard the luxurious, ill-fated R.M.S. Titanic.",
"imageUrl": "http://res.cloudinary.com/dte07foms/image/upload/c_scale,h_405,w_270/l_Copyright_e3jt1k/v1508831090/Titanic_b0hqo0.jpg"
}
}
],
"CH000033": [
{
"type": "event",
"details": {
"programID": "EP10000132",
"programType": "EPISODE",
"title": "A Chic Bar in Ibiza",
"seriesTitle": "Two and a Half Men",
"seasonNumber": 12,
"epsiodeNumber": 2,
"year": "2014",
"rating": "TV-14",
"durationSec": 1260,
"startTimeSec": "",
"endTimeSec": "",
"language": "ENG",
"isHD": true,
"Genres": [
"Comedy",
"Romance"
],
"description": "Alan has second thoughts about getting married when Walden has him sign a prenup.",
"imageUrl": "http://res.cloudinary.com/dte07foms/image/upload/c_crop,h_405,w_270//l_Copyright_e3jt1k/v1508831090/2AndHalfmen_splkro.jpg"
}
}
]
}
I would like to parse this JSON. Please let me know how should the class
be written with #SerializedName annotation using Retrofit.
Note : CH000032, CH000033 etc are dynamic.
You can use Map<String, ModelClassName> in your model class for dynamic like below :-
public class Data {
#SerializedName("your_key")
#Expose
private Map<String, ModelClassName> result;
//....
}
this can help to parse dynamic key in retrofit.
What you are asking will take much work , instead a better approach will be to change the structure o json to something like this -
"data": [
{
"type": "event",
"programID": "MV10000032",
"programType": "MOVIE",
"title": "Titanic",
"year": "1997",
"rating": "PG-13",
"durationSec": 11640,
"startTimeSec": "",
"endTimeSec": "",
"language": "ENG",
"isHD": true,
"Genres": [
"Movies",
"Action"
],
"description": "A seventeen-year-old aristocrat falls in love with a kind but poor artist aboard the luxurious, ill-fated R.M.S. Titanic.",
"imageUrl": "http://res.cloudinary.com/dte07foms/image/upload/c_scale,h_405,w_270/l_Copyright_e3jt1k/v1508831090/Titanic_b0hqo0.jpg"
},
{
"type": "event",
"programID": "MV10000032",
"programType": "MOVIE",
"title": "Titanic",
"year": "1997",
"rating": "PG-13",
"durationSec": 11640,
"startTimeSec": "",
"endTimeSec": "",
"language": "ENG",
"isHD": true,
"Genres": [
"Movies",
"Action"
],
"description": "A seventeen-year-old aristocrat falls in love with a kind but poor artist aboard the luxurious, ill-fated R.M.S. Titanic.",
"imageUrl": "http://res.cloudinary.com/dte07foms/image/upload/c_scale,h_405,w_270/l_Copyright_e3jt1k/v1508831090/Titanic_b0hqo0.jpg"
}]
I want to know how to filter data. I got data with category name but cannot filter category wise.Here is my data:
{
"TITLE": "tea",
"PRICE": "17",
"QTY": "1",
"CAT_ID": "33",
"CAT_NAME": "POPULAR PRODUCTS",
"TYPE": "veg"
},
{
"TITLE": "Coffee",
"PRICE": "102",
"QTY": "1 ",
"CAT_ID": "8",
"CAT_NAME": "MORNING SPECIAL",
"TYPE": "veg"
},
{
"TITLE": "Jeera chachh",
"PRICE": "42",
"QTY": "1",
"CAT_ID": "33",
"CAT_NAME": "POPULAR PRODUCTS",
"TYPE": "veg"
},
{
"TITLE": "Roti Ghee Wali",
"PRICE": "21",
"QTY": "1",
"CAT_ID": "33",
"CAT_NAME": "POPULAR PRODUCTS",
"TYPE": "veg"
},
{
"TITLE": "Paneer paratha",
"PRICE": "102",
"QTY": "1 ",
"CAT_ID": "8",
"CAT_NAME": "MORNING SPECIAL",
"TYPE": "veg"
},
{
"TITLE": "Mix paratha",
"PRICE": "102",
"QTY": "1",
"CAT_ID": "8",
"CAT_NAME": "MORNING SPECIAL",
"TYPE": "veg"
},
I already parse the data but not able to set in fragment according to category.Can anyone solve my issue.
Step 1: Store the data in database.
Step 2: Search
select * from table where CAT_NAME = 'your_filter_category'.
or better ....CAT_NAME like %your_filter_category%.
In Case of no database;
Store the Data in list.
HashMap<String, ArrayList<Item>> map = new HashMap<>();
ArrayList<Item> itemList = new ArrayList<>();
Loop on List{
Item item = fromLoop index;
if(map.contains(item.getCat())){
itemList = map.get(item.getCat());
itemList.put(item);
map.put(item.getCat(),itemList);
}else{
itemList.clear();
itemList.put(item);
map.put(item.getCat(),itemList);
}
}
//after loop you will get HashMap with keys as categories and Values as the list of selected key category.
Step 3: Publish the results.
Note: No one will do your homework here. the only thing we can do for you, we can assist you how to do.
enter your code to: JSON Formatter and you will see that something is invalid in your JSON, it has multiple root elements. Maybe you should store whole code in JSONArray like this: `
{
"features":
[{
"TITLE": "tea",
"PRICE": "17",
"QTY": "1",
"CAT_ID":"33",
"CAT_NAME": "POPULAR PRODUCTS",
"TYPE": "veg" },
{
"TITLE":"Coffee",
"PRICE": "102",
"QTY": "1 ",
"CAT_ID": "8",
"CAT_NAME":"MORNING SPECIAL",
"TYPE": "veg"
}]
}
for save the user - http://aeps.gear.host/api/Test/SaveUser
INPUT
{
"Name": "sample",
"EmailId": "sample#gmail.com",
"MobileNo": "9876543210",
"Gender": "MALE",
"Latitude": "99.99",
"Longitude": "99.99",
"Birthdate": "05-03-2017"
}
OUTPUT
{
"$id": "1",
"Status": true,
"Data": "[{}]",
"Message": "Details saved successfully"
}
for get user
2) http://aeps.gear.host/api/Test/GetDetails
INPUT
{
"RegistrationId": "0"
}
OUTPUT
{
"$id": "1",
"Status": true,
"Data": [
{
"$id": "2",
"RegistrationId": 1,
"Name": "sample string 1",
"EmailId": "sample string 2",
"MobileNo": "sample string 3",
"Gender": "sample string 4",
"Latitude": "sample string 6",
"Longitude": "01-01-1900",
"Birthdate": "sample string 5"
}
],
"Message": "List generated successfully"
}
I want to Register the user details in registration screen and show all registered users in view user screen in android. I have a URL for get and post both with json response.
I want the user to register with name, mail , number and want to show in a simple list in next screen
I want to know that how can i fetch data through j sons. I.I am creating like this but did not get any data?
"arr": [1]
0: {
"obj": {
"id": "24"
"dispensary_id": "24"
"item_name": "item 3"
"total_feedback": "1"
"total_item": "13"
"followers": "7"
"follow_status": "following"
"category": "Edibles"
"strain": "Indica"
"tch": "0.70"
"cbd": "13.30"
"description": "testing items"
"image": "1447508911_greenfeed-3.jpg"
"qty1": "1/8 OZ"
"price1": "100"
"qty2": "1/4 OZ"
"price2": "200"
"qty3": "1/2 OZ"
"price3": "400"
"qty4": "1 OZ"
"price4": "799"
"dispensary_first_name": "Acme Dispensary"
"dispensary_last_name": "Smith"
"company": "Acme Dispensary"
"dispensary_image": "1449182412.png"
"city": "Irvine"
"state": "CA"
"status": "1"
}-
}-
-
"result": "true"
}
Use gson library for parsing JSON data. To learn how to use it go through with this link http://www.javacodegeeks.com/2011/01/android-json-parsing-gson-tutorial.html
your JOSN format is wrong it should be like this
{
"obj": {
"id": "24",
"dispensary_id": "24",
"item_name": "item 3",
"total_feedback": "1",
"total_item": "13",
"followers": "7",
"follow_status": "following",
"category": "Edibles",
"strain": "Indica",
"tch": "0.70",
"cbd": "13.30",
"description": "testing items",
"image": "1447508911_greenfeed-3.jpg",
"qty1": "1/8 OZ",
"price1": "100",
"qty2": "1/4 OZ",
"price2": "200",
"qty3": "1/2 OZ",
"price3": "400",
"qty4": "1 OZ",
"price4": "799",
"dispensary_first_name": "Acme Dispensary",
"dispensary_last_name": "Smith",
"company": "Acme Dispensary",
"dispensary_image": "1449182412.png",
"city": "Irvine",
"state": "CA",
"status": "1"
}
}
for this you can check on whether your json is valid or not http://jsonlint.com/
for creating json you can use some library like
JSONObject jsonObject = new JSONObject();
jsonObject.add("key", "value");
jsonObject.add("key", "value");