Jsonelement get value by key kotlin. Kotlin Get Value from JSON.

Jsonelement get value by key kotlin For such situation how can we efficiently perform below operations: Adding primitive properties; Updating primitive properties; Deleting primitive properties The key "test" in the myJSONString variable has a value of 100. The JsonPrimitive class, in turn, provides converters to Kotlin primitive types: int , intOrNull , long , longOrNull , and similar ones for other types. KotlinX Serialization is still in experimental phase, so they introduce breaking changes in new releases. although, I get the account, and all the values are the same, and The hashCode is the same, and I can't get the value of this Account. Json's JObject, you can traverse and access values within the JSON Document Object Model (DOM) using the JsonElement and call conversion APIs on it to get . val keyByIndex = item. 1. Is there any way to get list of arguments in Kotlin for function. So there is the question number, question, answers and points for each answer. io. However, it won't always be O(1), and that is the side effect of the non-allocating design. A word of warning, concerning the covariance out K?. This is why I want to get the last key, value pair to check against the current key,value pair. Json instance can be configured in its Json {} factory function using JsonBuilder. your split could also be written as follows:. Int this is obvious, the value of such an argument will be passed into a function and the outer variable will not be modified. It creates a range of indices and maps each index to an item corresponding to this index. How to dynamicly get the name of a variable in Kotlin? I saw the same question in Java: Java Reflection: kotlinx-serialization / kotlinx. Hot Network Questions Regarding power consumption of electricity So to get all the values from a map, you can just use the built-in values property on the map like this. values(). * @Serializable data class User(val Accessing Values by Key. Note that this collection may contain duplicate values. json:json:20220924 dependency to your project. Like how you would with Newtonsoft. Thats is how to convert a VALID string double into a double Double. Ask Question Asked 6 years, 3 months ago. Whats wrong? how can get the value of any JsonElement? JsonElement. The key "customer_id" has a value of 2947, which can be accessed using either order["customer_id"] or order. JSONObject internally uses HashMap. Returns the original receiver. @augur's answer works fine; Maybe a cooler Kotlin way exists to fulfill this requirement? I'm a beginner still in that language. The only thing you need to be concerned with is that every returned value must be Add SerializedName name for object also and add custom getter . Kotlin: Check if JSONObject key exists. JSONObject var j:JSONObject This article explores different ways to find the maximum-value entry in a Kotlin Map. Alos, convert List to JSON: val gson = Gson() val json = gson. so if get response from the server each key will map with JSON. Modified 2 years, 3 months ago. Eugene. This simplicity allows for easy retrieval of values, even in complex structures. DbSchema is a super-flexible database designer, which can take you from designing the DB with your team all the way to safely deploying the schema. The JSON looks lik Get all key-value pair from nested JSON array. I found my question almost has an answer for Java Check if JSONObject key exists to use the has() operator. fun takeInt(a: Int) { a = 5 } Kotlin get value by key from map. I actually don't think it's possible. Json. json library) then the following can be used. putInsensitive(k: String, v: Int) { this[k. Improve this question. inline fun < T > Json. JSONObject$1 cannot be converted to JSONArray You can simply iterate through dataList to get list of Xyz objects or get first JsonElement(object of Xyz) using get() method. How to get data from a json array without directly making reference to the array name. I could successfully call the entire json data,jsonOutput. get Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Is there any way to check a HashMap if it contains a certain set of keys which keys are given in an array. Here is my function - It is a Kotlin Map from String keys to JsonElement values. productName},{it. 1. Follow edited Sep 28, 2017 at 0:20. Properties. Follow edited Mar 3, 2017 at 18:41. toMap() So just add the org. 6, we can directly use one of the following static methods in this class. You define a data class and deserialize the JSON into an instance of that class. fun <T> HashSet<T>. Get simple string from JSONObject-4. How to set val property with Kotlin reflection? 1. serialization. memberProperties @Suppress("UNCHECKED_CAST") fun <R> readInstanceProperty(instance: Any, It uses the same principles like Java. eachCount() // Creates a Map<String, Int> where the Value is the count of repeated Keys. findByHashCode(hash: Int): T? = getElement(HasHash(hash)) Also if there are multiple elements with the desired hashcode in the set you'll just get one of them. getInsensitive(k: String, v: Int): Int? = after I get the Account I check if it is in the Hashmap, and I get false. I suggest that you convert the list of keys to a set which reduces the contains operation to O(1) operator fun JSONArray. answered Mar 2, 2017 at 8:02. I want to get status value from this json. Kotlin reflection Is it possible to encode / decode any valid json objects in string format in a custom serializer. Kotlin get declared member property value. Data looks like this How to group values with unique incremental keys in Kotlin? 2. parseDouble(result); If you are using optString("key") method to get String value then don't worry about keys are existing or not in the JsonObject. Ask Question Asked 3 years, 1 month ago. Here you just need to create a custom data model class with the name and value variables. FileReader; import java. 00, you call the parseDouble method from the Double class. No. startsWith("aaa") }. lang. Ask Question Asked 4 years, 3 months ago. And, of course, it Kotlin reflection doesn't have functions like getDeclaredField(). A key doesn't have a "name"; it's not "called" anything as far as the map is concerned - it's just a key, and will be compared with other keys. How would I do that? There are several ways to convert a HashMap to JSON in Kotlin. containsKey(arrayOf("2018-01-16")) If I try the following code it works but I need to check for the keys and the numbers of keys that I need to search is not fixed. Here is an example: import Let's explore, step by step, how to write a JSON parser in Kotlin using JetBrains IntelliJ IDEA and extract values from a JSON string. This code handles both hardware and software enter key. This is currently an @Service class AServiceImpl( private val repository: ARepository, // autowires the objectMapper private val objectMapper: ObjectMapper ) : AService { override fun getMessage(id: Long): Map<String, Any>{ val entity = repository. Using entries property. Hot Network Questions Keeping meat frozen outside in 20 degree weather Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company In Kotlin, a map is a collection of key-value pairs, where each key is unique and maps to exactly one value. 3. This class represents a JSON object and allows you to access its properties using keys. elementAt(0) // Get key by index. map. Here are two methods: Using JSONObject and JSONArray: Create a HashMap with some key-value pairs: val hashMap = HashMap<String, Any>() hashMap["name"] = "John" hashMap["age"] = 30 hashMap["married"] = true Convert the HashMap to a JSONObject: val jsonObject = Your question isn't at all clear I'm afraid. second } Book::class. Java how to get value from Map by key-object. Hot Network Questions What would cause species only distantly related and with vast morphological differences to still be able to interbreed? Kotlin Get Value from JSON. thenBy { it }) // Must have the Key type You'll need to use an Iterator to loop through the keys to get their values. java argument specifies the target class type to which the JSON should be deserialized. iterator() Now when you use JSONArray in for statement this extension is invoked to get an iterator. associateBy({it. Solutions given in above answers does solve the problem but I think a small change is warranted. edit : Once you have the object of json you can get values by using keys. 1 Get value from map in kotlin. groupBy { it. val (key, value) = it. The is because runningFold does fold everything into one value like fold. hasNext()) { val key = keys. Examples Basic Usage I'm making a quiz app in Kotlin where there is a question with between 2 and 5 answer options together with scores. JS. Some more background, This is for mainly testing a rest end point. * import kotlinx. 0 How to get values from an object in a hashmap in kotlin android using mvvm. val listA = ArrayList<User>() this list contains some users with their id,name, and email so i need to get all user's whose names are john and id,email will be any value You can use values like so: val genders = Gender. – Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company “Data is the key”: Twilio’s Head of R&D on the need for good data. The JSONObject class in Kotlin provides a convenient way to parse the JSON objects. Instead, it keeps all steps in between working as a history of all mutations. The recommended solution is to find the maximum value entry in the map is using the maxWith() function that accepts a Comparator to There's myMap. For example, I have a raw HTTP GET response in my code i have an function that splits the response to a key value array. val item = HashMap<String, String>() // Dummy HashMap. keys() while (keys. It is always pass-by-value, you can imagine that a copy is passed. parseReader(JsonReader) parseReader(Reader) parseReader(String) Get early access and see previews of new features. toMap() so you can just do. sortedBy { (_, value) -> value }. Let me explain a bit more. MaxWith compares the items with each other and sorts them by the return value of the comparator. json / JsonElement JsonElement (common, js, jvm, native) sealed class JsonElement Class representing single JSON element. MaxBy. Is Java "pass-by-reference" or "pass-by-value"? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog In this example, order is the JSON object containing three key-value pairs. Can anyone help me out here? java; json; Share. Kotlin - retrieve data from HashMap of Key Value pairs. import kotlinx. Kotlin Get Value from JSON. The Map has also no reason to be mutable. remove("status") Update . Ask Question Asked 4 years, 11 months ago. getValue(keyByIndex) // Get value. Convenience method to get current element as JsonPrimitive. Then it won't work but I assumed that JSON only contains these two values. Functions. So you are mapping each item with itself as key? Does it mean that associateby{} automatically takes the hashcode() of the element as key. public class MyModel implements Serializable { @SerializedName("key") @Expose public String key; @SerializedName("value") @Expose public ArrayList<ValueModel> valueList; @SerializedName("value") @Expose ValueModel modelValue; public List<ValueModel> Kotlin get value by key from map. The issue that I am facing is that I need to take a list of object that has another list of object inside that has an Int value which I need to save and increment for every time I see the same value. Commented Sep 22, 2020 at 16:29. @Serializable data class Stub( val id: Int, val displayName: String, val payload: String ) but it was simple enough to implement manually using JsonElement. Can be JsonPrimitive, JsonArray or JsonObject. Improve this answer. decodeFromJsonElement (json: JsonElement): T Deserializes the given json element into a value of type T using a deserializer retrieved from reified type parameter. The number of input whitespaces should be equal to the subtraction of the column title (e. boolean. Modified 3 years, 7 months ago. For example the code below but not let it serialize as json string but as any valid JSON with unknown Kotlin. So the key is the category and the value is the shopping list items List that I iterate through a foreach method. android; kotlin; mvvm; hashmap; Share. Accessing an objects value by fieldName in Kotlin. Since this class also implements Map interface, you can use traditional methods JsonElement. toList(). values if you just want to iterate over one of those. values() * @param enumValue to search * @param defaultValue to return if not found * @return enum type or default value if not found or first enum Kotlin get value by key from map. How to get it. You can use the built-in JSONObject and do something as shown below. In this tutorial, we’ll explore possibilities to deserialize JSON when we cannot use a data class. Navigating Complex JSON Structures However, i am not able to put NULL value at value key, seems like Gson is simply ignoring that field, so after serialization i get "answer_id":123, "question_id":4567 so my server throws bad request. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Kotlin get value by key from map. From the Javadoc for Field. remove("email") in java. 2,621 4 4 gold badges 22 22 silver badges 35 35 bronze badges. JSONException: Value null of type org. If the key is not found, the function returns null. It gets converted to one key and multiple "Any" values with string, but in this case i expect that value is than just one entry of <String, JSONObject), any tips how to achieve this one level too deep converting? If you specify type as HashMap<String, JsonElement> you will get mapOf("key" to JsonPrimitive("thisIsMyKey"), "value" to I want to check if an entry in my JSONObject exists and is the type it should be to avoid an exception when used. Viewed 1k times Part of Mobile Development Collective 0 . Viewed 4k times 0 . I add an example with getters for this specific case but you should have a look at how getters work. 4k 8 8 gold badges 34 34 silver badges 58 58 bronze badges. values I am new at Kotlin and trying to catch up the language. I have a divider at the bottom of each item but I don't want to include it for the last item in the last category listing. And myMap. In the end I need a full back-and-forth mapping like provided below, needing to refer to a value, and get the enum, and refer to the enum, getting the value. Map; import An interface for indexing access to a collection of key-value pairs, where type of key is String and type of value is Any?. Perhaps this is what you meant to do: class Reflector { @JvmField val Foo = 1; fun printFields() { In order to be consistent, I would suggest you using horizontal tab \t as the divider. It is typically used by constructing an application-specific instance, with configured JSON-specific behaviour and, if necessary, registered in SerializersModule custom serializers. Gson JsonParser is used to parse Json data into a parse tree of JsonElement and thus JsonObject. entries if you want the actual Entry object, where your forEach variable would need to be { (key, value) -> } instead (i. 1 there are also helper methods available: val genders = enumValues<Gender>() With the above you can easily iterate over all values: enumValues<Gender>(). Follow asked Mar 9, 2017 at 5:41. data class ItemSizeDataModel( val name: String?, val value: String? Map Key Values to Dataclass in Kotlin. how to access a value in a map that is nested inside another map (in kotlin) Caused by: org. In general, if b may not have all the values of a as keys, you can do: Class representing JSON null value. I receive a JSON file back from a HTTP get request as a String. To align the text in the right columns, I would also create a method which adds some whitespaces right after the product name (e. Retrieve specific field in JSON. The standard way is to iterate over all key/value pairs using the entries property and compare each encountered value with the provided value until you get the corresponding key. Gson parse Json. getInt(Object obj):. KProperty1 import kotlin. values() Since Kotlin 1. 237 3 3 gold badges 5 5 silver badges 16 16 bronze badges. val valueOfElement = item. Android Kotlin Volley How to get value from Kotlin HashMap Answer. But this freedom comes with a cost. I'd use a getName() but i know in kotlin getter/setter are automated ( I'm not used to it) and ihaven't found anything useful on the kotlin doc. They even added some comment to it: HashMap is used on purpose to ensure that elements are unordered by the specification. But since I have not read it in the documentation and have not been able to confirm it by I am trying to work with a REST API that returns a JSON document who's structure depends on the value of a property named type. Whole hierarchy is serializable, but only when used with Json as JsonElement is purely JSON-specific structure which has a meaningful schemaless semantics only for JSON. fun Json. (2) you have no way to differentiate between, key not found vs key has legitimate value as "". Get particular key value from json in android (kotlin) Get particular key value from json in android (kotlin) 1. This is my data class which is used to upload data into firebase: class Data(var id : String, var productname : String , var username : String, var phonenumber : String, var address: String, var status: String) The most straightforward approach I can think of is to just treat the structure as a Map (of Map). Turn a list into a distinct list and map indices. fun HashMap<String, Int>. How to access an int inside of a array in a JSON file-1. This behavior allows you to check for the existence of a key and handle cases where the key is not present. val map = prices. Please note that parameters in Kotlin cannot be reassigned since they act like vals:. Parsing JSON. add. private val content: Map<String, JsonElement> Scenario: Suppose I already have one jsonObject with 50 properties in it and considering jsonObject at any key can have any number of depth. Adds key-value pairs from other to this. JsonObject can be used to get access to the values using corresponding keys in JSON string. If I understand you correctly that in your map() step you wanted to keep a Map, but transform its values, then you should use a mapValues() function instead: val Costs = Data . The JsonElement class has extensions that cast it to its corresponding subtypes: jsonPrimitive , jsonArray , jsonObject . Therefore, This article explores different ways to get a key from a specified value in Kotlin Map. How do you change the value of a JSONElement. associateBy(Type::value) fun fromInt(type: Int) = map[type] } Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog I think you can make this very easily with runningFold, because with it, you can transform a flow into another using a fold operation. Can comments be used in JSON? 7747. Get Enum value by reflection in Kotlin. I have a function that returns DayofWeek as a key and an Int as a value. Accessing array that is in Map. If they are not matching the key on the object should be updated with the value from the order Map. Kotlin, is it possible to access the pair of a map? 2. Remove entries. MaxWith. 15. Class representing JSON object, consisting of name-value pairs, where value is arbitrary JsonElement. This part will be useful to anyone arriving at this question purely based off its title. Here’s a basic example: I want to get the "temp" value inside the "weather" array of a city that i search with the "name" of the city. So, here I need to check if the keys list contains a key on a jsonObject and if the value for that key on the object is different from the value of the order Map entry. How Can I Parse Json And Create An List in android. Of course, the (E) -> V function is callable. how to return a specific JSON object by value. keys and myMap. val keys = jsonObject. instead when the child is referenced, i want it to retrive all the keys along with their values so that i can create a structure that looks like this productname: productprice Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I want to retrieve data from firebase using Kotlin and android studio. asSequence(). add (other: Json): Json. For demonstration purposes or trivial usages, Json How i create array from arraylist key & value in kotlin? Ask Question Asked 3 years, 7 months ago. Follow edited Apr 10, 2019 at 8:40. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This is how you get the name of a Kotlin Property (although only with an instance of the class). Finally, we use the content property of the JsonPrimitive to get the property’s value as a String . asked Sep 26, 2017 at 0:58. JsonObj. How to get enum value by passing value into it? 1. We can use the Kotlin Map<String, Any?> generic map definition for dynamic content deserialization or parser-specific JSON An interface for indexing access to a collection of key-value pairs, where type of key is String and type of value is Any?. maxBy { it. I am using serializeNulls() in Gson builder which should allow nullable values but it does not work for me. toSortedMap(), and their values with map. The whole hierarchy is serializable only by Json format. g jeans). The problem is map In Kotlin/Native it's just . Let's assume we have a map: val charToCount = mapOf('a', 3) The task is to retrieve the value 3 by the corresponding key. Also, it's not thread-safe, so your JSON might get corrupted if several threads try to use a single instance of In Kotlin you create a map like this: val items = mapOf("a" to 1, "b" to 2) and retrieve a value like this: val item = items["a"] The bracket will call the get function. where the value of payload should be the raw json string of the payload object. The Serialization library of Kotlin supports serializing objects in various formats, which includes JSON Objects. Modified 4 years, { /** * Get the value of a typed enum * @param enumValues array - You can get it with Enum. Inheritors I'm new on Kotlin and I'm trying parse a Json file to take your values. 0. public class ClassName { public int Administrator { get; set; } public int? User { get; set; } public int? Guest { get; set; } findBy() is an extension function of a function (E) -> V, which is a function from an enum instance to get its property value. Since Gson 2. So the cpu/memory benefits of lazy parsing are lost. streetName) // Inserts the value in it // Bonus points if there was a way to 'determine' the type of the field so that I don't risk to set for the key `streetNumber` a value that is `String` } you can't do it on the fly, you must map JSON into a data class and change any field you want in it and convert it to JSON again. long. fromJson(yourJsonString, YourModel::class. 3 Kotlin, is it possible to access the pair of a map? Load 7 more related questions Show fewer related questions Sorted by: Reset to default Know someone who can answer? Share a link How can I remove Json key "email" and its value from the JsonObject by using something like jsonObj. Since Kotlin 1. val map = list // List<String> . toBigDecimal() } } Even better, you can sum costs while grouping. site, I've seen on this site that someone suggested to implement Kotlin-reflection but I don't understand how I'm not supposed to get a parameter from a class by default. toJson(topic) android convert from JSON to Object: val json = getJson() val topic = gson. Read Topics list value from json response. long: Kotlin™ is protected under the Kotlin Foundation and licensed under the Apache 2 license. how can I set properties of a dataclass by its name. Having said that, I'd recommend you to take We then get the JsonObject from the JsonElement and use the [] (get) operator to get the value of any property as a JsonPrimitive. 11622. Share. Modified 4 years, 3 months ago. fromJson(json, Topic::class. Accessing fields from the values of a Map in Kotlin fails. Kotlin - Get value in array in JSON Object android. e. I have made the app in flutter where I used Map with one key (question number: question) and another key (answer option: score). java) I am trying to get a specific value from my JSON data. It returns the entry's value if the entry's key starts with "aaa", or null otherwise. values It returns a read-only Collection of all values in this map. How to get a reference to an enum class itself Considering a Map<Key, Value> object, we can sort by Value if the map is defined in a variable in order to insert it on the predicate:. The purpose of this is to store the changes made to a certain attribute, I store the name of the variable as the key and in the Pair I store the old value and the new value. json library has JSONObject. Yes, it offers the possibility to use the same method not only for Map<String?,Stuff?> but also for Map<String, Stuff?> (key nullable or not). serialization handle ignores unknown keys when deserializing into an object? Are the keys skipped during or after parsing? The Gson library also provides low-level JSON element representations, whose entry point is the abstract JsonElement class. Assume no two keys have the same value. toSortedMap(compareBy<String> { map[it] }. 2 Kotlin - retrieve data from HashMap of Key Value pairs. when I try to get the value of m_accountseExpense[accountToShow] i get null. val JsonPrimitive. val result = a. Then get value by key. removev working for me if I need to remove status key jsonObj. We can target this class during deserialization via: val jsonElement = Then i am trying to get the key and value by: jsonObj. using every time lowercase() String's method) keeping keys case insensitive. g. Get value from map in kotlin. name) } To map enum name to enum value use valueOf/enumValueOf like so: : The value associated with the specified key, or null if the key is not present in the map. Access object with an array of objects from json file kotlin. CostInUsd. Calling it will get the property value of the given enum instance. But if it really has many values this JSON should be just an array of string – iknow. You could do something like this: val maxPair = resultSet. This class is a part of the Parsing JSON in Kotlin is straightforward with kotlinx. and get the value of Administrator with class object. Load 7 more related questions Show fewer related questions When called with the key present in the map, operators overwrite the values of the corresponding entries. groupingBy { it } . 8. "Training Day 1" to "Blablabla") and also the values within the ArrayList (e. turn a Kotlin object into its JSON representation and back marking its class with the @Serializable annotation, and using the provided encodeToString and decodeFromString<T> extension functions on the Json object:. When I try something like the code below it returns false. getValue(v) } getValue can be safely used here since the key v always exist in b as a consequence of our assumption. findById(id) // here you have something more like a javascript Object val map: MutableMap<String, Any> = objectMapper Since the values of a and the keys of b will always match, you can do this with a single mapValues. Related. You may also be interested in destructuring, e. The main entry point to work with JSON serialization. The get function retrieves the value associated with the specified key. But what if you wanted to sort both? I want to sort a hashmap first by values, and then, if the values are similar, by keys. Modified 2 years, 6 months ago. reflect to get a value of a field. For maps, known to have no null keys, you needlessly pay the null comparison for every entry. each of the child is currently stored with name : productname and price: productprice. Instead, it has functions returning collections, like getMemberProperties(), and you can use the Iterable extension functions to find what you need. The assertion here is just because of my missing words. Get particular key value from json in android (kotlin) 1. Modified 4 years, 11 months ago. First of all, the argument of fromInt() should be an Int, not an Int?. Learn more about Labs. MaxBy converts the values to a comparable type, and compares by the computed value. First create a data class: data class YourModel( val Name: String, val Surname: String ) Use GSON to convert JSON to object like as below:. Nicholas K. Kotlin: get List object from JSON string. You can get key by index. productPrice}) val values = map. iterator(): Iterator<JSONObject> = (0 until length()). In my test I created java object matching to payload with Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Can I use kotlin. With Gson, this is relatively easy to do, as long as the Map structure is statically known, every branch from the root has the same depth, and everything is a String. Kotlin reflection: get instance of a member property. Rest assured extracting values in json response in java. mapValues { (_, v) -> b. “Data is the key”: Twilio’s Head of It seems that you are passing the Field variable it as a parameter getInt whereas the parameter should be the object the field belongs to this:. Ravi MCA Ravi MCA. Using maxBy() function. sumOf { it. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company But I can't figure out how to get the same result in kotlin. split(" = ") // no need to extract the When I get the top element "routes" its fine and printing it displays what inside the element but when I try to for example to get the element "summary" as shown, the return is null, thats whats is displayed in the output, so subsequently I cannot get the value of it. parseToJsonElement Kotlin: get List object from JSON string. Modified 2 years, 4 months ago. Eugene Retrieve enum by its given value, not the KEY. It returns the maximum value given by the extractor you pass to it, or null if the set is empty. Iterate Values of a dataSnapshot. Get data from JSONArray. val jsonObject = Json. The code can be reduced to: companion object { private val map = Type. I did it with a for loop but it slow, is there another better way to do it? Get particular key value from json in android (kotlin) 0. user7637864 user7637864. Using hashmaps and matching values. As you already said, you forgot a condition to check whether your string even contains a =. value hashmap from a Firebase. The first problem is that I don't know the keys and the second problem is that I don't know use Kotlin perfectely. We can use Kotlin’s method references as the (E) -> V functions, for example, NumberV4::value and OS::input. To remove an entry from a mutable map, use the remove() function. Json dll to the following class. fun <T>addToJson(key: String, value: T) { // Finds the key in the JSON, if nested, maybe expressing the whole path to it (i. Viewed 10k times 2 . toString properly prints JSON tree as valid JSON, taking into account quoted values and primitives. I also know you can easily sort a HashMap's keys by using map. Finally, we used dot notation to get and print the values of the JSON Object. What this code currently does is it looks for the key and retrives the vlaue. 4. I selected "0". keys. Json object response in kotlin. With getters. at trainingDay2 change "Player8" to "Player1"). full. Ask Question Asked 2 years, 6 months ago. Type; import java. Gson - How to parse partial json in Kotlin. Link copied to clipboard. Get data from nested json using GSON. NET values (such as GetProperty(String) and GetInt32()). Here's a Kotlin implementation, you will realised that the way I got the string is using optString(), which is expecting a String or a nullable value. To notify a change I use the Observer pattern. Throws I have an entity. import org. Members Members & Extensions. data class Account (accountId, username, password, active, date) Now i have a list of accounts and i want to get the accountId of the account that has active = 1 (The specifications of the app ensures that there is only one account with active = 1) I tried to map the accounts with active = 1 and then i should get the accountId of the only one returned Kotlin get value by key from map. how to access a value in a map that is nested inside another map (in kotlin) Hot Network Questions maximum() function does not work? As far as i understand, kotlin allows to override getter in data class, but i didn't succeed in it Trying to make “Data is the key”: Twilio’s Head of R&D on the need for good data How to get Jackson JsonProperty of enum values in Kotlin? 0. Viewed 2k times 0 . val map = JSONObject(string). . Category } . java) Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog You can desrilize this json using NewtonSoft. Modified 4 years, 4 months ago. generics; enums; kotlin; Share. The way it does all of that is by using a design model, a database-independent image of the schema, which can be shared in a team using GIT and compared or deployed on to any database. address. How to get a type parameter's class name? Hot Network Questions Bringing in a peanut butter sandwich to discourage lunch thief who has peanut allergy The latest version of the org. a single variable with two components) Implementation has a bug(s): (1) while-loop is continuing even after recursive call returns a legitimate value. Using Kotlin Serialization To Parse JSON . To retrieve values from a JSON object, you can use the JObject class provided by Newtonsoft. json. Working with maps in Kotlin is a common task, especially when dealing with structured or paired data. When calling remove(), you can I have ArrayList and i want to get him some specific object values and insert them to another ArrayList, but I can't get the specific values. Trying to get a Type using null will obviously lead to null, and a caller shouldn't even try doing that. Whole hierarchy is serializable, but only when used Best way is using kotlinx. 00 In order to "DOUBLEFY" this value of 100. Kotlin reflection: get instance of a member property How to get a function reference using reflection in Kotlin. Any suggestion? Thank you very much. How to extract nested values from JSON received from GoogleDistanceMatrix API in Java? 1. Does anyone know what`s the problem? Is there any way to return the id value after Entity update the value/ successfully insert it into table. Kotlin read property annotation via reflection. Looking at Kotlin's the source code for Maps, all that I see for the get function is this:. I am new to Kotlin (and Java) and had a question: I have a Hashmap called data. Problem is that for every key in the map they check if the list contains that key, which is O(n) operation, this is ok for small lists but once you reach a certain size it becomes very slow. Whole hierarchy is serializable, but only when used with Json as JsonElement In this article, we will learn how to parse JSON in Kotlin. Maps are part of the Kotlin Standard Library and are also known as dictionaries or associative arrays in other programming languages. customer_id. Furthermore I would like to add elements to trainingDay4. Checking Json type in kotlin. 2. mapValues { (_, value) -> value. How to parse JSON from an url using Kotlin on Android? 1. How does kotlin. If you're writing for Android (and thus have an old version of the org. JSONArray import org. public operator fun get(key: K): V? For this, you would need either to provide some extension function that would put and get the entry in some defined way (e. import java. 1 In this tutorial I will discuss about how to parse a class object into json string and convert it back from json string to class object in Android Kotlin using popular Gson library. My response is given below of array list, now i want to make new array list by ** job_date** key Kotlin: Get method parameter values. JSON tends to be a portable transfer format to allows the container implementations to rearrange their items for a faster element retrieval based on associative access. reflect. Some furter notes: you can replace your elementAt also with get or with the indexing operator (e. filterKeys { it. I have defined the main class as follows: @Serializable class Interaction( val type: Byte, val data: InteractionData? = null ) The structure of InteractionData depends on the value of type. Kotlin get reference name of an object. map { get(it) as JSONObject }. I need to access a specific entry by going to the first block (index 0) and then get the value for a specific key. For primitive types, e. how get Array json in kotlin from url. util. how to access a value in a map that is nested inside another map (in kotlin) Hot Network Questions Why does one have to avoid hard braking, full-throttle starts and rapid acceleration with a new scooter? 2 How do I get the value for the key rate_for_amount based on the data/result obtained, which is an object. optString(key) } Access Kotlin Interface/Class property by string key? Ask Question Asked 2 years, 4 months ago. I would like to change the key values (e. Function parameter names in Kotlin. Ask Question Asked 4 years, 4 months ago. Which JSON content type do I use? 9667. getString("id"); But its giving me null. next() val value = targetJson. Hot Network Questions Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Here is a function to read a property from an instance of a class given the property name (throws exception if property not found, but you can change that behaviour):import kotlin. JsonElement. Getting member variables through reflection in Kotlin. Viewed 5k times 7 . Get distinct values from collection. var yourModel = gson. Step 1 [Important] Specify in XML two attributes: android:imeOptions in order to show the user the correct button to press; android:inputType in order to tell the user what text he has to input, numbers text etc; Step 2 Add in your Kotlin file: I'm trying to convert a kotlin dataclass to a JsonElement, is there a way to do it using kotlin? @Serializable data class SubjectContext( val name: String, var programContext: Properties? = null ) @Serializable data class Properties( val color: String, var large: Int ) You can get direct access to the value at a specific index, using the indexer on JsonElement (so for example value[2]). obj - the object to extract the int value from. Add a comment | -5 I know hashmaps are not sorted by default. lowercase()] = v } fun HashMap<String, Int>. Kotlin get value by key from map. Notice in the example code the Metadata, Item and StatusContainer are package-private as well as their getters, it doesn't have to be this way but if they are package-private the public getter to access the data you want must be inside JsonElement is not a good fit because it still parses and creates objects. forEach { println(it. Pass an instance of the class as the first parameter of the getter/setter you want to use. Get particular key value from json in android (kotlin)-1. Viewed 1k times 2 I need to access a class instance property similar to accessing a map in Kotlin. Change to use (optional):-@PrimaryKey(autoGenerate = true) var id: Long = 0 /*<<<<< var not val + Long instead of Int */ you should really use Long for id columns as org. If you have could have more than one matching key, use filterKeys to get a map with all the non-matching keys removed, then get their values. Not able to print the value of a key of a Map in Kotlin. splitFormule[0]). Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Get early access and see previews of new features. g Description) and the product name (e. aeygn kdjujdci jzxi ilyem pwvc xeam cuohhn fxpygr awo jodmj