How can I write a block code in lambda expression in Kotlin? The Code A works well, I hope to write a block code for value -> println(value) . But Code B I writen is error, how can I fix it? Code A fun foo(): Flow = flow { println("Flow started") for (i in 1..3) { delay(1000) emit(i) } } fun main() = runBlocking { println("Calling foo...") val flow = foo() println("Calling collect...") flow.collect { value -> println(value)...

Can't save Arraylist<Int> into Room Database (TypeConverter added but not recognized) I am trying to store Arraylist and Arraylist into Room Database. As we know, Room doesn't support natively storing these data automatically. So I added four TypeConverters: public class Converters { @TypeConverter public static ArrayList fromString(String value) { Type listType = new TypeToken() {}.getType(); return new Gson().fromJson(value,listType); } @TypeConverter public static String fromArrayListString(ArrayList list) { Gson gson =...

Why can't I parallel operation when I use either delay() or yield() in Kotlin? The Code A, Code B and Code C get the same result Result All. I think the Code B or Code C should get the result Result MyThink because I have added either delay() or yield(). It seems that flow.collect {...} is a block function. Code A fun foo(): Flow = flow { println("Flow started") for (i in 1..3) { delay(500) emit(i) } } fun main() = runBlocking { println("Calling foo...") val flow = foo() println("Calling collect...") flow.collect {...

Evaluation of suspend calls is not supported in Android Studio Does anyone found how to debug Kotlin Coroutines in Android Studio while debugging? It sounds like it is not supported at this moment. My actual solution is to read logs, but I'm wondering if someone found a better one.

Can I instantiate a user object directly using MutableLiveData in kotlin? The Text A and Code A are from the artical . I'm very strange why they don't use Code B or Code C to instantiate the user object. I think Code B and Code C are very simple and clear. BTW, I havn't test Code B and Code C, but I think that they are correct. Text A When using LiveData, you might need to calculate values asynchronously. For example, you might want to retrieve a user's...

android studio can't find kotlin dependency I was trying to upgrade some dependencies for my android studio project and now I'm stuck with this error message whenever I try to build the project: Could not determine the dependencies of task 'appcompileDebugJavaWithJavac'.

Could not resolve all task dependencies for configuration 'appdebugAnnotationProcessorClasspath'.

> Could not find org.jetbrains.kotlinkotlin stdlib jdk81.3.60-eap-25. Searched in the following locations: -...

How to make or where to take a kotlin cli compiler for the ARM platform? I wanna make an android app which could receive a kotlin text file from a user and then compile it and then show a result on the screen. Whether I can find somewhere a library for that purpose or may be build the compiler from sources for arm arm-x64 Please point me in the right direction.

OnChanged of MediatorLiveData not called if Transformatons not used I am following https://github.com/android/architecture-components-samples/tree/88747993139224a4bb6dbe985adf652d557de621/GithubBrowserSample for sample application. I can see that they have used NetworkBoundResource class to handle db operations and network operations. The problem I am facing now is MediatorLiveData onChanged...

Cannot load library "opencv_java4" in android Trying to get android to work with opencv but getting this error. attaching the error log and relevant codes. I have followed the opencv android tutorial for this to setup the project. Error (Console) This shows when called the function E/AndroidRuntime: FATAL EXCEPTION: main Process: com.logicaldp.fingerprintrecog, PID: 13300 java.lang.NullPointerException: Attempt to invoke virtual method 'int org.opencv.core.Mat.rows()' on a null object reference at...

Ignore irregular CSV file rows on Android I'm downloading a CSV file from a url and so far so good, the problem is that they have changed the format of the file a little bit and now the last row contains only text, so it only has one column, when normal is 7, so I get the following error: Fields num seems to be 7 on each row, but on 820th csv row, fields num is 1. Right now I just tried it and it works because they have already changed the excel file and they have added at the end of that row the necessary commas to make it work...

What can be shared through Kotlin Multiplatform between Android and iOS? Would someone describe explicitly what exactly can be shared through Kotlin Multiplatform between Android and iOS? For example, we have in Android: UI (xml) business logic (Kotlin). As per JetBrains, everything below UI (xml) can be shared. Does that mean also binding? I also heared 100% can be shared. How is it than done with UI? Thanks and best regards

How to create an ArrayAdapter for listView which is placed in bottomSheetDialog? Here is my btmSheet Class, and i want to create an adapter for my searchable ListView which is in BottomSheetDialog,but something wrong with my "regAdapter". Please help me to clear it up.

how to quit the app by using back button and show alert dialogue using kotlin in android I just made a search regarding my title but I used to get a Java code but not the kotlin's so I'm building project in kotlin so it would be beneficial Thank you

How I can modify a field of the variable object affected from mutable list without affecting the element of this list I have a MutableList containing an Object list retrieved via Realm (using copyFromRealm function). Later in my code, I assign an element of my array to a variable. var singleItem = myList.get(index) Later I decide to modify the name field of singleItem variable. My problem is the element of my list (myList[index]) is modified too. How I can modify the "name" field of the variable object without affecting the element of the list ? After some research, I understood that I had several...

How to change bottom sheet dialog behavior I have a modal BottomSheetDialog. Current and the default behavior of the dialog is, when I drag the dialog down by half, it dismisses. But the behavior that I want, is to drag the dialog a little bit down, e.g. 10px and it dismissed. How can I achieve this behavior, is there any way? Also, I think it would be great to allow the dialog only dismiss, when I drag e.g. drag button (most of cases it's a simple ImageView). I don't think that there is a need to show any code, but if you want I...

Display multiple values in a single Row using ListView and ArrayAdapter with Realm I have an app which draws value from the RealmObject and displays data on a ListView. I wanted to display five (5) values in a single line, however Realm does not support data classes. My ArrayAdapter: override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) Realm.init(activity) val realm = Realm.getDefaultInstance() val query = realm.where(CyePyaObject::class.java) val results = query.findAll() val...

Attempted duplicate class definition exception when inserting data class to MongoDB I'm doing some Spring Data document insertions in scheduled task, like this: val session = client.startSession() val template = MongoTemplate(client, db) val sessionBoundOps = template.withSession(session) session.startTransaction() sessionBoundOps.insert(obj); session.commitTransaction() Which leads to the following exception: Unexpected error occurred in scheduled task java.lang.RuntimeException: java.lang.IllegalStateException: org.springframework.cglib.core.CodeGenerationException:...

Dao with generic getById() function I'm trying to make a generic Dao interface that contains common methods, but I run into an issue when creating a getById(uid: I) method. For demonstration, I made the following example: data class Customer( @PrimaryKey(autoGenerate = true) var uid: Long? = null ) with an associated Dao @Dao interface CustomerDao : BaseDao { @Query("SELECT * FROM customers WHERE uid=:uid") override fun getById(uid: Long): Customer; } And BaseDao looks like this @Dao interface BaseDao {...

Loading YoutubePlayer into GroupieViewHolder (Recyclerview) Kotlin I am trying to load the YoutubePlayer into a GroupieViewHolder which I then load into a Recyclerview. I get the following error and struggle to solve the issue. Do you have suggestions for fixing it? Error android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class com.google.android.youtube.player.YouTubePlayerView Part of MainActivity.kt val adapter = GroupAdapter() recyclerview.adapter = adapter adapter.add(VideoContentRow("wKJ9KzGQq0w"))...

Spring Boot: Set hibernate sequence globally Currently I define the tables the following way: The example is in Kotlin, but you can answer in Java if you want. @Entity data class Task(@Id @GeneratedValue(strategy = GenerationType.SEQUENCE) var id: Int = 0, @ManyToOne(optional = false) @OnDelete(action = OnDeleteAction.CASCADE) var exercise: Exercise = Exercise(), @Column(nullable = false) var name: String = "") @Entity data class Exercise(@Id...

Webview or converting html to native - Which will be more efficient when rendering HTML content? I have blog site and i'm storing user posts as HTML, and now I'm making an app with kotlin for my site. I wanna display 10-20 posts on one page, yes i can create 10-20 webview and load the html but it won't be efficient i think. So this is the question, Creating webview for each post or converting HTML to native components? Which is the efficient one?

Android Kotlin Glide Image Loading: Decrypt Bytearray Image Response before loading with Glide into ImageView I am trying to load images from an existing API, the issue is that the API REST Response image response come as encrypted Bytearray and cannot be read if not decrypted prior to being loaded to the imageView. The flow is as follows: LoadImage(id) -> OutputByteArray -> DecryptAES() -> DecryptedByteArray -> assign decrypted bytearray/bitmap to imageView. I tried to look for tutorials and examples in Kotlin to do this step, but could not find any relevant sources(I am aware of ModelLoaders and...

How to solve sqlite_error I used an android studio and got a below message. but I'm don't Know..... what should I do? ***E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.mygallery, PID: 1315 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mygallery/com.example.mygallery.MainActivity}:** android.database.sqlite.SQLiteException: no such column: datetakenDESC (code 1 SQLITE_ERROR): ,

key name was changed when http post using spring reactive webclient Currently I am using kotlin and webclient to send some data. The data class is like Data class Record( val wId: String ) the request part is like, the type of body is the object defined above val record = Record("record1") WebClient.builder() .baseUrl("http://localhost:8081") .build() .contentType(MediaType.APPLICATION_JSON) .bodyValue(record) .retrieve() .awaitFirstOrNull() then, I used nc -l 8081 to listen to the port I found the...

Adding cards on top of each other in Android using XML I am trying to make an app which consists of three cards and the cards will be stacked on top of each other and come up when I open it as shown in Designs below. now when I click on team it should come up. I tried to add an OnClickListener on it but it also detects the touch from behind another card. Thanks for any answers in Advance

Adding data of a data class to a mutablelist that is a parameter of another data class Kotlin Androidx My addMeal function expects a restaurant/YelpRestaurant (that was previously selected by the user.. see images) How do I pass that selected restaurant in?? Hope this is very simple and I am overthinking it This is my first kotlin android project so apologies for stupidity. <a href="https://i.stack.imgur.com/gxpsE.png" rel="nofollow noreferrer">User decides to add a thought for that...

Parsing a jsonrray into object using moshi with Retrofit and Kotlin I am trying to parse using Moshi Library for JSON Array using Kotlin Coroutines . Code use fun retrofitIndia(baseUrl : String) : Retrofit = Retrofit.Builder() .client(clientIndia) .baseUrl(baseUrl) .addConverterFactory(MoshiConverterFactory.create()) .addCallAdapterFactory(CoroutineCallAdapterFactory()) .build() I get issue while Parsing the data class for JSON Array . I have used same for JSON Object and it works fine but during array , it...

CURL POST request in kotlin using Runtime.getRuntime.exec errors with data I'm building a plugin in intellij and want to make a curl request. The plugin is written in kotlin. The following curl request works: val comd = arrayOf( "curl", "-X", "GET", "-H", "Authorization: AUTH_TOKEN", "https://api.bitrise.io/v0.1/me" ) But the following POST request with data doesn't: val comd = arrayOf( "curl",...

How do I get missed classes from JaCoCo? I have a mixed Java/Kotlin project, and after a failed build the report says: Loading execution data file jacoco.exec Analyzed bundle 'xxx-api' with 884 classes [WARNING] Rule violated for bundle xxx-api: classes missed count is 36, but expected maximum is 35 This is my local build, and it fails in Jenkins too (with the same error), so I need to solve this locally (I mean, I can't change nothing about the environment nor the pom.xml), so I was wondering if there's a way to know what are...

How to crawl recursive structures using Kotlin coroutines? Given a tree like structure, and an operation to fetch the children of a node, e.g: typealias NodeReference = URL data class Node( val data:Data, val childrenList:List) suspend fun resolve(nodeRef:NodeReference) : Node Do you know a blueprint to implement a crawler function having the signature fun nodeList(rootNode:NodeReference) : List = runBlocking(...) { ... } returning all nodes of the tree using Kotlin coroutines?