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Recent questions tagged Kotlin

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kotlin - How to log request and response bodies in Spring WebFlux

I want to have centralised logging for requests and responses in my REST API on Spring WebFlux with Kotlin. So far ... What don't I understand? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - How to check if a "lateinit" variable has been initialized?

I wonder if there is a way to check if a lateinit variable has been initialized. For example: class Foo() { ... 't know whether myFile has been initialized } } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Jooq fetchInto with default value if field is null

I have data class data class Author( val id: String, val name: String, val books: MutableList<Book> = ... making field books in data class Author nullable? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Opening Android Settings programmatically

How can I open settings programmatically? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Smart cast to 'Type' is impossible, because 'variable' is a mutable property that could have been changed by this time

And the Kotlin newbie asks, "why won't the following code compile?": var left: Node? = null fun show() { ... casted to that type? How can I fix this elegantly? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Android TelephonyManager requestCellInfoUpdate returning stale data on API 29

I've been encountering a problem for some time using Android's TelephonyManager. We use the ... android-telephonymanager-requestcellinfoupdate-returning-stale-data-on-api-29...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Kafka, Avro and Schema Registry

I have a Kafka consumer configured with schema polling from the topic, what I would like to do, is create ... ://stackoverflow.com/questions/65834168/kafka-avro-and-schema-registry...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Java ObjectOutputStream/ObjectInputStream

I'm trying to implement Serializable interface for my class and I have a field in it that ... https://stackoverflow.com/questions/65836861/java-objectoutputstream-objectinputstream...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Dynamic Navigation drawer item in Navigation component architecture Android

I an unable to figure out any possible solution to load drawer items dynamically i.e hide and show ... /dynamic-navigation-drawer-item-in-navigation-component-architecture-android...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - getString("android.text") returns SpannableString instead of String

I'm trying to get notification content using: val sender = sbn.notification.extras.getString("android ... /65841242/getstringandroid-text-returns-spannablestring-instead-of-string...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - How to share a proto definition file between an android module and a non-android module (without using another module)?

Suppose we have a project in Android Studio (4.1) which is composed of two modules, an android app module and ... -proto-definition-file-between-an-android-module-and-a-non-android...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Using SpEL as annotation value

It's my annotation class: @Target(AnnotationTarget.FUNCTION) @Retention(AnnotationRetention.RUNTIME) annotation class ... com/questions/65842885/using-spel-as-annotation-value...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Android/JVM SQLite database

I'm trying to have a small Android app have its own database, my first take on this was to simply ... from:https://stackoverflow.com/questions/65844081/android-jvm-sqlite-database...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Micronaut-data with hibernate: Aborted transaction still modifies database

I currently encounter issues trying to get micronaut-data to work with transactions. To the best of ... /micronaut-data-with-hibernate-aborted-transaction-still-modifies-database...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - A simple Java HTTP server fails with ApacheBench but works fine on a browser

As part of a concurrency blog series, I was building the simplest HTTP server in different languages (Java, Kotlin, ... -server-fails-with-apachebench-but-works-fine-on-a-browser...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Unnecessarily mark functions as suspending in favor of common abstraction

I'm working on a project with an API running in the JVM and a JS client to access this API ... 65852794/unnecessarily-mark-functions-as-suspending-in-favor-of-common-abstraction...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Android image compression - Zelory Compressor doesn't upload image with special character on file path

I'm using Zelory Compressor to compress an image before uploading it to the server. It works, unless ... -image-compression-zelory-compressor-doesnt-upload-image-with-special...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Android Unit testing dataStore

I'm trying to write a test for my view model that gets the data from datastore but I can't ... from:https://stackoverflow.com/questions/65856930/android-unit-testing-datastore...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Getting duplicate BLE notifications on Android

I'm developing a frame exchange sequence between an nRF52840 and an Android smartphone using the BLE ... com/questions/65858118/getting-duplicate-ble-notifications-on-android...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - How do i create a function that adds already drawn blocks to a list?

currently i have an uni project which involves on building a simpler version of the game arkanoid (ball that reflects ... -a-function-that-adds-already-drawn-blocks-to-a-list...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Using a KClass reference as a reified parameter to deserialize from JSON

I'm trying to implement a general serialization framework to convert outgoing and incoming messages to json using the ... -reference-as-a-reified-parameter-to-deserialize-from-json...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.0k views

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kotlin - Google Map inside BottomSheetDialogFragment using SupportMapFragment

I'am trying to implement a google map inside a BottomSheetDialogFragment() and this code ... questions/65860995/google-map-inside-bottomsheetdialogfragment-using-supportmapfragment...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - How can I access header in a service?

I'm trying to handle JWT-authentication in gRPC on my backend. I can extract the JWT in an interceptor but how ... .com/questions/65861235/how-can-i-access-header-in-a-service...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Retrieving object from Room Database

I have two tables in my Room DB - Events and Notes. I an trying to retrieve the Note object ... https://stackoverflow.com/questions/65862428/retrieving-object-from-room-database...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Observing MediatorLiveData Issue

I have the following LiveData variables in my ViewModel (simplified example): val currentUser : ... ://stackoverflow.com/questions/65862724/observing-mediatorlivedata-issue...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Can't get access to Views by DataBinding or Android Extensions

I can't change value of Views by DataBinding or by Android Extensions, but it works by 'traditional way' ... 65863480/cant-get-access-to-views-by-databinding-or-android-extensions...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Class with functions that extends more than one implementation of the same data structure. Can be done?

I'm studying Data Structures in my CS course. University professor assigned us a project where we have to implement ... -that-extends-more-than-one-implementation-of-the-same-data...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kotlin - Visual Studio Code + Java - doesn't find my dependencies from build.gradle.kts

Visual Studio Code doesn't resolve dependencies declared in my build.gradle.kts file in this test project. Can you ... -code-java-doesnt-find-my-dependencies-from-build-gradle-kts...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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