kotlin

问题 I currently have a gRPC server which is sending chunks of a video file. My android application written in Kotlin uses coroutines for UI updates (on Dispatchers.MAIN) and for handling a unidirectional stream of chunks (on Dispatchers.IO). Like the following: GlobalScope.launch(Dispatchers.Main) { viewModel.downloadUpdated().accept(DOWNLOAD_STATE.DOWNLOADING) // MAKE PROGRESS BAR VISIBLE GlobalScope.launch(Dispatchers.IO) { stub.downloadVideo(request).forEach { file.appendBytes( it.data

问题 I currently have a gRPC server which is sending chunks of a video file. My android application written in Kotlin uses coroutines for UI updates (on Dispatchers.MAIN) and for handling a unidirectional stream of chunks (on Dispatchers.IO). Like the following: GlobalScope.launch(Dispatchers.Main) { viewModel.downloadUpdated().accept(DOWNLOAD_STATE.DOWNLOADING) // MAKE PROGRESS BAR VISIBLE GlobalScope.launch(Dispatchers.IO) { stub.downloadVideo(request).forEach { file.appendBytes( it.data

问题 So, I am using Koin for dependency injection, Here is what I did inside a activity class ModuleDetailActivity : AppCompatActivity() { private lateinit var moduleId:String private lateinit var levelModule:Level.Module private val moduleViewModel: ModuleViewModel by viewModel { parameterOf(moduleId, levelModule) } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) ... ... moduleId = intent.getString("module_id") levelModule = intent.getParcelable("level

问题 I have spring-data-mogodb application on java or kotlin, and need create text search request to mongodb by spring template. In mongo shell it look like that: db.stores.find( { $text: { $search: "java coffee shop" } }, { score: { $meta: "textScore" } } ).sort( { score: { $meta: "textScore" } } ) I already tried to do something but it is not exactly what i need: @override fun getSearchedFiles(searchQuery: String, pageNumber: Long, pageSize: Long, direction: Sort.Direction, sortColumn: String):

问题 I have spring-data-mogodb application on java or kotlin, and need create text search request to mongodb by spring template. In mongo shell it look like that: db.stores.find( { $text: { $search: "java coffee shop" } }, { score: { $meta: "textScore" } } ).sort( { score: { $meta: "textScore" } } ) I already tried to do something but it is not exactly what i need: @override fun getSearchedFiles(searchQuery: String, pageNumber: Long, pageSize: Long, direction: Sort.Direction, sortColumn: String):

问题 I have multi module kotlin gradle project in github here. One of my sub project introducing-coroutines with build file build.gradle.kts file is here The contents of build.gradle.kts is - import org.jetbrains.kotlin.gradle.dsl.Coroutines import org.jetbrains.kotlin.gradle.tasks.KotlinCompile plugins { java kotlin("jvm") version "1.3.11" } group = "chapter2" version = "1.0-SNAPSHOT" repositories { mavenCentral() } dependencies { compile(kotlin("stdlib-jdk8")) compile("org.jetbrains.kotlinx

问题 I have multi module kotlin gradle project in github here. One of my sub project introducing-coroutines with build file build.gradle.kts file is here The contents of build.gradle.kts is - import org.jetbrains.kotlin.gradle.dsl.Coroutines import org.jetbrains.kotlin.gradle.tasks.KotlinCompile plugins { java kotlin("jvm") version "1.3.11" } group = "chapter2" version = "1.0-SNAPSHOT" repositories { mavenCentral() } dependencies { compile(kotlin("stdlib-jdk8")) compile("org.jetbrains.kotlinx

问题 In a let block, I sometimes see ^let annotations before my statements, and it's not clear to me what they mean or why they are there. Is it to indicate that a value will be returned as the value of the let call? Screenshot: 回答1: These do in fact show you that those values are going to be returned from the let expression. If you move to cursor to one of these hints and open intention actions (Alt + Enter), you get the option "Do not show lambda return expression hints ", which I suppose is the

问题 We're converting a lot of java static methods to kotlin extension functions. However, there are some methods that we need to keep around JUST FOR JAVA (We want to force kotlin code to use the extension functions). Is there a way to hide java static methods from kotlin? 回答1: You can annotate those methods with a @Deprecated annotation with deprecation level HIDDEN: @kotlin.Deprecated(message = "JUST FOR JAVA", level = DeprecationLevel.HIDDEN) public void foo() { } 回答2: There is a solution. It

问题 In Kotlin (and Java 8) we can use Lambda expression to remove boilerplate callback interface. For example, data class Profile(val name: String) interface ProfileCallback { fun onSuccess(profile: Profile) } class ProfileRepository(val callback: ProfileCallback) { fun getProfile() { // do calculation callback.onSuccess(Profile("name")) } } We can change remove ProfileCallback and change it into Kotlin's Lambda: class ProfileRepository(val callback: (Profile) -> Unit) { fun getProfile() { // do