kotlin

Plugin “Android Bundle Support” is incompatible

由 感情迁移 提交于 2020-12-13 03:10:36
问题 everyone, I have a very weird error when i launch android studio since last update. I have this error: Plugin Error: Plugin "Android Bundle Support" is incompatible (until build AI-195.SNAPSHOT < AI-201.8743.12). I can't find any info online about it. When i paste on google just like i did here. No results are found. Could you please tell how i could fix it ? Sorry about not giving anymore details but there is very few info online. Thank you so much in advance ;) 回答1: Android Support plugins

IntelliJ displays error message when unit test is written in Kotlin

由 纵饮孤独 提交于 2020-12-13 03:05:34
问题 Context I have a project with following traits IntelliJ Ultimate 2020.1 Java 13 (with module-info.java) Kotlin 1.3.72 JUnit (+ truth) maven (I believe this to be unimportant) The code base is mixed, some classes are written using plain Java, others with Kotlin, the same is true for tests. Everything works as expected, that is all code is compiled in proper order and fully interoperable between Kotlin and Java all test can be executed using either mvn test or IntelliJ "Run Test" the resulting

Increase value in mutable map

由 假如想象 提交于 2020-12-12 11:41:07
问题 I created a mutableMap<String, Int> and created a record "Example" to 0 . How can I increase value, f.e. to 0 + 3 ? 回答1: You could use the getOrDefault function to get the old value or 0, add the new value and assign it back to the map. val map = mutableMapOf<String,Int>() map["Example"] = map.getOrDefault("Example", 0) + 3 Or use the merge function from the standard Map interface. val map = mutableMapOf<String,Int>() map.merge("Example", 3) { old, value -> old + value } Or more compact: map

Understanding the need for Kotlin let

由 巧了我就是萌 提交于 2020-12-12 11:37:26
问题 I'm trying to understand why let is needed. In the example below I have a class Test with a function giveMeFive: public class Test() { fun giveMeFive(): Int { return 5 } } Given the following code: var test: Test? = Test() var x: Int? = test?.giveMeFive() test = null x = test?.giveMeFive() x = test?.let {it.giveMeFive()} x gets set to 5, then after test is set to null, calling either of the following statements return null for x. Given that calling a method on a null reference skips the call

Kotlin lateinit not working with @Inject annotation

由 社会主义新天地 提交于 2020-12-12 10:53:31
问题 I am new to dagger 2 and kotlin both. Getting lateinit property not initialized. I have a module which have few @Provides methods but one of the class not able to create object which used @Inject and lateinit. Login service takes "LoginAPI" as parameter and works fine but as i want all my login related API's to use the same service. There is one more API related "LoginWithOrgAPI" . Now my need is to get any API object when needed in the LoginService class. So i tries using lateinit with

Kotlin 环境安装及语法教程

由 血红的双手。 提交于 2020-12-12 08:03:02
目录 Kotlin 教程 我的第一个 Kotlin 程序 最简版 面向对象 为什么选择 Kotlin？ 参考链接 Kotlin 教程 Kotlin 是一种在 Java 虚拟机上运行的静态类型编程语言，被称之为 Android 世界的Swift，由 JetBrains 设计开发并开源。 Kotlin 可以编译成Java字节码，也可以编译成 JavaScript，方便在没有 JVM 的设备上运行。 在Google I/O 2017中，Google 宣布 Kotlin 成为 Android 官方开发语言。 Kotlin 教程 Kotlin IntelliJ IDEA 环境搭建 Kotlin Eclipse 环境搭建 Kotlin 使用命令行编译 Kotlin Android 环境搭建 Kotlin 基础语法 Kotlin 基本数据类型 Kotlin 条件控制 Kotlin 循环控制 Kotlin 类和对象 Kotlin 继承 Kotlin 接口 Kotlin 扩展 Kotlin 数据类与密封类 Kotlin 泛型 Kotlin 枚举类 Kotlin 对象表达式/声明 kotlin 委托 我的第一个 Kotlin 程序 Kotlin 程序文件以 .kt 结尾，如：hello.kt 、app.kt。 最简版 package hello // 可选的包头 fun main(args:

How to emit data from an asycnhronous callback using Kotlin Flow?

由 天大地大妈咪最大 提交于 2020-12-12 06:00:50
问题 I'm starting to learn Kotlin Flow and Coroutines but I do not know how to make the code below works. What am I doing wrong? interface MessagesListener { fun onNewMessageReceived(message: String) } fun messages(): Flow<String> = flow { val messagesListener = object : MessagesListener { override fun onNewMessageReceived(message: String) { // The line below generates the error 'Suspension functions can be called only within coroutine body' emit(message) } } val messagesPublisher =

How to emit data from an asycnhronous callback using Kotlin Flow?

由 我的梦境 提交于 2020-12-12 05:56:28
问题 I'm starting to learn Kotlin Flow and Coroutines but I do not know how to make the code below works. What am I doing wrong? interface MessagesListener { fun onNewMessageReceived(message: String) } fun messages(): Flow<String> = flow { val messagesListener = object : MessagesListener { override fun onNewMessageReceived(message: String) { // The line below generates the error 'Suspension functions can be called only within coroutine body' emit(message) } } val messagesPublisher =

How to emit data from an asycnhronous callback using Kotlin Flow?

由 筅森魡賤 提交于 2020-12-12 05:55:26
问题 I'm starting to learn Kotlin Flow and Coroutines but I do not know how to make the code below works. What am I doing wrong? interface MessagesListener { fun onNewMessageReceived(message: String) } fun messages(): Flow<String> = flow { val messagesListener = object : MessagesListener { override fun onNewMessageReceived(message: String) { // The line below generates the error 'Suspension functions can be called only within coroutine body' emit(message) } } val messagesPublisher =

Split list when predicate is true

由 亡梦爱人 提交于 2020-12-12 05:40:48
问题 Does Kotlin provide a mutation function to split a list when a specific predicate is true? In the following example the list should be split when the element is a . . The result should be of the type List<List<String>> . // input list val list = listOf( "This is", "the", "first sentence", ".", "And", "now there is", "a second", "one", ".", "Nice", "." ) // the following should be the result of the transformation listOf( listOf("This is", "the", "first sentence"), listOf("And", "now there is",
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