kotlin training

Attribute delegation of Kotlin: Android assignment (KAD 15) and kotlinandroid without context By Antonio Leiva Time: Mar 9 and 2017 Link: https://antonioleiva.com/property-delegation-kotlin/ As we have read in the previous article, attributes require default values, and attributes cannot be declared without being assigned values. Because you want to store the view to the attribute, this creates a prob

Kotlin transmits variable length parameters to Java Variable Parameter instance code, kotlinjava This article mainly studies how Kotlin transfers variable length parameters to Java variable parameters. The specific implementation code is as follows. Defines Java Variable Parameter Methods Package com. tcl. john. studymvvm. utils;/*** call Java method tool class * Created by ZhangJun on. */public class Ca

Antonio LeivaTime:Jan,Original link:Https://antonioleiva.com/anko-background-kotlin-android/Anko is an Android library developed by JetBrains with Kotlin, which can be used in many different ways. Its main feature is the use of DSL code to create a view .While this may be interesting, the fact is that I have been using XML very well for a long time. So there's not much to try with this feature.In fact, it h

Kotlin built-in numeric typeNote: Numeric types in Kotlin cannot be implicitly convertedKotlin supports binary, decimal, hexadecimal, but octal is not supportedbinary var a = 0b0011_0011 (starting with 0b)decimal var b = 999Hex var c = 0x1a4f (starting with 0x)Kotlin to create a numeric type object: 1 fun Main (Args:array 2 var int : int= 1 3 var long : Long =

Using http://start.spring.io/to download the Project Run Unit Test report java.lang.ClassNotFoundException: Kotlin.reflect.KotlinReflectionInternalErrorReason isJackson-module-kotlin version references kotlin-reflect too low by defaultThere is no such kotlinreflectioninternalerror in the new kotlin-reflect.WorkaroundDeclare specific versions of Jackson-module-

Cloudopt Next is a Kotlin, vertx-oriented, next-generation, ultra-lightweight microservices framework that allows you to handle URL parsing, data encapsulation, JSON output, and more, radically reducing development time and improving the development experience. Cloudopt next absorbs the ideas of spring Boot, jfinal, Resty, VERTX and other outstanding projects, with a very good development experience and a very low learning curve.Cloudopt Next has the

When I woke up, I suddenly found out that Google has Kotlin as the first-level development language for Android, saying that it's going to be next to Java (but I always feel that Java is being discarded, mostly oracle things do sometimes ...). , Kotlin before really did not pay attention to, open IntelliJ idea, found in fact Kotlin module already had. So quickly

View all my open source projects "open Source Labs"Welcome to join my QQ group: "257053751", this blog client download "please click"SummaryIf you really want to learn more about the Kotlin language, you can view the English version of the Kotlin language document, or my Kotlin language document Chinese translation Project KOTLINDOC-CN:HTTPS://GITHUB.COM/KYMJS/KO

Antonio LeivaTime:Dec,Original link:https://antonioleiva.com/kotlin-integrations-android-sdk/Using the Kotlin language not only simplifies your code, but it also simplifies calling Java code from Kotlin.How does this work? Simply using some common structure can get a sense of kotlin.In this article, you'll see some examples of how to promote the same code. It also prevents the Java code from including the t

1. Define Package NameConventionally, the package definition places the top of the code source file Package Com.demo.hellokotlin Import java.util.* //... This is no different from the Java definition. 2. Definition methodThe first way to get started with Java is the main method, and Kotlin main is much simpler, using the keyword Fun Declaration, as follows: Fun Main (args:array Define a sum that returns two integers, you can see that the paramete

Basic Syntax 1. Define Package name As in Java, at the head of the file Package My.demo Import java.util.* 2. Definition Method Take the following method as an example: Fun sum (A:int, b:int): Int { return a + b } Methods start with the fun keyword, a:int, and B:int as the method parameter. After the parentheses: int is the return value. The Kotlin statement differs from Java in that it does not; End. The

These days have been preparing for the exam, really no time, has passed so long, finally to the object-oriented!Let's see what the Kotlin in the class look like.Can see Kotlin in the class is still very common, mostly similar to Java, the more special are:Each constructor must have an initial value assigned to each member variable.Primary constructor, the head of this constructor is immediately following th

Arc Menu 2 (animation fade-in +kotlin development)Preface: A curved menu based on Androidstudio, which is developed using the Kotlin language, and the animation is gradually entered ...Effect:Development environment: androidstudio2.2.1+gradle-2.14.1Knowledge Involved: 1. Custom controls, 2. Event distribution, etc.Part of the code:Activity:classhomepageactivity:appcompatactivity () {Privatevar homepagemenul

Keywords in kotlin that are consistent with Java usage include: override, while declarations · Open in Kotlin a class needs to be inherited by another class, you need to use the Open keyword Open Class Openclass {} · is judgment type Fun testis () { var a:any? = null; A = 3L if (A is int) { println (' A is int ') } else if (A is long) { println ('