kotlin guide

Use Kotlin to implement custom Android views (KAD 06) and kotlinandroid By Antonio Leiva Time: Dec 27,201 6 Link: https://antonioleiva.com/custom-views-android-kotlin/ When reading articles about class, you may remember to use only one constructor. This is a problem for creating custom views. The Android framework wants multiple constructors to correspond to different view creation locations and view cr

(new) Kotlin get up--4. Classes and Objects This article declares :This article is written by Coder-pig , want to know other content, visible "coder-pig pigsty "Respect the work of the author, without my authorization, prohibit reprint. Reserved"Kotlin Get Up" series Directory Address: http://blog.csdn.net/coder_pig/article/details/72851862 1.Any class We all know that every class in Java has a default pa

Kotlin has been the official language of Google for more than a year, but in addition to announcing the extreme popularity of that month, the back of life has returned to calm. Many small partners follow the pace of Google's father, but also to Kotlin have a more or less understanding, GitHub also has a considerable part of the Kotlin open source projects. But pe

Activity page Jump is one of the most commonly used features of the app, in the previous chapters of the demo source has been seen many times, often click on a button on the interface, and then jump to the corresponding next page. For app developers, the implementation of this feature is very common, using Java encoding but the following two lines of code: Intent Intent = new Intent (mainactivity.this, linearlayoutactivity.class); StartActivity (Intent);The key to the above code is the int

Kotlin Programming related knowledge points : Kotlin programming using IntelliJ IED and understanding Source files (. kt) Kotlin programming and other properties Kotlin programming methods such as using Kotlin programming Kotlin p

Classes and Inheritance class Declaring a class using the keyword class in Kotlin Class Invoice { } A class declaration consists of a class name, a class header (specifying its type parameter, a main constructor, and so on) and a class body surrounded by curly braces. Both the class head and the class body are optional, and if a class does not have a class body, the curly braces can be omitted. Class Empty constructor Function A class in

Developing Android Apps with Kotlin (IV): Custom views and Android extensions @author ASCE1885 's Github book Weibo CSDNOriginal link After reading the extension function and the default value of this article, then what to introduce next? As we said in the first article in this series, Kotlin makes Android easier to develop, and we'll cover it further in this article.Custom ViewAs you recall,

Kotlin Learning Series: Use Cases of object keywords, kotlinobject Object is an important keyword in Kotlin and is not in Java. Objects can be used in the following scenarios: Object Declaration(Object Declaration) Companion object(Companion Object) Object expression(Object Expression) The following describes the meanings, usage, and notes of these keywords, so that you can fully understand the usage of

Kotlin Native introduces Objective-C interoperability and WebAssembly support According to JetBrains Technical Director Nikolay Igotti, Kotlin/Native 0.4 can be used to develop Native applications for iOS and macOS. This version also provides experimental support for the WebAssembly platform. Kotlin/Native supports iOS/macOS development. The key lies in implement

Antonio LeivaTime:Dec,Original link:https://antonioleiva.com/custom-views-android-kotlin/As we read about class articles, you may remember that typically only one constructor is used. This is an issue for creating custom views.The Android framework wants to have multiple constructors that correspond to different create view locations and create view methods (through code, using XML, setting up themes, and so on) so that we cannot ignore this situation

Directory Introductory video tutorials for Kotlin minimalist tutorials Kotlin System entry to advanced Kotlin from getting started to abandoning Kotlin from zero to Advanced 1th Chapter Kotlin Introduction 2nd Chapter Quick Start: HelloWorld 2nd Chapter Quick Start: Springbo

Kotlin is younger than Java, but it is a very promising programming language and its community is growing. Everyone is talking about it and saying it's cool. But why so special.We have prepared a series of articles to share our experience in developing Android applications in Kotlin. We'll discuss the differences between Kotlin and Java in terms of syntax, usabil

Kotlin as a newly-born language, incorporates many language features. Here's how to install the Kotlin plugin in eclipse to write the Kotlin programopen Eclipse(eclipse requires Neon 4.6. Version or higher). The author uses version 4.6.1. Choose Help--- Eclipse Marketplace ...650) this.width=650; "src=" Https://s5.51cto.com/wyfs02/M01/98/BC/wKioL1k_02vQ4f9NAAA8

Kotlin Programming related knowledge points : Kotlin programming using IntelliJ IED and understanding Source files (. kt) Kotlin programming and other properties Kotlin programming methods such as using Kotlin programming Kotlin p

Getting Started Guide basic syntax definition packageThe declaration of the package must be at the top of the source file:Package My.demoImport java.util.*Java different packages do not have to match the directory structure: the source files can be placed anywhere on the file system.function definitionHere is an example of a parameter with two int types and an int return value:Fun sum (A:int, b:int): Int {Return a + b}Using an expression as a function

Goodbye NullPointerException. Processing of null in Kotlin (KAD 19), kotlinnull By Antonio Leiva Time: Apr 4, 2017 Link: https://antonioleiva.com/nullity-kotlin/ One of the most important parts of Kotlin: It took me a long time to write an article. The creator of Tony Hoare's "null" concept,Billions of errors". When writing Java code, null is the most error-p

When you introduce the basic types in the official documentation for Kotlin, we are told that in some cases the base type is automatically boxed. However, the details of how to do the boxing, and when to do not provide a detailed description. Just provide an example, as follows: Val a:int = 10000 print (a = = = a)//prints ' true ' val boxeda:int? = a val anotherboxeda:int? = a print ( Boxeda = = Anotherboxeda)//!!! Prints ' false '!!!1 2 3 4 5 For the

Kotlin Programming related knowledge points : Kotlin programming using IntelliJ IED and understanding Source files (. kt) Kotlin programming and other properties Kotlin programming methods such as using Kotlin programming Kotlin p

Data Class The data class is a special class in Kotlin, and its particularity is shown in the following aspects: The primary constructor of the data class requires at least one parameter; All parameters of the main constructor must be decorated with Val or var; The data class cannot be abstract, open, sealed, or internal, meaning that the data class can only be final; Before Kotlin 1.1, the data class coul

Android app development with Kotlin (III): extended functions and default values, kotlinandroid This is the third article about Kotlin. Original article title: Kotlin for Android (III): Extension functions and default values Link: http://antonioleiva.com/kotlin-android-extension-functions/ Antonio Leiva (http://antoni