kotlin constructors

Kotlin Series 5 --- data class, seal class, internal class details, kotlin --- Summary: kotlin has been learning for a while. It takes a little time to look at it every day. It will take a long time to forget it. It is only necessary to sort it out again, in this article, we will sort out the basic usage of several categories, which are roughly the same as thing

1 Creating a new projectAndroid Studio creates a new project with only one empty mainactivity2 Installing KotlinFile-seeting-plugins-install jetbrains Plugin input Kotlin installation,If the installation fails, open the C:\Users\ user \. Androidstudio2.3\system\log\idea.log "This file, find KotlinHttp://plugins.jetbrains.com/pluginManager/?action=downloadid=org.jetbrains.kotlinbuild= ai-162.2228.14uuid=6b417889-78a8-4cc8-ac6c-3e8d64c5a56cDownload to d

Talking about Kotlin (III): Class, talking about kotlin Kotlin (1): Introduction and configuration in Android Studio Kotlin (2): basic types, basic syntax, and code style Talking about Kotlin (3): Class Preface: I have learned the first two articles and have a basic underst

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

**name, is actually called the auto -generated **setname () method, by the way, youYou can also customize the getter and setter methods of properties , do some filtering or some additional operations, such as: And then there's a pit, which is if you write get () = Trueheight, you keep calling yourself and then OOM.Someone on the net said to add a $ in front, but the measurement is not, if there is a solution must inform me.In addition, you can also add privateto the get and set methods before

Kotlin learning notes basic syntax, kotlin learning notesKotlin Study Notes (2)-basic syntax Kotlin learning notes Series Kotlin Study Notes (1)-Overview, learning curve, development tools, references 1. Basic syntax definition package The package declaration should be at the top of the source file: package hard.uistud

Kotlin series: function details, kotlin function details Summary: The Use and definition of functions in kotlin are more flexible and diverse. In addition, it supports different degrees of expansion to help developers create their own methods and improve development efficiency, here, we will briefly introduce the use of different functions. Extended functions wi

first, class definition The class is declared using the Generic keyword class in Kotlin, followed by the class name: Class Kotlinclass {// class name Kotlinclass //curly braces are the body composition } Interface Definition Interface Ikotlininterface Single Case Kotlin uses the object class to modify classes, you can implement a singleton mode,Java Singleton class: public class javainstanceclass{

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 s

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

Kotlin and kotlinThe main function of the basic function variable can be independent of the class static function.Class static function, you need to put the function into the braces of the companion object. class Static { companion object { fun add( a: Int, b:Int):Int = ( a + b ) }}fun main(args: Array ) { Static.add(1,2);} String Template fun main(args: Array ) { println("Hello, ${if (args.size >

, the heart will be afraid. For example, the description list of the six major planets shown, the icon on the left, the text description on the right, and a very common page.But this planet list page, if you use Java encoding, you have to write the following long length of code:public class Planetjavaadapter extends Baseadapter {private Context mcontext; Private arraylist The above Java implementation of the adapter class Planetjavaadapter, it is really lengthy and obscure, however, this code

Kotlin parameter confusions, kotlin ParameterThe literal function is enclosed in braces and the parameter is declared before (the parameter type can be omitted). The function body is after->. Parameter (T)-> R /*** Map function maps a value to another value * map accepts a function, which has a parameter T */inline fun Array . Map (transform :( T)-> R): List {Return mapTo (ArrayList (Si

Kotlin entry-coroutine internal mechanism, kotlin entry coroutineSuspension Function ?? A new type of function that appears after the coroutine is exposed. A function modified with a special modifier suspend is called a suspension function. A suspended function can only be called in the coroutine and other suspended functions. It cannot be used in other functions. To start a coroutine, it is necessary to su

Just ended the Google IO Conference really dry, as programmers most let me just interested in or Google announced that Kotlin become the first development language AndroidThis is indeed a more shocking news, as the mobile development of me, is bound to grasp the development of the language in time.Personally read Kotlin's Chinese document, feel its grammar and swift very similar (in the end who copied who ~), so if you have the effect of swift develop

Idea Chinese Input method's smart cue box does not follow the cursor problem I use the development tool is ideas this version of ideas has a problem; the Chinese input method of the smart box does not follow the cursor to solve the problem is very simple, only in the installation directory to change the JRE folder name, or just delete it. After doing so, idea will automatically use your system's JRE environment my system is jdk1.8.0_131; If you don't set your environment variable, you can now se

Issue 1: Create a new Android project that supports Kotlin, stuck in "Resolve Dependency:classpath"Solution Analysis:Generally encountered "Resolve Dependency:classpath" stuck motionless, and so on if still did not respond, should be never response. Restart Android Studio or Gradle sync again, and if not, look at the gradle version of "Gradle-wrapper.properties" in the project and go to the system. Gradle The directory below to see if the correspondin

Google Daniel said: Why Kotlin than you use the rubbish language is goodOriginal title: Google Daniel said: Why Kotlin than you use the rubbish language is good Compilation: Bole Online/Huang "Bole Online/Programmer's Things Guide": May 18, the Android team at the Google I/O 2017 conference announced that Kotlin became the official first-class suppo

. However, we may encounter problems when creating custom views by inheriting common views. Custom views need to rewrite one or more constructors to work properly, but we can't do that. Fortunately, the automatic Kotlin M11 begins, and we can declare multiple constructors, similar to Java. The following is a square ImageView:classSquareimageview:imageview{public

Google IO 2017 announced that Kotlin will become the official Android language. A time friends Circle and Android Circle are all kinds of brush screen. Of course, I also take advantage of the release of an article "Why I want to use Kotlin", really fiercely rubbed a wave of heat (although this will be despised). Now that the Android circle is agitated, even if it turns a blind eye to