kotlin training

Kotlin is integrated with the Android SDK (KAD 05) and kotlinandroid By Antonio Leiva Time: Dec 19,201 6 Link: https://antonioleiva.com/kotlin-integrations-android-sdk/ Using the Kotlin language not only simplifies your code, but also simplifies calling Java code from Kotlin. How does this work? Using some common st

Use Kotlin to perform function operations on ViewGroup views. Original article title: Functional operations over Views in ViewGroup using Kotlin Link: http://antonioleiva.com/functional-operations-viewgroup-kotlin/ Antonio Leiva (http://antonioleiva.com/about) Original article published: Set, iteration, array, sequence... all these share a set of usefulFunctio

Function-based Android programming (II): Set Operations in the Kotlin language, androidkotlin Original article title: Functional Android (II): Collection operations in Kotlin Link: http://antonioleiva.com/collection-operations-kotlin/ Antonio Leiva (http://antonioleiva.com/about) Original article published: Lambda expressions are an outstanding tool to simplify

In Java, you can use {} to create an anonymous block of code, and the code block will be executed normally, and it doesn't seem to have any effect other than changing the scope. But it is not possible to do so in Kotlin.In fact, we all know that a function must be associated with a memory address, and an anonymous block of code is actually an anonymous function. In Kotlin, you typically use the run function to run an anonymous block of code.As follows

Kotlin Native, kotlinnative Kotlin Native is not a concept of Jni. It does not only need to interact with underlying Code such as C and C ++, but also needs to bypass the Jvm to directly compile the machine code for the system to run. That is to say, Kotlin is about to discard the Java crutches! In fact, when I first saw the Native name, I naturally thought of

Who said the interface cannot have code? -- Kotlin interface introduction (KAD 26), kotlinkad By Antonio Leiva Time: Jun 6, 2017 Link: https://antonioleiva.com/interfaces-kotlin/ Compared with Java, the Kotlin interface allows you to reuse more code. The reason is very simple:You can add code to your interface. If you have tried Java 8, this is very similar.

The Reified type of Kotlin: how to use this type (KAD 14) in the function, kotlinreified By Antonio Leiva Time: Mar 2 and 2017 Link: https://antonioleiva.com/reified-types-kotlin/ One of the most annoying restrictions for Java developers is that they cannot directly use types when using generics. The common solution is to pass classes in the form of function parameters, which makes the code more complex

optional when the return type can be inferred by the compiler.fun double(x:Int)=x*2Explicitly specifying the return typeWhen a function has a block of code, it must explicitly indicate the return type, which is not explicitly specified if it is returned to the unit. Kotlin cannot infer the return type when the function has a block of code, because there is a complex flow of control in the code, and the return type is not intuitive to the reader.Non-q

Kotlin is a new JVM-based language that can be seen as the extended language of Java, developed by JetBrains, who first saw him in the company's Android team when they saw them using the Kotlin to develop Android, suddenly feeling curious, and then slowly studied the prophecy.Why to develop and use the Kotlin language, the official saying is:Concise safeversatile

For Loop The For loop can traverse any object that provides an iterator (iterator), with the following syntax: Fun Main (args:array The loop body can be a block of code: Fun Main (args:array } As mentioned above, for can iterate through any object that provides an iterator.If you want to traverse an array or a list through an index , you can do this:Indices Fun Main (args:array Note that this "traverse over Interval" is compiled into an optimized implementation without creating additio

Article DirectoryScene"For" loopIteration MapSummary Scenario What is the difference between the "for" loop and the iteration map in Kotlin and the one we know in Java, and what are the better representations? "for" Loop Kotlin "for" Loop structure: for (I in a.. bA represents the starting value, and B represents the end value ... Represents the interval. For example (i in 1..100)Note: The interval is inclu

No matter the function or the method we collectively refer to the function here, the function in Koltin is much richer than that in Java, we have this article to understand the various functions in Kotlin. Inline Functions Android Development, printing information in general we will use the log class, log each method we have to pass two parameters, the first tag parameter in the Kotlin we can be encapsulate

How does a Lambda expression work in Kotlin: setOnClickListener conversion (KAD 18), 180 By Antonio Leiva Time: Mar 28,201 7 Link: https://antonioleiva.com/lambdas-kotlin-android/ Although I have mentioned a little about Lambda expressions in other articles, I would like to explain in depth how Lambda expressions work in Kotlin, and when we use the Java librar

How to Use Mockito2 mock final class (KAD 23) and kotlinmockito2 on Kotlin By Antonio Leiva Time: Mar 2 and 2017 Link: https://antonioleiva.com/mockito-2-kotlin/ As mentioned in the previous article, one of the most common problems with Kotlin is that by default, all classes and functions are disabled. That is to say, if you want a mock class (which may be ve

Get to know the Swift on the Android platform of Kotlin. The Kotlin syntax is concise and has the characteristics of a series of dynamic languages, Lambda expressions, high-order functions, closures, and even type checks for static languages. The core point is to write the same function, kotlin requires a lot less code. The following is a JAVA data class public c

After the Spring Festival, the new "opening". Please continue to support the master. Thank you!Original title: Kotlin Recipes for Android (I): OngloballayoutlistenerOriginal link:http://antonioleiva.com/kotlin-ongloballayoutlistener/Original Antonio Leiva (http://antonioleiva.com/about/)Published in the original: 2016-03-16Kotlin Secret recipe for Android (I): OngloballayoutlistenerToday, a companion asked

A recently used jar package uses the static method of the interface in the JAVA8.This will add a bit of configuration to the Gradle build file when compiling. Common Java Engineering in the Build.gradle to add the following configuration:compileoptions {sourcecompatibility javaversion.version_1_8 targetcompatibility JavaVersion.VERSION_1_8 }so the new features of JAVA8 can be compiled normally, but the above configuration is only for Java code compilation, K