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Characteristics of Unit function It is similar to void in java, but java is a key frame, not a type, which is very contradictoryUnit is not written. It also exists by default. Unit represents the ignored type returned without parameters package com.fyx.s1 fun main() { } fun convert() { } //Equivalent to the above fun convert1() : Unit{ ...

catalogue Features of functional programming Declarative function Lambda expression Higher order function case Features of functional programming Functional programming is essentially a collection of functions. For example, you want to filter odd numbers in a collection: fun testFunX(): Unit { val list = listOf(1,2,3,4,5,6,7) v ...

Recommended by Haowen: Author: Ricardo mjiang preface At the end of July this year, Google officially released the 1.0 stable version of Jetpack Compose, which shows that Google believes that Compose can be used in the production environment. I believe that the wide application of Compose is in the near future. Now should be a better time t ...

preface So far, the Gradle foundation and Kotlin foundation have been explained. Therefore, in this article, we will explain in detail the construction optimization of Gradle and how to migrate from Groovy to KTS! Don't say much, just start! 1. Gradle build optimization Optimization is all about configuration. Just go through it quickly! Fo ...

1, Lifecycle Lifecycle is a lifecycle aware component in Jetpack. It is used to store information about the lifecycle state of an Activity or Fragment, and allow other objects to observe this state. Lifecycle uses state and event enumerations to track the lifecycle state of its associated components. 2, Basic use   Using Lifecycle to o ...

1, How kotlin throws exceptionsException handling in Kotlin is similar to that in Java or other languages. A function can end normally or throw an exception when an error occurs. The function caller catches the exception and handles it; If not, the exception is thrown up the call stack again.The basic form of exception handling statements in Ko ...

Have you ever wanted to add new functions or properties to the API of a class? You can usually solve this problem by inheriting the class or creating a new function that takes an instance of the class as a parameter. Java programming language usually uses Utils class to solve such problems, but this method does not support automatic code com ...

Room It is the encapsulation of SQLite, which makes the operation of Android database very simple. It is also my favorite Jetpack library so far. In this article, I will tell you how to use and test the Room Kotlin API, and I will share its working principle during the introduction. We will be based on Room with a view codelab Explain it to ...

1, How kotlin throws exceptions Exception handling in Kotlin is similar to that in Java or other languages. A function can end normally or throw an exception when an error occurs. The function caller catches the exception and handles it; If not, the exception is thrown up the call stack again. The basic form of exception handling statements i ...

Full code Gitee address: Kotlin Demo: 15 day kotlin learning plan Day 5 learning content code: Chapter5 catalogue preface definition Application scenario Knowledge point 1: static registration broadcast Knowledge point 2: dynamic registration broadcast Knowledge point 3: Customize global broadcasting preface BroadcastReceiver is o ...