Programmer Think

Author: Wang Chenyan preface When we are developing applications, we usually introduce SDKs, and most SDKs require us to initialize in the Application. When we introduce more and more SDKs, the Application will become longer and longer. If the initialization tasks of the SDK depend on each other, we have to deal with many condition judgment ...

0. Introduction Service Service doesn't have to be used for a long time. Isn't it a long servant? We can use JobIntentService -- temporary servant. It's good to live and die with your App! However, it's easy to start and there's no clue to shut down. Because the service runs in the background, it has nothing to do with the UI. If we use MVVM, ...

We often use generics in Android development, such as List, Map, Set, Adapter, etc. generics are also supported in Kotlin. What is generics? Generics: special types that postpone the type specific work until the object is created or the method is called. 1, Defining generic methods in Kotlin Defining generics in Kotlin is the same as Java in ...

What is a Lambda expression?Lambda expressions are actually anonymous functions. In fact, a function is a function. An anonymous function is an anonymous function code. In Kotlin, function also appears as a type. Although in the current version, the flexibility of function type is not as flexible as Python, it can also be assigned and passed, w ...

In the latest Android SDK, startActivityForResult has been marked as an outdated method, instead of using registerForActivityResult. 1. Why use registerForActivityResult? In the previous way of using startActivityForResult, you need to pass a requestCode. When the destination interface returns to this interface, you can use the requestCode to ...

1.Material design definition Material design is a new set of interface design language developed by google design engineers based on excellent design principles and combined with rich creativity and science and technology, including visual, sports, interactive special effects and other characteristics. 2. Use of toolbar Toolbar not only inhe ...

Kotlin grammar manual (I) When using kotlin, because the mastery is not reliable enough, it is still a habit of Java programming, which wastes the language features, convenience and indirectness provided by kotlin. When reading some Android open source libraries, it is difficult to read because many of them are written by kotlin syntax, and it ...

Class modifier Class modifiereffectfinalCannot be inherited from final classopenopen class that can be inheritedabstractabstract classenumEnumeration classdataData classsealedSealing classannotationAnnotation abstract class Use the abstract keyword to mark a class as abstract abstract class Abstract class name[(primary constructor )][:I ...

Let's start with an introduction video of WorkManger: Chinese official introduction video (mainly because the little sister looks good ~) Usage scenario WorkManager is applicable to the needs that tasks need to continue to be executed after the application exits (such as the application data reporting server). For those cases that task ...

As a means of generating code by annotation processor, kotlinpool generates Kotlin code in an object-oriented way, which is more in line with the design idea of designers than the write code line by line of EventBus 1. Basic syntax of kotlinpoet First write a piece of Kotlin code class testPoet{ companion object { private const val ...