Java -class library technical guidelines for learning the HILT Android framework

Learn the JAVA class library technical guidelines for the HILT Android framework Overview HILT is a dependent injection framework developed by Google for Android applications.It is based on Dagger's dependency of injection framework, and provides developers with a simple and powerful way to manage the dependency relationship in Android applications.This guide will introduce the technical principles of the Hilt Android framework to help developers better understand the working principle of the framework. Dependence Before understanding the Hilt Android framework, let's first understand the concept of dependence in injection.Dependent injection is a design model. By decomposing the dependency relationship between the object and the dependent relationship between the object, it is easier for applications to develop and test.The dependency injection allows us to meet the dependencies of the object through the method of injecting the object, without the need to explicitly create these dependencies. Principle of HILT framework HILT is built on the Dagger framework, which provides more simple and easy -to -use dependency injection methods for Android development.Below is several core principles of the Hilt Android framework: 1. Note processor: HILT uses an annotation processor to analyze and process classes, methods and fields with specific annotations.The annotation processor is responsible for generating the code required to generate the dependency relationship. 2. Components: HILT organizes the dependency relationship in the application as the component.Component is part of the object diagram, which is used for instantiation and management dependencies.The HILT framework automatically generates some predetermined components, such as ApplicationComponent, ActivityComponent, etc. 3. Scope: HILT uses the scope to control the life cycle of the object.The scope of action can specify the life cycle of dependencies and ensure that only one instance is created within the scope of the scope.HILT provides some default scope, such as Singleton, ActivityScoped, and FragmentsCoped, which can also customize the scope of action. 4. Binding: HILT uses binding to mappore dependencies types and their providers.Binding indicates how HILT creates and provides dependent items.HILT uses the `@inject` annotation to mark the constructor, field, or method that needs to be relying on the injecting constructor, field. For example code Below is a simple example code that demonstrates how to use dependency injection in HILT: // Create dependencies class UserRepository { // ... } // Use the annotation marker dependency injection point class UserProfileActivity extends AppCompatActivity { @Inject UserRepository userRepository; // ... } In the above example, the `UserRePOSITORY` class is a dependent relationship. We marked the dependency injection point of the object of the` userRePOSITOSITOSITOSITOSITOSITOSITOSITOSITORY.When the `UserProfileActivity` class is created, HILT will automatically create and provide us with instances of` UserRePOSITORY`. in conclusion The Hilt Android framework uses the principle of dependence injection, providing Android developers with a simple, flexible and easy -to -use way to manage the dependency relationship in the application.By understanding the technical principles of the Hilt Android framework, developers can develop and maintain their applications more efficiently.