In-depth analysis of the technical principles of Hilt Android framework in the Java class library (In-Depth Analysis of the Technical Principles of Hilt Android Framework in Java Class Libraries))

In -depth analysis of the technical principles of Hilt Android framework in the Java class library HILT is a dependent injection framework developed by Google for Android applications.By using HILT, developers can more easily manage and inject the dependency relationship in the application, thereby improving the maintenance of development efficiency and code.This article will explore the technical principles of the Hilt framework to help developers better understand and apply the framework. 1. What is dependent injection? Dependent injection is a design mode for solving the dependency relationship between objects.In the traditional development model, objects need to manage and instantiated other objects they depend on themselves.In the dependency injection, the dependencies of the object are managed and injected by the container.This means that the object does not need to care about how to create the objects they depend, but to obtain these dependencies through injection. 2. Basic principles of the HILT framework HILT is a Dagger 2 framework, which simplifies the use of Dagger in Android.Dagger is a powerful dependency injection framework, but its configuration and use are relatively complicated.On the basis of Dagger, HILT simplifies the configuration process by providing an injectable Android class and a constructifier, and provides a better way to organize and manage injection -dependent relationships. The core of the HILT framework is to achieve dependent injection through annotations and code generation.Developers use the annotations provided by HILT to mark the objects that need to be injected, and then the HILT framework will generate the corresponding code during compilation to complete the dependent configuration. 3. The core annotation of the HILT framework The HILT framework provides multiple annotations to mark objects that need to be injected and create dependencies.The following is some commonly used annotations: -@HiltandroidApp: Used to mark the application class, indicating that this class is the entrance point of HILT. -@AndroidRypoint: Used to mark the Android class that needs to be injected, such as Activity, Fragment, Service, etc. -@Inject: Used to mark the dependent object that needs to be injected. 4. Example code of the HILT framework Below is a simple example code that demonstrates how to use the HILT framework for dependency injection: @HiltAndroidApp public class MyApplication extends Application { // ... } @AndroidEntryPoint public class MainActivity extends AppCompatActivity { @Inject MyDependency myDependency; // ... } @Module @InstallIn(ApplicationComponent.class) public class MyModule { @Provides public MyDependency provideMyDependency() { return new MyDependency(); } } public class MyDependency { // ... } In the above code, the `MyApplication" class is marked as `@hiltandroidApp`, indicating that it is the entry point of HILT.The `MainActivity` class is marked as`@AndroidEntrypoint`, indicating that this class needs to be relying on injecting.`MyDependency` class is marked as`@inject`, indicating that the dependent object that needs to be injected.Finally, the `mymodule` class uses the`@provides' annotation to provide an instantiated method of the `MyDependency` class. By using the HILT framework, we can directly inject the `MyDependency` object in the` MainActivity` class, and the instantiated process of manually creation and management dependencies is not required. Summarize: This article deeply analyzes the technical principles of the Hilt Android framework in the Java library.The HILT framework achieved dependency injection through annotations and code generation, simplifying the dependency management and injection process in Android applications.Developers can use the annotations provided by HILT to mark the objects that need to be injected, and write the corresponding module to provide an instantiated method of dependencies.Through the HILT framework, developers can easily manage and maintain the dependence of applications and improve development efficiency.