The technical implementation principles of the HILT Android framework in the Java library (Explration of the Technical Implementation Principles of Hilt Android Framework in Java Class Libraries)

The Hilt Android framework is a dependent injection solution released by Google's officially released to simplify the dependent relationship management in Android applications.This article will explore the technical implementation principles of the Hilt Android framework in the Java class library, and deepen understanding by providing some Java code examples. 1. What is dependent injection? Dependent injection is a software design pattern that allows objects to inject it the dependent items in it when creating, rather than create or find dependencies internally.This can improve the maintenance, testability and scalability of the code. 2. Introduction to Hilt Android framework Hilt Android is a packaging library based on Dagger 2. It simplifies the use of Dagger 2 and provides more convenient dependency injection solutions.Hilt Android provides a set of annotations and agreement to help developers manage dependency relationships through automatic code generation. 3. Step of the use of hilt android First, you need to add hilt -related dependencies to the project's Build.gradle file: dependencies { implementation 'com.google.dagger:hilt-android:2.35' kapt 'com.google.dagger:hilt-android-compiler:2.35' } Then, add @HILTANDROIDAPP annotation to the applied Application class to indicate that the application uses the Hilt Android framework: @HiltAndroidApp public class MyApp extends Application { // ... } Next, you need to add corresponding annotations to the dependent object to identify it as an injectable object. For example, we create a class called UserRepository for processing and operation of user data: @Singleton public class UserRepository { // ... } By adding @Singleton annotations, this class is a single example. Then, the dependencies are declared by constructing a function or field by constructing a function or field where you need to use UserRePOSITORY: public class UserService { private UserRepository userRepository; @Inject public UserService(UserRepository userRepository) { this.userRepository = userRepository; } // ... } Finally, in the use of HILT's Activity or Fragment, you can use @AndRoidentryPoint annotations from the inject dependencies: @AndroidEntryPoint public class MainActivity extends AppCompatActivity { @Inject UserService userService; // ... } 4. The working principle of Hilt Android Hilt Android uses a reasonable code generation strategy when compiling, and generates the required code through static analysis and processing annotations.It realizes dependency injection by generating a Dagger 2 component, and combines the component with the auxiliary class generated by the annotation processor to provide an instance that depends on objects. HILT Android's annotation processor will generate corresponding components according to the scope specified in the annotation (such as single examples, Activity, and Fragment). This component is a dependent entrance.In this way, when you need to inject dependencies, Hilt Android can provide the correct instance. 5. The advantage of Hilt Android -Simply simplify the use of Dagger 2, reduce the amount of template code, and improve development efficiency. -Se consensus mode and agreement, making it easier for team members to understand and communicate. -In the dependency injection, the coupling between code is reduced, and the testability and maintenance of the application are improved. Summary: The Hilt Android framework is a strong dependency injection solution. By providing convenient annotations and code generation functions, it simplifies the management of dependencies in Android applications.By using Hilt Android, developers can focus more on the realization of business logic, and improve the readability and maintenance of code. Note: In order to achieve a complete example code, more contexts and detailed explanations may be needed.