Understand the advantages of Android dependence on libraries and use cases (UNDERSTANDING The Advantages and Use Cases of Android Dependency Injection Library)

Understand the advantages and use cases of Android dependence on library When developing Android applications, we often need to access many dependencies, such as network request libraries, databases, sharing premieres, etc.Moreover, if these dependencies need to be used in different components of applications, we may create examples of them in multiple places.Doing this will lead to redundant and difficult -to -maintain code.To solve this problem, you can use the dependen of injection. The main purpose of dependent injecting libraries is to decoup between different parts of the applied components to provide better testability, maintenance, and scalability.Here are some advantages that use dependency injection libraries: 1. Decacticity: Relying on the injection library can reduce direct coupling between components.They use the principles of inverted control (INVERSION of Control), which are instantiated and the creation of management dependencies by libraries, rather than created and holding dependencies by the component itself. 2. Testability: Dependent injection makes it easier to simulate dependencies in unit testing.You can use dependency injection containers to replace actual dependencies, so as to be more easily tested. 3. Maintainability: The use of dependencies in injection libraries can reduce duplicate code.When using the same dependencies in multiple components, you can reduce the copy of the code by injection into the required components.In this way, when you need to change the dependencies, you only need to modify the configuration of the dependent injecting container. 4. Scalability: By using dependency injection libraries, new dependencies can be added easier.Just add a new configuration to the dependent injection container, without the need to manually change the dependencies in the entire application. Below is an example of using Dagger 2 to rely on the injection library: First, you need to add the following dependencies to the project built.gradle file: gradle dependencies { implementation 'com.google.dagger:dagger:2.x' annotationProcessor 'com.google.dagger:dagger-compiler:2.x' } Create a module class to provide an instance of dependencies.For example, the following is a module class that provides a network request library Retrofit instance: @Module public class NetworkModule { @Provides public OkHttpClient provideOkHttpClient() { return new OkHttpClient.Builder().build(); } @Provides public Retrofit provideRetrofit(OkHttpClient okHttpClient) { return new Retrofit.Builder() .baseUrl("https://api.example.com") .client(okHttpClient) .build(); } } Next, create a component class to manage the creation and provision of dependencies.For example, the following is a simple container class: @Component(modules = NetworkModule.class) public interface MyComponent { void inject(MainActivity activity); } Then, in the component that needs to be used, the annotation is used to mark the fields or methods that need to be injected.For example, the following is an Activity class, which is marked with a network request library RETROFIT instance through annotations: public class MainActivity extends AppCompatActivity { @Inject Retrofit retrofit; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); MyComponent myComponent = DaggerMyComponent.create(); myComponent.inject(this); // Use Retrofit to make network requests } } In this example, the dependent injection container creates a Retrofit instance and automatically injected it into the Retrofit field of MainActivity. By using dependency injection libraries, we can easily decide the relationship between components and provide better testability, maintenance, and scalability.This design model can help us build a higher -quality Android application. To sum up, the advantages of Android dependence on libraries include decoupled, testability, maintenance, and scalability.By using dependency injection libraries, we can better manage and use dependencies, and improve the quality and maintenance of applications. I hope that this article will understand the advantages of Android dependence on library and how to use it.I wish you a better results in the development of Android application!