How do you give context in Dagger 2?
How do you give context in Dagger 2?
3 Answers. You can use the @Provides annotation in your DaggerModule to obtain application Context. Alternatively you can create a module which accepts a Context parameter in its constructor in case you need activity context. Then you can build the component in your activity and inject the arguments into it.
How do you use a dagger injection?
3. Exercise: Dependency injection with Dagger 2
- 3.1. Create example project for the usage of Dagger 2.
- 3.2. Define or adjust Maven build file.
- 3.3. Define classes which have a dependency.
- 3.4. Define modules which provides dependencies.
- 3.5. Define components.
- 3.6. Use the generated dagger code.
What is dagger and explain dependency injection?
Dagger 2 is a compile-time android dependency injection framework that uses Java Specification Request 330 and Annotations. Some of the basic annotations that are used in dagger 2 are: @Module This annotation is used over the class which is used to construct objects and provide the dependencies.
What is component builder?
A builder for a component. Components may have a single nested static abstract class or interface annotated with @Component. If they do, then the component’s generated builder will match the API in the type.
What is dagger module?
Modules are a way of telling Dagger how to provide dependencies from the dependency graph. These are typically high level dependencies that you aren’t already contributing to the dependency graph through the @Inject constructor annotation we discussed in our previous article.
Why do we use dagger?
The idea behind dagger-android is to reduce the boilerplate needed to inject objects. To be even more specific, the idea is to reduce that boilerplate code in Fragments, Activities or any other Android framework classes that are instantiated by the OS.
What is dagger component?
Dagger components. Dagger can create a graph of the dependencies in your project that it can use to find out where it should get those dependencies when they are needed. This is called a Dagger component; it contains a graph that consists of the objects that Dagger knows how to provide and their respective dependencies …
What is the benefit of dagger?
Benefits of using Dagger Dagger frees you from writing tedious and error-prone boilerplate code by: Generating the AppContainer code (application graph) that you manually implemented in the manual DI section. Creating factories for the classes available in the application graph.
What is dynamicdagger 2?
Dagger 2 is a dependency injection framework developed by Google. It is not to be confused with the Dagger 1 Framework which is the previous version developed by Square. Please note that the in the following paragraphs, I will also qualify Dagger 2 by Dagger (without numbers) Da g ger 2 allows to define and configure dependencies using annotations.
What is the use of Android-Dagger 2?
It also allows to inject into Android components such as Activities and Fragments thanks to Android-Dagger. In fact, Dagger 2 can be divided into two parts: Dagger-Android: which allows to inject objects into Android components such as Activities and Fragments This article studies Dagger DI annotations through a console application.
What are @inject and @provides annotations in dagger?
@Inject and @Provides: class that have this annotations are integrated in the dependency graph of Dagger. @Component: used to annotate the interface that returns the root object of the graph. The next section proposes a solution using some of these annotations.
How do you implement an interface in Dagger 2?
By applying the @Component annotation to such an interface and passing the module types to the modules parameter, Dagger 2 then fully generates an implementation of that contract. The implementation has the same name as the interface prefixed with Dagger .
