Dagger2-example | First steps using Dagger2 dependency Injection | Dependency Injection library
kandi X-RAY | Dagger2-example Summary
kandi X-RAY | Dagger2-example Summary
First steps using Dagger2 dependency Injection framework in Android
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Top functions reviewed by kandi - BETA
- Called when the activity is created
- Returns the root component
- Initialize the dependencies
- Initializes the dependency injector
- Called when the widget is destroyed
- Show a toast button pressed
- Injects main activity
- Shows a toast with given text
- Shows the welcome text
- Method triggered when welcome button pressed
Dagger2-example Key Features
Dagger2-example Examples and Code Snippets
Community Discussions
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QUESTION
I am trying to understand an example for an app with offline support using retrofit and room:
You can find the code for it here:
This project is using dependency injections with Dagger2. I've never worked with it so I am trying to understand how things work together. I understand the purpose of dependency injection but I don't understand the implementation of the project above.
I found a very good introduction into Dagger2 here:
A Friendly Introduction to Dagger 2
I worked through it and got most of it. Back to the actual project I am trying to understand (link 2). It still doesn't make sense to me and here is why:
The interface AppComponent has one method which is used:
public void inject(MainActivity2ViewModel viewModelModule);
The return type is void. In the Dagger2 sample project (link 3 and 4) they useWeatherReporter getWeatherReporter();
which makes sense because later they call this method to get a WeatherReporter-Instance and Dagger2 manages all of the instantation process in the background. But I get nothing if the return type is void. Why is the return type not an object?There is one
@Inject
in MainActivity2ViewModel:@Inject public void setRepository(GitHubRepository2 repository) { this.repository = repository; }
repository
is the only field of MainActivity2ViewModel
so it is a dependency. The GitHubRepository2
constructor has 3 parameters:
ANSWER
Answered 2019-Jun-16 at 21:43There's a lot of comprehensive tutorials about Dagger2 in Android. But I'll show you a glimpse of what it's used for. And minimal usage.
Ultimately, dagger will use the annotation @Inject which will provide(reference to the object or value) to the variable.
Injection is usually used on reusable or boilerplate objects like Dao, Repository, ViewModel, NetworkAdapter
QUESTION
Hello I have the following problem using Dagger 2 in my (part) project being completely pure-Java with no android dependencies.
When I run the unit tests using some mocks (e.g. Injecting a Mock Network Connector returning static Strings) over the Gradle view or console (businessModule:test) there are no problems and all tests Succeed. But when I open the files in Android Studio the Studio says that the Return of my DaggerMockComponent is not compatible with the target type. Opening the generated Component-Implementation, I see that Android Studio thinks the TestUnit-Class (and the interface MockComponent) is not available so it does not know what the inject method returns.
I have the following gradle file:
apply plugin: 'java'
...ANSWER
Answered 2017-Jan-20 at 07:51Ok everybody, after an additional night and some research on the android-apt plugin I stumbled over the pure-Java apt (net.ltgt.apt) and now I have a working solution in combination with the idea-plugin
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Install Dagger2-example
You can use Dagger2-example like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Dagger2-example component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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