Here, you can see we are not using single, and in place of that we are using viewModel and inside it, we resolve the dependencies which we are providing from appModule. Also, Let’s connect on Twitter, Linkedin, Github, and Facebook, If you are not familiar with why we need a dependency injection framework in our project, click here, Package name: com.mindorks.framework.mvvm. The path could be used to retrieve defined dependencies. Another thing that you would notice is that I can call startKoin without passing an Android Context. If you are not familiar with why we need a dependency injection framework in our project, click here. In this blog, we are going to learn about Koin, a new dependency injection framework for Android Developers. You describe your definitions with certain key functions that mean something in the Koin context. With this example above, you see that the test class implements KoinTest, and that is what gives you access to functions like get, inject, startKoin, getKoin, etc. Since google provided us with architecture components, it has been a ride with the MVVM architecture. That said, Dagger-2 really did the job when you finally got how it worked. It is similar to Dagger-2 @Singleton annotation. For the project, we are going to follow a basic version of MVVM. A pragmatic lightweight dependency injection framework for Kotlin developers. And finally, the ApiHelperImpl looks like. To setup Koin in your project, we would add the following in your app's build.gradle. Before we begin, if you don’t know what Dependency Injection is, here’s some great news: you’re probably already using it without knowing it! Here is an example: The createOnStart flag can be very helpful when you have some service(s) that might take time to resolve at runtime, it tells Koin to resolve those dependencies immediately when started and thus it could reduce or prevent lags when the user moves through the app. and to initialize Koin in the project we will update the onCreate() of the application like. Add the following dependencies in the app's build.gradle file. We are using get() here to pass the dependency to the constructor. We are naming that as Resource. Here is how to look at this, look at the modules and sub-modules as java packages, and the single or factory dependency definitions as java classes inside java packages. You use it to resolve any particular dependency that you need and it could be used as follows. import com.your.domain.ClassName). This is kinda what the override = true flag is doing, you are marking your definitions to override pre-existing definitions. First get the library into your project. Now, we will create a package di -> module and inside it, we will create AppModule, ViewModelModule, and RepositoryModule. And it can be used to retrieve dependencies like so: One thing to notice is that, when trying to retrieve dependencies, the module paths are separated by dots, and the module paths come before the ClassName. Now, we need to create the instance of ViewModel in the MainActivity so the values passed in the constructor of the ViewModel are passed to it. I will mention some comparisons with Dagger-2 if you are already familiar with it, and if you are not, don’t worry, just ignore those parts. The difference is, get is eagerly evaluated, that is, when Object creation gets to the field initialization phase, SomeOtherService will be retrieved from the dependency container, but SomeLazyService will not be resolved until the class tries to use it, because it is lazily evaluated, that is why the by keyword is used. Dealing with dependency injection is one complex concept that I managed to understand before coming into the JVM space. Another helpful thing is that Koin gives a method that helps check that your dependency graph is well set up, so it will try and resolve all dependencies one by one in your graph. Using get it will only provide the constructor whose instance is already been provided by Koin. First, add the test library as a dependency in your module level gradle file. We will update the file like. Activity, Fragment, ContentProvider or Service). And for ApiHelper, we would need the ApiHelperImpl part to be provided which is the extension for ApiHelper. Here, we are going to set up the Android Project. Here, we are passing the androidContext to the Koin container which you can see we are using it in the appModule while providing the NetworkHelper class. Here, MainRepository requires ApiHelper in the constructor which will be provided by the Koin here. For example: With Koin, setting up dependency injection is kind of a manual process, you essentially plug your services into the module graphs and those dependencies will later get resolved at runtime. Now, to pass the ApiHelper as a param, we need to provide it as well from the module. To provide the ApiHelperImpl in the module, we will update the code and create a single instance like. Here are the key functions. You also have situations where you want to provide an implementation for an interface, you can also do that using the automatic resolve with factoryBy, or you can manually build the dependency and specify the interface as the generic type parameter. This is what the code-block version of the factory does, you see first I create a new date and then I pass it as a constructor argument to create the SomeClass instance, which I return. Now, in the project what we will do is, we will do an API call and show a list of users. Here, we are providing a type if ApiHelper, and returning ApiHelperImpl and in ApiHelperImpl it takes ApiService as a constructor parameter which we are already providing from provideApiService function. Similar to the factory above, there are a couple of ways to define a single bean. It is very light weighted. the protocol for the request (HTTP or HTTPS). I say this because Dagger-2 had complicated the concept for me when I came into android. To pass the instance of ViewModel we will create a variable called mainViewModel like. The dependency container can contain configuration properties or values that can be read and set at runtime. Also, for BASE_URL, we will add the following in the defaultConfig block in the app's build.gradle file. You will need to add the following to your module-level build.gradle. Our package in the project will look like below: We need the enum to represent the UI State. Neglect it and you will soon feel the painful experience that all your code is closely tied to the android framework, and you cannot really test your app in a meaningful and actually useful way. The specified scope_id can then later be used as a reference, in creating, requesting or closing a scope. The module is a collection of dependencies we are going to provide to the application. We will create a variable like. Now, inside the MainRepository, we will update the code like. You put all the services that a module should provide in the module block.

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