![]() ![]() Practical example of Dependency InjectionĬonsider a practical example in Kotlin code. A dependency is when one of the objects depends on the concrete implementation of another object. Here’s a quick peek at the search result screen in DroidWiki:īefore 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! What is Dependency Injection?įirst, what is a dependency? Any non-trivial software program is going to contain components that pass information and send message calls back and forth between one another.įor example, when using an Object Oriented Programming language (such as Java/Kotlin on Android), objects will call methods on other objects that they have references to. But you should definitely check out MediaWiki Etiquette. ![]() ![]() These API are public and there is no need to get API keys or other stuff. The Wikipedia API is based on MediaWiki, and you can find the documentation here. The DroidWiki app is a simple wikipedia client for android, based on Dagger 2 and OkHttp 3. ![]() In this tutorial, you’ll update an existing app named DroidWiki to use DI. In the end, relying on dependency injection will simplify your code quite a bit and also allow for a clearer path to writing testable code. And it is a key tool for building software systems that are maintainable and testable. It turns out that Dependency Injection is nowhere near as complex as its name implies. Update Note: This Dagger 2 tutorial is now up to date with the latest version of Android Studio, version 3.0.1, and uses Kotlin for app development. ![]()
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