Kotlin Dependency Injection Library

Simple, Lightweight Dependency Injection solution for Kotlin / Android(Kotlin) that reduces boiler-plate code used in most Dependency Injection Solutions.

Table of contents

• Introduction and references
• Setup
  • Kotlin DSL
  • Groovy DSL
  • Maven

Introduction and references

An example of how to Setup and register objects into the Dependency com.kotlinizer.injection.Injector.

A good practice is to initialize the Dependency com.kotlinizer.injection.Injector in the early Lifecycle Stages, such as the onCreate() method of the Application.

import android.app.Application
import com.kotlinizer.injection.*

class MainApplication : Application() {
	
	private val injector: Injector by lazy { Injector.instance }
	override fun onCreate() {
		super.onCreate()
		
		// Load Dependencies
		val firstName = "Kotlin"
		val lastName = "Dependency-Injection"
		val phoneNumber = 5555555555L
		
		injector.register(type = String::class.java, provider = firstName, identifier = "FIRST_NAME")
		injector.register(type = String::class.java, provider = lastName, identifier = "LAST_NAME")
		injector.register(type = Long::class.java, provider = phoneNumber)
		
	}
}

An example of how to retrieve, or resolve, the object from the Dependency.

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.kotlinizer.injection.*

class MainActivity : AppCompatActivity() {
	private val injector: Injector by lazy { Injector.instance }
	override fun onCreate(savedInstanceState: Bundle?) {
		super.onCreate(savedInstanceState)
		setContentView(R.layout.activity_main)
		// Retrieve the data from the Dependency com.kotlinizer.injection.Injector.
		val firstName: String? = injector.resolve(type = String::class.java, identifier = "FIRST_NAME")
		val lastName: String? = injector.resolve(type = String::class.java, identifier = "LAST_NAME")
		// No identifier is passed, as we didn't use one when being registered.
		val phoneNumber: Long? = injector.resolve(type = Long::class.java)
	}
}

Full example can be found here

In Action:

Setup

To setup, simply add this dependency to your project and everything should be ready to go!

Kotlin DSL

dependencies {
    implementation("com.kotlinizer:injection:1.0.4")
}

Groovy DSL

dependencies {
    implementation 'com.kotlinizer:injection:1.0.4'
}

Maven

<dependency>
    <groupId>com.kotlinizer</groupId>
    <artifactId>injection</artifactId>
    <version>1.0.4</version>
</dependency>