FrancescoBonizzi

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testdi">

    <application
        android:name="com.example.testdi.MyApp"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"

FrancescoBonizzi

import android.app.Application
import com.example.testdi.di.appDependencies
import org.koin.android.ext.koin.androidContext
import org.koin.android.ext.koin.androidLogger
import org.koin.core.context.startKoin

class MyApp : Application() {

    override fun onCreate() {
        super.onCreate()

FrancescoBonizzi

import com.example.testdi.storage.FakeInMemoryUsersRepository
import com.example.testdi.storage.IUsersRepository
import org.koin.dsl.module

val appDependencies = module {

    // Singleton (returns always the same unique instance of the object)
    single<IUsersRepository> { FakeInMemoryUsersRepository() }

    // Transient (returns always the a new instance of the object)

FrancescoBonizzi

private val usersRepository: IUsersRepository by inject()

FrancescoBonizzi

implementation "org.koin:koin-android:$koin_version"

FrancescoBonizzi

ext.koin_version = "2.1.5"

FrancescoBonizzi

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.example.testdi.domain.User
import com.example.testdi.storage.IUsersRepository
import java.text.SimpleDateFormat

class MainActivity : AppCompatActivity() {

    private val dateFormat: SimpleDateFormat = SimpleDateFormat("dd/MM/yyyy")
    private val usersRepository: IUsersRepository // Will compile in the next snippet :)

FrancescoBonizzi

import android.util.Log
import com.example.testdi.domain.User
import java.text.SimpleDateFormat

class FakeInMemoryUsersRepository : IUsersRepository {

    override fun getById(userId: Int): User {
        return User(
            "fbonizzi",
            "Francesco",

FrancescoBonizzi

interface IUsersRepository {
    fun getById(userId : Int) : User
    fun save(user: User)
}

FrancescoBonizzi

import java.util.*

data class User(
    val UserId : String,
    val Name : String,
    val Surname : String,
    val BirthDate : Date
)