How to use Retrofit in Android

Issue #366

Code uses Retrofit 2.6.0 which has Coroutine support

app/build.gradle

implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0-alpha01"

implementation "com.squareup.moshi:moshi:$Version.moshi"

implementation "com.squareup.retrofit2:retrofit:$Version.retrofit"
implementation "com.squareup.retrofit2:converter-moshi:$Version.retrofit"

Api.kt

import retrofit2.http.GET

interface Api {
    @GET("api/articles")
    suspend fun getArticles(): List<Article>
}

Repo.kt

import retrofit2.Retrofit
import retrofit2.converter.moshi.MoshiConverterFactory

class Repo {
    fun get(): Api {
        return Retrofit.Builder()
            .baseUrl("https://dev.to")
            .addConverterFactory(MoshiConverterFactory.create())
            .build()
            .create(Api::class.java)
    }
}

ViewModel.kt

import androidx.lifecycle.ViewModel
import androidx.lifecycle.liveData
import kotlinx.coroutines.Dispatchers

class ViewModel(val repo: Repo): ViewModel() {
    val articles = liveData(Dispatchers.Main) {
        emit(repo.get().getArticles().toCollection(ArrayList()))
    }
}

Article.kt

import com.squareup.moshi.Json

data class Article(
    @field:Json(name="type_of") val typeOf: String,
    @field:Json(name="title") val title: String
)