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Moshi Kotlin Codegen Example with Custom Adapter
//app build.gradle
apply plugin: 'kotlin-kapt'
...
dependencies {
{
//Moshi Core
implementation "com.squareup.moshi:moshi:1.8.0"
//Moshi Codegen
kapt "com.squareup.moshi:moshi-kotlin-codegen:1.8.0"
}
//Movie JSON
{
"vote_count": 2026,
"id": 19404,
"title": "Example Movie",
"image_path": "/this-is-an-example-movie-image.jpg",
"genre_ids": [
35,
18,
10749
],
"overview": "Overview of example movie"
}
@JsonClass(generateAdapter = true)
data class Movie (
@Json(name = "vote_count") val voteCount: Int = -1,
val id: Int,
val title: String,
@Json(name = "image_path") val imagePath: String,
@Json(name = "genre_ids") val genres: List<Genre>,
val overview: String
)
@JsonClass(generateAdapter = true)
data class Genre(val id: Int, val name: String)
//Movie genres from the The movie database - https://www.themoviedb.org/
class GenreAdapter {
@ToJson
fun toJson(genres: List<Genre>): List<Int> {
return genres.map { genre -> genre.id}
}
@FromJson
fun fromJson(genreId: Int): Genre {
when (genreId) {
28 -> return Genre(28, "Action")
12 -> return Genre(12, "Adventure")
16 -> return Genre(16, "Animation")
35 -> return Genre(35, "Comedy")
80 -> return Genre(80, "Crime")
99 -> return Genre(99, "Documentary")
18 -> return Genre(18, "Drama")
10751 -> return Genre(10751, "Family")
14 -> return Genre(14, "Fantasy")
36 -> return Genre(36, "History")
27 -> return Genre(27, "Horror")
10402 -> return Genre(10402, "Music")
10749 -> return Genre(10749, "Romance")
9648 -> return Genre(9648, "Mystery")
878 -> return Genre(878, "Science Fiction")
10770 -> return Genre(10770, "TV Movie")
53 -> return Genre(53, "Mystery")
10752 -> return Genre(10752, "War")
37 -> return Genre(37, "Western")
else -> throw JsonDataException("unknown genre id: $genreId")
}
}
}
val moshi: Moshi = Moshi.Builder().add(GenreAdapter()).build()
val adapter: JsonAdapter<Movie> = moshi.adapter(Movie::class.java)
val movie = adapter.fromJson(moviesJson))
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