如何用改进和GSON解析嵌套列表？

Question

   @GET("/3/discover/movie?api_key=${apiKey}&language=en-US&sort_by=popularity.desc&include_adult=false&include_video=false&page=1")
   fun getMovies(): Single<List<Movie>>
}

 private val api = Retrofit.Builder()
        .baseUrl(BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
        .build()
        .create(MoviesApi::class.java)

    fun getMovies(): Single<List<Movie>> {
        return api.getMovies()
    }

{
    "page": 1,
    "total_results": 10000,
    "total_pages": 500,
    "results": [
        {
            "popularity": 259.91,
            "vote_count": 366,
            "video": false,
            "poster_path": "/aQvJ5WPzZgYVDrxLX4R6cLJCEaQ.jpg",
            "id": 454626,
            "adult": false,
            "backdrop_path": "/qonBhlm0UjuKX2sH7e73pnG0454.jpg",
            "original_language": "en",
            "original_title": "Sonic the Hedgehog",
            "genre_ids": [
                28,
                35,
                878,
                10751
            ],
            "title": "Sonic the Hedgehog",
            "vote_average": 7.1,
            "overview": "Based on the global blockbuster videogame franchise from Sega, Sonic the Hedgehog tells the story of the world’s speediest hedgehog as he embraces his new home on Earth. In this live-action adventure comedy, Sonic and his new best friend team up to defend the planet from the evil genius Dr. Robotnik and his plans for world domination.",
            "release_date": "2020-02-12"
        },
        {
            "popularity": 253.357,
            "vote_count": 4333,
            "video": false,
            "poster_path": "/7IiTTgloJzvGI1TAYymCfbfl3vT.jpg",
            "id": 496243,
            "adult": false,
            "backdrop_path": "/TU9NIjwzjoKPwQHoHshkFcQUCG.jpg",
            "original_language": "ko",
            "original_title": "기생충",
            "genre_ids": [
                35,
                18,
                53
            ],
            "title": "Parasite",
            "vote_average": 8.6,
            "overview": "All unemployed, Ki-taek's family takes peculiar interest in the wealthy and glamorous Parks for their livelihood until they get entangled in an unexpected incident.",
            "release_date": "2019-05-30"
        },
        {
            "popularity": 213.161,
            "vote_count": 2415,
            "video": false,
            "poster_path": "/xBHvZcjRiWyobQ9kxBhO6B2dtRI.jpg",
            "id": 419704,
            "adult": false,
            "backdrop_path": "/5BwqwxMEjeFtdknRV792Svo0K1v.jpg",
            "original_language": "en",
            "original_title": "Ad Astra",
            "genre_ids": [
                12,
                18,
                9648,
                878,
                53
            ],
            "title": "Ad Astra",
            "vote_average": 6,
            "overview": "The near future, a time when both hope and hardships drive humanity to look to the stars and beyond. While a mysterious phenomenon menaces to destroy life on planet Earth, astronaut Roy McBride undertakes a mission across the immensity of space and its many perils to uncover the truth about a lost expedition that decades before boldly faced emptiness and silence in search of the unknown.",
            "release_date": "2019-09-17"
        },
        {
            "popularity": 171.658,
            "vote_count": 776,
            "video": false,
            "poster_path": "/h4VB6m0RwcicVEZvzftYZyKXs6K.jpg",
            "id": 495764,
            "adult": false,
            "backdrop_path": "/uozb2VeD87YmhoUP1RrGWfzuCrr.jpg",
            "original_language": "en",
            "original_title": "Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)",
            "genre_ids": [
                28,
                35,
                80
            ],
            "title": "Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)",
            "vote_average": 6.8,
            "overview": "After her breakup with the Joker, Harley Quinn joins forces with singer Black Canary, assassin Huntress, and police detective Renee Montoya to help a young girl named Cassandra, who had a hit placed on her after she stole a rare diamond from crime lord Roman Sionis.",
            "release_date": "2020-02-05"
        },
        {
            "popularity": 154.297,
            "vote_count": 2258,
            "video": false,
            "poster_path": "/pThyQovXQrw2m0s9x82twj48Jq4.jpg",
            "id": 546554,
            "adult": false,
            "backdrop_path": "/cjTQSwcsfVdirSFSHNBXRGkxmWa.jpg",
            "original_language": "en",
            "original_title": "Knives Out",
            "genre_ids": [
                35,
                80,
                18,
                9648,
                53
            ]

 Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $

data class Movie(
    val page: Int?,
    val total_results: Int?,
    val total_pages: Int?,
    val results: List<MovieData>
)

data class MovieData(
    val popularity: Int?,
    val vote_count: Int?,
    val video: Boolean?,
    val poster_path: String?,
    val id: Int?,
    val adult: Boolean?,
    val backdrop_path: String?,
    val original_language: String?,
    val original_title: String?,
    val genre_ids: List<Int>?,
    val title: String?,
    val vote_average: Int?,
    val overview: String?,
    val release_date: String?
)

Answer 1

基本上，您的响应是一个JSON对象，而您试图将其解析为一个JSON数组。您的模型类movie是您获得的响应。因此，如果您想要完整的响应，请使用

fun getMovies(): Single<Movie>

这将给出完整的响应，其中包含results:list 的值以及返回的其他参数。

希望这能帮到你