我正在编写一个应用程序，不幸的是，该应用程序需要两次API调用才能完成一个对象。一次调用TMDB以获取当前正在放映的电影的列表，然后再次调用TMDB以获取每部电影的TMDB ID以获取IMDB ID。
稍后我可能还会想再次调用OMDB以从那里获取数据，因为那是我们在电影页面本身上使用的数据。
我是RXJava的新手，而Retrofit的新手。我以老式的方式进行操作（嗯，我使用OKHTTP），但是我想使用RXJava切换到更优雅的版本，这对我来说似乎是完美的用例。
示例首次API调用
https://api.themoviedb.org/3/movie/now_playing?api_key={key}&language=en-US&page=1®ion=US
JSON响应
{
"results":[
{
"vote_count":425,
"id":345940,
"video":false,
"vote_average":6.2,
"title":"The Meg",
"popularity":164.309,
"poster_path":"/xqECHNvzbDL5I3iiOVUkVPJMSbc.jpg",
"original_language":"en",
"original_title":"The Meg",
"genre_ids":[
28,
878,
53,
27
],
"backdrop_path":"/ibKeXahq4JD63z6uWQphqoJLvNw.jpg",
"adult":false,
"overview":"A deep sea submersible pilot revisits his past fears in the Mariana Trench, and accidentally unleashes the seventy foot ancestor of the Great White Shark believed to be extinct.",
"release_date":"2018-08-10"
},
{
"vote_count":1027,
"id":353081,
"video":false,
"vote_average":7.4,
"title":"Mission: Impossible - Fallout",
"popularity":137.095,
"poster_path":"/AkJQpZp9WoNdj7pLYSj1L0RcMMN.jpg",
"original_language":"en",
"original_title":"Mission: Impossible - Fallout",
"genre_ids":[
12,
28,
53
],
"backdrop_path":"/5qxePyMYDisLe8rJiBYX8HKEyv2.jpg",
"adult":false,
"overview":"When an IMF mission ends badly, the world is faced with dire consequences. As Ethan Hunt takes it upon himself to fulfil his original briefing, the CIA begin to question his loyalty and his motives. The IMF team find themselves in a race against time, hunted by assassins while trying to prevent a global catastrophe.",
"release_date":"2018-07-27"
},
{
"vote_count":473,
"id":447200,
"video":false,
"vote_average":6,
"title":"Skyscraper",
"popularity":58.382,
"poster_path":"/5LYSsOPzuP13201qSzMjNxi8FxN.jpg",
"original_language":"en",
"original_title":"Skyscraper",
"genre_ids":[
28,
53,
18
],
"backdrop_path":"/oMKFQmoVgB69fyXfSMu0lGlHJP2.jpg",
"adult":false,
"overview":"Framed and on the run, a former FBI agent must save his family from a blazing fire in the world's tallest building.",
"release_date":"2018-07-13"
},
{
"vote_count":20,
"id":399360,
"video":false,
"vote_average":5.3,
"title":"Alpha",
"popularity":54.434,
"poster_path":"/afdZAIcAQscziqVtsEoh2PwsYTW.jpg",
"original_language":"en",
"original_title":"Alpha",
"genre_ids":[
53,
12,
18
],
"backdrop_path":"/nKMeTdm72LQ756Eq20uTjF1zDXu.jpg",
"adult":false,
"overview":"After a hunting expedition goes awry, a young caveman struggles against the elements to find his way home.",
"release_date":"2018-08-17"
},
{
"vote_count":14,
"id":476292,
"video":false,
"vote_average":4.9,
"title":"Maquia: When the Promised Flower Blooms",
"popularity":47.674,
"poster_path":"/qcnOKCPleLOTWPPgYI0YT1MOQwR.jpg",
"original_language":"ja",
"original_title":"さよならの朝に約束の花をかざろう",
"genre_ids":[
16
],
"backdrop_path":"/cfbjFQ14hSTgXChBEvaEjFiUaKb.jpg",
"adult":false,
"overview":"A story of encounters and partings interwoven between people; this is a human drama with feelings that touch one's heart gradually, which everyone has experienced at least once.",
"release_date":"2018-07-20"
},
{
"vote_count":312,
"id":345887,
"video":false,
"vote_average":6.3,
"title":"The Equalizer 2",
"popularity":41.975,
"poster_path":"/cQvc9N6JiMVKqol3wcYrGshsIdZ.jpg",
"original_language":"en",
"original_title":"The Equalizer 2",
"genre_ids":[
53,
28,
80
],
"backdrop_path":"/z6KLDE72SxE1A8JcJTmmnWArOvR.jpg",
"adult":false,
"overview":"Robert McCall returns to deliver his special brand of vigilante justice -- but how far will he go when it's someone he loves?",
"release_date":"2018-07-20"
},
{
"vote_count":59,
"id":455207,
"video":false,
"vote_average":7.2,
"title":"Crazy Rich Asians",
"popularity":33.287,
"poster_path":"/gnTqi4nhIi1eesT5uYMmhEPGNih.jpg",
"original_language":"en",
"original_title":"Crazy Rich Asians",
"genre_ids":[
35
],
"backdrop_path":"/zeHB7aP46Xs3u4aFLuAq2GFeUGb.jpg",
"adult":false,
"overview":"An American-born Chinese economics professor accompanies her boyfriend to Singapore for his best friend's wedding, only to get thrust into the lives of Asia's rich and famous.",
"release_date":"2018-08-15"
},
{
"vote_count":7,
"id":385448,
"video":false,
"vote_average":5.2,
"title":"The Little Mermaid",
"popularity":29.657,
"poster_path":"/1scpzHhPWDuRc21ci6Tfv5zfKnH.jpg",
"original_language":"en",
"original_title":"The Little Mermaid",
"genre_ids":[
12,
14,
10749,
18
],
"backdrop_path":"/7UY85MIj5IBOGhzL2kNByn7mSBj.jpg",
"adult":false,
"overview":"A young reporter and his niece discover a beautiful and enchanting creature they believe to be the real little mermaid.",
"release_date":"2018-08-17"
},
{
"vote_count":85,
"id":487558,
"video":false,
"vote_average":7.6,
"title":"BlacKkKlansman",
"popularity":29.592,
"poster_path":"/lTgROqb5nrzILPRjUY6JjDIrOhh.jpg",
"original_language":"en",
"original_title":"BlacKkKlansman",
"genre_ids":[
80,
18,
35,
36
],
"backdrop_path":"/gMVdhfQ7q9DFHhDkehrququjGPd.jpg",
"adult":false,
"overview":"Ron Stallworth, an African-American police officer from Colorado, successfully manages to infiltrate the local Ku Klux Klan and become the head of the local chapter.",
"release_date":"2018-08-10"
},
{
"vote_count":394,
"id":400155,
"video":false,
"vote_average":6.9,
"title":"Hotel Transylvania 3: Summer Vacation",
"popularity":29.384,
"poster_path":"/gjAFM4xhA5vyLxxKMz38ujlUfDL.jpg",
"original_language":"en",
"original_title":"Hotel Transylvania 3: Summer Vacation",
"genre_ids":[
10751,
14,
35,
16
],
"backdrop_path":"/m03jul0YdVEOFXEQVUv6pOVQYGL.jpg",
"adult":false,
"overview":"Dracula, Mavis, Johnny and the rest of the Drac Pack take a vacation on a luxury Monster Cruise Ship, where Dracula falls in love with the ship's captain, Ericka, who's secretly a descendant of Abraham Van Helsing, the notorious monster slayer.",
"release_date":"2018-06-30"
},
{
"vote_count":101,
"id":420814,
"video":false,
"vote_average":7.2,
"title":"Christopher Robin",
"popularity":26.982,
"poster_path":"/xR5w0he6czZkcAz459a4iPBqXGe.jpg",
"original_language":"en",
"original_title":"Christopher Robin",
"genre_ids":[
16,
12,
35
],
"backdrop_path":"/uDt8bQ4lGVlabEx5Gl2cPzvy6qz.jpg",
"adult":false,
"overview":"Working-class family man Christopher Robin encounters his childhood friend Winnie-the-Pooh, who helps him to rediscover the joys of life.",
"release_date":"2018-08-03"
},
{
"vote_count":435,
"id":458423,
"video":false,
"vote_average":7.8,
"title":"Mamma Mia! Here We Go Again",
"popularity":25.931,
"poster_path":"/aWicerX4Y7n7tUwRAVHsVcBBpj2.jpg",
"original_language":"en",
"original_title":"Mamma Mia! Here We Go Again",
"genre_ids":[
35,
10749,
10402
],
"backdrop_path":"/8HKwxHZ23sW8wz4yb28IWnAM1M6.jpg",
"adult":false,
"overview":"Five years after meeting her three fathers, Sophie Sheridan prepares to open her mother’s hotel. In 1979, young Donna Sheridan meets the men who each could be Sophie’s biological father.",
"release_date":"2018-07-20"
},
{
"vote_count":101,
"id":454992,
"video":false,
"vote_average":6.4,
"title":"The Spy Who Dumped Me",
"popularity":24.345,
"poster_path":"/2lIr27lBdxCpzYDl6WUHzzD6l6H.jpg",
"original_language":"en",
"original_title":"The Spy Who Dumped Me",
"genre_ids":[
28,
35
],
"backdrop_path":"/9CqzJn0nLaDNM6QWfGkuox2Oi93.jpg",
"adult":false,
"overview":"Audrey and Morgan are best friends who unwittingly become entangled in an international conspiracy when one of the women discovers the boyfriend who dumped her was actually a spy.",
"release_date":"2018-08-03"
},
{
"vote_count":9,
"id":438590,
"video":false,
"vote_average":2.4,
"title":"A.X.L.",
"popularity":23.706,
"poster_path":"/9kB56ZdMB6RgY5QtX9Bar45jCeI.jpg",
"original_language":"en",
"original_title":"A.X.L.",
"genre_ids":[
878
],
"backdrop_path":"/l1nYo0yzKjf84atnBDbx0do16vQ.jpg",
"adult":false,
"overview":"The life of a teenage boy is forever altered by a chance encounter with cutting edge military technology.",
"release_date":"2018-08-24"
},
{
"vote_count":184,
"id":445651,
"video":false,
"vote_average":6.8,
"title":"The Darkest Minds",
"popularity":20.9,
"poster_path":"/94RaS52zmsqaiAe1TG20pdbJCZr.jpg",
"original_language":"en",
"original_title":"The Darkest Minds",
"genre_ids":[
878,
53
],
"backdrop_path":"/5BxrMNGl3YDiWgHCVJu8iLQoJDM.jpg",
"adult":false,
"overview":"After a disease kills 98% of America's children, the surviving 2% develop superpowers and are placed in internment camps. A 16-year-old girl escapes her camp and joins a group of other teens on the run from the government.",
"release_date":"2018-08-03"
},
{
"vote_count":5,
"id":489999,
"video":false,
"vote_average":5.2,
"title":"Searching",
"popularity":20.762,
"poster_path":"/9N0T3BaHZNdUCcMZQIM3yMUFwEh.jpg",
"original_language":"en",
"original_title":"Searching",
"genre_ids":[
18,
53
],
"backdrop_path":"/1q5AauYD1szopz5qnd6qqxnpTHG.jpg",
"adult":false,
"overview":"After his 16-year-old daughter goes missing, a desperate father breaks into her laptop to look for clues to find her. A thriller that unfolds entirely on computer screens.",
"release_date":"2018-08-24"
},
{
"vote_count":20,
"id":347375,
"video":false,
"vote_average":5.1,
"title":"Mile 22",
"popularity":19.505,
"poster_path":"/2L8ehd95eSW9x7KINYtZmRkAlrZ.jpg",
"original_language":"en",
"original_title":"Mile 22",
"genre_ids":[
28
],
"backdrop_path":"/wWoCid7YUxiLhq3ZZT6CtFEDPXw.jpg",
"adult":false,
"overview":"A CIA field officer and an Indonesian police officer are forced to work together in confronting political corruption. An informant must be moved twenty-two miles to safety.",
"release_date":"2018-08-17"
},
{
"vote_count":28,
"id":439015,
"video":false,
"vote_average":4.3,
"title":"Slender Man",
"popularity":18.529,
"poster_path":"/huSncs4RyvQDBmHjBBYHSBYJbSJ.jpg",
"original_language":"en",
"original_title":"Slender Man",
"genre_ids":[
27
],
"backdrop_path":"/5K0fgMaJSdEvqSsS8e3Ez4TpvXR.jpg",
"adult":false,
"overview":"In a small town in Massachusetts, four high school girls perform a ritual in an attempt to debunk the lore of Slender Man. When one of the girls goes mysteriously missing, they begin to suspect that she is, in fact, his latest victim.",
"release_date":"2018-08-10"
},
{
"vote_count":1,
"id":456086,
"video":false,
"vote_average":0,
"title":"Support the Girls",
"popularity":17.759,
"poster_path":"/leS393QLCe9UyY9TuWT8OvwuNk1.jpg",
"original_language":"en",
"original_title":"Support the Girls",
"genre_ids":[
18
],
"backdrop_path":"/wMiJPxdZ4avOtqijP62T6yR1wqo.jpg",
"adult":false,
"overview":"Lisa Conroy may not love managing the restaurant Double Whammies, but she loves her employees more than anything, not only Danyelle, and Maci, her closest friends, but also her extended family. Unfortunately, the cheap, curmudgeonly owner Ben Cubby doesn’t care nearly as much, and confronts Lisa when he learns that she’s using the restaurant to raise money for Shaina, an employee in legal trouble related to an abusive boyfriend. To get even, the girls decide to sabotage the restaurant on the night of a major mixed martial arts fight.",
"release_date":"2018-08-24"
},
{
"vote_count":0,
"id":450484,
"video":false,
"vote_average":0,
"title":"An L.A. Minute",
"popularity":17.665,
"poster_path":"/aI2CN1QloY8ZWdeNJac7EQjeHkt.jpg",
"original_language":"en",
"original_title":"An L.A. Minute",
"genre_ids":[
],
"backdrop_path":null,
"adult":false,
"overview":"Best-selling author Ted Gold faces a moral dilemma when Velocity, an avant-garde performance artist and the living embodiment of integrity, rocks his 1% world.",
"release_date":"2018-08-24"
}
],
"page":1,
"total_results":124,
"dates":{
"maximum":"2018-08-29",
"minimum":"2018-07-12"
},
"total_pages":7
}
对第二个API调用进行示例以获取IMDB ID
https://api.themoviedb.org/3/movie/345940?api_key={api_key}&language=en-US
JSON响应
{
"adult":false,
"backdrop_path":"/ibKeXahq4JD63z6uWQphqoJLvNw.jpg",
"belongs_to_collection":null,
"budget":150000000,
"genres":[
{
"id":28,
"name":"Action"
},
{
"id":878,
"name":"Science Fiction"
},
{
"id":53,
"name":"Thriller"
},
{
"id":27,
"name":"Horror"
}
],
"homepage":"http://www.themeg.movie",
"id":345940,
"imdb_id":"tt4779682",
"original_language":"en",
"original_title":"The Meg",
"overview":"A deep sea submersible pilot revisits his past fears in the Mariana Trench, and accidentally unleashes the seventy foot ancestor of the Great White Shark believed to be extinct.",
"popularity":164.309,
"poster_path":"/xqECHNvzbDL5I3iiOVUkVPJMSbc.jpg",
"production_companies":[
{
"id":56241,
"logo_path":null,
"name":"Maeday Productions",
"origin_country":""
},
{
"id":56242,
"logo_path":"/1YORRYmg7hgYIgoJek8jU3cykuQ.png",
"name":"Apelles Entertainment",
"origin_country":"US"
},
{
"id":48778,
"logo_path":"/tto2UKph873Xh1ytxfNBgCxT8NO.png",
"name":"Gravity Pictures",
"origin_country":"CN"
},
{
"id":435,
"logo_path":null,
"name":"Di Bonaventura Pictures",
"origin_country":"US"
},
{
"id":107790,
"logo_path":null,
"name":"Flagship Entertainment Group",
"origin_country":"CN"
}
],
"production_countries":[
{
"iso_3166_1":"CN",
"name":"China"
},
{
"iso_3166_1":"US",
"name":"United States of America"
}
],
"release_date":"2018-08-09",
"revenue":141500000,
"runtime":113,
"spoken_languages":[
{
"iso_639_1":"en",
"name":"English"
}
],
"status":"Released",
"tagline":"Chomp On This",
"title":"The Meg",
"video":false,
"vote_average":6.2,
"vote_count":426
}
电影对象
package watch.trigger.Model;
import com.google.gson.annotations.SerializedName;
/**
* Created by paxie on 10/7/17.
*/
public class Movie {
private String imdbID;
@SerializedName("Title")
private String title;
@SerializedName("Year")
private String year;
private String summary;
private String mpaaRating;
private double imdbRating;
@SerializedName("Poster")
private String posterURL;
private String award;
public Movie(String imdbID, String title, String year, String posterURL, String award) {
this.imdbID = imdbID;
this.title = title;
this.year = year;
this.posterURL = posterURL;
this.award = award;
}
public Movie(String imdbID) {
this.imdbID = imdbID;
}
public Movie(String imdbID, String title) {
this.imdbID = imdbID;
this.title = title;
}
public Movie() {
}
public String getImdbID() {
return imdbID;
}
public void setImdbID(String imdbID) {
this.imdbID = imdbID;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getYear() {
return year;
}
public void setYear(String year) {
this.year = year;
}
public String getSummary() {
return summary;
}
public void setSummary(String summary) {
this.summary = summary;
}
public String getMpaaRating() {
return mpaaRating;
}
public void setMpaaRating(String mpaaRating) {
this.mpaaRating = mpaaRating;
}
public double getImdbRating() {
return imdbRating;
}
public void setImdbRating(double imdbRating) {
this.imdbRating = imdbRating;
}
public String getPosterURL() {
return posterURL;
}
public void setPosterURL(String posterURL) {
this.posterURL = posterURL;
}
public String getAward() {
return award;
}
public void setAward(String award) {
this.award = award;
}
}
答案 0 :(得分：1)
在三个网络调用上进行combineLatest并将其包装在一个对象中，然后在订阅中将值拉出到最终对象中，并将其发送给演示者或显示器或其他业务逻辑
Observable.combineLatest(
networkCallOne().take(1),
networkCallTwo().take(1),
networkCallThree().take(1),
(obj1, obj2, obj3) -> new WrapperObject(obj1, obj2, obj3))
.observeOn(Schedulers.io())
.take(1)
.subscribeOn(AndroidSchedulers.mainThread())
.subscribe(wrapperObj -> {
//do some logic
})
对于CombineLatest
当任何可观察物发射出物品时，将 每个Observable通过指定函数发出的最新项目，以及 根据此功能的结果发射物品
这将等到所有3个网络呼叫返回然后合并最新值
take（1）只会确保您仅获得1个值。一定要处理错误，但这不会帮您解决