我正在嘗試使用此 api 聯(lián)網(wǎng)：https : //api.jikan.moe/v3/schedule所以我通過創(chuàng)建 ApiClient.java 類來使用改造，這是它的代碼：public class ApiClient {public static final String BASE_URL = "http://api.themoviedb.org/3/";private static Retrofit retrofit = null;public static Retrofit getClient() { if (retrofit==null) { retrofit = new Retrofit.Builder() .baseUrl(BASE_URL) .addConverterFactory(GsonConverterFactory.create()) .build(); } return retrofit;}}完整的鏈接端點(diǎn)的接口是這樣的：public interface ApiInterface { @GET("schedule") Call<MainResponse> getSchedule();}所以我在建模數(shù)據(jù)中使用了可序列化，并創(chuàng)建了 MainResponse.java 類來獲取 api 中的主要 monday 數(shù)組：公共類 MainResponse {@SerializedName("monday")private List<Schedule> monday;public List<Schedule> getMonday() { return monday;}public void setMonday(List<Schedule> monday) { this.monday = monday;}}然后我創(chuàng)建一個新的建模類來獲取類 Schedule.java 中 monday 數(shù)組的對象項列表：public class Schedule { @SerializedName("title") private String title; public Schedule(String title) { this.title = title; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; }}最后在 MainActivity 我稱之為：final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.schedule_recycler_view); recyclerView.setLayoutManager(new LinearLayoutManager(this)); ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class); Call<MainResponse> call = apiService.getSchedule(); call.enqueue(new Callback<MainResponse>() {正如你所看到的，我使用了一個 recycleview 來獲取 monday 數(shù)組的標(biāo)題，但問題是當(dāng)我運(yùn)行應(yīng)用程序時，它只是因為這個而崩潰：嘗試在空對象引用上調(diào)用虛擬方法“java.util.List com.example.user_pc.capstonestage2.MainResponse.getMonday()”
2 回答
FFIVE
TA貢獻(xiàn)1797條經(jīng)驗 獲得超6個贊
您已聲明錯誤的 API URL 是：
public static final String BASE_URL = "https://api.jikan.moe/v3/";
你MainResponse應(yīng)該是這樣的：
public class MainResponse {
@SerializedName("request_hash")
@Expose
private String requestHash;
@SerializedName("request_cached")
@Expose
private Boolean requestCached;
@SerializedName("request_cache_expiry")
@Expose
private Integer requestCacheExpiry;
@SerializedName("monday")
@Expose
private List<Monday> monday = null;
public String getRequestHash() {
return requestHash;
}
public void setRequestHash(String requestHash) {
this.requestHash = requestHash;
}
public Boolean getRequestCached() {
return requestCached;
}
public void setRequestCached(Boolean requestCached) {
this.requestCached = requestCached;
}
public Integer getRequestCacheExpiry() {
return requestCacheExpiry;
}
public void setRequestCacheExpiry(Integer requestCacheExpiry) {
this.requestCacheExpiry = requestCacheExpiry;
}
public List<Monday> getMonday() {
return monday;
}
public void setMonday(List<Monday> monday) {
this.monday = monday;
}
}
該Genre班
public class Genre {
@SerializedName("mal_id")
@Expose
private Integer malId;
@SerializedName("type")
@Expose
private String type;
@SerializedName("name")
@Expose
private String name;
@SerializedName("url")
@Expose
private String url;
public Integer getMalId() {
return malId;
}
public void setMalId(Integer malId) {
this.malId = malId;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
最后是Monday班級
public class Monday {
@SerializedName("mal_id")
@Expose
private Integer malId;
@SerializedName("url")
@Expose
private String url;
@SerializedName("title")
@Expose
private String title;
@SerializedName("image_url")
@Expose
private String imageUrl;
@SerializedName("synopsis")
@Expose
private String synopsis;
@SerializedName("type")
@Expose
private String type;
@SerializedName("airing_start")
@Expose
private String airingStart;
@SerializedName("episodes")
@Expose
private Integer episodes;
@SerializedName("members")
@Expose
private Integer members;
@SerializedName("genres")
@Expose
private List<Genre> genres = null;
@SerializedName("source")
@Expose
private String source;
@SerializedName("producers")
@Expose
private List<Object> producers = null;
@SerializedName("score")
@Expose
private Object score;
@SerializedName("licensors")
@Expose
private List<Object> licensors = null;
@SerializedName("r18")
@Expose
private Boolean r18;
@SerializedName("kids")
@Expose
private Boolean kids;
public Integer getMalId() {
return malId;
}
public void setMalId(Integer malId) {
this.malId = malId;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getSynopsis() {
return synopsis;
}
public void setSynopsis(String synopsis) {
this.synopsis = synopsis;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getAiringStart() {
return airingStart;
}
public void setAiringStart(String airingStart) {
this.airingStart = airingStart;
}
public Integer getEpisodes() {
return episodes;
}
public void setEpisodes(Integer episodes) {
this.episodes = episodes;
}
public Integer getMembers() {
return members;
}
public void setMembers(Integer members) {
this.members = members;
}
public List<Genre> getGenres() {
return genres;
}
public void setGenres(List<Genre> genres) {
this.genres = genres;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public List<Object> getProducers() {
return producers;
}
public void setProducers(List<Object> producers) {
this.producers = producers;
}
public Object getScore() {
return score;
}
public void setScore(Object score) {
this.score = score;
}
public List<Object> getLicensors() {
return licensors;
}
public void setLicensors(List<Object> licensors) {
this.licensors = licensors;
}
public Boolean getR18() {
return r18;
}
public void setR18(Boolean r18) {
this.r18 = r18;
}
public Boolean getKids() {
return kids;
}
public void setKids(Boolean kids) {
this.kids = kids;
}
}
qq_花開花謝_0
TA貢獻(xiàn)1835條經(jīng)驗 獲得超7個贊
您的 api 鏈接是https://api.jikan.moe/v3/schedule 但在您編寫的代碼中
public static final String BASE_URL = "http://api.themoviedb.org/3/";
您可以將基本 url 更改為https://api.jikan.moe/v3/，或者
在 getSchedule() 的 GET 注釋上提供完整的 url
@GET("https://api.jikan.moe/v3/schedule")
Call<MainResponse> getSchedule();
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