【发布时间】：2019-06-27 14:41:17
【问题描述】：
我正在尝试通过 API http://api.themoviedb.org/3/movie/ 的改造和 gson 检索 json。我的主要活动工作正常，但是当我在 DetailsActivity 中调用一些附加信息时，我发现我的数组中的模型是空的。这很奇怪，因为我什至从 api 接收到数组中正确数量的对象。但是当我从模型中记录一个值（例如 Log.d(TAG, movieTrailers.get(0).getName()) 时，应用程序崩溃了。使用 if 语句我发现这个值是空的。
例如，这是 API http://api.themoviedb.org/3/movie/297802/videos?api_key=。 （不幸的是，我不允许发布 api 密钥）它包含在有关电影的视频的 jsonarray 中。
这是我的代码：
模型：
public class MovieTrailer {
@SerializedName("key")
private String key;
@SerializedName("name")
private String name;
@SerializedName("type")
private String type;
public MovieTrailer(String key, String name, String type){
this.key = key;
this.name = name;
this.type = type;
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
}
列表模型：
public class TrailersList {
@SerializedName("results")
@Expose
private List<MovieTrailer> trailers = null;
public List<MovieTrailer> getTrailers() {
return trailers;
}
public void setTrailers(List<MovieTrailer> trailers) {
this.trailers = trailers;
}
}
适配器：
public class VideoAdapter extends RecyclerView.Adapter<VideoAdapter.VideoAdapterViewHolder> {
private List<MovieTrailer> movieTrailers;
private final VideoOnClickHandler videoOnClickHandler;
public interface VideoOnClickHandler{
void onClick(MovieTrailer movieTrailer);
}
public VideoAdapter(VideoOnClickHandler onClickHandler) {videoOnClickHandler = onClickHandler;}
public class VideoAdapterViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public final TextView videoTypeText;
public final TextView videoNameText;
public VideoAdapterViewHolder(View view){
super(view);
videoTypeText = (TextView) view.findViewById(R.id.tv_video_type);
videoNameText = (TextView) view.findViewById(R.id.tv_video_name);
view.setOnClickListener(this);
}
@Override
public void onClick(View view) {
int adapterPosition = getAdapterPosition();
MovieTrailer movieTrailer = movieTrailers.get(adapterPosition);
videoOnClickHandler.onClick(movieTrailer);
}
}
@NonNull
@Override
public VideoAdapterViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
Context context = viewGroup.getContext();
int gridItem = R.layout.movie_trailer;
LayoutInflater inflater = LayoutInflater.from(context);
boolean shouldAttachToParentImmediately = false;
View view = inflater.inflate(gridItem, viewGroup,shouldAttachToParentImmediately);
return new VideoAdapter.VideoAdapterViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull VideoAdapterViewHolder videoAdapterViewHolder, int i) {
MovieTrailer movieTrailer = movieTrailers.get(i);
videoAdapterViewHolder.videoTypeText.setText(movieTrailer.getType());
videoAdapterViewHolder.videoNameText.setText(movieTrailer.getName());
}
@Override
public int getItemCount() {
if (null == movieTrailers) return 0;
return movieTrailers.size();
}
//Function to set movieTrailers
public void setMovieTrailerArray(List<MovieTrailer> trailerArrayToSet){
movieTrailers = trailerArrayToSet;
notifyDataSetChanged();
}
}
界面：
public interface GetDataService {
@GET("{path}?api_key=" + BuildConfig.API_KEY)
Call<MoviesList> getAllMovies(@Path("path") String path);
@GET("{movieId}/reviews?api_key=" + BuildConfig.API_KEY)
Call<TrailersList> getAllTrailers(@Path("movieId") String movieId);
@GET("{movieId}/videos?api_key=" + BuildConfig.API_KEY)
Call<ReviewsList> getAllReviews(@Path("movieId") String movieId);
}
改造实例：
public class RetrofitClientInstance {
//Base URL for API request
private static final String MOVIE_DATABASE_URL_POPULAR =
"http://api.themoviedb.org/3/movie/";
/**
* Get Retrofit Instance
*/
private static Retrofit getRetrofitInstance() {
return new Retrofit.Builder()
.baseUrl(MOVIE_DATABASE_URL_POPULAR)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
/**
* Get API Service
*
* @return API Service
*/
public static GetDataService getApiService() {
return getRetrofitInstance().create(GetDataService.class);
}
}
还有来自DetailsActivity的方法：
private void loadMovieTrailers(String movieId){
GetDataService api = RetrofitClientInstance.getApiService();
Call<TrailersList> call = api.getAllTrailers(movieId);
call.enqueue(new Callback<TrailersList>() {
@Override
public void onResponse(Call<TrailersList> call, Response<TrailersList> response) {
if(response.isSuccessful()){
movieTrailers = response.body().getTrailers();
if(movieTrailers.get(0).getName() == null){
Log.d("MODEL", "Null");
}else {
Log.d("MODEL", "Not Null");
}
videoAdapter.setMovieTrailerArray(movieTrailers);
}
}
@Override
public void onFailure(Call<TrailersList> call, Throwable t) {
}
});
}
有人知道错误在哪里吗？
【问题讨论】：
标签： java android gson retrofit retrofit2