Good day, so my problem as follows. When I initialize the retrofit call it has following flow.
1.In the Presenterclass, it goes to getData method.
2.Then it goes to Interactorclass and creates a instance of itself.
3.Then it starts to fetch data from getMovieList method.
4.When it gets to call.enqueue it says OnDataCallback is null.
5.Goes back to Presenter and returns a null List.
6.It resumes call.enqueue does the api call as required.
7.Returns to Presenter and returns the List of objects.
I have tried so many things but non seem to work, maybe I'm understanding something incorrectly ,any help would be appreciated thanks.
Interactor Class.
public class MovieListInteractor implements IMovieContarctor.MovieListInteractor {
private InteractorListener mListener;
private List<MovieListModel> mList;
public MovieListInteractor(InteractorListener mListener) {
this.mListener = mListener;
}
public int getMovieSize() {
return mList.size();
}
@Override
public String getMoviePosterPath(int pos) {
return mList.get(pos).getPosterPath();
}
@Override
public MovieListModel getMovie(int pos) {
return mList.get(pos);
}
@Override
public List<MovieListModel> getMovieList() {
if (mList == null)
mList = new ArrayList<>();
ServerMovieCall mCall = new ServerMovieCall();
mCall.getMovieList(new IOnDataCallback<List<MovieListModel>>() {
@Override
public void onSuccess(List<MovieListModel> data) {
mList.addAll(data);
}
@Override
public void onFailure(String message) {
Log.d(TAG, "onFailure: " + message);
}
});
return mList;
}
}
Presenter class
public class MovieListPresenter implements IMovieContarctor.MovieListPresenter, InteractorListener {
private MovieListFragment mView;
private MovieListInteractor mInteractor;
private List<MovieListModel> mList;
public MovieListPresenter(MovieListFragment mView) {
this.mView = mView;
mInteractor = new MovieListInteractor(this);
getData();
}
//TODO: Add functionality so that the view could call mView.refreshAdapterList
//TODO: And from the view - adapter.notifiyDataSetChange;
@Override
public void onSuccess(List<MovieListModel> data, String msg) {
mView.onDataChange(data, msg);
}
@Override
public void onFailure(String msg) {
mView.onDataFailure(msg);
}
@Override
public void bindAtPosition(int position, MovieListViewHolder holder) {
holder.setValue(mInteractor.getMovie(position));
}
@Override
public void getData() {
mList = mInteractor.getMovieList();
}
@Override
public String getMoviePosterPath(int pos) {
return mInteractor.getMoviePosterPath(pos);
}
@Override
public int getSize() {
return mInteractor.getMovieSize();
}
}
Adapter
public class MovieListAdapter extends RecyclerView.Adapter<MovieListViewHolder> {
private MovieListPresenter mPresenter;
private Context ctx;
public MovieListAdapter(MovieListPresenter mPresenter, Context context) {
this.mPresenter = mPresenter;
this.ctx = context;
}
@Override
public MovieListViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new MovieListViewHolder(LayoutInflater.from(ctx).inflate(R.layout.main_view_movie_list, parent, false));
}
@Override
public void onBindViewHolder(MovieListViewHolder holder, int position) {
mPresenter.bindAtPosition(position, holder);
String image_url = IMAGE_URL_BASE_PATH + mPresenter.getMoviePosterPath(position);
Picasso.with(ctx).load(image_url).placeholder(android.R.drawable.sym_def_app_icon)
.error(android.R.drawable.sym_def_app_icon).into(holder.mImage);
}
@Override
public int getItemCount() {
return mPresenter.getSize();
}
}
MovieCall class
public class ServerMovieCall {
private Retrofit retrofit;
private static ServerMovieCall mInstance;
private Context ctx;
public static ServerMovieCall getInstance() {
if (mInstance == null) {
mInstance = new ServerMovieCall();
}
return mInstance;
}
public ServerMovieCall() {
configureClient();
}
private void configureClient() {
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder().addInterceptor(logging).addInterceptor(new Interceptor() {
@Override
public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
HttpUrl url = request.url().newBuilder().addQueryParameter("api_key", Constants.API_KEY).build();
request = request.newBuilder().url(url).build();
return chain.proceed(request);
}
}).build();
retrofit = new Retrofit.Builder().baseUrl(Constants.API_BASE_URL).client(client)
.addConverterFactory(GsonConverterFactory.create()).build();
}
public void getMovieList(final IOnDataCallback<List<MovieListModel>> onDataCallback) {
IServerMovieApiHelper iMovieReviewApiService = retrofit.create(IServerMovieApiHelper.class);
Call<MovieListResponse> call = iMovieReviewApiService.getMovieList();
call.enqueue(new Callback<MovieListResponse>() {
@Override
public void onResponse(Call<MovieListResponse> call, Response<MovieListResponse> response) {
if (response.isSuccessful()) {
onDataCallback.onSuccess(response.body().getMovies());
} else {
onDataCallback.onFailure(response.message());
}
}
@Override
public void onFailure(Call<MovieListResponse> call, Throwable t) {
onDataCallback.onFailure(t.getLocalizedMessage());
}
});
}
Contract interfaces
public interface IMovieContarctor {
public interface MovieListInteractor {
List<MovieListModel> getMovieList();
MovieListModel getMovie(int pos);
String getMoviePosterPath(int pos);
}
public interface MovieListPresenter {
void bindAtPosition(int position, MovieListViewHolder holder);
String getMoviePosterPath(int pos);
int getSize();
void getData();
}
public interface MovieListView {
void onDataChange(List<MovieListModel> data, String message);
void onDataFailure(String message);
}
}
DataCallback Listener.
public interface IOnDataCallback<T> {
void onSuccess(T data);
void onFailure(String message);
}
