Вставка строк в RecyclerView последовательно одна за другой

Question

Я пытаюсь вставить динамические строки последовательно в представление переработчика. Я попытался использовать обработчик, но он не загружается один за другим, а отображает все данные за один раз.

Это код, где я установил адаптер во фрагмент

 public class HolidayFragment extends Fragment implements IHolidayView {

@BindView(R.id.list)
RecyclerView recyclerView;
@BindView(R.id.adView)
AdView adView;
private HolidayAdapter adapter;
private HolidayPresenter presenter;
private Handler handler = new Handler();

public HolidayFragment() {
    // Required empty public constructor
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_holiday, container, false);
    ButterKnife.bind(this, view);
    setMObileAdMobAdView();
    presenter = new HolidayPresenter(this);
    presenter.getHolidayList(getActivity());
    return view;
}

private void setMObileAdMobAdView() {
    AdView adView = new AdView(getActivity());
    adView.setAdSize(AdSize.BANNER);
    adView.setAdUnitId(getResources().getString(R.string.adUnitId));
    AdRequest request = new AdRequest.Builder()
            .addTestDevice(Utility.getDeviceId(getActivity()))
            .build();
    adView.loadAd(request);
}


@OnClick(R.id.imgBack)
public void openDashboard() {
    Intent intent = new Intent(getActivity(), MainActivity.class);
    startActivity(intent);
    getActivity().overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
}

@Override
public void onDetach() {
    super.onDetach();
}

@Override
public void onSuccess(final List<Holidays> holidays) {
    adapter = new HolidayAdapter(getActivity());
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(mLayoutManager);
    recyclerView.setAdapter(adapter);
    for (final Holidays holiday : holidays) {
        adapter.addItems(holiday);
        handler.postDelayed(new Runnable() {
            public void run() {

            }
        }, 3000);
    }
}

@Override
public void onError(String errorMessage) {
    Utility.showErrorMessage(getActivity(), errorMessage);
}

}

Ниже приведен код адаптера, где метод addItem в адаптере используется для обновления данных в списке.

public class HolidayAdapter extends RecyclerView.Adapter<HolidayAdapter.ViewHolder> {

private List<Holidays> holidays = new ArrayList<>();
private Context context;
// Allows to remember the last item shown on screen
private int mExpandedPosition = -1;
private int previousExpandedPosition = -1;

public HolidayAdapter(Context context) {
    this.context = context;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.holiday_list_row, parent, false);
    return new ViewHolder(v);
}

//METHOD WHICH WILL HANDLE DYNAMIC INSERTION
public void addItems(final Holidays object) {
    holidays.add(object);
    notifyDataSetChanged();
}

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    Holidays holiday = holidays.get(position);

    // Set default view
    holder.txtName.setText(holiday.getTitle());
    holder.txtDate.setText(Utility.getFormattedDateWithSuffix(Utility.formatDate(holiday.getDate())));

    // set expanded view
    final boolean isExpanded = holder.getAdapterPosition() == mExpandedPosition;
    holder.expandedLayout.setVisibility(isExpanded ? View.VISIBLE : View.GONE);
    holder.expandedLayout.setActivated(isExpanded);
    if (isExpanded)
        previousExpandedPosition = holder.getAdapterPosition();

    // Here you apply the animation when the view is bound
    if (mExpandedPosition == holder.getAdapterPosition()) {
        setAnimationForExpandedView(holder.parentLayout, holder.getAdapterPosition());
    } else if (mExpandedPosition != previousExpandedPosition) {
        resetAnimation(holder.parentLayout, holder.getAdapterPosition());
    } else {
        setAnimationForCollapsedView(holder.parentLayout, holder.getAdapterPosition());
    }

    if (holiday.getImage() == null || holiday.getImage().isEmpty()) {
        Picasso.get()
                .load(R.drawable.ic_profile_placeholder)
                .centerCrop()
                .transform(new RoundImage())
                .resize(100, 100)
                .into(holder.img);
    } else {
        Picasso.get()
                .load(holiday.getImage())
                .centerCrop()
                .transform(new RoundImage())
                .resize(100, 100)
                .into(holder.img);
    }

    holder.description.setText(holiday.getDescription());

    holder.rootLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mExpandedPosition = isExpanded ? -1 : position;
            notifyItemChanged(previousExpandedPosition);
            notifyItemChanged(position);
        }
    });
}

private void setAnimationForCollapsedView(final View viewToAnimate, int position) {
    // If the bound view wasn't previously displayed on screen, it's animated
    Animation animation = AnimationUtils.loadAnimation(context, R.anim.bottom_up);
    viewToAnimate.startAnimation(animation);
}

private void setAnimationForExpandedView(final View viewToAnimate, int position) {
    // If the bound view wasn't previously displayed on screen, it's animated
    Animation animation = AnimationUtils.loadAnimation(context, R.anim.slide_down);
    viewToAnimate.startAnimation(animation);
}

private void resetAnimation(final View viewToAnimate, int position) {
    // If the bound view wasn't previously displayed on screen, it's animated
    Animation animation = AnimationUtils.loadAnimation(context, R.anim.slide_in_left);
    viewToAnimate.startAnimation(animation);
}

@Override
public int getItemCount() {
    return holidays.size();
}

public static class ViewHolder extends RecyclerView.ViewHolder {

    @BindView(R.id.parentLayout)
    CardView parentLayout;
    @BindView(R.id.expandedLayout)
    LinearLayout expandedLayout;
    @BindView(R.id.rootLayout)
    LinearLayout rootLayout;
    @BindView(R.id.thumb_img)
    AppCompatImageView img;
    @BindView(R.id.description)
    AppCompatTextView description;
    @BindView(R.id.txtName)
    AppCompatTextView txtName;
    @BindView(R.id.txtDate)
    AppCompatTextView txtDate;

    public ViewHolder(View itemView) {
        super(itemView);
        ButterKnife.bind(this, itemView);
    }
}

}

Answer 1

Ваш адаптер использует holidaysList

adapter = new HolidayAdapter(getActivity(), holidaysList);

и вы устанавливаете его перед началом цикла:

recyclerView.setAdapter(adapter);

Затем цикл добавляет элементы в другой список под названием праздничные дни:

holidays.add(object);

а также notifyDataSetChanged(); не влияет на адаптер

То, что вы делаете, никак не влияет на представление о переработчике.
Если вы разместите свой полный код, может быть, есть решение