Ndtyjky

Things being invisible inside RVs seem to be a common problem, but I've done tons of searching and can't figure out what's wrong.

I have a fragment that contains a RecyclerView of Adapters. Inside each adapter is another RecyclerView that displays tags or categories (adapters).

When I swipe to refresh the main fragment, the top level of adapters displays fine. But the inside RecyclerView disappears. I am notifying of a data set change, and I have checked to make sure that the data is indeed being sent to the adapter upon refresh (it is).

Before refresh

After refresh

Top level fragment:

public class AdminReportCardsFragment extends Fragment {

RecyclerView rv;

AdminReportCardAdapter adapter;

SwipeRefreshLayout swipeContainer;



//Filter Option Data

private List<String> newCategories;



public AdminReportCardsFragment(){



}



@Override

public View onCreateView(@NonNull LayoutInflater flater, ViewGroup tainer, Bundle savedInstanceState){

    View v = flater.inflate(R.layout.fragment_admin_reportcards, tainer, false);



    adapter = new AdminReportCardAdapter(getContext());



    rv = v.findViewById(R.id.admin_reports_rv);



    adapter.updateReports(Client.reportMap.values());



    rv.setAdapter(adapter);

    LinearLayoutManager llm = new LinearLayoutManager(getContext());

    llm.setOrientation(LinearLayoutManager.VERTICAL);

    rv.setLayoutManager(llm);



    swipeContainer = v.findViewById(R.id.admin_reports_sr);

    swipeContainer.setOnRefreshListener(this::actionSwipeRefresh);



    return v;

}



public void refreshReports() {

    //network stuff, callback is this line

        adapter.updateReports(Client.reportMap.values());

}



private void actionSwipeRefresh() {

    swipeContainer.setRefreshing(true);

    {

        refreshReports();

    }

    if(swipeContainer.isRefreshing())

        swipeContainer.setRefreshing(false);

}

Adapter for top level RV:

public class AdminReportCardAdapter extends RecyclerView.Adapter<AdminReportCardAdapter.ReportViewHolder>{

Context ctx;

List<Report> data;



public AdminReportCardAdapter(Context c){

    ctx = c;

    data = new ArrayList<>();

}



public void updateReports(Collection<Report> c){

    data.clear();

    data.addAll(c);

    notifyDataSetChanged();

}



@NonNull

@Override

public AdminReportCardAdapter.ReportViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(ctx).inflate(R.layout.adapter_reportcard, parent, false);

    ReportViewHolder vh = new ReportViewHolder(v);

    LinearLayoutManager llm = new LinearLayoutManager(ctx);

    llm.setOrientation(LinearLayoutManager.HORIZONTAL);

    vh.catAdapter = new CategoryTagAdapter(false);

    vh.rv.setAdapter(vh.catAdapter);

    vh.rv.setLayoutManager(llm);



    return vh;

}



@Override

public void onBindViewHolder(@NonNull ReportViewHolder holder, int position) {

    Report r = data.get(position);

    holder.tvReportID.setText(r.reportId);

    holder.tvStatus.setText(r.status);

    holder.tvSubmitted.setText(Util.formatTimestamp(r.creationTimestamp));



    holder.catAdapter.updateCategories(r.categories);



    holder.cardContainer.setOnClickListener(v -> {

        Client.activeReport = data.get(holder.getAdapterPosition());

        ctx.startActivity(new Intent(ctx, AdminReportDetailsActivity.class));

    });

}



@Override

public int getItemCount() { return data.size(); }



class ReportViewHolder extends RecyclerView.ViewHolder {

    RecyclerView rv;

    CategoryTagAdapter catAdapter;

    CardView cardContainer;

    TextView tvReportID, tvSubmitted, tvStatus;



    public ReportViewHolder(View v) {

        super(v);

        cardContainer = itemView.findViewById(R.id.reportcard_cv);

        tvReportID = itemView.findViewById(R.id.reportcard_alt_id);

        tvStatus = itemView.findViewById(R.id.reportcard_alt_status);

        tvSubmitted = itemView.findViewById(R.id.reportcard_alt_action);

        rv = itemView.findViewById(R.id.reportcard_rv_categories);

    }

}

}

Lastly, the inside adapter which is mysteriously vanishing...

public class CategoryTagAdapter extends RecyclerView.Adapter<CategoryTagAdapter.CategoryTagViewHolder>{

int layoutID;

private List<String> categoryList;



public CategoryTagAdapter(Boolean isTag){

    categoryList = new ArrayList<>();

    if(!isTag) layoutID = R.layout.adapter_category;

    else layoutID = R.layout.adapter_tag;

}



@NonNull

@Override

public CategoryTagViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(parent.getContext()).inflate(layoutID, parent, false);

    return new CategoryTagViewHolder(v, layoutID);

}



@Override

public void onBindViewHolder(@NonNull CategoryTagViewHolder holder, int position) {

    System.out.println("CAT BIND");

    holder.tv.setText(categoryList.get(position));

}



@Override

public int getItemCount() {

    return categoryList.size();

}



public void updateCategories(Collection<String> c){

    categoryList.clear();

    categoryList.addAll(c);

    notifyDataSetChanged();

}



class CategoryTagViewHolder extends RecyclerView.ViewHolder{

    TextView tv;



    public CategoryTagViewHolder(View itemView, int layoutID){

        super(itemView);

        if(layoutID == R.layout.adapter_category)

            tv = itemView.findViewById(R.id.adapter_alt_category);

        else

            tv = itemView.findViewById(R.id.adapter_alt_tag);

    }

}

My layouts are formatted via ConstraintLayout and I ensured the Recyclerview is bound. Should the secondary Adapter be a variable inside its parent? Or is it in the proper place in the viewholder?