Android Recyclerview Refresh Problem (Firebase Firestore)

Question

I am getting data from Firebase Cloud Firestore to Android Recyclerview.. When i swipe item right to delete item, it deletes item from database but it does not refresh recyclerview! Also same in swipe left too.. Also when i chance data in database recyclerview does not refresh data...

It stays like this..

EDIT & SOLUTION

Deleting .whereEqualTo("tamamlandimi", false) fixed all problems.. So i added array in Firebase and problems solved!!

Hatirlatmalar.java

public class Hatirlatmalar extends Fragment {

    RecyclerView hRVT;
    RCV_HatirlatmalarAdapter hatirlatmalarAdapter;
    FloatingActionButton yEG;
    Button hatirlatmaKaydet;

    TextInputLayout hatirlatmaTarihi, yapilacakIsTipi, kimeYapilacak, yapilacakOlan;
    TextInputEditText hT, yIT;
    Spinner yapilacakIsTipiSpinner;

    ConstraintLayout pBC;

    String hTarihi;

    private DatePickerDialog.OnDateSetListener hatirlatmaTarihiSecici;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View h = inflater.inflate(R.layout.hatirlatmalar, container, false);

        hRVT = h.findViewById(R.id.yapilacaklarTumu);

        hatirlatmalarRefC = fs.collection("Kullanıcılar/" + kullanici.getEmail() + "/Hatırlatmalar");
      
      hatirlatmalarGetir();

        yEG = h.findViewById(R.id.yEG);
        yEG.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                dialog.setContentView(R.layout.hatirlatma_ekle);

                Objects.requireNonNull(dialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

                hatirlatmaKaydet = dialog.findViewById(R.id.yapilacakKaydet);
                hatirlatmaTarihi = dialog.findViewById(R.id.hatirlatmaTarihi);
                yapilacakIsTipi = dialog.findViewById(R.id.yapilacakIsTipi);
                kimeYapilacak = dialog.findViewById(R.id.kimeYapilacak);
                yapilacakOlan = dialog.findViewById(R.id.yapilacakOlan);

                hatirlatmaTarihi.getEditText().setText(bugun);

                hT = dialog.findViewById(R.id.hT);
                yIT = dialog.findViewById(R.id.yIT);
                pBC = dialog.findViewById(R.id.pBC);

                yapilacakIsTipiSpinner = dialog.findViewById(R.id.yapilacakIsTipiSpinner);


                hT.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

                        DatePickerDialog tS = new DatePickerDialog(
                                Objects.requireNonNull(getContext()),
                                android.R.style.Theme_Holo_Dialog_MinWidth,
                                hatirlatmaTarihiSecici,
                                yil, ay, gun);

                        tS.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);
                        Objects.requireNonNull(tS.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

                        tS.show();

                    }
                });

                hatirlatmaTarihiSecici = new DatePickerDialog.OnDateSetListener() {

                    @Override
                    public void onDateSet(DatePicker view, int year, int month, int day) {

                        month += 1;

                        String gun, ay;

                        if (month < 10) {

                            ay = "0" + month;

                        } else {

                            ay = String.valueOf(month);
                        }

                        if (day < 10) {

                            gun = "0" + day;

                        } else {

                            gun = String.valueOf(day);

                        }

                        hTarihi = gun + "." + ay + "." + year;

                        hatirlatmaTarihi.getEditText().setText(hTarihi);

                    }

                };

                ArrayAdapter<CharSequence> b = ArrayAdapter.createFromResource(Objects.requireNonNull(getContext()),
                        R.array.yapilacakIsTipi,
                        R.layout.saga_dayali);
                yapilacakIsTipiSpinner.setAdapter(b);


                yIT.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

                        yapilacakIsTipiSpinner.performClick();

                    }
                });

                yapilacakIsTipiSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                        yapilacakIsTipi.getEditText().setText(yapilacakIsTipiSpinner.getSelectedItem().toString());

                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parent) {
                    }
                });

                hatirlatmaKaydet.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {


                        try {
                            yukleniyorAc();

                            hTarihi = hatirlatmaTarihi.getEditText().getText().toString();

                            Date ht = tarihTipi.parse(hTarihi);
                            Date kt = Calendar.getInstance().getTime();
                            String yo = yapilacakOlan.getEditText().getText().toString().trim();
                            String yit = yapilacakIsTipi.getEditText().getText().toString().trim();
                            String ky = kimeYapilacak.getEditText().getText().toString().trim();

                            if (!yo.trim().isEmpty()) {
                                hatirlatmalarRefC.add(new RCV_Hatirlatmalar(false, kt, ht, yo, yit, ky))
                                        .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                                            @Override
                                            public void onSuccess(DocumentReference documentReference) {

                                                StyleableToast.makeText(getContext(), getString(R.string.hatirlatma_kaydildi), R.style.onayKisaAlt).show();
                                                dialog.dismiss();

                                            // hatirlatmalarGetir(); I'm DOING THIS TO RELOAD RCV!!!

                                            }
                                        }).addOnFailureListener(new OnFailureListener() {
                                    @Override
                                    public void onFailure(@NonNull Exception e) {

                                        StyleableToast.makeText(getContext(), getString(R.string.hatirlatma_kaydlemedi), R.style.hataKisa).show();


                                    }
                                }).addOnCompleteListener(new OnCompleteListener<DocumentReference>() {
                                    @Override
                                    public void onComplete(@NonNull Task<DocumentReference> task) {
                                        yukleniyorKapa();
                                    }
                                });
                            }

                        } catch (ParseException e) {
                            yukleniyorKapa();
                            e.printStackTrace();
                            StyleableToast.makeText(getContext(), getString(R.string.kayityok_tryc), R.style.hataKisa).show();
                        }


                    }
                });

                dialog.show();
            }
        });

        return h;
    }

    private void hatirlatmalarGetir() {


        Query query = hatirlatmalarRefC.whereEqualTo("tamamlandimi", false).orderBy("hatirlatmaTarihi", Query.Direction.DESCENDING);

        FirestoreRecyclerOptions<RCV_Hatirlatmalar> options = new FirestoreRecyclerOptions.Builder<RCV_Hatirlatmalar>()
                .setQuery(query, RCV_Hatirlatmalar.class)
                .build();

        hatirlatmalarAdapter = new RCV_HatirlatmalarAdapter(options);


        hRVT.setHasFixedSize(true);
        hRVT.setLayoutManager(new LinearLayoutManager(getContext()));
        hRVT.setAdapter(hatirlatmalarAdapter);
        hatirlatmalarAdapter.startListening();

        new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT | ItemTouchHelper.LEFT) {
            @Override
            public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
                return false;
            }

            @Override
            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {

                if (direction == ItemTouchHelper.LEFT) {

                    hatirlatmalarAdapter.hatirlatmaTamamla(viewHolder.getAdapterPosition());
                    hatirlatmalarGetir();

                } else {

                    hatirlatmalarAdapter.hatirlatmaSil(viewHolder.getAdapterPosition());
                    hatirlatmalarGetir();

                }


            }


            @Override
            public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {

                new RecyclerViewSwipeDecorator.Builder(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
                        .addSwipeRightActionIcon(R.drawable.ic_sil)
                        .addSwipeLeftActionIcon(R.drawable.ic_tamamlandi)
                        .addSwipeRightBackgroundColor(ContextCompat.getColor(getContext(), R.color.kirmizi))
                        .addSwipeLeftBackgroundColor(ContextCompat.getColor(getContext(), R.color.yesil))
                        .addSwipeRightLabel(getString(R.string.hatirlatma_sil))
                        .addSwipeLeftLabel(getString(R.string.hatirlatma_tamamla))
                        .setSwipeRightLabelColor(ContextCompat.getColor(getContext(), R.color.ak))
                        .setSwipeLeftLabelColor(ContextCompat.getColor(getContext(), R.color.ak))
                        .create()
                        .decorate();

                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            }


        }).attachToRecyclerView(hRVT);


    }


    public void yukleniyorAc() {
        pBC.setVisibility(View.VISIBLE);
    }

    public void yukleniyorKapa() {
        pBC.setVisibility(View.GONE);
    }

    @Override
    public void onStop() {
        super.onStop();
        hatirlatmalarAdapter.stopListening();
    }

    @Override
    public void onStart() {
        super.onStart();
        hatirlatmalarAdapter.startListening();
    }


}

RCV_HatirlatmalarAdapter.java

public class RCV_HatirlatmalarAdapter extends FirestoreRecyclerAdapter<RCV_Hatirlatmalar, RCV_HatirlatmalarAdapter.RCV_Hatirlatmalar_Holder> {

    Context context;

    public RCV_HatirlatmalarAdapter(@NonNull FirestoreRecyclerOptions<RCV_Hatirlatmalar> options) {
        super(options);
    }

   /* @Override
    public int getItemCount() {
        return super.getItemCount();
    }
    */

    @Override
    protected void onBindViewHolder(@NonNull RCV_Hatirlatmalar_Holder holder, int position, @NonNull RCV_Hatirlatmalar model) {

        holder.nezaman.setText(tarihTipi.format(model.getHatirlatmaTarihi()));
        holder.ne.setText(model.getYapilacakOlan());
        holder.kime.setText(model.getKimeYapilacak());
        holder.tip.setText(model.getYapilacakIsTipi());

    }

    @NonNull
    @Override
    public RCV_Hatirlatmalar_Holder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.rcv_hatirlatmalar,
                parent, false);

        context = parent.getContext();

        return new RCV_Hatirlatmalar_Holder(v);
    }


    public void hatirlatmaSil(int adapterPosition) {

        getSnapshots().getSnapshot(adapterPosition).getReference().delete();

        StyleableToast.makeText(context, "Silinidi!", R.style.hataKisaAlt).show();

    }

    public void hatirlatmaTamamla(int adapterPosition) {

        final Map<String, Object> h = new HashMap<>();
        h.put("tamamlandimi", true);

        getSnapshots().getSnapshot(adapterPosition).getReference().set(h, SetOptions.merge()).addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                StyleableToast.makeText(context, "Tamamlandı!", R.style.onayKisaAlt).show();
            }
        });

    }


    class RCV_Hatirlatmalar_Holder extends RecyclerView.ViewHolder {

        TextView nezaman, ne, kime, tip;

        public RCV_Hatirlatmalar_Holder(@NonNull View itemView) {
            super(itemView);
            nezaman = itemView.findViewById(R.id.nezaman);
            ne = itemView.findViewById(R.id.ne);
            kime = itemView.findViewById(R.id.kime);
            tip = itemView.findViewById(R.id.tip);

        }
    }
}

Answer 1

You are not notifying the adapter about data change. You need to call something like notifyDataSetChanged() inside the adapter whenenver data is changing.

or something specific like notifyItemChanged(position) or notifyItemDeleted(position).

More Info about these methods Here, Scroll down to see a complete list of methods depending on the scenario.

In your situation, you need to add this line of code after,

  public void hatirlatmaSil(int adapterPosition) {

    getSnapshots().getSnapshot(adapterPosition).getReference().delete();
    notifyItemRemoved(adapterPosition)  ----> Add This 

    StyleableToast.makeText(context, "Silinidi!", R.style.hataKisaAlt).show();

}