How to refresh RecyclerView after update using Dialog from Adapter

Question

I have apps where the requirement is update & delete the item of RecyclerView using dialog. The dialog will open after click the popup menu

I create the dialog function on Adapter class in onBindViewHolder. The function successfully update and delete the data on server. How do I refresh the RecyclerView after it?

Adapter.java

holder.cBtnMore.setOnClickListener(v -> {
            PopupMenu popupMenu = new PopupMenu(v.getContext(), holder.cBtnMore);
            popupMenu.getMenuInflater().inflate(R.menu.more_menu, popupMenu.getMenu());

            popupMenu.setOnMenuItemClickListener(menuItem -> {
                if (menuItem.getItemId() == R.id.menu_update) {
                    final Dialog dialog = new Dialog(v.getContext());
                    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
                    dialog.setContentView(R.layout.dialog_update);
                    dialog.getWindow().setLayout(Cons.widthScreen, Cons.heightScreen);

                    // Declaration & Set Text
                 ...

                    btnUpdate.setOnClickListener(unused -> {
                        updateBarang(
                                v.getContext(),
                                id,
                                etNama.getText().toString(),
                                etAlamat.getText().toString(),
                                etNoPenjual.getText().toString(),
                                etKodeBarang.getText().toString(),
                                etJumlahPenjualan.getText().toString(),
                                etHargaSatuan.getText().toString(),
                                etDiskon.getText().toString(),
                                etTotalHarga.getText().toString()
                        );
                    });

                    btnCancel.setOnClickListener(unused -> {
                        dialog.dismiss();
                    });

                    dialog.show();
                } else if (menuItem.getItemId() == R.id.menu_delete) {
                    Toast.makeText(v.getContext(), "Delete", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(v.getContext(), "Error", Toast.LENGTH_SHORT).show();
                }

                return true;
            });

            popupMenu.show();
        });

MainActivity.java

public class MainActivity extends AppCompatActivity {

    FloatingActionButton fabAdd;
    RecyclerView rvBarang;
    ApiInterface apiInterface;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        apiInterface = ApiConnection.Connection().create(ApiInterface.class);

        ...

        rvBarang.setLayoutManager(new LinearLayoutManager(this));
    }

    @Override
    protected void onResume() {
        Call<List<Barang>> tampilBarang = apiInterface.listBarang();
        tampilBarang.enqueue(new Callback<List<Barang>>() {
            @Override
            public void onResponse(Call<List<Barang>> call, Response<List<Barang>> response) {
                ArrayList<Barang> barangArrayList = (ArrayList<Barang>) response.body();
                BarangAdapter barangAdapter = new BarangAdapter(barangArrayList);
                rvBarang.setAdapter(barangAdapter);
            }

            @Override
            public void onFailure(Call<List<Barang>> call, Throwable t) {
                // TODO
            }
        });
        super.onResume();
    }
}

Answer 1

If you want to update your recyclerview then you have to update your data source of adapter means list data which you are using in adapter to show and after that you need to notify adapter to refresh

To update recyclerview after delete , add below method in your adapter class

public void deleteItem(int position){
   sourceList.removeAt(position); // updating source
   notifyItemRemoved(position); // notify adapter to refresh 
}

To refresh recyclerview after update , you must have position along with updated object so add below method also in adapter class

public void updateData(int position, Barang updatedObject){
  sourceList.set(position,updatedObject); // updating source
  notifyDataSetChanged(); // notify adapter to refresh
}

after adding above methods , you can just call it to refresh