Getting wrong position on RecyclerView

Getting wrong position on RecyclerView - java

I am trying to get the position of the item in a recycler view in order to pass it down to other activities, but after actually managing to get the item id, I found out that I'm getting a -1, therefore not getting a correct id there. What could be causing this?
The activity:
package com.gmproxy.pastilarma;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.SearchView;
import android.widget.Toast;
import androidx.recyclerview.*;
import com.gmproxy.Adapters.PathologyListAdapter;
import com.gmproxy.Adapters.PathologyViewHolder;
import com.gmproxy.DAO.PathologyDAO;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.Util.PathologyViewModel;
public class PathologiesSearchScreen extends AppCompatActivity {
private PathologyViewModel viewModel;
SearchView searchView;
RecyclerView recyclerView;
private PathologyDAO pathDao;
private Pathology pathology;
private PathologyViewHolder holder;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pathology_search_list);
searchView = findViewById(R.id.SearchView);
recyclerView = findViewById(R.id.recyclerview);
final PathologyListAdapter adapter = new PathologyListAdapter(new PathologyListAdapter.UserDiff());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
viewModel = new ViewModelProvider(this).get(PathologyViewModel.class);
viewModel.pathologies.observe(this, adapter::submitList);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
viewModel.setFilter(searchView.getQuery().toString());
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
long start;
start = System.currentTimeMillis();
if ((newText.length() > 3) && (System.currentTimeMillis() - start > 500)) {
viewModel.setFilter(searchView.getQuery().toString());
}
return false;
}
});
recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
#Override
public boolean onInterceptTouchEvent(#NonNull #org.jetbrains.annotations.NotNull RecyclerView rv, #NonNull #org.jetbrains.annotations.NotNull MotionEvent e) {
pathology = getSelectedPathology(findViewById(R.id.recyclerview));
Log.println(Log.INFO, "PathologyTest", pathology.toString());
final CharSequence[] options = {"Si", "No"};
AlertDialog.Builder builder = new AlertDialog.Builder(PathologiesSearchScreen.this);
builder.setTitle("¿Añadir la patología " + pathology.getPathologyName() + "?");
builder.setItems(options, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int item) {
if (options[item].equals("Si")) {
Toast.makeText(PathologiesSearchScreen.this, "Has añadido la patología " + pathology.getPathologyName() + ".", Toast.LENGTH_SHORT).show();
Intent mainAct = new Intent(PathologiesSearchScreen.this, UserAddScreen.class);
mainAct.putExtra("path", pathology);
} else if (options[item].equals("No")) {
dialog.dismiss();
}
}
});
builder.show();
return true;
}
#Override
public void onTouchEvent(#NonNull #org.jetbrains.annotations.NotNull RecyclerView rv, #NonNull #org.jetbrains.annotations.NotNull MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
}
public Pathology getSelectedPathology(View v){
holder = new PathologyViewHolder(v);
long idlongo = recyclerView.getAdapter().getItemId(holder.getAdapterPosition());
Log.println(Log.INFO, "PathologyTest", String.valueOf(idlongo));
int id = (int) idlongo;
Pathology path = pathDao.findObjectbyId(id);
return path;
}
}
The view holder:
package com.gmproxy.Adapters;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import android.widget.Toast;
import androidx.recyclerview.widget.RecyclerView;
import com.gmproxy.DAO.PathologyDAO;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.pastilarma.PathologiesSearchScreen;
import com.gmproxy.pastilarma.R;
import java.nio.file.Path;
public class PathologyViewHolder extends RecyclerView.ViewHolder {
public final TextView objItemView;
public PathologyViewHolder(View itemView) {
super(itemView);
objItemView = itemView.findViewById(R.id.textView);
}
public void bind(String text) {
objItemView.setText(text);
}
static PathologyViewHolder create(ViewGroup parent) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.pathologies_item, parent, false);
return new PathologyViewHolder(view);
}
}
The list adapter:
package com.gmproxy.Adapters;
import android.content.DialogInterface;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.ListAdapter;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.pastilarma.PathologiesSearchScreen;
import com.gmproxy.pastilarma.UserAddScreen;
public class PathologyListAdapter extends ListAdapter<Pathology, PathologyViewHolder> {
public PathologyListAdapter(#NonNull DiffUtil.ItemCallback<Pathology> diffCallback) {
super(diffCallback);
}
#Override
public PathologyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return PathologyViewHolder.create(parent);
}
#Override
public void onBindViewHolder(PathologyViewHolder holder, int position) {
Pathology current = getItem(position);
holder.bind(current.getPathologyName());
}
public static class UserDiff extends DiffUtil.ItemCallback<Pathology> {
#Override
public boolean areItemsTheSame(#NonNull Pathology oldItem, #NonNull Pathology newItem) {
return oldItem == newItem;
}
#Override
public boolean areContentsTheSame(#NonNull Pathology oldItem, #NonNull Pathology newItem) {
return oldItem.getPathologyName().equals(newItem.getPathologyName());
}
}
}
The entity DAO:
package com.gmproxy.DAO;
import androidx.lifecycle.LiveData;
import androidx.room.*;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.Entities.User;
import java.util.List;
#Dao
public interface PathologyDAO {
#Query("SELECT * FROM condiciones")
LiveData<List<Pathology>> getAllObjects();
//This will come in handy for getting all those pathologies, will need to get them on a for loop since I'm not completely sure
//that the query will handle int[]
#Query("SELECT id_condiciones FROM condiciones WHERE id_condiciones LIKE :id_condiciones")
int getPathologiesForUser(int id_condiciones);
#Query("SELECT nombreCondicion FROM condiciones WHERE nombreCondicion LIKE :pathologyName")
String getPathologiesForName(String pathologyName);
#Query("SELECT * FROM condiciones WHERE nombreCondicion LIKE :pathologyName")
Pathology getPathologiesCompleteForName(String pathologyName);
#Query("SELECT * FROM condiciones WHERE id_condiciones = :id")
Pathology findObjectbyId(int id);
#Query("SELECT * FROM condiciones WHERE nombreCondicion LIKE '%' || :filter || '%'")
LiveData<List<Pathology>> filterText(String filter);
#Insert(onConflict = OnConflictStrategy.REPLACE)
void insertAllObjects(List<Pathology> listObjects);
#Insert(onConflict = OnConflictStrategy.REPLACE)
void insertObject(Pathology object);
#Update
void updateObject(Pathology object);
#Delete
void delete(Pathology obj);
}
The entity repository:
package com.gmproxy.DAO;
import android.app.Application;
import android.os.AsyncTask;
import androidx.lifecycle.LiveData;
import com.gmproxy.Entities.Pathology;
import com.gmproxy.Entities.User;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class PathologyRepository {
private PathologyDAO concerningDao;
private LiveData<List<Pathology>> pathologyList;
public PathologyRepository(Application application) {
DatabaseHelper db = DatabaseHelper.getDatabase(application);
concerningDao = db.pathologyDao();
pathologyList = concerningDao.getAllObjects();
}
public LiveData<List<Pathology>> getAllObjects() {
return concerningDao.getAllObjects();
}
void insertAllObjects(List<Pathology> objectsList) {
DatabaseHelper.databaseWriteExecutor.execute(() ->{
concerningDao.insertAllObjects(objectsList);
});
}
public void insertObject(Pathology obj){
DatabaseHelper.databaseWriteExecutor.execute(() ->{
concerningDao.insertObject(obj);
});
}
public void deleteObject(Pathology obj) {
concerningDao.delete(obj);
}
public LiveData<List<Pathology>> filter(String input){
try{
return new FilterNoteAsyncTask(concerningDao).execute(input).get();
} catch (ExecutionException | InterruptedException e) {
e.printStackTrace();
}
return null;
}
private static class FilterNoteAsyncTask extends AsyncTask<String, Void, LiveData<List<Pathology>>> {
private PathologyDAO pathologyDAO;
private FilterNoteAsyncTask(PathologyDAO pathologyDAO) {
this.pathologyDAO = pathologyDAO;
}
#Override
protected LiveData<List<Pathology>> doInBackground(String... strings) {
return pathologyDAO.filterText(strings[0]);
}
}
}

Move your PathologyListAdapter to global, and get adapter position using adapter object instead of getting adapter from recyclerview.
public Pathology getSelectedPathology(){
long idlongo = adapter.getAdapterPosition();
Log.println(Log.INFO, "PathologyTest", String.valueOf(idlongo));
int id = (int) idlongo;
Pathology path = pathDao.findObjectbyId(id);
return path;
}

Related

android tablayout+viewPager2+recyclerView question，onTabSelected will repeated execution?

description:
the page have 4 tabs, when i first open the page. The getOrders(null, type) function will run once, type='all',
when i slip to the second,third or forth tab, The getOrders(null, type) function always will run twice, type='all' and type='paid' | 'settled' | 'invalid',
but then when i slip back, The getOrders(null, type) function always run once, and the type is correct.It is very strange，i want the getOrders always run once.
and when i do not slip but clcik the top tab,the getOrders(null, type) run normal. I need some help
the code is below
// activity
package com.sugar.sugarmall.app.pages.order;
import android.content.Context;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentTransaction;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import androidx.viewpager2.widget.ViewPager2;
import com.alibaba.android.arouter.facade.annotation.Route;
import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;
import com.sugar.sugarmall.app.R;
import com.sugar.sugarmall.app.adapter.OrderViewPagerAdapter;
import com.sugar.sugarmall.app.base.BaseActivity;
import com.sugar.sugarmall.app.config.Router;
import com.sugar.sugarmall.app.pages.mine.FragmentSetting;
import java.util.ArrayList;
import java.util.Arrays;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
#Route(path = Router.ORDER_LIST)
public class OrderActivity extends BaseActivity {
#BindView(R.id.orderPage)
ViewPager2 viewPager2;
#BindView(R.id.tabLayout)
TabLayout tabLayout;
#BindView(R.id.tv_left)
TextView backBtn;
#BindView(R.id.tv_title)
TextView topTitle;
#BindView(R.id.tv_right)
TextView topRight;
#BindView(R.id.bg_head)
LinearLayout topBox;
#BindView(R.id.topSearchCenterView)
EditText topSearchCenterView;
private final ArrayList<String> tabTitles = new ArrayList<>(Arrays.asList("全部", "已付款", "已结算", "已失效"));
private String topType = "title";
private Context context;
#Override
protected void initUI() {
setContentView(R.layout.order);
ButterKnife.bind(this);
context = getApplication();
OrderViewPagerAdapter orderViewPagerAdapter = new OrderViewPagerAdapter(this, context);
viewPager2.setAdapter(orderViewPagerAdapter);
viewPager2.setUserInputEnabled(false);
new TabLayoutMediator(tabLayout, viewPager2, new TabLayoutMediator.TabConfigurationStrategy() {
#Override
public void onConfigureTab(#NonNull TabLayout.Tab tab, int i) {
tab.setText(tabTitles.get(i));
}
}).attach();
viewPager2.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
super.onPageScrolled(position, positionOffset, positionOffsetPixels);
}
#Override
public void onPageSelected(int position) {
super.onPageSelected(position);
}
#Override
public void onPageScrollStateChanged(int state) {
super.onPageScrollStateChanged(state);
}
});
backBtn.setVisibility(View.VISIBLE);
topTitle.setVisibility(View.VISIBLE);
topRight.setVisibility(View.VISIBLE);
topTitle.setText("订单明细");
topRight.setText("搜索");
}
#OnClick({R.id.tv_left, R.id.tv_right})
public void onClick(View view) {
switch (view.getId()) {
case R.id.tv_left:
onBackPressed();
break;
case R.id.tv_right:
if (topType.equals("title")) {
topTitle.setVisibility(View.GONE);
topSearchCenterView.setVisibility(View.VISIBLE);
topType = "search";
}
break;
}
if (topType.equals("title")) {
topTitle.setVisibility(View.GONE);
topSearchCenterView.setVisibility(View.VISIBLE);
topType = "search";
}
}
#Override
protected void initData() {
}
#Override
protected void initListener() {
}
}
// OrderViewPagerAdapter
package com.sugar.sugarmall.app.adapter;
import android.content.Context;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.google.android.material.tabs.TabLayout;
import com.sugar.sugarmall.app.pages.order.FragmentOrder;
import com.sugar.sugarmall.model.bean.ItemOrderBean;
import java.util.ArrayList;
public class OrderViewPagerAdapter extends FragmentStateAdapter {
private String searchType = "";
private ArrayList<ItemOrderBean> orderList = new ArrayList<>();
private int pageNo = 1;
private Context context;
private FragmentOrder fragmentOrder = new FragmentOrder("all");
private TabLayout tabLayout;
public OrderViewPagerAdapter(#NonNull FragmentActivity fragmentActivity, Context context) {
super(fragmentActivity);
this.context = context;
}
#NonNull
#Override
public Fragment createFragment(int i) {
switch (i) {
case 0:
searchType = "all";
break;
case 1:
searchType = "paid";
break;
case 2:
searchType = "settled";
break;
default:
searchType = "invalid";
break;
}
System.out.println("-----createFragment" + searchType);
return new FragmentOrder(searchType);
}
#Override
public long getItemId(int position) {
return super.getItemId(position);
}
#Override
public boolean containsItem(long itemId) {
return super.containsItem(itemId);
}
#Override
public int getItemCount() {
return 4;
}
}
// FragmentOrder
package com.sugar.sugarmall.app.pages.order;
import static com.sugar.sugarmall.config.ResStatusCode.STATUS_OK;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager2.widget.ViewPager2;
import com.google.android.material.tabs.TabLayout;
import com.sugar.sugarmall.app.R;
import com.sugar.sugarmall.app.adapter.ItemOrderAdapter;
import com.sugar.sugarmall.app.base.BaseLazyFragment;
import com.sugar.sugarmall.app.base.DefaultObserver;
import com.sugar.sugarmall.https.ApiManger;
import com.sugar.sugarmall.https.CheckResponse;
import com.sugar.sugarmall.https.response.OrderResponse;
import com.sugar.sugarmall.model.bean.ItemOrderBean;
import com.sugar.sugarmall.utils.RxTools;
import com.sugar.sugarmall.utils.T;
import java.util.ArrayList;
import butterknife.BindView;
import butterknife.ButterKnife;
public class FragmentOrder extends BaseLazyFragment {
#BindView(R.id.fragmentOrderList)
RecyclerView fragmentOrderList;
private ViewPager2 viewPager2;
private ArrayList<ItemOrderBean> orderList = new ArrayList<>();
private int pageNo = 1;
private String type = "all";
private ItemOrderAdapter itemOrderAdapter;
private TabLayout tabLayout;
private Context context;
private String[] typeArr = new String[]{"all", "paid", "settled", "invalid"};
public FragmentOrder(String type) {
this.type = type;
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_order, container, false);
ButterKnife.bind(this, view);
context = getContext();
tabLayout = (TabLayout) getActivity().findViewById(R.id.tabLayout);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
linearLayoutManager.setOrientation(RecyclerView.VERTICAL);
fragmentOrderList.setLayoutManager(linearLayoutManager);
viewPager2 = getActivity().findViewById(R.id.orderPage);
itemOrderAdapter = new ItemOrderAdapter(orderList);
fragmentOrderList.setAdapter(itemOrderAdapter);
tabLayout.removeAllTabs();
tabLayout.clearOnTabSelectedListeners();
tabLayout.addTab(tabLayout.newTab().setText("all"));
tabLayout.addTab(tabLayout.newTab().setText("paid"));
tabLayout.addTab(tabLayout.newTab().setText("settled"));
tabLayout.addTab(tabLayout.newTab().setText("invalid"));
TabLayout.OnTabSelectedListener onTabSelectedListener = new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
System.out.println("-----pageScroll4" + tab.getPosition());
String type = typeArr[tab.getPosition()];
getOrders(null, type); // type:"all" | "paid" | "settled" | "invalid"
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
};
onTabSelectedListener.onTabSelected(tabLayout.getTabAt(tabLayout.getSelectedTabPosition()));
tabLayout.setOnTabSelectedListener(onTabSelectedListener);
return view;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
#Override
protected void lazyload() {
}
public void getOrders(String searchKey, String type) {
RxTools.setSubscribe(ApiManger.sugarApi().getOrderList(type, pageNo, searchKey), new DefaultObserver<OrderResponse>() {
#Override
public void onNext(#io.reactivex.rxjava3.annotations.NonNull OrderResponse orderResponse) {
CheckResponse.checkResponse(orderResponse);
orderList.clear();
if (orderResponse.code != STATUS_OK) {
T.showShort(getContext(), orderResponse.msg);
}
orderList.addAll(orderResponse.data);
itemOrderAdapter.notifyDataSetChanged();
}
#Override
public void onError(#Nullable #io.reactivex.rxjava3.annotations.NonNull Throwable e) {
super.onError(e);
}
});
}
}

Calculating Price * Quantity from Adapter to Total Price from Activity

I want to get total price in Activity from Price and Quantity in Adapter, it's mean like qty * price = total_price.
Here is my Adapter for handling the list of Items Activity:
package com.example.aulaherbalfinal.Adapter;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.aulaherbalfinal.Model.DataModel;
import com.example.aulaherbalfinal.R;
import java.text.NumberFormat;
import java.util.List;
import java.util.Locale;
public class AdapterDataPembelian extends RecyclerView.Adapter<AdapterDataPembelian.HolderDataPembelian>{
private Context ctx;
private List<DataModel> listDataPembelian;
private int count;
public AdapterDataPembelian(Context ctx, List<DataModel> listDataPembelian) {
this.ctx = ctx;
this.listDataPembelian = listDataPembelian;
}
#NonNull
#Override
public HolderDataPembelian onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View layout = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_item_pembelian, parent, false);
HolderDataPembelian holder = new HolderDataPembelian(layout);
return holder;
}
#Override
public void onBindViewHolder(#NonNull HolderDataPembelian holder, int position) {
DataModel dm = listDataPembelian.get(position);
holder.tvId.setText(String.valueOf(dm.getId()));
holder.tvBarang.setText(dm.getBarang());
holder.tvStok.setText("Stok : "+String.valueOf(dm.getStok()));
holder.tvHarga.setText(formatRupiah(Double.parseDouble(String.valueOf(dm.getHarga()))));
holder.jmlBarang.setText(String.valueOf(dm.getQuantity()));
//holder.totalHarga.setText(String.valueOf(dm.getTotalHarga()));
Intent intent = new Intent("custom-message");
holder.btnRemove.setOnClickListener(v -> {
minusCartItem(holder,listDataPembelian.get(position));
});
holder.btnAdd.setOnClickListener(v -> {
plusCartItem(holder,listDataPembelian.get(position));
});
}
private void plusCartItem(HolderDataPembelian holder, DataModel dataModel) {
dataModel.setQuantity(dataModel.getQuantity()+1);
//dataModel.setTotalHarga(Integer.parseInt(String.valueOf(dataModel.getQuantity()*Double.parseDouble(String.valueOf(dataModel.getHarga())))));
holder.jmlBarang.setText(new StringBuilder().append(dataModel.getQuantity()));
}
private void minusCartItem(HolderDataPembelian holder, DataModel dataModel) {
if (dataModel.getQuantity() > 0){
dataModel.setQuantity(dataModel.getQuantity()-1);
//dataModel.setTotalHarga(Integer.parseInt(String.valueOf(dataModel.getQuantity()*Double.parseDouble(String.valueOf(dataModel.getHarga())))));
holder.jmlBarang.setText(new StringBuilder().append(dataModel.getQuantity()));
} else {
holder.jmlBarang.setText("0");
}
}
#Override
public int getItemCount() {
return listDataPembelian.size();
}
public class HolderDataPembelian extends RecyclerView.ViewHolder {
TextView tvId, tvBarang, tvStok, tvHarga;
Button btnAdd, btnRemove;
TextView jmlBarang, totalHarga;
public HolderDataPembelian(#NonNull View itemView) {
super(itemView);
tvId = itemView.findViewById(R.id.tv_id);
tvBarang = itemView.findViewById(R.id.tv_barang);
tvStok = itemView.findViewById(R.id.tv_stok);
tvHarga = itemView.findViewById(R.id.tv_harga);
btnAdd = itemView.findViewById(R.id.btn_add);
btnRemove = itemView.findViewById(R.id.btn_remove);
jmlBarang = itemView.findViewById(R.id.jml_barang);
totalHarga = itemView.findViewById(R.id.total_harga);
}
}
private String formatRupiah(Double number){
Locale localeID = new Locale("IND", "ID");
NumberFormat numberFormat = NumberFormat.getCurrencyInstance(localeID);
String formatRupiah = numberFormat.format(number);
String[] split = formatRupiah.split(",");
int length = split[0].length();
return split[0].substring(0,2)+". "+split[0].substring(2,length);
}
public int getTotalPrice(){
int totalPrice = 0;
for (int i=0 i<listDataPembelian.size(); i++){
}
}
}
And here is my Activity
package com.example.aulaherbalfinal.Activity;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.cardview.widget.CardView;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.example.aulaherbalfinal.API.APIRequestData;
import com.example.aulaherbalfinal.API.RetroServer;
import com.example.aulaherbalfinal.Adapter.AdapterDataPembelian;
import com.example.aulaherbalfinal.Model.DataModel;
import com.example.aulaherbalfinal.Model.ResponseModel;
import com.example.aulaherbalfinal.R;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import java.util.ArrayList;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class PembelianActivity extends AppCompatActivity {
private RecyclerView rvData;
private RecyclerView.Adapter adData;
private RecyclerView.LayoutManager lmData;
private List<DataModel> listDataPembelian = new ArrayList<>();
private SwipeRefreshLayout srlData;
private ProgressBar pbData;
private TextView totalHarga;
private EditText jmlBarang;
#SuppressLint("ClickableViewAccessibility")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pembelian);
rvData = findViewById(R.id.rv_data);
lmData = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
rvData.setLayoutManager(lmData);
srlData = findViewById(R.id.srl_data);
pbData = findViewById(R.id.pb_data);
totalHarga = findViewById(R.id.total_harga);
jmlBarang = findViewById(R.id.jml_barang);
totalHarga = findViewById(R.id.total_harga);
//retrieveData();
CardView cvTotal = findViewById(R.id.cv_total);
rvData.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE){
cvTotal.setVisibility(View.INVISIBLE);
}
if (event.getAction() == MotionEvent.ACTION_UP){
cvTotal.setVisibility(View.VISIBLE);
}
return false;
}
});
BottomNavigationView bottom_navigation = findViewById(R.id.bottom_navigation);
bottom_navigation.setItemIconTintList(null);
bottom_navigation.setSelectedItemId(R.id.navigation_pembelian);
ImageView profile =findViewById(R.id.profile);
profile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(PembelianActivity.this, ProfileActivity.class);
startActivity(intent);
finish();
}
});
bottom_navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch ( (item.getItemId())){
case R.id.navigation_stok:
startActivity(new Intent(getApplicationContext(), MainActivity.class));
overridePendingTransition(0, 0);
return true;
case R.id.navigation_pembelian:
return true;
case R.id.navigation_penjualan:
startActivity(new Intent(getApplicationContext(), PenjualanActivity.class));
overridePendingTransition(0, 0);
return true;
}
return false;
}
});
srlData.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
srlData.setRefreshing(true);
retrieveData();
srlData.setRefreshing(false);
}
});
}
#Override
protected void onResume() {
super.onResume();
retrieveData();
}
public void retrieveData(){
pbData.setVisibility(View.VISIBLE);
APIRequestData ardData = RetroServer.konekRetrofit().create(APIRequestData.class);
Call<ResponseModel> tampildata = ardData.ardRetrieveData();
tampildata.enqueue(new Callback<ResponseModel>() {
#Override
public void onResponse(Call<ResponseModel> call, Response<ResponseModel> response) {
int kode = response.body().getKode();
String pesan = response.body().getPesan();
//Toast.makeText(MainActivity.this, "Kode : "+kode+" | Pesan : "+pesan, Toast.LENGTH_SHORT).show();
listDataPembelian = response.body().getData();
adData = new AdapterDataPembelian(PembelianActivity.this, listDataPembelian);
rvData.setAdapter(adData);
adData.notifyDataSetChanged();
pbData.setVisibility(View.INVISIBLE);
}
#Override
public void onFailure(Call<ResponseModel> call, Throwable t) {
Toast.makeText(PembelianActivity.this, "Gagal Menghubungi Server", Toast.LENGTH_SHORT).show();
pbData.setVisibility(View.INVISIBLE);
}
});
}
}
Here is my app

I would do something like this:
Create an Interface for your activity to implement:
public interface CallbackIF {
double tally(double amount, int quantity)
}
public class PembelianActivity extends AppCompatActivity implements CallbackIF {
#Override
public double tally(double amount, int quantity) {
return amount * quantity;
}
}
Then when you initialize your recyclerview adapter pass in the interface like so:
adData = new AdapterDataPembelian(PembelianActivity.this, listDataPembelian, PembelianActivity.this);
And change your constructor for the data adapter to be
private CallbackIF callback;
public AdapterDataPembelian(Context ctx, List<DataModel> listDataPembelian, CallbackIF callback) {
this.ctx = ctx;
this.listDataPembelian = listDataPembelian;
this.callback = callback;
}
Then in your onClicklistener for your list / wherever you want to trigger a tally just call
double value = callback.tally(amount, quantity);
If you have any questions please ask

how to get the post key with position in Firebase Android

package com.novela.minha.novela;
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.client.Firebase;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter<MyHolder> {
Context c;
ArrayList<Beaches> beaches;
private long itemId;
private Firebase firebase;
Firebase likeRef;
FirebaseAuth user;
public com.firebase.client.Firebase Ref ;
private DatabaseReference Database = FirebaseDatabase.getInstance().getReference();
private DatabaseReference mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
private boolean mProcessLike = false;
public MyAdapter(Context c, ArrayList<Beaches> beaches){
this.c= c;
this.beaches=beaches;
}
#Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.card,parent,false);
final MyHolder holder= new MyHolder(v);
return holder;
}
#Override
public void onBindViewHolder(final MyHolder holder, final int position) {
final String post_key = Database.getRef(position).getKey().toString(); // <- Error
mDatabaseLike.keepSynced(true);
holder.nameTxt.setText(beaches.get(position).getName());
holder.textoTxt.setText(beaches.get(position).getTexto());
holder.siteTxt.setText(beaches.get(position).getSite());
holder.emissoraTxt.setText(beaches.get(position).getEmissora());
holder.enderecoTxt.setText(beaches.get(position).getEndereco());
PicassoClient.downloadimg(c, beaches.get(position).getUrl(),holder.img);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String url = beaches.get(position).getEndereco().toString();
Intent intent = new Intent( v.getContext().getApplicationContext(), Web.class);
intent.putExtra("VALOR", url);
v.getContext().getApplicationContext().startActivity(intent);
}
});
holder.like.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(final View v) {
Toast.makeText(v.getContext(), post_key, Toast.LENGTH_SHORT).show();
mProcessLike = true ;
if (mProcessLike) {
mDatabaseLike.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
});
}
#Override
public int getItemCount() {
return beaches.size();
}
}
Note that getRef does not accept position,
returns an error, which could be done in the code, I already searched here in the Forum but I did not find a solution, thank you ,Note that getRef does not accept position,
returns an error, which could be done in the code, I already searched here in the Forum
 but I did not find a solution, I'm new to programming, thank you

final String post_key = Database.push().getKey();

Blank Screen Shows after search from database (Android)

When i tap search donor then it shows blank screen in listview i don't know why This is the response that i get back from server
This is my custom adapter code:
package com.example.kamran.ebloodbank;
import android.app.Activity;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
/**
* Created by Kamran on 4/12/2017.
*/
public class DonorAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<DataSet> donorItems;
public DonorAdapter(Activity activity,List<DataSet> donorItems) {
this.activity = activity;
this.donorItems = donorItems;
}
#Override
public int getCount() {
return donorItems.size();
}
#Override
public Object getItem(int location) {
return donorItems.get(location);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.donor_search_list_theme, null);
TextView nameTextView = (TextView) convertView.findViewById(R.id.donor_name);
TextView areaTextView = (TextView) convertView.findViewById(R.id.donor_area);
DataSet d = donorItems.get(position);
nameTextView.setText(d.getName());
areaTextView.setText(d.getArea());
return convertView;
}
}
This is my model code:
package com.example.kamran.ebloodbank;
import android.widget.ArrayAdapter;
import java.util.ArrayList;
/**
* Created by Kamran on 4/12/2017.
*/
public class DataSet {
private String name;
private int area;
public void setArea(int area) {
this.area = area;
}
public void setName(String name) {
this.name = name;
}
public int getArea() {
return area;
}
public String getName() {
return name;
}
}
This is my first activity code:
package com.example.kamran.ebloodbank;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Spinner;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.example.kamran.ebloodbank.data.BloodContract.BloodEntry;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class FindDonor extends AppCompatActivity {
Spinner bloodgroup;
Spinner area;
String findDonorUrl = "https://wwwkamranalitk.000webhostapp.com/findDonor.php";
int mBlood = BloodEntry.BLOOD_GROUP_A_POS;
int mArea = BloodEntry.DONOR_AREA_MALIR;
Button searchButton;
RequestQueue requestQueue;
StringRequest request;
JSONObject jsonObject;
JSONArray result;
private List<DataSet> donorList = new ArrayList<DataSet>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_find_donor);
bloodgroup = (Spinner) findViewById(R.id.bloodspinnerfinddonor);
area = (Spinner) findViewById(R.id.areaSpinner);
searchButton = (Button) findViewById(R.id.searchDonor);
setupSpinnerBlood();
setupSpinnerArea();
requestQueue = Volley.newRequestQueue(getApplicationContext());
searchButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
request = new StringRequest(Request.Method.POST, findDonorUrl, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
jsonObject = new JSONObject(response);
result = jsonObject.getJSONArray("result");
JSONObject donorData = result.getJSONObject(0);
DataSet donorSet = new DataSet();
donorSet.setName(donorData.getString("name"));
donorSet.setArea(donorData.getInt("area"));
donorList.add(donorSet);
Intent intent = new Intent(FindDonor.this, DonorSearchList.class);
startActivity(intent);
finish();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}){
#Override
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String,String> parameters = new HashMap<String, String>();
parameters.put("bloodgroup", String.valueOf(mBlood));
parameters.put("area", String.valueOf(mArea));
return parameters;
}
};
requestQueue.add(request);
}
});
}
private void setupSpinnerBlood() {
ArrayAdapter bloodGroupSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.blood_group, android.R.layout.simple_spinner_item);
bloodGroupSpinnerAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
bloodgroup.setAdapter(bloodGroupSpinnerAdapter);
bloodgroup.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selection = (String) parent.getItemAtPosition(position);
if (!TextUtils.isEmpty(selection)) {
if (selection.equals(getString(R.string.blood_apos))) {
mBlood = BloodEntry.BLOOD_GROUP_A_POS;
} else if (selection.equals((getString(R.string.blood_bpos)))) {
mBlood = BloodEntry.BLOOD_GROUP_B_POS;
} else if (selection.equals(getString(R.string.blood_opos))) {
mBlood = BloodEntry.BLOOD_GROUP_O_POS;
} else if (selection.equals((getString(R.string.blood_oneg)))) {
mBlood = BloodEntry.BLOOD_GROUP_O_NEG;
}
}
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
mBlood = BloodEntry.BLOOD_GROUP_A_POS;
}
});
}
private void setupSpinnerArea() {
ArrayAdapter areaSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.area, android.R.layout.simple_spinner_item);
areaSpinnerAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
area.setAdapter(areaSpinnerAdapter);
area.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selection = (String) parent.getItemAtPosition(position);
if (!TextUtils.isEmpty(selection)) {
if (selection.equals(getString(R.string.donor_area_malir))) {
mArea = BloodEntry.DONOR_AREA_MALIR;
} else if (selection.equals(getString(R.string.donor_area_defence))) {
mArea = BloodEntry.DONOR_AREA_DEFENCE;
} else if (selection.equals(getString(R.string.donor_area_korangi))) {
mArea = BloodEntry.DONOR_AREA_KORANGI;
} else if (selection.equals(getString(R.string.donor_area_johar))) {
mArea = BloodEntry.DONOR_AREA_JOHAR;
}
}
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
mArea = BloodEntry.DONOR_AREA_MALIR;
}
});
}
}
and This is the code in which data will be shown:
package com.example.kamran.ebloodbank;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class DonorSearchList extends AppCompatActivity {
private String mArea;
private List<DataSet> donorList = new ArrayList<DataSet>();
private ListView listView;
private DonorAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_donor_search_list);
listView = (ListView) findViewById(R.id.donorListView);
adapter = new DonorAdapter(this, donorList);
listView.setAdapter(adapter);
}
}

You need to transfer data from the search to list activity.
Try something like this:
public class bridge {
public static List<DataSet> donorList = new ArrayList<DataSet>();
}
Then, in the class FindDonor:
donorSet.setName(donorData.getString("name"));
donorSet.setArea(donorData.getInt("area"));
donorList.add(donorSet);
//here put this line
bridge.donarList = donarList;
//rest code
Intent intent = new Intent(FindDonor.this, DonorSearchList.class);
Then, in the DonorSearchList class:
adapter = new DonorAdapter(this, bridge.donorList);

Populate recycle adapter from controller class

I'm trying to populate a recycle adapter from a controller class, to split the logic in the app. But I can't seem to get it working.. Do to the request is running on another thread, the view is not updated before it is shown. What am I doing wrong ?
FragmentClass:
package lassebjoerklund.homecontrol.views.fragments;
import android.app.Fragment;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import org.json.JSONArray;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import lassebjoerklund.homecontrol.R;
import lassebjoerklund.homecontrol.adapters.FridgeFragmentOverViewAdapter;
import lassebjoerklund.homecontrol.controllers.FridgeController;
import lassebjoerklund.homecontrol.decorations.DividerItemDecoration;
import lassebjoerklund.homecontrol.model.Product;
import lassebjoerklund.homecontrol.utils.FragmentUtil;
/**
* Created by zigge on 29-Mar-16.
*/
public class FridgeFragmentOverView extends Fragment {
private final FridgeController fridgeController = new FridgeController();
private RecyclerView recyclerView;
private LinkedList<String> types;
private FridgeFragmentOverViewAdapter adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_overview_layout, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.productOverviewRecycleView);
recyclerView.setHasFixedSize(true);
RecyclerView.ItemDecoration itemDecoration = new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST);
recyclerView.addItemDecoration(itemDecoration);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(layoutManager);
adapter = new FridgeFragmentOverViewAdapter(fridgeController.getProductsTypes());
recyclerView.setAdapter(adapter);
return v;
}
#Override
public void onResume() {
super.onResume();
fridgeController.refresh(getContext(), adapter);
}
}
Controller Class:
package lassebjoerklund.homecontrol.controllers;
import android.content.Context;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
import lassebjoerklund.homecontrol.adapters.FridgeFragmentOverViewAdapter;
import lassebjoerklund.homecontrol.interfaces.OnSucsess;
import lassebjoerklund.homecontrol.model.Product;
/**
* Created by zigge on 29-Mar-16.
*/
public class FridgeController implements OnSucsess {
private RequestQueue rQueue;
private ArrayList<Product> products;
private List<String> productsTypes;
public ArrayList<Product> getProducts() {
return products;
}
public List<String> getProductsTypes() {
return productsTypes;
}
public void refresh(Context context, final FridgeFragmentOverViewAdapter adapter) {
String fetchProducts = "http://87.52.28.25:900/index.php";
rQueue = Volley.newRequestQueue(context);
final JsonArrayRequest getProductsRequest = new JsonArrayRequest(fetchProducts, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
products = new ArrayList<>();
productsTypes = new ArrayList<>();
try {
for (int i = 0; i < response.length(); i++) {
JSONObject jsonObject = (JSONObject) response.get(i);
String barcode = jsonObject.getString("code");
String name = jsonObject.getString("name");
String ex_date = jsonObject.getString("ex_date");
String add_date = jsonObject.getString("add_date");
String type = jsonObject.getString("type");
Product product = new Product(barcode, name, ex_date, add_date, type);
products.add(product);
}
} catch (JSONException e) {
e.printStackTrace();
}
if (products.size() != 0) {
for (int i = 0; i < products.size(); i++) {
if (!productsTypes.contains(products.get(i).getType())) {
productsTypes.add(products.get(i).getType());
}
}
}
getProductsOnsucsess(adapter);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
rQueue.add(getProductsRequest);
}
#Override
public void getProductsOnsucsess(FridgeFragmentOverViewAdapter adapter) {
adapter.refreshAdapter(productsTypes);
}
}
Adapter:
package lassebjoerklund.homecontrol.adapters;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import lassebjoerklund.homecontrol.R;
import lassebjoerklund.homecontrol.model.Product;
/**
* Created by zigge on 29-Mar-16.
*/
public class FridgeFragmentOverViewAdapter extends RecyclerView.Adapter {
private List<String> types;
public FridgeFragmentOverViewAdapter(List<String> types) {
this.types = types;
}
#Override
public int getItemCount() {
return 0;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_overview_card_layout, null);
return new ProductsGroupedHolder(v);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
}
public class ProductsGroupedHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView tvTypeOfProduct, tvCount, tvExpired;
public ProductsGroupedHolder(View itemView) {
super(itemView);
tvTypeOfProduct = (TextView) itemView.findViewById(R.id.tvTypeOfProduct);
tvCount = (TextView) itemView.findViewById(R.id.tvCount);
tvExpired = (TextView) itemView.findViewById(R.id.tvExpired);
}
#Override
public void onClick(View v) {
}
}
public void refreshAdapter(List<String> types) {
if(this.types != null) {
this.types.clear();
this.types = types;
notifyDataSetChanged();
}else {
this.types = types;
notifyDataSetChanged();
}
}
}

Try calling:
adapter.notifyDataSetChanged();
after updating it.
Edit 1:
Return actual size of adapter items in getItemCount() as #prathamkesarkar said.

Simple looks like you have set the getItemType() method return 0.
That method determines how much item your RecyclerView have.
#Override
public int getItemCount() {
return type.size();
}

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Getting wrong position on RecyclerView - java

Related

android tablayout+viewPager2+recyclerView question，onTabSelected will repeated execution?

Calculating Price * Quantity from Adapter to Total Price from Activity

how to get the post key with position in Firebase Android

Blank Screen Shows after search from database (Android)

Populate recycle adapter from controller class

Categories

Resources