Develop Reference

RecyclerView is not being populated with items from firebase just a blank Activity Page

I'm still relatively new to Android and firebase and trying to populate recyclerview from firebase database but for some reasons that I can't get, the view is not populated.The activity loads but all I see is a blank activity page.I'd like to populate these views using data from a Firebase Database just to get three data(name,email,phonenos) of Users.
public class TestUsersActivity extends AppCompatActivity {
public TextView mname,email,phone;
private RecyclerView recyclerView;
FirebaseAuth mAuth;
DatabaseReference mDatabase;
private FirebaseRecyclerAdapter adapter;
private LinearLayoutManager linearLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_users);
recyclerView = findViewById(R.id.listuser);
mDatabase = FirebaseDatabase.getInstance().getReference().child("Users");
linearLayoutManager = new LinearLayoutManager(getApplicationContext());
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(linearLayoutManager);
fetch();
}
private void fetch() {
FirebaseRecyclerOptions<Users> options = new FirebaseRecyclerOptions.Builder<Users>()
.setQuery(mDatabase,Users.class)
.build();
adapter = new FirebaseRecyclerAdapter<Users, ViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull ViewHolder myViewHolder, int i, #NonNull Users users) {
myViewHolder.setName(users.getFname() + " "+ users.getLname());
myViewHolder.setEmail(users.getEmail());
myViewHolder.setphone(users.getPhonenos());
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.user_list_row,parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onDataChanged() {
super.onDataChanged();
}
};
recyclerView.setAdapter(adapter);
adapter.startListening();
}
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(View itemView) {
super(itemView);
mname = itemView.findViewById(R.id.name);
email = itemView.findViewById(R.id.email);
phone = itemView.findViewById(R.id.phoneNos);
}
public void setName(String string) {
mname.setText(string);
}
public void setEmail(String string) {
email.setText(string);
}
public void setphone(String string){
phone.setText(string);
}
}
}
Below is my modelclass that i want to get just the name,email and phone nos from.
public class Users {
private String fname;
private String lname;
private String email;
private String phonenos;
private String jobTitle;
private String dateCreated;
private String lastlogin;
public Users(){
}
public Users(String fname, String lname, String email, String phonenos, String jobTitle, String dateCreated, String lastlogin) {
this.fname = fname;
this.lname = lname;
this.email = email;
this.phonenos = phonenos;
this.jobTitle = jobTitle;
this.dateCreated = dateCreated;
this.lastlogin = lastlogin;
}
public String getFname() {
return fname;
}
public void setFname(String fname) {
this.fname = fname;
}
public String getLname() {
return lname;
}
public void setLname(String lname) {
this.lname = lname;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhonenos() {
return phonenos;
}
public void setPhonenos(String phonenos) {
this.phonenos = phonenos;
}
public String getJobTitle() {
return jobTitle;
}
public void setJobTitle(String jobTitle) {
this.jobTitle = jobTitle;
}
public String getDateCreated() {
return dateCreated;
}
public void setDateCreated(String dateCreated) {
this.dateCreated = dateCreated;
}
public String getLastlogin() {
return lastlogin;
}
public void setLastlogin(String lastlogin) {
this.lastlogin = lastlogin;
}
}

I don't know if you must pass a query instead of a database reference
make the query a member variable
......
private Query query;
......
do this:
query = FirebaseDatabase.getInstance().getReference().child("Users");
and pass it like this to options
FirebaseRecyclerOptions<Users> options = new FirebaseRecyclerOptions.Builder<Users>()
.setQuery(query,Users.class)
.build();
ALSO MAKE SURE YOUR FIREBASE SECURITY RULES ARE NOT SET TO READ FALSE

Recyclerview not showing data from Firebase

I keep getting a blank screen on my app but no errors and my Firebase contains data. It looks like its not retrieved correctly. I have checked out answers from other similar questions, tried the solutions but i still cannot find the solution to my problem. Kindly help am a bit new to this.
This is my OrderStatus class
public class OrderStatus extends AppCompatActivity {
public RecyclerView recyclerView;
public RecyclerView.LayoutManager layoutManager;
FirebaseDatabase database;
DatabaseReference requests;
FirebaseRecyclerAdapter<DeliveryRequest, OrderViewHolder> adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order_status);
database = FirebaseDatabase.getInstance();
requests = database.getReference("OrderRequests");
recyclerView = (RecyclerView)findViewById(R.id.listOrders);
//ADAPTER
loadOrders();
}
private void loadOrders() {
FirebaseRecyclerOptions<DeliveryRequest> options =
new FirebaseRecyclerOptions.Builder<DeliveryRequest>()
.setQuery(requests, new SnapshotParser<DeliveryRequest>() {
#NonNull
#Override
public DeliveryRequest parseSnapshot(#NonNull DataSnapshot snapshot) {
return null;
}
})
.build();
adapter = new FirebaseRecyclerAdapter<DeliveryRequest, OrderViewHolder>(options) {
#Override
public OrderViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// Create a new instance of the ViewHolder, in this case we are using a custom
// layout called R.layout.message for each item
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.order_layout, parent, false);
return new OrderViewHolder(view);
}
#Override
protected void onBindViewHolder(OrderViewHolder holder, int position, DeliveryRequest model) {
// Bind the Chat object to the ChatHolder
// ...
holder.txtOrderPhone.setText(model.getPhone());
holder.txtOrderAddress.setText(model.getAddress());
holder.txtOrderStatus.setText(convertCodeToStatus(model.getStatus()));
holder.txtOrderId.setText(adapter.getRef(position).getKey());
}
};
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
adapter.startListening();
}
private String convertCodeToStatus(String status){
if (status.equals("0"))
return "placed";
else if (status.equals("1"))
return "on my way";
else
return "Shipped";
}
}
My String class
public class DeliveryRequest {
public String firstName, lastName,address, phone,total, status;
public List<ProposalDetails> proposalDetails;
public DeliveryRequest() {
}
public DeliveryRequest(String firstName,String lastName, String address,String phone,String total,String status, List<ProposalDetails> proposalDetails){
this.firstName = firstName;
this.lastName = lastName;
this.address = address;
this.phone = phone;
this.proposalDetails = proposalDetails;
this.status = "0";
this.total= total;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public List<ProposalDetails> getProposalDetails() {
return proposalDetails;
}
public void setProposalDetails(List<ProposalDetails> proposalDetails) {
this.proposalDetails = proposalDetails;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getTotal() {
return total;
}
public void setTotal(String total) {
this.total = total;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}

You're implemented parseSnapshot by return null, which means that any DataSnapshot that comes from your database is turned into null.
You're probably looking for something like:
public DeliveryRequest parseSnapshot(#NonNull DataSnapshot snapshot) {
return snapshot.getValue(DeliveryRequest.class);
}

How do I get only the values insided an array on a texview

I've been trying to show my array of foods on a textview from my Firestore Database. I have been able to view the array on the textview but it is not readable by lame readers, they show in the array braces and the curly brackets. I want to extract the values like produName, Quantity, etc independently
Below is my Model class and Activity class.
public class Request {
private String phone;
private String name;
private String address;
private String total;
private String status;
private List<HashMap<String, String>> foods; //list of food orders
private #ServerTimestamp Date timestamp;
public Request() {
}
public Request(String phone, String name, String address, String total, List<HashMap<String, String>> foods) {
this.phone = phone;
this.name = name;
this.address = address;
this.total = total;
this.foods = foods;
this.status = "0"; //Default is 0, 0: Place, 1: Shipping, 2: Shipped
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getTotal() {
return total;
}
public void setTotal(String total) {
this.total = total;
}
public List<HashMap<String, String>> getFoods() {
return foods;
}
public void setFoods(List<HashMap<String, String>> foods) {
this.foods = foods;
}
public Date getTimestamp() {
return timestamp;
}
public void setTimestamp(Date timestamp) {
this.timestamp = timestamp;
}
MY ACTIVITY CLASS, I implemented call to firestore at onStart()
#Override
protected void onStart() {
super.onStart();
FirestoreRecyclerOptions<Request> options = new FirestoreRecyclerOptions.Builder<Request>()
.setQuery(query, Request.class)
.build();
adapter = new FirestoreRecyclerAdapter<Request, MainActivity.DataViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull MainActivity.DataViewHolder dataViewHolder, int i, #NonNull final Request mainMenuItem) {
dataViewHolder.setData(mainMenuItem.getTotal(), mainMenuItem.getName(), mainMenuItem.getStatus(), mainMenuItem.getPhone(),
mainMenuItem.getAddress(), mainMenuItem.getTimestamp(), mainMenuItem.getFoods());}
#NonNull
#Override
public MainActivity.DataViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.order_layout, parent, false);
return new MainActivity.DataViewHolder(view);
}
};
recyclerView.setAdapter(adapter);
adapter.startListening();
}
public class DataViewHolder extends RecyclerView.ViewHolder {
private View view;
DataViewHolder(View itemView) {
super(itemView);
view = itemView;
}
void setData(String orderTotalValue, String nameOfPerson, String dataOrderStatus, String dataOrderPhone, String dataOrderAddress,
Date dataDateAndTime, final List<HashMap<String,String>>foodsOrdered) {
TextView orderTotal = view.findViewById(R.id.order_total);
TextView orderStatus = view.findViewById(R.id.order_status);
TextView orderPhone = view.findViewById(R.id.order_phone);
TextView orderAddress = view.findViewById(R.id.order_address);
TextView orderName = view.findViewById(R.id.order_name);
TextView orderDateAndTime = view.findViewById(R.id.order_dateTime);
TextView orderFoods = view.findViewById(R.id.order_foods);
orderTotal.setText(orderTotalValue);
orderStatus.setText(convertCodeToStatus(dataOrderStatus));
orderPhone.setText(dataOrderPhone);
orderAddress.setText(dataOrderAddress);
orderName.setText(nameOfPerson);
orderDateAndTime.setText(dataDateAndTime.toString());
//what i must do to foods array when it comes and then finally is attached to the textview!
orderFoods.setText(foodsOrdered.toString());
}
}

You can create a model class (OrderData) with this parameters discount, price, productId, productName, quantity and replace in ActualFoodRequest class
private List<String> foods; //list of food orders
with this
private List<OrderData> foods;

unable to retrieve data from one app to another app from firebase single Database

I have 2 applications(different package names) which use one Firebase database. One app has to write access to the database and another have read access to the database.in my second application, i use recyclerview to retrieve data which is stored by 1st App.
for this I use below code:
FirebaseOptions options = new FirebaseOptions.Builder()
.setApplicationId("1:567....259c8f58311") // Required for Analytics.
.setApiKey("AIzaSyA9BRxl......hE03y5qD-c") // Required for Auth.
.setDatabaseUrl("https://mycity-3a561.firebaseio.com/") // Required for RTDB.
.build();
FirebaseApp.initializeApp(this /* Context */, options, "MyCity");
// Retrieve my other app.
FirebaseApp app = FirebaseApp.getInstance("MyCity");
// Get the database for the other app.
FirebaseDatabase secondaryDatabase = FirebaseDatabase.getInstance(app);
DatabaseReference data = secondaryDatabase.getInstance().getReference();
data.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot ds : snapshot.getChildren()) {
for (DataSnapshot dSnapshot : ds.getChildren()) {
WaterClass waterClass = dSnapshot.getValue(WaterClass.class);
Log.d("Show", waterClass.getName() == null ? "" : waterClass.getName());
list.add(waterClass);
}
adapter = new WaterAdapter(ShowWaterDetails.this, list);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
progressDialog.dismiss();
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
progressDialog.dismiss();
}
});
}
Adapter class
private class WaterAdapter extends RecyclerView.Adapter<WaterAdapter.ViewHolder> {
ShowWaterDetails showDetail;
List<WaterClass> listData;
public WaterAdapter(ShowWaterDetails showWaterDetails, List<WaterClass> list) {
this.showDetail = showWaterDetails;
this.listData = list;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.show_items, parent, false);
WaterAdapter.ViewHolder viewHolder = new WaterAdapter.ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(WaterAdapter.ViewHolder holder, int position) {
WaterClass AllDetails = listData.get(position);
holder.NameTextView.setText(AllDetails.getName());
holder.DetailTextView.setText(AllDetails.getDetail());
holder.DateTextView.setText(AllDetails.getDate());
holder.LocationTextView.setText(AllDetails.getLocation());
holder.TypeTextView.setText(AllDetails.getType());
Picasso.with(showDetail).load(AllDetails.getImgurl()).resize(120, 60).into(holder.ImageTextView);
}
#Override
public int getItemCount() {
return listData.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
public TextView NameTextView;
public TextView DetailTextView;
public TextView DateTextView;
public TextView LocationTextView;
public TextView TypeTextView;
public ImageView ImageTextView;
public ViewHolder(View itemView) {
super(itemView);
NameTextView = itemView.findViewById(R.id.ShowNameTextView);
DetailTextView = itemView.findViewById(R.id.ShowDetailTextView);
DateTextView = itemView.findViewById(R.id.ShowDateTextView);
LocationTextView = itemView.findViewById(R.id.ShowLocationTextView);
TypeTextView = itemView.findViewById(R.id.ShowTypeTextView);
ImageTextView = itemView.findViewById(R.id.ShowImageView);
}
}
}
}
POJO Class
class WaterClass {
private String id;
private String email;
private String name;
private String type;
private String detail;
private String location;
private String date;
private String imgurl;
public WaterClass(){
}
public WaterClass(String id, String currentUserString, String imageUrl, String nameString, String typeString, String detailString, String locationString, String dateString) {
this.id = id;
this.email = currentUserString;
this.name =nameString;
this.type = typeString;
this.detail = detailString;
this.location = locationString;
this.date = dateString;
this.imgurl = imageUrl;
}
public String getImgurl() {
return imgurl;
}
public void setImgurl(String imgurl) {
this.imgurl = imgurl;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
}
:
there is no error but my recycler not showing anything

go to onStart() and start listening
#Override
protected void onStart() {
super.onStart();
adapter.startListening();
}
and in your onStop
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
The FirebaseRecyclerAdapter uses a snapshot listener to monitor changes to the Firestore query. To begin listening for data, call the startListening() method. You may want to call this in your onStart() method. Make sure you have finished any authentication necessary to read the data before calling startListening() or your query will fail.
Be sure that the names of constant in the POJO match exatly the names
of your database structure in your firebase console !!
ps: do not post your api-keys or app-ids in your questions, keep them secret, and consider using firebaserecycleradapter if you are using firebase-database , it will be more easy to setup and to show values.
Your POJO is ok !

Found Solution!!
just change this part of a code
FirebaseApp.initializeApp(this /* Context */, options, "MyCity");
// Retrieve my other app.
FirebaseApp app = FirebaseApp.getInstance("MyCity");
TO
FirebaseApp.initializeApp(this);
// Retrieve my other app.
FirebaseApp app = FirebaseApp.getInstance("[DEFAULT]");

Nested object in Json

This is my JSON:
I need to access to extra_services and get the service_name.
I know I can do it directly using Gson but the problem is that I need to use getters and setters because I'm using an adapter inside of a recycler, how can I do that?
here is my adapter class where I need to get the service name
public class ExtraServicesAdapter extends RecyclerView.Adapter<ExtraServicesAdapter.ViewHolder> implements View.OnClickListener
{
private ArrayList<Business> businessList;
private Activity activity;
private int layoutMolde,idb;
public ExtraServicesAdapter(Activity activity, ArrayList<Business> list, int layout)
{
this.activity = activity;
this.businessList = list;
layoutMolde = layout;
}
#Override
public ExtraServicesAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_services_basic, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position)
{
if(businessList.get(position).getExtra_services()==null)
{
holder.txtNameServiceBasic.setText("There's nothing to show");
}
holder.txtNameServiceBasic.setText(businessList.get(position).getExtra_services());
}
#Override
public int getItemCount()
{
return businessList.size();
}
#Override
public void onClick(View v)
{
}
public class ViewHolder extends RecyclerView.ViewHolder
{
public TextView txtNameServiceBasic;
public ViewHolder( View itemView)
{
super(itemView);
txtNameServiceBasic = (TextView) itemView.findViewById(R.id.txtNameServiceBasic);
}
}
}
and this is my class where are the getters and setters that I'm using
public class Business {
private Integer id,rating;
private String name, description, cover_url_string, logo_url_string, icon_default,business_name,cover_default,extra_services;
private Boolean status;
public Business(){}
public Business(Integer id,Integer rating,String business_name, String name, String description, String logo_url_string, String cover_default, String icon_default,String cover_url_string,String extra_services) {
this.id = id;
this.name = name;
this.business_name=business_name;
this.description = description;
this.logo_url_string = logo_url_string;
this.cover_url_string = cover_url_string;
this.rating=rating;
this.icon_default=icon_default;
this.cover_default=cover_default;
this.extra_services=extra_services;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getRating() {
return rating;
}
public String getBusiness_name() {
return business_name;
}
public void setBusiness_name(String business_name) {
this.business_name = business_name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLogo_url_string() {
return logo_url_string;
}
public void setLogo_url_string(String logo_url_string) {
this.logo_url_string = logo_url_string;
}
public String getIcon_default() {
return icon_default;
}
public String getCover_default() {
return cover_default;
}
public String getCover_url_string() {
return cover_url_string;
}
public String getExtra_services() {
return extra_services;
}
public void setExtra_services() {
this.extra_services=extra_services;
}
}

You can add an ExtraServices class that contains a list of ExtraService
ExtraService
public class ExtraService {
private String Id;
private String ServiceName;
public String getId() {
return Id;
}
public void setId(String Id) {
this.Id = Id;
}
public String getServiceName() {
return ServiceName;
}
public void setServiceName(String ServiceName) {
this.ServiceName = ServiceName;
}
ExtraServices
public class ExtraServices {
private List<ExtraService> extraServicesList;
public List<ExtraService> getExtraServicesList() {
return extraServicesList;
}
public void setExtraServicesList(List<ExtraService> extraServicesList) {
this.extraServicesList = extraServicesList;
}
public void add(ExtraService extraService){
if(extraServicesList == null){
extraServicesList = new ArrayList<>();
}
extraServicesList.add(extraService);
}
And in your Business class add getters and setters of ExtraServices
private ExtraServices extraServices;
public ExtraServices getExtraServices () {
return extraServices;
}
public void setExtraServices (ExtraServices extraServices) {
this.extraServices = extraServices;
}
After you have to do the setter process and in your Adapter you should do something like this:
holder.txtNameServiceBasic.setText(businessList.get(position).getExtraServices().getExtraServicesList().get(posistion).getServiceName());