Develop Reference

FirebaseRecyclerOptions with spinner onItemSelected query issue

I have a spinner with locations and I would like to click on the location from the spinner and filter my Firebase data to show all items with that location selected.
I have tried putting the "onItemSelected" code fragment in the onStart area before and after the FirebaseRecyclerOptions and when I open the app and select the location from the spinner nothing new populates. It still shows all the data and all the locations.
public class MainActivity extends AppCompatActivity {
RecyclerView mRecyclerView;
Spinner mLocationSpinner;
DatabaseReference mRef;
FirebaseDatabase mFirebaseDatabase;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.recyclerview);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));
mFirebaseDatabase = FirebaseDatabase.getInstance();
mRef = (DatabaseReference) mFirebaseDatabase.getReference("Data");
}
#Override
protected void onStart() {
super.onStart();
FirebaseRecyclerOptions<Model> options =
new FirebaseRecyclerOptions.Builder<Model>()
.setQuery(mRef, Model.class)
.build();
FirebaseRecyclerAdapter firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Model, ViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull ViewHolder holder , int position , #NonNull Model model) {
holder.setDetails(getApplicationContext(), model.getBusiness(), model.getImage());
mLocationSpinner = (SearchableSpinner) findViewById(R.id.locationSpinner);
ArrayAdapter<CharSequence> spinAdapter = ArrayAdapter.createFromResource(MainActivity.this,
R.array.location_arrays, android.R.layout.simple_spinner_item);
spinAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mLocationSpinner.setAdapter(spinAdapter);
mLocationSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent , View view , int position , long id) {
String locationSpinner = parent.getItemAtPosition(position).toString();
Query querySpinner = mRef.orderByChild("location").equalTo(String.valueOf(mLocationSpinner));
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent , int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row, parent, false);
return new ViewHolder(view);
}
};
firebaseRecyclerAdapter.startListening();
mRecyclerView.setAdapter(firebaseRecyclerAdapter);
}

My recyclerview doesn't show up when I change my activity

When my app start up the recyclerview loads up. But when I change my activity, like, when i go to ProfileActivity from DashboardActivity and Come back to DashboardActivity the recyclerview vanishes. I don't get the problem.
This part is in onCreate method
recyclerView = findViewById(R.id.recycler_view);
recyclerView.setAdapter(adapter);
adapter.startListening();
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(layoutManager);
This is the onStart method
#Override
protected void onStart() {
super.onStart();
Query query = firebaseFirestore.collection("requests")
.orderBy("creationTime", Query.Direction.DESCENDING);
FirestoreRecyclerOptions<Request> options = new FirestoreRecyclerOptions.Builder<Request>()
.setQuery(query, Request.class)
.build();
FirestoreRecyclerAdapter<Request, RequestViewHolder> adapter =
new FirestoreRecyclerAdapter<Request, RequestViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull RequestViewHolder holder, int i, #NonNull Request request) {
holder.requestUserNameTV.setText(request.getUser().getFullName());
holder.requestCreationTimeTV.setText(request.getCreationTime());
holder.requestedBloodGroupTV.setText(request.getBloodGroup());
holder.requestLocationTV.setText(request.getLocation());
holder.requestMessageTV.setText(request.getMessage());
}
#NonNull
#Override
public RequestViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
return new RequestViewHolder(v);
}
};
recyclerView.setAdapter(adapter);
adapter.startListening();
}
This is the ViewHolder
public class RequestViewHolder extends RecyclerView.ViewHolder {
public TextView requestUserNameTV, requestCreationTimeTV, requestedBloodGroupTV;
public TextView requestLocationTV, requestMessageTV;
public LinearLayout ll;
public RequestViewHolder(#NonNull View itemView) {
super(itemView);
ll = itemView.findViewById(R.id.ll);
requestUserNameTV = itemView.findViewById(R.id.requestUserNameTV);
requestCreationTimeTV = itemView.findViewById(R.id.requestCreationTimeTV);
requestedBloodGroupTV = itemView.findViewById(R.id.requestedBloodGroupTV);
requestLocationTV = itemView.findViewById(R.id.requestedLocationTV);
requestMessageTV = itemView.findViewById(R.id.requestMessageTV);
}
}

Move your code from OnStart to OnCreate. it should solve your problem

Now I'm doing it this way. and it works.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
setUpRecyclerView();
}
private void setUpRecyclerView() {
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
firebaseFirestore = FirebaseFirestore.getInstance();
Query query = firebaseFirestore.collection("requests")
.orderBy("creationTime", Query.Direction.DESCENDING);
FirestoreRecyclerOptions<Request> options = new FirestoreRecyclerOptions.Builder<Request>()
.setQuery(query, Request.class)
.build();
FirestoreRecyclerAdapter<Request, RequestViewHolder> adapter =
new FirestoreRecyclerAdapter<Request, RequestViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull RequestViewHolder holder, int i, #NonNull Request request) {
holder.requestUserNameTV.setText(request.getUser().getFullName());
holder.requestCreationTimeTV.setText(request.getCreationTime());
holder.requestedBloodGroupTV.setText(request.getBloodGroup());
holder.requestLocationTV.setText(request.getLocation());
holder.requestMessageTV.setText(request.getMessage());
}
#NonNull
#Override
public RequestViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
RequestViewHolder requestViewHolder = new RequestViewHolder(v);
return requestViewHolder;
}
};
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
adapter.startListening();
}

RecyclerView: No Adapter attached; Skipping layout in fragment

I found two similar questions but none of them worked. I am using fragment and RecyclerViews. The console displays the error
E/RecyclerView: No adapter attached; skipping layout
https://i.stack.imgur.com/dxk8y.png Adapter
https://i.stack.imgur.com/0J2io.png Fragment
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.listkos, null);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
User user = entries.get(position);
holder.textViewTitle.setText(entries.get(position).getnmkos());
holder.textViewShortDesc.setText(entries.get(position).getHp());
}
#Override
public int getItemCount() {
return entries.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView textViewTitle, textViewShortDesc;
ImageView imageView;
public MyViewHolder(View itemView) {
super(itemView);
textViewTitle = itemView.findViewById(R.id.tvnm);
textViewShortDesc = itemView.findViewById(R.id.tvhp);
}
}
}
this fragment
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_beranda, container, false);
database = FirebaseDatabase.getInstance().getReference("Users");
firebaseAuth = FirebaseAuth.getInstance();
firebaseUser = firebaseAuth.getCurrentUser();
re = (RecyclerView) view.findViewById(R.id.recyle_buka);
rvLayoutManager = new LinearLayoutManager(getActivity());
re.setLayoutManager(rvLayoutManager);
loadEntries();
return view;
}
private void loadEntries(){
database.child("Users").child(firebaseUser.getUid()).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
entries= new ArrayList<>();
for (DataSnapshot noteDataSnapshot:dataSnapshot.getChildren()){
User user=noteDataSnapshot.getValue(User.class);
user.setKey(noteDataSnapshot.getKey());
entries.add(user);
}
rvAdapter = new RvAdapter(entries) ;// This is still empty, probably
re.setAdapter(rvAdapter);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
Log.w("LogFragment", "loadLog:onCancelled", databaseError.toException());
}
});
}
}
still not working guys
/*It looks like your post is mostly code; please add some more detail */

You must be create a Linear Layout manager. You must be set adapter to the recyclerview.
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
re.setLayoutManager(linearLayoutManager);
YourAdapter yourAdapter = new YourAdapter(list);
re.setAdapter(yourAdapter);

E/RecyclerView: No adapter attached; skipping layout
It means you haven't attached the adapter to your RecyclerView. So, you need to initialized your RecyclerView with an empty adapter. Something like this:
re = (RecyclerView) view.findViewById(R.id.recyle_buka);
rvLayoutManager = new LinearLayoutManager(getActivity());
re.setLayoutManager(rvLayoutManager);
// initialize empty adapter
entries= new ArrayList<>();
rvAdapter = new RvAdapter(entries);
re.setAdapter(rvAdapter);
Then, whenever you need to reload and refresh the RecyclerView, you should not doing this:
private void loadEntries(){
...
entries= new ArrayList<>();
for (DataSnapshot noteDataSnapshot:dataSnapshot.getChildren()){
User user=noteDataSnapshot.getValue(User.class);
user.setKey(noteDataSnapshot.getKey());
entries.add(user);
}
// DON'T DO THIS!
rvAdapter = new RvAdapter(entries) ;
re.setAdapter(rvAdapter);
}
because it resetting your adapter with a new Adapter.
What you need is refreshing the list and notifying the adapter for data changes.
First, add the following method to your Adapter to reload the list:
public void swap(List<User> list) {
entries.clear();
entries.addAll(list);
notifyDataSetChanged();
}
Then add it to your loadEntries(). Something like this:
private void loadEntries() {
...
List<User> newEntries = new ArrayList<>();
for (DataSnapshot noteDataSnapshot:dataSnapshot.getChildren()){
User user=noteDataSnapshot.getValue(User.class);
user.setKey(noteDataSnapshot.getKey());
newEntries.add(user);
}
rvAdapter.swap(newEntries);
}

This happen because you didn't set layout manager to Recyclerview.
Refer below example.
Initialize recyclerview
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
Initialize your adapter class
mAdapter = new MoviesAdapter(movieList);
now set layout manager to recyleview
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);

recyclerviewadapter not working [duplicate]

I'm try to retrieve datafrom database in my fragment onViewCreated method I have used FirebaseRecylerAdapter like below
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
FirebaseRecyclerAdapter<AllUsers, AllUsersViewHolder> firebaseRecyclerAdapter;
}
public static class AllUsersViewHolder extends RecyclerView.ViewHolder {
View view;
public AllUsersViewHolder(View itemView) {
super(itemView);
view = itemView;
}
}
when I use firebaseRecyclerAdapter = new FirebaseRecyclerAdapter it wont give me the populateViewHolder method just give method like below
FirebaseRecyclerAdapter<AllUsers, AllUsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<AllUsers, AllUsersViewHolder>() {
#Override
protected void onBindViewHolder(AllUsersViewHolder holder, int position, AllUsers model) {
}
#Override
public AllUsersViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return null;
}
};
Can someone please tell me why this is happening

The constructor of the Firebase...Adapter classes has changed in FirebaseUI version 3. Given this query:
Query query = FirebaseDatabase.getInstance()
.getReference()
.child("users")
.equalTo(name);
If you're using a version 3 or higher, you use FirebaseRecyclerOptions:
FirebaseRecyclerOptions<model_class_name> options =
new FirebaseRecyclerOptions.Builder<model_class_name>()
.setQuery(query, model_class_name.class)
.build();
Then declare a FirebaseRecyclerAdapter:
FirebaseRecyclerAdapter adapter = new FirebaseRecyclerAdapter<Chat, ChatHolder>(options) {
add the variable options as above. It is the variable of the class FirebaseRecyclerOptions
Then to add items you have to use onBindViewHolder since its the latest version of firebase ui:
#Override
protected void onBindViewHolder(Holder holder, int position, model_class_name model) {
// Bind the class object to the holder
// ...
}
For more info check this: https://github.com/firebase/FirebaseUI-Android/tree/master/database

Firestore Recyclerview: No content is being loaded

I've tried the following code to try firestore recyclreview. But it looks like no content is being loaded. And yes, adapter.startListening() is being called onStart.
query = FirebaseFirestore.getInstance()
.collection("users")
.document(mAuth.getCurrentUser().getUid())
.collection("posts");
recyclerView = (RecyclerView) getActivity().findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
FirestoreRecyclerOptions<Post> options = new FirestoreRecyclerOptions.Builder<Post>()
.setQuery(query, Post.class)
.build();
adapter = new FirestoreRecyclerAdapter<Post, NewsfeedViewholder>(options) {
#Override
protected void onBindViewHolder(NewsfeedViewholder holder, int position, Post model) {
holder.setView(model.getContent());
}
#Override
public NewsfeedViewholder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_post, parent, false);
return new NewsfeedViewholder(view);
}
};
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));