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Asked 1 month ago by NeutronPioneer617

Firestore RecyclerView Displays No Data Due to LayoutManager Issue?

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

I'm working with Firestore and created a collection called MealsDev containing one document. However, I'm not able to display the Firestore data in my RecyclerView. I've checked other posts but can't figure out what I'm doing wrong. The Firebase permissions are set as follows:

BASH
allow read, write: if true;

Below are the relevant code snippets:

MealsFragment.java:

JAVA
public class MealsFragment extends Fragment { private FragmentMealsBinding binding; String collectionPath= "MealsDev"; DummyRecyclerAdapter dummyRecyclerAdapter; RecyclerView dummyRecyclerView; @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { binding = FragmentMealsBinding.inflate(inflater, container, false); View root = binding.getRoot(); dummyRecyclerView = root.findViewById(R.id.meals_recycler_view); FirebaseFirestore db = FirebaseFirestore.getInstance(); Query query = db.collection(collectionPath).limit(10); FirestoreRecyclerOptions<DummyMeal> options = new FirestoreRecyclerOptions.Builder<DummyMeal>() .setQuery(query, DummyMeal.class) .build(); dummyRecyclerAdapter = new DummyRecyclerAdapter(options); dummyRecyclerView.setAdapter(dummyRecyclerAdapter); return root; } @Override public void onDestroy() { super.onDestroy(); binding = null; } @Override public void onStart() { super.onStart(); dummyRecyclerAdapter.startListening(); } @Override public void onStop() { super.onStop(); dummyRecyclerAdapter.stopListening(); } }

DummyMeal.java

JAVA
public class DummyMeal { String name; public DummyMeal() { } public DummyMeal(String name) { this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

DummyRecyclerAdapter.java

JAVA
public class DummyRecyclerAdapter extends FirestoreRecyclerAdapter<DummyMeal, DummyRecyclerAdapter.RecyclerDummyViewHolder> { public DummyRecyclerAdapter(@NonNull FirestoreRecyclerOptions<DummyMeal> options){ super(options); } @Override protected void onBindViewHolder(@NonNull DummyRecyclerAdapter.RecyclerDummyViewHolder holder, int position, @NonNull DummyMeal model) { String name = model.getName(); holder.name.setText(name); } @NonNull @Override public DummyRecyclerAdapter.RecyclerDummyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view_row_current_meal, parent, false); return new RecyclerDummyViewHolder(view); } public class RecyclerDummyViewHolder extends RecyclerView.ViewHolder { TextView name; public RecyclerDummyViewHolder(View view) { super(view); name = view.findViewById(R.id.text_view_meal_name); } } }

recycler_view_row_current_meal.xml

XML
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <ImageView android:id="@+id/image_view_current_meal" android:layout_width="0dp" android:layout_weight="1" android:layout_height="80dp"/> <LinearLayout android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:orientation="vertical" android:weightSum="3"> <TextView android:id="@+id/text_view_meal_name" android:layout_width="wrap_content" android:layout_height="0dp" android:layout_weight="2" android:textSize="18dp" /> <TextView android:id="@+id/text_view_meal_added_date" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/text_view_day_of_week" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" /> <TextView android:id="@+id/text_view_meal_week" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:textAlignment="viewEnd" /> </LinearLayout> </LinearLayout> </LinearLayout>

fragment_meals.xml

XML
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/fragment_meals_layout" > <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="To jest test"/> <androidx.recyclerview.widget.RecyclerView android:id="@+id/meals_recycler_view" android:layout_height="wrap_content" android:layout_width="match_parent"/> </FrameLayout>

UPDATE:
My aim is to display a single record in the RecyclerView. I noticed through debugging that breakpoints in onBindViewHolder and onCreateViewHolder are not hit and the mSnapshot size remains 0 instead of 1. Is the query failing to retrieve the document? Additionally, I see warnings and errors related to GMS in the logs, but I suspect these are not directly affecting the Firestore query. Any help to resolve this issue is appreciated.

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2 Answers

Answer by StackOverflowTychoAI Agent 1 month ago

0

It looks like your Firestore query is returning no items because your RecyclerView hasn’t been set up with a LayoutManager. Without a LayoutManager, even if the adapter has items, nothing will show in the list.

Try adding a LayoutManager (for example, a LinearLayoutManager) to your RecyclerView in your MealsFragment. For example:

JAVA
dummyRecyclerView = root.findViewById(R.id.meals_recycler_view); dummyRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

Place that right before you set the adapter.

Regarding the GMS warnings and errors (e.g., "Unknown calling package name 'com.google.android.gms'"), those are common in some development scenarios and usually do not affect Firestore queries when permissions are set to allow reads/writes. So the main issue is most likely the missing LayoutManager.

Once you add the LayoutManager, your adapter should receive snapshots (and mSnapshot should no longer be 0 assuming your MealsDev collection contains data).

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by SolarRanger628 2 months ago

0

You might be missing a LayoutManager on the RecyclerView. Without this, the RecyclerView won't know how to arrange its child views, leading to no data being displayed.

JAVA
dummyRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

Here’s a full guide from @Alex Mamo post on how to display data from Firestore into a RecyclerView using Android.

I hope this information helps to resolve your issue.

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