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

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

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();
}

Related

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);
}

Attempting Horizontal Firebase RecyclerView with MultiViews

Im attempting a FireBase Horizontal RecyclerView (like an Netflix clone).
I have looked at Git and Android Arsenal to find programing similar, but had been unsuccessful finding anything with a firebase backend. I had played with the adapter and the database. I have work on this for a couple days without finding a solution.
public class RestaurantList extends AppCompatActivity {
RecyclerView recyclerView1;
RecyclerView recyclerView2;
FirebaseRecyclerOptions<Restaurant> options = new FirebaseRecyclerOptions.Builder<Restaurant>()
.setQuery(FirebaseDatabase.getInstance()
.getReference()
.child("Restaurants1")
,Restaurant.class)
.build();
FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder> adapter = new FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder>(options) {
#NonNull
#Override
public RestaurantViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.restaurant_item, parent, false);
return new RestaurantViewHolder(itemView);
}
#Override
protected void onBindViewHolder(#NonNull RestaurantViewHolder viewHolder, int position, #NonNull Restaurant model) {
viewHolder.txt_restaurant_name.setText(model.getName());
Picasso.get().load(model.getImage())
.into(viewHolder.img_restaurant);
final Restaurant clickItem = model;
viewHolder.setItemClickListener(new ItemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Intent foodList = new Intent(RestaurantList.this, Home.class);
Common.restaurantSelected=adapter.getRef(position).getKey();
startActivity(foodList);
}
});
}
};
FirebaseRecyclerOptions<Restaurant> options2 = new FirebaseRecyclerOptions.Builder<Restaurant>()
.setQuery(FirebaseDatabase.getInstance()
.getReference()
.child("Restaurants2")
,Restaurant.class)
.build();
FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder> adapter2= new FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder>(options2) {
#NonNull
#Override
public RestaurantViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.restaurant_item, parent, false);
return new RestaurantViewHolder(itemView);
}
#Override
protected void onBindViewHolder(#NonNull RestaurantViewHolder viewHolder, int position, #NonNull Restaurant model) {
viewHolder.txt_restaurant_name.setText(model.getName());
Picasso.get().load(model.getImage())
.into(viewHolder.img_restaurant);
final Restaurant clickItem = model;
viewHolder.setItemClickListener(new ItemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Intent foodList = new Intent(RestaurantList.this, Home.class);
Common.restaurantSelected=adapter2.getRef(position).getKey();
startActivity(foodList);
}
});
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_restaurant_list);
RelativeLayout relativeLayout = findViewById(R.id.root2_layout);
AnimationDrawable animationDrawable = (AnimationDrawable)relativeLayout.getBackground();
animationDrawable.setEnterFadeDuration(5);
animationDrawable.setExitFadeDuration(1000);
animationDrawable.start();
LinearLayoutManager layoutManager = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
LinearLayoutManager layoutManager2 = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
recyclerView1 = (RecyclerView) findViewById(R.id.recycler_restaurant);
recyclerView1.setLayoutManager(layoutManager);
recyclerView2 = (RecyclerView) findViewById(R.id.recycler_restaurant2);
recyclerView1.setLayoutManager(layoutManager2);
loadAsianFood();
loadSteakHouse();
}
private void loadSteakHouse() {
adapter.startListening();
recyclerView1.setAdapter(adapter);
recyclerView1.getAdapter().notifyDataSetChanged();
recyclerView1.scheduleLayoutAnimation();
}
private void loadAsianFood() {
adapter2.startListening(); // Did you mean adapter2.startListening()?
recyclerView2.setAdapter(adapter2);
recyclerView2.getAdapter().notifyDataSetChanged();
recyclerView2.scheduleLayoutAnimation();
}
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
adapter2.stopListening();;
}
#Override
protected void onResume() {
super.onResume();
if (adapter != null)
adapter.startListening();
adapter2.startListening();
}
}
It only runs the first category (Restaurant1) only.

A few problems I noticed, though I don't know if they'll solve your actual issue.
1 - You are calling startListening on the first adapter when it should be the second:
private void loadAsianFood() {
adapter.startListening(); // Did you mean adapter2.startListening()?
recyclerView2.setAdapter(adapter2);
recyclerView2.getAdapter().notifyDataSetChanged();
recyclerView2.scheduleLayoutAnimation();
}
2 - You are only stopping the first adapter, not the second.
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
3 - You are only resuming the first adapter, not the second:
#Override
protected void onResume() {
super.onResume();
if (adapter != null)
adapter.startListening();
}

RecyclerView recyclerView1;
RecyclerView recyclerView2;
FirebaseRecyclerOptions<Restaurant> options = new FirebaseRecyclerOptions.Builder<Restaurant>()
.setQuery(FirebaseDatabase.getInstance()
.getReference("RestaurantCategory")
.child("01").child("SteakHouse")
,Restaurant.class)
.build();
FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder> adapter = new FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder>(options) {
#NonNull
#Override
public RestaurantViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.restaurant_item, parent, false);
return new RestaurantViewHolder(itemView);
}
#Override
protected void onBindViewHolder(#NonNull RestaurantViewHolder viewHolder, int position, #NonNull Restaurant model) {
viewHolder.txt_restaurant_name.setText(model.getName());
Picasso.get().load(model.getImage())
.into(viewHolder.img_restaurant);
final Restaurant clickItem = model;
viewHolder.setItemClickListener(new ItemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Intent foodList = new Intent(RestaurantList.this, Home.class);
Common.restaurantSelected=adapter.getRef(position).getKey();
startActivity(foodList);
}
});
}
};
FirebaseRecyclerOptions<Restaurant> options2 = new FirebaseRecyclerOptions.Builder<Restaurant>()
.setQuery(FirebaseDatabase.getInstance()
.getReference("RestaurantCategory")
.child("02").child("AsianFood")
,Restaurant.class)
.build();
FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder> adapter2= new FirebaseRecyclerAdapter<Restaurant, RestaurantViewHolder>(options2) {
#NonNull
#Override
public RestaurantViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.restaurant_item, parent, false);
return new RestaurantViewHolder(itemView);
}
#Override
protected void onBindViewHolder(#NonNull RestaurantViewHolder viewHolder, int position, #NonNull Restaurant model) {
viewHolder.txt_restaurant_name.setText(model.getName());
Picasso.get().load(model.getImage())
.into(viewHolder.img_restaurant);
final Restaurant clickItem = model;
viewHolder.setItemClickListener(new ItemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Intent foodList = new Intent(RestaurantList.this, Home.class);
Common.restaurantSelected=adapter2.getRef(position).getKey();
startActivity(foodList);
}
});
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_restaurant_list);
RelativeLayout relativeLayout = findViewById(R.id.root2_layout);
AnimationDrawable animationDrawable = (AnimationDrawable)relativeLayout.getBackground();
animationDrawable.setEnterFadeDuration(5);
animationDrawable.setExitFadeDuration(1000);
animationDrawable.start();
LinearLayoutManager layoutManager = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
LinearLayoutManager layoutManager2 = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
recyclerView1 = (RecyclerView) findViewById(R.id.recycler_restaurant);
recyclerView1.setLayoutManager(layoutManager);
recyclerView2 = (RecyclerView) findViewById(R.id.recycler_restaurant2);
recyclerView1.setLayoutManager(layoutManager2);
loadAsianFood();
loadSteakHouse();
}
private void loadSteakHouse() {
adapter.startListening();
recyclerView1.setAdapter(adapter);
recyclerView1.getAdapter().notifyDataSetChanged();
recyclerView1.scheduleLayoutAnimation();
}
private void loadAsianFood() {
adapter2.startListening(); // Did you mean adapter2.startListening()?
recyclerView2.setAdapter(adapter2);
recyclerView2.getAdapter().notifyDataSetChanged();
recyclerView2.scheduleLayoutAnimation();
}
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
adapter2.stopListening();;
}
#Override
protected void onResume() {
super.onResume();
if (adapter != null)
adapter.startListening();
adapter2.startListening();
}
}

setAdapter in RecyclerView cannot be applied to FirebaseRecyclerAdapter

i am trying to fetch data from firebase Realtime database and showing the data in recycler view but it shows an error
recyclerView = findViewById(R.id.RecyclerView);
recyclerView.setHasFixedSize(true);
databaseReference = firebaseDatabase.getInstance().getReference().child("Collection");
options = new FirebaseRecyclerOptions.Builder<CategoryItem>().setQuery(databaseReference,CategoryItem.class).build();
adapter = new FirebaseRecyclerAdapter<CategoryItem, CtegoryViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull CtegoryViewHolder holder, int position, #NonNull CategoryItem model) {
Picasso.get().load(model.getImageLink()).into(holder.i1, new Callback() {
#Override
public void onSuccess() {
}
#Override
public void onError(Exception e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
holder.t1.setText(model.getName());
}
#NonNull
#Override
public CtegoryViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_view_layout,viewGroup,false);
return new CtegoryViewHolder(view);
}
};
androidx.recyclerview.widget.GridLayoutManager gridLayoutManager = new GridLayoutManager(this,1);
recyclerView.setLayoutManager(gridLayoutManager);
adapter.startListening();
recyclerView.setAdapter(adapter);

Retrieve data from onbindviewholder using FirebaseRecyclerAdapter android

I'm working with firebase in android. The problem I facing is data stored on my database but I can't show them. Here is my code :
final FirebaseRecyclerOptions<Blog> options =
new FirebaseRecyclerOptions.Builder<Blog>()
.setQuery(databaseReference, Blog.class)
.build();
final FirebaseRecyclerAdapter<Blog, BlogViewHolder>
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(options) {
#Override
public BlogViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.blog_row, parent, false);
return new BlogViewHolder(view);
}
#Override
protected void onBindViewHolder(BlogViewHolder holder, int position, Blog model) {
holder.setDesc(model.getDescription());
holder.setTitle(model.getTitle());
Log.w("ok","ok");
}
How can i show them in my view.

You may try this...
recyclerView = (RecyclerView)findViewById(R.id.mRecyclerView);
recyclerView.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(llm);

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()));

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

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

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

Related

FirebaseRecyclerOptions with spinner onItemSelected query issue

Attempting Horizontal Firebase RecyclerView with MultiViews

setAdapter in RecyclerView cannot be applied to FirebaseRecyclerAdapter

Retrieve data from onbindviewholder using FirebaseRecyclerAdapter android

Firestore Recyclerview: No content is being loaded

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