I try this one but can't see any post on search.
Private void firebaseSearch(String PostSearch){
String query = PostSearch.toLowerCase();
Query postsQuery =mDatabase.child(POSTS).limitToFirst(POSTS_QUERY_LIMIT).startAt(query).endAt(query + "\uf8ff");
mDatabase.keepSynced(true);
setUpRecyclerView();
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
hideProgressDialog();
if( !isPopulateViewHolderCalled) showPostsList(true);
}
}, HANDLER_DELAY);
FirebaseRecyclerOptions<Post> options =
new FirebaseRecyclerOptions.Builder<Post>()
.setQuery(postsQuery, Post.class)
.build();
mAdapter = new FirebaseRecyclerAdapter<Post, PostViewHolder>(options) {
#NonNull
#Override
public PostViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_post, parent, false);
return new PostViewHolder(view);
}
Related
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();
}
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();
}
}
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);
I am trying to search for the information in my firebase db, and I am not able to do so.
This is the class in which I'm searching from:
private FirebaseRecyclerAdapter<DjProfile, ResultsViewHolder> firebaseRecyclerAdapter;
public static Query query;
public static String searchData;
DatabaseReference mProfileDatabase;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_attendee_landing);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final RecyclerView recyclerView = findViewById(R.id.results_recycler);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
final EditText t = (EditText) findViewById(R.id.DjNameET);
mProfileDatabase = FirebaseDatabase.getInstance().getReference();
t.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) {
if(i == EditorInfo.IME_ACTION_SEARCH)
{
searchData = t.getText().toString();
return true;
}
return false;
}
});
ImageButton imgB= (ImageButton) findViewById(R.id.searchBtn);
imgB.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view)
{
query = mProfileDatabase.orderByChild("djprofile")
.startAt(searchData)
.endAt(searchData + "\uf8ff");
}
});
FirebaseRecyclerOptions<DjProfile> firebaseRecyclerOptions = new FirebaseRecyclerOptions.Builder<DjProfile>()
.setQuery(query, DjProfile.class)
.build();
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<DjProfile, ResultsViewHolder>(firebaseRecyclerOptions)
{
#NonNull
#Override
public ResultsViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.searchitem_list, viewGroup, false);
return new ResultsViewHolder(view);
}
#Override
protected void onBindViewHolder(#NonNull ResultsViewHolder holder, int position, #NonNull DjProfile model) {
holder.setDjProfile(model);
}
};
recyclerView.setAdapter(firebaseRecyclerAdapter);
}
#Override
protected void onStart()
{
super.onStart();
firebaseRecyclerAdapter.startListening();
}
Here is the exception I am getting: (says to be occuring in the onStart() method)
java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.firebase.database.ChildEventListener com.google.firebase.database.Query.addChildEventListener(com.google.firebase.database.ChildEventListener)' on a null object reference
Any help as to why this is null would be greatly appreciated!
To be able to initialize the adapter, you need to have a valid query. And to be able to create the query, you need to have the searchData. This means that the initialization of the firebaseRecyclerAdapter should happen inside the onClick.
imgB.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view)
{
query = mProfileDatabase.orderByChild("djprofile")
.startAt(searchData)
.endAt(searchData + "\uf8ff");
FirebaseRecyclerOptions<DjProfile> firebaseRecyclerOptions = new FirebaseRecyclerOptions.Builder<DjProfile>()
.setQuery(query, DjProfile.class)
.build();
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<DjProfile, ResultsViewHolder>(firebaseRecyclerOptions)
{
#NonNull
#Override
public ResultsViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.searchitem_list, viewGroup, false);
return new ResultsViewHolder(view);
}
#Override
protected void onBindViewHolder(#NonNull ResultsViewHolder holder, int position, #NonNull DjProfile model) {
holder.setDjProfile(model);
}
};
recyclerView.setAdapter(firebaseRecyclerAdapter);
}
});
Right now I'm just trying to use Firebase UI 3.1.1 to populate a recycler view. All the tutorials im seeing are outdated, and the ones that are dated are incomplete. This is what i have so far...
private void setUpFirebaseAdapter() {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference(Constants.LOBBIES);
Query query = reference;
mRecyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
FirebaseRecyclerOptions lobbyOptions = new FirebaseRecyclerOptions.Builder<Lobby>().setQuery(query, Lobby.class).build();
mLobbyAdapter = new FirebaseRecyclerAdapter<Lobby, LobbyViewHolder>(lobbyOptions) {
#Override
protected void onBindViewHolder(#NonNull LobbyViewHolder holder, int position, #NonNull Lobby model) {
holder.
}
#Override
public LobbyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return null;
}
};
}
what do i put in holder so i can complete the recycler view? Thanks!
EDIT. Here's my View holder class too
public class LobbyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
View mView;
Context mContext;
public LobbyViewHolder(View itemView) {
super(itemView);
mView = itemView;
mContext = itemView.getContext();
itemView.setOnClickListener(this);
}
public void bindLobby(Lobby lobby) {
TextView nameTextView = (TextView) mView.findViewById(R.id.lobby_name_text);
TextView locationTextView = (TextView) mView.findViewById(R.id.lobby_location_text);
TextView sizeTextView = (TextView) mView.findViewById(R.id.lobby_size_text);
TextView priceTextView = (TextView) mView.findViewById(R.id.lobby_price_text);
TextView dateTextView = (TextView) mView.findViewById(R.id.lobby_date_text);
nameTextView.setText(lobby.getOwner());
locationTextView.setText(lobby.getLocation());
sizeTextView.setText(lobby.getTotalMembers());
priceTextView.setText("Php " + lobby.getCost());
dateTextView.setText(lobby.getDateText());
}
#Override
public void onClick(View v) {
final ArrayList<Lobby> lobbies = new ArrayList<>();
DatabaseReference ref = FirebaseDatabase.getInstance().getReference(Constants.LOBBIES);
ref.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot snapshot : dataSnapshot.getChildren()){
lobbies.add(snapshot.getValue(Lobby.class));
}
int itemPosition = getLayoutPosition();
Intent intent = new Intent(mContext, LobbyDetailActivity.class);
intent.putExtra("position", itemPosition + "");
intent.putExtra("lobbies", Parcels.wrap(lobbies));
mContext.startActivity(intent);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
From what I'm seeing you're not inflating the layout view (onCreateViewHolder) too, Do it like this:
private void setUpFirebaseAdapter() {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference(Constants.LOBBIES);
Query query = reference;
mRecyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
FirebaseRecyclerOptions lobbyOptions = new FirebaseRecyclerOptions.Builder<Lobby>().setQuery(query, Lobby.class).build();
mLobbyAdapter = new FirebaseRecyclerAdapter<Lobby, LobbyViewHolder>(lobbyOptions) {
#Override
protected void onBindViewHolder(#NonNull LobbyViewHolder holder, int position, #NonNull Lobby model) {
holder.bindLobby(model);
//here you associate the holder views with the model attributes
}
#Override
public LobbyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.your_layout_file, parent, false);
return new LobbyViewHolder(view);
}
};
}