I am trying to retrieve some data from Firebase Firestore although I am able to show the data on Logcat window but when I add it into my recycler view it doesn't show , recycler view doesn't inflate. I am unable to figure it out what I am currently missing although code runs without any error.
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private CollectionReference sellerRef;
RecyclerView mRecyclerView;
List<Products> mProducts;
Adapter adapter;
String TAG="MyTag";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.mRecyclerView);
mProducts=new ArrayList<>();
GridLayoutManager gridLayoutManager = new GridLayoutManager(this,2,GridLayoutManager.VERTICAL,false);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(gridLayoutManager);
adapter = new Adapter(this,mProducts);
mRecyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
sellerRef=db.collection("Sellers");
Query query =sellerRef.whereEqualTo("City_Name","Sydney");
query.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
#Override
public void onComplete(#NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()){
for (QueryDocumentSnapshot document : task.getResult()) {
Products products =document.toObject(Products.class);
mProducts.add(products);
Log.d(TAG,""+products.getCity_Name()+" "+mProducts.size());
}
}else {
Toast.makeText(MainActivity.this, "Failed to load Data", Toast.LENGTH_SHORT).show();
}
}
});
}
}
Adapter
private Context mContext;
private List<Products> mProducts;
String TAG = "AdTag";
public Adapter(Context mContext, List<Products> mProducts) {
this.mContext = mContext;
this.mProducts= mProducts;
}
#NonNull
#Override
public Adapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(mContext).inflate(R.layout.grid_view_layout,parent,false);
return new Adapter.ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull Adapter.ViewHolder holder, int position) {
Products products=mProducts.get(position);
holder.title.setText(products.getCity_Name());
if (products.getThumbnailUrl().equals("default")){
holder.gridIcon.setImageResource(R.mipmap.ic_launcher);
} else {
Glide.with(mContext).load(products.getThumbnailUrl()).into(holder.gridIcon);
}
}
#Override
public int getItemCount() {
return mProducts.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
public TextView title;
public ImageView gridIcon;
public ViewHolder(#NonNull View itemView) {
super(itemView);
title=itemView.findViewById(R.id.textView2);
gridIcon=itemView.findViewById(R.id.imageView2);
}
}
}
Call adapter.notifyDataSetChanged(); after update data
Related
I am creating an Android app which is based on wallpaper. I have different categories in my app that shows images and after clicking on particular image it will show full image. The problem is when I click on any categories the images are shown are very slow. I am retrieving images from firebase realtime database. I am showing images in grid layout in two columns. I have also compress all the images then to the process of showing images is very slow.
This is one of the category code.
public class AnimalWallpaper extends AppCompatActivity {
private RecyclerView recyclerView;
private ProgressBar progressBar;
private DatabaseReference reference;
private ArrayList<String> list;
private WallpaperAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_animal_wallpaper);
reference = FirebaseDatabase.getInstance().getReference().child("animal");
recyclerView = findViewById(R.id.recyclerViewAnimal);
progressBar = findViewById(R.id.progressBarAnimal);
getData();
}
private void getData() {
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull #NotNull DataSnapshot snapshot) {
progressBar.setVisibility(View.GONE);
list = new ArrayList<>();
for (DataSnapshot shot : snapshot.getChildren()) {
String data = shot.getValue().toString();
list.add(data);
}
recyclerView.setLayoutManager(new GridLayoutManager(AnimalWallpaper.this, 2));
adapter = new WallpaperAdapter(list, AnimalWallpaper.this);
recyclerView.setAdapter(adapter);
progressBar.setVisibility(View.GONE);
}
#Override
public void onCancelled(#NonNull #NotNull DatabaseError error) {
progressBar.setVisibility(View.GONE);
Toast.makeText(AnimalWallpaper.this, "Error : "+error.getMessage() , Toast.LENGTH_SHORT).show();
}
});
}
}
This is wallpaperadapter class code.
public class WallpaperAdapter extends RecyclerView.Adapter<WallpaperAdapter.WallpaperViewHolder> {
private ArrayList<String> list;
private Context context;
public WallpaperAdapter(ArrayList<String> list, Context context) {
this.list = list;
this.context = context;
}
#NonNull
#org.jetbrains.annotations.NotNull
#Override
public WallpaperViewHolder onCreateViewHolder(#NonNull #org.jetbrains.annotations.NotNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.custom_image_layout, parent, false );
return new WallpaperViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull #org.jetbrains.annotations.NotNull WallpaperAdapter.WallpaperViewHolder holder, int position) {
Glide.with(context).load(list.get(position)).into(holder.imageView);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(context, FullImageActivity.class);
intent.putExtra("images", list.get(position));
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return list.size();
}
public class WallpaperViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
public WallpaperViewHolder(#NonNull #NotNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.item_image);
}
}
}
I have two Models (ModelChat and ModelUsers) and their class adapters (PostsAdapter and AllUsersAdapter).
I want to get and set user info such as name and email from the ModelUser and get and set post information from the ModelPost from Firebase database into the same recyclerview in my HomeActivity.
The codes are as shown below:
PostsAdapter.java
public class PostsAdapter extends RecyclerView.Adapter<PostsAdapter.MyHolder>{
Context context;
List<ModelPost> postList;
public PostsAdapter(Context context, List<ModelPost> postList) {
this.context = context;
this.postList = postList;
}
#NonNull
#Override
public MyHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//inflate layout row_post.xml
View view = LayoutInflater.from(context).inflate(R.layout.row_posts, parent, false);
return new MyHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyHolder holder, int position) {
//get data
String userUID = postList.get(position).getUserUID();
String userEmail = postList.get(position).getUserEmail();
String userProfilePic = postList.get(position).getUserProfilePic();
String firstName = postList.get(position).getUserFirstName();
String lastName = postList.get(position).getUserLastName();
String userNickName = postList.get(position).getUserNickName();
String postTimeStamp = postList.get(position).getPostTime();
String userPost = postList.get(position).getUserPost();
//set data
//set data
Glide
.with(context)
.load(userProfilePic)
.apply(RequestOptions.circleCropTransform())
.into(holder.avatarTv);
holder.firstnameTv.setText(firstName);
holder.lastnameTv.setText(lastName);
holder.nicknameTv.setText(userNickName);
}
#Override
public int getItemCount() {
return postList.size();
}
//view holder class
class MyHolder extends RecyclerView.ViewHolder {
//views from row_posts layout
public MyHolder(#NonNull View itemView) {
super(itemView);
//init view
//my views here
}
}
}
AllUsersAdapter.java
public class AllUsersAdapter extends RecyclerView.Adapter<AllUsersAdapter.MyHolder>{
Context context;
List<ModelUser> userList;
//Constructor > Generate
public AllUsersAdapter(Context context, List<ModelUser> userList) {
this.context = context;
this.userList = userList;
}
#NonNull
#Override
public MyHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//Inflate layout (row_user)
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_all_users, parent, false);
return new MyHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyHolder holder, int position) {
//get data
String userUID = userList.get(position).getUid();
String userProfilePic = userList.get(position).getProfilepic();
String userName = userList.get(position).getFirstname() + " " + userList.get(position).getLastname();
String userNickname = userList.get(position).getNickname();
String userStatus = userList.get(position).getStatus();
//set data
Glide
.with(context)
.load(userProfilePic)
.apply(RequestOptions.circleCropTransform())
.into(holder.mAvatarIv);
holder.mNameTv.setText(userName);
holder.mNicknameTv.setText(userNickname);
holder.mStatusTv.setText(userStatus);
//Handle item click
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/*Click user from user list to start conversation
*Start Activity by putting UID of receiver
*we will use that UID to identify the user we are gonna chat */
Intent intent = new Intent(context, MessageActivity.class);
intent.putExtra("userUid", userUID);
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return userList.size();
}
class MyHolder extends RecyclerView.ViewHolder {
public MyHolder(#NonNull View itemView) {
super(itemView);
//init my views here
}
}
}
HomeActivity.java
public class HomeActivity extends AppCompatActivity {
FirebaseAuth firebaseAuth;
RecyclerView recyclerView;
List<ModelPost> postList;
PostsAdapter postsAdapter;
String mUID;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
firebaseAuth = FirebaseAuth.getInstance();
//recyclerview and its properties
recyclerView = findViewById(R.id.posts_recyclerview);
//init post list
postList = new ArrayList<>();
loadPosts();
}
private void loadPosts() {
//path of all posts
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Posts");
//get all data from this reference
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
postList.clear();
for (DataSnapshot ds: snapshot.getChildren()) {
ModelPost modelPost = ds.getValue(ModelPost.class);
postList.add(modelPost);
//adapter
postsAdapter = new PostsAdapter(HomeActivity.this, postList);
//set adapter to recyclerview
recyclerView.setAdapter(postsAdapter);
}
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
//in case of errors
//Toast.makeText(HomeActivity.this, ""+error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
}
Try using ConcatAdapter.
An RecyclerView.Adapter implementation that presents the contents of multiple adapters in sequence. More info
Concatenate adapters sequentially with ConcatAdapter:
https://medium.com/androiddevelopers/merge-adapters-sequentially-with-mergeadapter-294d2942127a
I think this will help
MyAdapter adapter1 = ...;
AnotherAdapter adapter2 = ...;
ConcatAdapter concatenated = new ConcatAdapter(adapter1, adapter2);
recyclerView.setAdapter(concatenated);
i have a document inside firestore, that document also has a list inside is called "foods". I want to be able to load only that list of "foods" into a recyclerview, I'm not sure how to query the list for recycler options. Here is what the DB structure looks like:
Here is my Adapter
List<Order> myOrders;
public OrderDetailAdapter(#NonNull FirestoreRecyclerOptions<Order> options) {
super(options);
}
#Override
protected void onBindViewHolder(#NonNull OrderDetailAdapter.DetailsHolder holder, int position, #NonNull Order model) {
Order order = myOrders.get(position);
holder.product_name.setText(model.getProductName());
holder.product_price.setText(model.getPrice());
holder.product_quantity.setText(model.getQuantity());
holder.product_discount.setText(model.getDiscount());
}
#NonNull
#Override
public OrderDetailAdapter.DetailsHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.order_item_layout, parent,false);
return new DetailsHolder(v);
}
public class DetailsHolder extends RecyclerView.ViewHolder {
TextView product_name, product_price, product_discount, product_quantity;
public DetailsHolder(#NonNull View itemView) {
super(itemView);
product_name = itemView.findViewById(R.id.product_name);
product_price = itemView.findViewById(R.id.product_price);
product_discount = itemView.findViewById(R.id.product_discount);
product_quantity = itemView.findViewById(R.id.product_quantity);
}
}
#Override
public int getItemCount() {
return myOrders.size();
}
}
Here is my Activity:
private FirebaseFirestore db = FirebaseFirestore.getInstance();
DocumentReference documentReference;
TextView order_id, order_comment, order_date, order_total;
String order_id_value ="";
RecyclerView lstFoods;
RecyclerView.LayoutManager layoutManager;
OrderDetailAdapter orderAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order_details);
if (getIntent() !=null)
order_id_value = getIntent().getStringExtra("order_number");
documentReference = db.collection("Requests").document(order_id_value);
lstFoods = findViewById(R.id.food_list);
lstFoods.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
lstFoods.setLayoutManager(layoutManager);
order_id.setText(order_id_value);
documentReference.addSnapshotListener(new EventListener<DocumentSnapshot>() {
#Override
public void onEvent(#Nullable DocumentSnapshot documentSnapshot, #Nullable FirebaseFirestoreException e) {
if (documentSnapshot.exists()){
Order order = documentSnapshot.toObject(Order.class);
orderAdapter.notifyDataSetChanged();
lstFoods.setAdapter(orderAdapter);
}else{
Log.d("TAG", "ERROR");
}
}
});
}
#Override
protected void onStart() {
super.onStart();
orderAdapter.startListening();
}
#Override
protected void onStop() {
super.onStop();
orderAdapter.stopListening();
}
}
When i try to run it i get the following error:
error: incompatible types: List cannot be converted to FirestoreRecyclerOptions
super(options);
My recyclerview always reset to first position after new data is inserted to firebase. In my TestAdapter class, I have an onClickListener which increments like on a post when clicked. Whenever I click on this "like" button, view is reset to first position. I believe this issue is related to setAdapter() being called on data changed. Please help!
MainActivity fetches "post" data from Firebase and populates it in TestAdapter class.
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private TestAdapter testAdapter;
private ArrayList<Post> postList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
fetchPostFromDB();
}
private void fetchPostFromDB() {
DatabaseReference databaseRef = FirebaseDatabase.getInstance().getReference("Post");
databaseRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
postList = new ArrayList<>();
for (DataSnapshot snap : snapshot.getChildren()) {
String post = snap.child("post").getValue().toString();
Post post = new Post(post);
postList.add(post);
}
testAdapter = new TestAdapter(getApplicationContext(), postList);
recyclerView.setAdapter(testAdapter);
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
TestAdapter binds the data (postList) and has an onClickListener.
public class TestAdapter extends RecyclerView.Adapter<TestAdapter.TestHolder> {
private List<Post> postList;
private Context context;
private DatabaseReference databaseReference;
public TestAdapter(Context ct, ArrayList<Post> postList) {
context = ct;
this.postList = postList;
}
#NonNull
#Override
public TestHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.post_item, parent, false);
final TestHolder holder = new TestHolder(view);
holder.ibLike.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String postID = postList.get(holder.getAdapterPosition()).getPostID();
databaseReference = FirebaseDatabase.getInstance().getReference("Posts").child(postID).child("likes");
int incrementLike = postList.get(holder.getAdapterPosition()).getLikes() + 1;
databaseReference.setValue(incrementLike);
}
});
return holder;
}
#Override
public void onBindViewHolder(#NonNull final TestHolder holder, final int position) {
holder.tvPost.setText(postList.get(position).getPost());
holder.tvVotes.setText(Integer.toString(postList.get(position).getLikes()));
}
#Override
public int getItemCount() {
return postList.size();
}
public static class TestHolder extends RecyclerView.ViewHolder {
TextView tvPost, tvLikes;
ImageButton ibLike;
public TestHolder(#NonNull View itemView) {
super(itemView);
tvPost = itemView.findViewById(R.id.tvPost);
tvLikes = itemView.findViewById(R.id.tvLikes);
ibLike = itemView.findViewById(R.id.ibLike);
}
}
Here need to initialize your adapter class from main activity. and then when data received just call adapter.notifiyDatasetChanged like:
onCreate():
postList = new ArrayList<>();
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
testAdapter = new TestAdapter(getApplicationContext(), postList);
recyclerView.setAdapter(testAdapter);
and from your fetchPostFromDB delete adapter initialization insted of this just put this line testAdapter.notifiyDataSetChanged()
And when click on text button you can update/handle like this:
holder.ibLike.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String postID = postList.get(holder.getAdapterPosition()).getPostID();
databaseReference = FirebaseDatabase.getInstance().getReference("Posts").child(postID).child("likes");
int incrementLike = postList.get(holder.getAdapterPosition()).getLikes() + 1;
postList.get(holder.getAdapterPosition()).setLikes(incrementLike);
databaseReference.setValue(incrementLike);
notifyDataSetChanged();
}
});
Here is my fragment
public class TransactionsFragment extends Fragment {
private FirebaseAuth mAuth;
private DatabaseReference mDBref;
FirebaseUser Fuser;
private String UID;
private RecyclerView recyclerView;
private RecyclerView.Adapter trpAdapter;
private List<TransGetterSetter> DataList;
String trans_id;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_transactions, container, false);
DataList = new ArrayList<>();
recyclerView = (RecyclerView) v.findViewById(R.id.RVList);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
TransactionRVAdapter trvAdapter = new TransactionRVAdapter(DataList, getContext());
recyclerView.setAdapter(trvAdapter);
mAuth = FirebaseAuth.getInstance();
mDBref = FirebaseDatabase.getInstance().getReference();
Fuser = mAuth.getInstance().getCurrentUser();
UID = Fuser.getUid();
mDBref.child("transactions").child(UID).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot chidSnap : dataSnapshot.getChildren()) {
trans_id = chidSnap.getKey();
DataList.add(new TransGetterSetter("" + trans_id));
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
trvAdapter.notifyDataSetChanged();
return v;
}
}
If i toast "trans_id" string im getting expected result.
Here is My Adapter class
public class TransactionRVAdapter extends RecyclerView.Adapter<TransactionRVAdapter.rvViewHolder> {
Context mContext;
List<TransGetterSetter> DataList = new ArrayList<>();
public class rvViewHolder extends RecyclerView.ViewHolder{
private TextView TransId;
public rvViewHolder(#NonNull View itemView) {
super(itemView);
TransId = (TextView) itemView.findViewById(R.id.TransIdTxt);
}
}
public TransactionRVAdapter( List<TransGetterSetter> DataList,Context mContext){
this.DataList = DataList;
this.mContext = mContext;
}
#NonNull
#Override
public rvViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
LayoutInflater inflater = LayoutInflater.from(mContext);
View view = inflater.inflate(R.layout.fragment_transactions_item, viewGroup, false);
return new rvViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull rvViewHolder rvViewHolder, int i) {
rvViewHolder.TransId.setText(DataList.get(i).getTrans_id());
}
#Override
public int getItemCount() {
return DataList.size();
}
}
Here is my GetterSetter class
public class TransGetterSetter {
private String trans_id;
public TransGetterSetter() {
}
public TransGetterSetter(String trans_id) {
this.trans_id = trans_id;
}
public String getTrans_id() {
return trans_id;
}
public void setTrans_id(String trans_id) {
this.trans_id = trans_id;
}
}
Im able to get Data from firebase, but when i try to add it to recycler view it dosen't show any data. Recycler view is showing empty. I checked my code many time but haven't found solution.
You should call :
trvAdapter.notifyDataSetChanged();
After the for loop inside the (onDataChange) event listener.
Try to called ..
DataList.add(new TransGetterSetter("" + trans_id));
after this line called ..
trvAdapter.notifyDataSetChanged();