I am trying to show some items in a RecyclerView and such items are contained in an ArrayList populated with RealtimeDatabase (Firebase) data. This is done every time some changes are detected in the db as follows. The problem is that lstCompany becomes null soon after the addValueEventListener. How can I keep it fulfilled?
public class FragmentCompanies extends Fragment {
View v;
private RecyclerView recyclerView;
private List<Company> lstCompany;
DatabaseReference db;
public FragmentCompanies(){}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
db = FirebaseDatabase.getInstance().getReference();
db.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
lstCompany = new ArrayList<>();
DataSnapshot ds = dataSnapshot.child("Company");
for (DataSnapshot company: ds.getChildren()){
Map<String, String> currCompany = (Map) company.getValue();
Company c = new Company(currCompany.get("name"), currCompany.get("overview"), currCompany.get("imageURL"));
lstCompany.add(c);
System.out.println(lstCompany);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
System.out.println(lstCompany);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState){
v = inflater.inflate(R.layout.fragment_companies,container,false);
System.out.println(lstCompany);
//bind the adapter to the recyclerView
recyclerView = v.findViewById(R.id.companies_recyclerview);
CompaniesRecyAdapter recyAdapter = new CompaniesRecyAdapter(getContext(), lstCompany);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(recyAdapter);
return v;
}
}
The last two println operations return null and it should not happen.
intialize the arraylist in onCreate, and when add data in on onDataChange and notify the adapter that data has been changed
public class FragmentCompanies extends Fragment {
View v;
private RecyclerView recyclerView;
private List<Company> lstCompany;
DatabaseReference db;
public FragmentCompanies(){}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState){
v = inflater.inflate(R.layout.fragment_companies,container,false);
lstCompany = new ArrayList<>();
System.out.println(lstCompany);
//bind the adapter to the recyclerView
recyclerView = v.findViewById(R.id.companies_recyclerview);
CompaniesRecyAdapter recyAdapter = new CompaniesRecyAdapter(getContext(), lstCompany);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(recyAdapter);
db = FirebaseDatabase.getInstance().getReference();
db.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
DataSnapshot ds = dataSnapshot.child("Company");
for (DataSnapshot company: ds.getChildren()){
Map<String, String> currCompany = (Map) company.getValue();
Company c = new Company(currCompany.get("name"), currCompany.get("overview"), currCompany.get("imageURL"));
lstCompany.add(c);
System.out.println(lstCompany);
System.out.println(c.getCompanyName);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
System.out.println(lstCompany);
return v;
}
}
Related
I'm creating app with Firebase implementation. Now I'm stuck with showing list of data using recyclerView. After using my code I have empty activity without any error in Logcat but when turn off my mobile power button and again start then data show on recycleView. Also one thing when I go another activity and open this activity then again show blank page. I need someone's help :(
This is my fragment:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_message, container, false);
// Initialize
recyclerView = view.findViewById(R.id.recycleView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
list = new ArrayList<>();
// For retrieve Chat User ID
databaseReference = FirebaseDatabase.getInstance().getReference().child("Chat");
databaseReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
list.clear();
for (DataSnapshot ds : snapshot.getChildren()) {
receiveID = ds.getKey();
// Restore Data on model class name UserDataInfo
databaseReference = FirebaseDatabase.getInstance().getReference().child("UsersData").child(receiveID);
databaseReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
String userName = String.valueOf(snapshot.child("userName").getValue());
String userNumber = String.valueOf(snapshot.child("userPhone").getValue());
String userType = String.valueOf(snapshot.child("userType").getValue());
String userImage = String.valueOf(snapshot.child("userName").getValue());
info = new UserDataInfo(userImage, userType, userNumber, userName, receiveID);
list.add(info);
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
// End
}
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
adapter = new messageListAdapter(list, getContext());
recyclerView.setAdapter(adapter);
}
My Adapter:
public class messageListAdapter extends RecyclerView.Adapter<messageListAdapter.ViewHolder> {
List<UserDataInfo> infoList;
Context context;
public messageListAdapter(List<UserDataInfo> infoList, Context context) {
this.infoList = infoList;
this.context = context;
}
#NonNull
#Override
public messageListAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.message_list_show_admin, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull messageListAdapter.ViewHolder holder, int position) {
final UserDataInfo userDataInfo = infoList.get(position);
holder.Name.setText(userDataInfo.getUserName());
holder.Number.setText(userDataInfo.getUserPhone());
holder.whichType.setText(userDataInfo.getUserType());
holder.linearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, "ID: " + userDataInfo.getReceiveID(), Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return infoList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView Image;
TextView Name, Number, whichType;
LinearLayout linearLayout;
public ViewHolder(#NonNull View itemView) {
super(itemView);
Image = itemView.findViewById(R.id.UserImage);
Name = itemView.findViewById(R.id.Name);
Number = itemView.findViewById(R.id.Number);
whichType = itemView.findViewById(R.id.WhichType);
linearLayout = itemView.findViewById(R.id.Linear_layout);
}
}
}
my Firebase DataBase setup:
Database image
Database image
Im facing this issue due to the asynchronous nature of Firebase database in my quiz app.Question score contains the current user and its score .Ranking contains the users and their corresponding marks.Question score has the score stored in it but when i am updating the ranking database with the score ... The value of marks in Ranking object is being reset to zero.How should i approach this?
I've already tried using Ranking Callback to update the database but no luck.
public class RankingFragment extends Fragment {
View myFragment;
RecyclerView rankingList;
LinearLayoutManager layoutManager;
FirebaseRecyclerAdapter<Ranking, RankingViewHolder> adapter;
FirebaseDatabase database;
DatabaseReference questionScore, rankingTbl;
String k;
int sum=0;
public static RankingFragment newInstance() {
RankingFragment rankingFragment = new RankingFragment();
return rankingFragment;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
database = FirebaseDatabase.getInstance();
questionScore = database.getReference("Question_Score");
rankingTbl = database.getReference("Ranking");
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
myFragment = inflater.inflate(R.layout.fragment_ranking, container, false);
rankingList = (RecyclerView) myFragment.findViewById(R.id.rankingList);
layoutManager = new LinearLayoutManager(getActivity());
rankingList.setHasFixedSize(true);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
rankingList.setLayoutManager(layoutManager);
updateScore(Common.currentUser.getUsername());
return myFragment;
}
private void updateScore(final String username)
{
questionScore.orderByChild("user").equalTo(username).addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot data : dataSnapshot.getChildren()) {
QuestionScore ques = data.getValue(QuestionScore.class);
sum+=Integer.parseInt(ques.getScore());
}
Ranking ranking = new Ranking(username, sum);
rankingTbl.child(ranking.getUsername()).setValue(ranking);
adapter = new FirebaseRecyclerAdapter<Ranking, RankingViewHolder>(
Ranking.class, R.layout.layout_ranking, RankingViewHolder.class, rankingTbl.orderByChild("marks")
) {
#Override
protected void populateViewHolder(final RankingViewHolder viewHolder, Ranking model, int position) {
viewHolder.txt_name.setText(model.getUsername());
viewHolder.txt_score.setText(String.valueOf(model.getMarks()));
}
};
finish();
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
private void finish() {
adapter.notifyDataSetChanged();
rankingList.setAdapter(adapter);
}
}
The marks of the ranking database are storing 0 and thus the view holder is also populated with zero whereas it should store the score of the current user(stored in "sum+=Integer.parseInt(ques.getScore());"
You are assigning the value from QuestionScore to sum instead it should be like adding all the QuestionScore values
for (DataSnapshot data : dataSnapshot.getChildren()) {
QuestionScore ques = data.getValue(QuestionScore.class);
sum+=Integer.parseInt(ques.getScore()); // <--- changed = to +=
}
I want to add an object called funny_momments_row to an ArrayList called data, but it is not adding. I am checking that data is empty or not using isEmpty method afterwards. The code is running fine until this line:
funny_momments_row current = new funny_momments_row(dataSnapshot.child("like").getValue().toString(),dataSnapshot.child("url").getValue().toString());
Here is the complete class:
public class funny_moments extends Fragment {
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("funnymomments");
ArrayList<funny_momments_row> data;
TextView tesgting;
private RecyclerView mRecyclerView;
public funny_moments() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_funny_moments, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recylerview);
tesgting = (TextView) view.findViewById(R.id.test);
data = new ArrayList<>();
getData();
// Inflate the layout for this fragment
return view;
}
public void getData() {
funny_momments_row lu = new funny_momments_row("1", "hi");
myRef.child("video 0").setValue(lu);
myRef.child("video 0").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot videoSnapshot: dataSnapshot.getChildren()) {
funny_momments_row current = new funny_momments_row(dataSnapshot.child("like").getValue().toString(), dataSnapshot.child("url").getValue().toString());
data.add(current);
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
if (data.isEmpty()) {
tesgting.setText("hi");
}
}
}
Try this because videoSnapsot is the data you need to add in the array list.
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot videoSnapshot: dataSnapshot.getChildren()) {
data.add(videoSnapshot.getValue(funny_momments_row.class));
//Create getter/setter method in funny_momments_row class if needed.
}
}
And, for funny_momments_row, java naming convention, please.
I get this error and I dont know how to fix it
java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
at java.util.ArrayList.get(ArrayList.java:411)
at com.tijdelijk.firebasetest.Start$1.populateViewHolder(Start.java:69)
at com.tijdelijk.firebasetest.Start$1.populateViewHolder(Start.java:64)
I am working with firebase database and based on CategoryId I put the items in a arraylist for the SubCategories my code:
public class CategoryFragment extends Fragment {
View myFragment;
RecyclerView listCategory;
RecyclerView.LayoutManager layoutManager;
FirebaseRecyclerAdapter<Category, CategoryViewHolder> adapter;
FirebaseDatabase database;
DatabaseReference categories;
DatabaseReference subCategory;
public static CategoryFragment newInstance() {
CategoryFragment fragment = new CategoryFragment();
return fragment;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
database = FirebaseDatabase.getInstance();
categories = database.getReference("Category");
subCategory = database.getReference("SubCategory");
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
myFragment = inflater.inflate(R.layout.fragment_category, container, false);
listCategory = (RecyclerView) myFragment.findViewById(R.id.listCategory);
listCategory.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(container.getContext());
listCategory.setLayoutManager(layoutManager);
loadCategories();
return myFragment;
}
private void loadCategories() {
adapter = new FirebaseRecyclerAdapter<Category, CategoryViewHolder>(
Category.class,
R.layout.category_layout,
CategoryViewHolder.class,
categories
) {
#Override
protected void populateViewHolder(CategoryViewHolder viewHolder, final Category model, int position) {
viewHolder.category_name.setText(model.getName());
Picasso.with(getActivity())
.load(model.getImage())
.into(viewHolder.category_image);
viewHolder.setItemClickListener(new ItemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Intent startGame = new Intent(getActivity(), Start.class);
Common.categoryId = adapter.getRef(position).getKey();
loadSubCategory(Common.categoryId);
startActivity(startGame);
}
});
}
};
adapter.notifyDataSetChanged();
listCategory.setAdapter(adapter);
}
private void loadSubCategory(String categoryId) {
//Clear list if there are old subCategory
if (Common.subCategoryList.size() > 0) {
Common.subCategoryList.clear();
}
subCategory.orderByChild("CategoryId").equalTo(categoryId)
.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
SubCategory ques = postSnapshot.getValue(SubCategory.class);
Common.subCategoryList.add(ques);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
in this activity I want to display also a recyclerview but this time based on the arraylist I got from the categoryfragment here is my code:
public class Start extends AppCompatActivity {
FirebaseDatabase database;
DatabaseReference subCategory;
FirebaseRecyclerAdapter<SubCategory, SubCategoryViewHolder> adapter;
RecyclerView listSubCategory;
RecyclerView.LayoutManager layoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
database = FirebaseDatabase.getInstance();
subCategory = database.getReference("SubCategory");
listSubCategory = findViewById(R.id.listSubCategory);
listSubCategory.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(getBaseContext());
listSubCategory.setLayoutManager(layoutManager);
loadSubCategories();
adapter.notifyDataSetChanged();
listSubCategory.setAdapter(adapter);
}
private void loadSubCategories() {
adapter = new FirebaseRecyclerAdapter<SubCategory, SubCategoryViewHolder>(
SubCategory.class,
R.layout.subcategory_layout,
SubCategoryViewHolder.class,
subCategory
) {
#Override
protected void populateViewHolder(SubCategoryViewHolder viewHolder, SubCategory model, int position) {
viewHolder.subcategory_nlname.setText(Common.subCategoryList.get(position).getLatijnseNaam());
viewHolder.subcategory_ltname.setText(Common.subCategoryList.get(position).getNederlandseNaam());
viewHolder.setItemClickListener(new ItemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Intent startGame = new Intent(Start.this, Start.class);
Common.categoryId = adapter.getRef(position).getKey();
startActivity(startGame);
}
});
}
};
}
}
here is my viewholder:
public class SubCategoryViewHolder extends RecyclerView.ViewHolder
implements View.OnClickListener{
public TextView subcategory_nlname;
public TextView subcategory_ltname;
private ItemClickListener itemClickListener;
public SubCategoryViewHolder(View itemView) {
super(itemView);
subcategory_ltname = itemView.findViewById(R.id.latijnse_naam);
subcategory_nlname = itemView.findViewById(R.id.nederlandse_naam);
// itemView.findViewById(R.id.btnPlay).setOnClickListener(this);
}
public void setItemClickListener(ItemClickListener itemClickListener) {
this.itemClickListener = itemClickListener;
}
#Override
public void onClick(View view) {
itemClickListener.onClick(view,getAdapterPosition(),false);
}
}
IndexOutOfBoundException means that you are trying to access a value that is at an index out of the array.
In your case, you have an array of two values. So you have the keys 0 and 1. As said in the error, your code is trying to access the index 2, which does not exist.
You have to check that you are accessing an index that is in the range of values of the array.
Good day to you.
This is the edited version of my Fragment class inside my main activity. There were some bugs- it was not displaying anything and it was no longer saving the data to the database.
public static class DummyFragment extends Fragment {
int color;
public DummyFragment() {
}
#SuppressLint("ValidFragment")
public DummyFragment(int color) {
this.color = color;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dummy_fragment, container, false);
final RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.dummyfrag_scrollableview);
final FrameLayout frameLayout = (FrameLayout) view.findViewById(R.id.dummyfrag_bg);
frameLayout.setBackgroundColor(color);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setHasFixedSize(true);
DatabaseReference mDatabaseGig;
final List<Dessert> dessertList;
// get the gig database
mDatabaseGig = FirebaseDatabase.getInstance().getReference("Gig Posts");
dessertList = new ArrayList<>();
mDatabaseGig.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
// dessertList.clear();
for(DataSnapshot gigSnapshot: dataSnapshot.getChildren()){
Dessert dessert = gigSnapshot.getValue(Dessert.class);
dessertList.add(dessert);
}
DessertAdapter adapter = new DessertAdapter(getContext());
recyclerView.setAdapter(adapter);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
// possible to put progress dialogue
return view;
}
}
I already got the saving to firebase working perfectly and I'm using the MVC model - I created an adapter, a model and wired it to the main activity but my problem is how to use this model into the onAddValueEventChangedListener();
public class DessertAdapter extendsRecyclerView.Adapter<DessertAdapter.DessertVh> {
private List<Dessert> desserts = new ArrayList<>();
private static final int VIEW_TYPE_EMPTY_LIST_PLACEHOLDER = 0;
private static final int VIEW_TYPE_OBJECT_VIEW = 1;
private Context context;
// TODO: placeholder stuff here
#Override
public int getItemViewType(int position) {
if (desserts.isEmpty()) {
return VIEW_TYPE_EMPTY_LIST_PLACEHOLDER;
} else {
return VIEW_TYPE_OBJECT_VIEW;
}
}
public DessertAdapter(Context context) {
this.context = context;
this.desserts = desserts;
desserts = Dessert.prepareDesserts(
context.getResources().getStringArray(R.array.dessert_names),
context.getResources().getStringArray(R.array.dessert_descriptions),
context.getResources().getStringArray(R.array.dessert_amounts));
}
// TODO: another placeholder stuff here
#Override
public DessertVh onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.item_dessert, parent, false);
return new DessertAdapter.DessertVh(view);
}
#Override
public void onBindViewHolder(DessertVh holder, int position) {
Dessert dessert = desserts.get(position);
holder.mName.setText(dessert.getName());
holder.mDescription.setText(dessert.getDescription());
holder.mFirstLetter.setText(String.valueOf(dessert.getFirstLetter()));
holder.mPrice.setText(String.valueOf(dessert.getAmount()));
}
#Override
public int getItemCount() {
// if nothing, return null,
// else return the number of items in the list
return desserts == null ? 0 : desserts.size();
}
public static class DessertVh extends RecyclerView.ViewHolder {
private TextView mName;
private TextView mPrice;
private TextView mDescription;
private TextView mFirstLetter;
public DessertVh(View itemView) {
super(itemView);
mName = (TextView) itemView.findViewById(R.id.txt_name);
mPrice = (TextView) itemView.findViewById(R.id.txt_price);
mDescription = (TextView) itemView.findViewById(R.id.txt_desc);
mFirstLetter = (TextView) itemView.findViewById(R.id.txt_firstletter);
}
}
}
main activity where the tabs are displayed
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabs_header);
// get the gig database
mDatabaseGig = FirebaseDatabase.getInstance().getReference("Gig Posts");
dessertList = new ArrayList<>();
// Configure sign-in to request the user's ID, email address, and basic
// profile. ID and basic profile are included in DEFAULT_SIGN_IN.
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this , this )
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
This handles the display of the data
#Override
public void onStart(){
super.onStart();
mFirebaseAuth.addAuthStateListener(firebaseAuthListener);
// load the data from database here
mDatabaseGig.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
dessertList.clear();
for(DataSnapshot gigSnapshot: dataSnapshot.getChildren()){
Dessert dessert = gigSnapshot.getValue(Dessert.class);
dessertList.add(dessert);
}
// maybe this will work?
DummyFragment dummyFragment = new DummyFragment();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
some code missing here but still part of mainactivity
This is the Dummy Fragment Class inside the main activity
public static class DummyFragment extends Fragment {
int color;
public DummyFragment() {
}
#SuppressLint("ValidFragment")
public DummyFragment(int color) {
this.color = color;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dummy_fragment, container, false);
final FrameLayout frameLayout = (FrameLayout) view.findViewById(R.id.dummyfrag_bg);
frameLayout.setBackgroundColor(color);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.dummyfrag_scrollableview);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setHasFixedSize(true);
// possible to put progress dialogue
DessertAdapter adapter = new DessertAdapter(getContext());
recyclerView.setAdapter(adapter);
return view;
}
}
Put the Firebase code inside the Fragment, not the Activity and also pass the dessertList as a param to the DessertAdapter.
Example:
public static class DummyFragment extends Fragment {
int color;
public DummyFragment() {
}
#SuppressLint("ValidFragment")
public DummyFragment(int color) {
this.color = color;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dummy_fragment, container, false);
final RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.dummyfrag_scrollableview);
final FrameLayout frameLayout = (FrameLayout) view.findViewById(R.id.dummyfrag_bg);
frameLayout.setBackgroundColor(color);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setHasFixedSize(true);
DatabaseReference mDatabaseGig;
final List<Dessert> dessertList;
// get the gig database
mDatabaseGig = FirebaseDatabase.getInstance().getReference("Gig Posts");
dessertList = new ArrayList<>();
DessertAdapter adapter = new DessertAdapter(getContext(), dessertList);
recyclerView.setAdapter(adapter);
mDatabaseGig.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
// dessertList.clear();
for(DataSnapshot gigSnapshot: dataSnapshot.getChildren()){
Dessert dessert = gigSnapshot.getValue(Dessert.class);
dessertList.add(dessert);
adapter.notifyDataSetChanged();
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
// possible to put progress dialogue
return view;
}
}