Develop Reference

Sorting recycler view items according to most recent message

I'm building a chat application using firebase, i want to sort the chat list according to most recent message. The user you sent a message to last should appear at the top. Previous messages should come below, please help!
I've already tried orderbychild("time") it didn't work.
Chats Fragment
public class ChatsFragment extends Fragment {
private View PrivateChatView;
private RecyclerView chatsList;
private RecyclerView chatsLists;
private DatabaseReference ChatsRef,
UsersRef,
RootRef,
MsgRef;
private FirebaseAuth mAuth;
private FirebaseUser mUser;
private String currentUserID;
private String theLastMessage;
public ChatsFragment() { // Required empty public constructor
}
#Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment
PrivateChatView = inflater.inflate(R.layout.fragment_chats, container, false);
mAuth = FirebaseAuth.getInstance();
mUser = FirebaseAuth.getInstance().getCurrentUser();
currentUserID = mAuth.getCurrentUser().getUid();
ChatsRef = FirebaseDatabase.getInstance().getReference().child("Friends").child(currentUserID);
UsersRef = FirebaseDatabase.getInstance().getReference().child("Users");
MsgRef = FirebaseDatabase.getInstance().getReference().child("Messages").child(currentUserID);
RootRef = FirebaseDatabase.getInstance().getReference();
chatsList = (RecyclerView)PrivateChatView.findViewById(R.id.chats_list);
final LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
chatsList.setLayoutManager(layoutManager);
chatsLists = (RecyclerView)PrivateChatView.findViewById(R.id.chats_lists);
chatsLists.setLayoutManager(new LinearLayoutManager(getContext()));
updateToken(FirebaseInstanceId.getInstance().getToken());
return PrivateChatView;
}
private void updateToken(String token) {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Tokens");
Token token1 = new Token(token);
reference.child(currentUserID).setValue(token1);
}
#Override public void onStart() {
super.onStart();
chats();
friends();
}
private void chats() {
FirebaseRecyclerOptions<Friends> options = new FirebaseRecyclerOptions.Builder<Friends>().setQuery(MsgRef.getRef().orderByChild("date"), Friends.class).build();
FirebaseRecyclerAdapter<Friends, ChatsViewHolder> adapter = new FirebaseRecyclerAdapter<Friends, ChatsViewHolder>(options) {
#Override protected void onBindViewHolder(#NonNull final ChatsViewHolder holder, int position, #NonNull final Friends model) {
final String usersID = getRef(position).getKey();
final String[] retImage = {
"default_image"
};
final String list_user_id = getRef(position).getKey();
Query lastMessageQuery = MsgRef.child(list_user_id).limitToLast(1);
lastMessageQuery.addChildEventListener(new ChildEventListener() {
#Override public void onChildAdded(DataSnapshot dataSnapshot, String s) {
String data = dataSnapshot.child("time").getValue().toString();
String data1 = dataSnapshot.child("date").getValue().toString();
holder.userStatus.setText(data + " " + data1);
holder.userStatus.setTypeface(null, Typeface.NORMAL);
}
#Override public void onChildChanged(DataSnapshot dataSnapshot, String s) {}
#Override public void onChildRemoved(DataSnapshot dataSnapshot) {}
#Override public void onChildMoved(DataSnapshot dataSnapshot, String s) {}
#Override public void onCancelled(DatabaseError databaseError) {}
});
UsersRef.child(usersID).addValueEventListener(new ValueEventListener() {
#Override public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.hasChild("image")) {
retImage[0] = dataSnapshot.child("image").getValue().toString();
Picasso.get().load(retImage[0]).placeholder(R.drawable.profile).into(holder.profileImage);
}
final String retName = dataSnapshot.child("name").getValue().toString();
final String retStatus = dataSnapshot.child("status").getValue().toString();
holder.userName.setText(retName);
if (dataSnapshot.child("userState").hasChild("state")) {
String state = dataSnapshot.child("userState").child("state").getValue().toString();
String date = dataSnapshot.child("userState").child("date").getValue().toString();
String time = dataSnapshot.child("userState").child("time").getValue().toString();
}
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent chatIntent = new Intent(getContext(), ChatActivityy.class);
chatIntent.putExtra("visit_user_id", usersID);
chatIntent.putExtra("visit_user_name", retName);
chatIntent.putExtra("visit_image", retImage);
startActivity(chatIntent);
}
});
}
#Override public void onCancelled(#NonNull DatabaseError databaseError) {}
});
}
#NonNull #Override public ChatsViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.user_chat_layout, viewGroup, false);
return new ChatsViewHolder(view);
}
};
chatsList.setAdapter(adapter);
adapter.startListening();
}
private void friends() {
FirebaseRecyclerOptions<Friends> options = new FirebaseRecyclerOptions.Builder<Friends>().setQuery(ChatsRef, Friends.class).build();
FirebaseRecyclerAdapter<Friends, ChatsViewHolder> adapter = new FirebaseRecyclerAdapter<Friends, ChatsViewHolder>(options) {
#Override protected void onBindViewHolder(#NonNull final ChatsViewHolder holder, int position, #NonNull final Friends model) {
final String usersID = getRef(position).getKey();
final String[] retImage = {
"default_image"
};
final String list_user_id = getRef(position).getKey();
UsersRef.child(usersID).addValueEventListener(new ValueEventListener() {
#Override public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.hasChild("image")) {
retImage[0] = dataSnapshot.child("image").getValue().toString();
Picasso.get().load(retImage[0]).placeholder(R.drawable.profile).into(holder.profileImage);
}
final String retName = dataSnapshot.child("name").getValue().toString();
final String retStatus = dataSnapshot.child("status").getValue().toString();
holder.userName.setText(retName);
if (dataSnapshot.child("userState").hasChild("state")) {
String state = dataSnapshot.child("userState").child("state").getValue().toString();
String date = dataSnapshot.child("userState").child("date").getValue().toString();
String time = dataSnapshot.child("userState").child("time").getValue().toString();
}
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent chatIntent = new Intent(getContext(), ChatActivityy.class);
chatIntent.putExtra("visit_user_id", usersID);
chatIntent.putExtra("visit_user_name", retName);
chatIntent.putExtra("visit_image", retImage);
startActivity(chatIntent);
}
});
}
#Override public void onCancelled(#NonNull DatabaseError databaseError) {}
});
}
#NonNull #Override public ChatsViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.user_chat_layout, viewGroup, false);
return new ChatsViewHolder(view);
}
};
chatsLists.setAdapter(adapter);
adapter.startListening();
}
public static class ChatsViewHolder extends RecyclerView.ViewHolder {
CircleImageView profileImage;
TextView userStatus,
userName;
ImageView icon;
public ChatsViewHolder(#NonNull View itemView) {
super(itemView);
profileImage = itemView.findViewById(R.id.users_profile_image);
userStatus = itemView.findViewById(R.id.user_status);
userName = itemView.findViewById(R.id.user_profile_name);
icon = itemView.findViewById(R.id.user_online_status);
}
}
}

Retrieve all data from firebase where users' posts are in uid

I have an android app where users submit their posts and only them can view what they posted. I achieved that using the code below
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
mDatabase = FirebaseDatabase.getInstance().getReference().child("reports").child(uid);
However I have a separate admin app where i want to see what all the users post but i cant be able to achieve that. Please help
below is an image of my database

mDatabase = FirebaseDatabase.getInstance().getReference().child("reports") will get all reports for you.

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference reportsRef = rootRef.child("reports");
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
List<String, Object> list = new ArrayList<>();
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String docId = ds.getKey();
list.add(docId);
Log.d("TAG", docId);
}
Log.d("TAG", list);
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
reportsRef.addListenerForSingleValueEvent(eventListener);

Here is my code
public class MyReports extends Fragment {
private RecyclerView mBlogList;
private GridLayoutManager gridLayoutManager;
private DatabaseReference mDatabase;
private DatabaseReference mDatabaseUsers;
private DatabaseReference mDatabaseLike;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListner;
private boolean mProcessLike = false;
public MyReports() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_my_reports, container, false);
mAuth =FirebaseAuth.getInstance();
mAuthListner = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
if(firebaseAuth.getCurrentUser() == null){
Intent loginIntent = new Intent(getActivity(), Login.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(loginIntent);
}
}
};
mDatabase = FirebaseDatabase.getInstance().getReference().child("reports");
mDatabaseUsers = FirebaseDatabase.getInstance().getReference().child("Users");
mDatabaseLike =FirebaseDatabase.getInstance().getReference().child("Likes");
mDatabase.keepSynced(true);
mDatabaseUsers.keepSynced(true);
mDatabaseLike.keepSynced(true);
mBlogList = (RecyclerView) view.findViewById(R.id.blog_list);
mBlogList.setHasFixedSize(true);
mBlogList.setLayoutManager(new LinearLayoutManager(getContext()));
return view;
}
#Override
public void onStart() {
super.onStart();
FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
Blog.class,
R.layout.post_row,
MyReports.BlogViewHolder.class,
mDatabase
) {
#Override
protected void populateViewHolder(MyReports.BlogViewHolder viewHolder, Blog model, final int position) {
final String post_key =getRef(position).getKey();
viewHolder.setOutreach(model.getOutreach());
viewHolder.setDate(model.getDate());
viewHolder.setNamee(model.getNamee());
viewHolder.setPhone(model.getPhone());
viewHolder.setPartici(model.getPartici());
viewHolder.setLesson(model.getLesson());
viewHolder.setImage(getActivity().getApplicationContext(),model.getImage());
viewHolder.setImage1(getActivity().getApplicationContext(),model.getImage1());
viewHolder.setImage2(getActivity().getApplicationContext(),model.getImage2());
viewHolder.setImage3(getActivity().getApplicationContext(),model.getImage3());
viewHolder.setImage4(getActivity().getApplicationContext(),model.getImage4());
viewHolder.setLikeBtn(post_key);
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Toast.makeText(getActivity(), post_key, Toast.LENGTH_SHORT).show();
Intent singleBlogIntent = new Intent(getActivity(), PostSingleActivity.class);
singleBlogIntent.putExtra("blog_id", post_key);
startActivity(singleBlogIntent);
}
});
viewHolder.mLikebtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mProcessLike = true;
if(mProcessLike){
mDatabaseLike.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())){
}else {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).setValue("RandomValue");
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
});
}
};
mBlogList.setAdapter(firebaseRecyclerAdapter);
}
public static class BlogViewHolder extends RecyclerView.ViewHolder{
View mView;
ImageButton mLikebtn;
DatabaseReference mDatabaseLike;
FirebaseAuth mAuth;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
mLikebtn = (ImageButton) mView.findViewById(R.id.like_btn);
mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
mAuth = FirebaseAuth.getInstance();
mDatabaseLike.keepSynced(true);
}
public void setLikeBtn(final String post_key){
mDatabaseLike.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())){
mLikebtn.setImageResource(R.drawable.ic_new_like_blue);
}else {
mLikebtn.setImageResource(R.drawable.ic_new_like_red2);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void setOutreach(String title){
TextView post_title = (TextView) mView.findViewById(R.id.post_outreach);
post_title.setText(title);
}
public void setDate(String desc){
TextView post_desc = (TextView) mView.findViewById(R.id.post_date);
post_desc.setText(desc);
}
public void setNamee(String username){
TextView post_username = (TextView) mView.findViewById(R.id.post_namee);
post_username.setText(username);
}
public void setPhone(String date){
TextView post_date = (TextView) mView.findViewById(R.id.post_phone);
post_date.setText(date);
}
public void setPartici(String phone){
TextView post_phone = (TextView) mView.findViewById(R.id.post_partici);
post_phone.setText(phone);
}
public void setLesson(String date){
TextView post_date = (TextView) mView.findViewById(R.id.post_lesson);
post_date.setText(date);
}
public void setImage(Context ctx, String image){
ImageView post_image = (ImageView) mView.findViewById(R.id.post_image);
Picasso.with(ctx).load(image).into(post_image);
}
public void setImage1(Context ctx, String image1){
ImageView post_image1 = (ImageView) mView.findViewById(R.id.post_image1);
Picasso.with(ctx).load(image1).into(post_image1);
}
public void setImage2(Context ctx, String image2){
ImageView post_image2 = (ImageView) mView.findViewById(R.id.post_image2);
Picasso.with(ctx).load(image2).into(post_image2);
}
public void setImage3(Context ctx, String image3){
ImageView post_image3 = (ImageView) mView.findViewById(R.id.post_image3);
Picasso.with(ctx).load(image3).into(post_image3);
}
public void setImage4(Context ctx, String image4){
ImageView post_image4 = (ImageView) mView.findViewById(R.id.post_image4);
Picasso.with(ctx).load(image4).into(post_image4);
}
}
public void onResume(){
super.onResume();
// Set title bar
((MainActivity) getActivity())
.setActionBarTitle("Reports");
}
}

Firebase syncing method not syncing

Code
public class HomeScreen_Friends extends Fragment {
private View rootView;
private String userName;
private String UID;
private TextView noUsersText;
private ProgressDialog mProgressDialogue;
private FirebaseAuth mAuth;
private FirebaseUser currentUser;
private DatabaseReference mDatabaseReference;
private DatabaseReference mUsersDatabase;
private RecyclerView mUsersList;
private FirebaseRecyclerAdapter<AllUsersHelper, UsersViewHolder> firebaseRecyclerAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_friends, container, false);
noUsersText = (TextView) rootView.findViewById(R.id.noUsersText);
mUsersList = (RecyclerView) rootView.findViewById(R.id.usersList);
mUsersList.addItemDecoration(new DividerItemDecoration(getContext(),
DividerItemDecoration.HORIZONTAL));
mAuth = FirebaseAuth.getInstance();
currentUser = mAuth.getCurrentUser();
UID = mAuth.getCurrentUser().getUid();
mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Friends").child(UID);
mDatabaseReference.keepSynced(true);
mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("UserData");
mUsersDatabase.keepSynced(true);
mProgressDialogue = new ProgressDialog(getActivity());
mProgressDialogue.setMessage("Loading...");
mProgressDialogue.show();
mUsersList.setLayoutManager(new LinearLayoutManager(getActivity()));
FirebaseRecyclerOptions<AllUsersHelper> options =
new FirebaseRecyclerOptions.Builder<AllUsersHelper>()
.setQuery(mDatabaseReference, AllUsersHelper.class)
.build();
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<AllUsersHelper, UsersViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull final UsersViewHolder holder, int position, #NonNull AllUsersHelper model) {
holder.setName(model.getName());
holder.setStatus(model.getStatus());
holder.setImage(model.getImage());
final String userId = getRef(position).getKey();
mUsersDatabase.orderByChild("Name");
mUsersDatabase.child(userId).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String mName = dataSnapshot.child("Name").getValue().toString();
String mStatus = dataSnapshot.child("Status").getValue().toString();
String mDisplayImage = dataSnapshot.child("Image").getValue().toString();
if(dataSnapshot.hasChild("Online")) {
String userOnline = dataSnapshot.child("Online").getValue().toString();
holder.setUserOnline(userOnline);
}
holder.setName(mName);
holder.setImage(mDisplayImage);
holder.setStatus(mStatus);
mProgressDialogue.dismiss();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
holder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference().child("UserData").child(userId);
rootRef.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
userName = dataSnapshot.child("Name").getValue().toString();
Intent intent = new Intent(getActivity(), Chat.class);
intent.putExtra("Recievers_Id", userId);
intent.putExtra("Recievers_Name", userName);
startActivity(intent);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}
#Override
public UsersViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.custom_activity_all_users, parent, false);
return new UsersViewHolder(view);
}
};
mUsersList.setAdapter(firebaseRecyclerAdapter);
return rootView;
}
public static class UsersViewHolder extends RecyclerView.ViewHolder {
public View mView;
public UsersViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setName(String name) {
TextView mDisplayName = (TextView) mView.findViewById(R.id.display_name);
mDisplayName.setText(name);
}
public void setStatus(String status) {
TextView mDisplayStatus = (TextView) mView.findViewById(R.id.display_status);
mDisplayStatus.setText(status);
}
public void setImage(String image) {
CircularImageView mDisplayImage = (CircularImageView) mView.findViewById(R.id.circleImageView);
Picasso.get().load(image).into(mDisplayImage);
}
public void setUserOnline(String userOnline) {
ImageView userOnlineView = (ImageView) mView.findViewById(R.id.online);
if(userOnline.equals("Online")){
userOnlineView.setVisibility(View.VISIBLE);
} else {
userOnlineView.setVisibility(View.INVISIBLE);
}
}
}
#Override
public void onStart() {
super.onStart();
firebaseRecyclerAdapter.startListening();
}
#Override
public void onStop() {
super.onStop();
if(firebaseRecyclerAdapter != null) {
firebaseRecyclerAdapter.stopListening();
}
}
}
Where should i put the keepSynced method for retrieving data offline because i tried below the database reference and it still doesn't show my data when i have no internet. Can someone help me out please... Also if the resukt is null how can i stop the progress dialog and show a text which says there are no users.

Right now you're just telling Firebase to keep an empty listener active on your Friends and UserData nodes. This ensures that the data from these nodes is always kept up to date (even when you don't attach any other listeners), but the data is still only kept in memory.
To persist the memory cache to disk, so that it can be reloaded in case you don't have an internet connection when starting the app, you'll need to call FirebaseDatabase.getInstance().setPersistenceEnabled(true) when the app starts. See enabling disk persistence in the Firebase docs.
Also see:
Firebase : What is the difference between setPersistenceEnabled and keepSynced?

How to hide particular item in RecyclerView and deleting its space

I want to hide the current user in RequestsFragment in recyclerview. I tried to setVisibility feature. The current user's informantions are not seen to him. But there is a space still in recyclerview. How can i also delete space between other items. I mean if I have sent a request to other users I dont want to see myself at requests fragment.
public class RequestsFragment extends Fragment {
private RecyclerView recyclerView_friendRequestsList;
private View mainView;
private DatabaseReference friendRequestsDatabaseReference;
private DatabaseReference usersDatabaseReference;
private FirebaseAuth firebaseAuth;
private String current_user_id;
public RequestsFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
mainView = inflater.inflate(R.layout.fragment_requests, container, false);
recyclerView_friendRequestsList = mainView.findViewById(R.id.friendRequests_list);
recyclerView_friendRequestsList.setHasFixedSize(true);
recyclerView_friendRequestsList.setLayoutManager(new LinearLayoutManager(getContext()));
firebaseAuth = FirebaseAuth.getInstance();
current_user_id = firebaseAuth.getCurrentUser().getUid();
friendRequestsDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Friend Requests");
friendRequestsDatabaseReference.keepSynced(true);
usersDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users");
usersDatabaseReference.keepSynced(true);
return mainView;
}
#Override
public void onStart() {
super.onStart();
final FirebaseRecyclerAdapter<FriendRequests, RequestsFragment.FriendRequestsViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<FriendRequests, FriendRequestsViewHolder>(
FriendRequests.class,
R.layout.users_single_layout,
RequestsFragment.FriendRequestsViewHolder.class,
friendRequestsDatabaseReference
) {
#Override
protected void populateViewHolder(final FriendRequestsViewHolder viewHolder, FriendRequests model, final int position) {
final String user_id = getRef(position).getKey();
friendRequestsDatabaseReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.hasChild(user_id)){
usersDatabaseReference.child(user_id).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!user_id.equals(current_user_id)) {
final String user_displayName = dataSnapshot.child("display_name").getValue().toString();
final String user_thumbImage = dataSnapshot.child("thumb_image").getValue().toString();
if (dataSnapshot.hasChild("online")) {
String userOnline = dataSnapshot.child("online").getValue().toString();
viewHolder.setUserOnline(userOnline);
}
viewHolder.setName(user_displayName);
viewHolder.setImage(user_thumbImage);
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent profileIntent = new Intent(getContext(), ProfileActivity.class);
profileIntent.putExtra("user_id", user_id);
startActivity(profileIntent);
}
});
} else {
viewHolder.mView.setVisibility(View.GONE);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
friendRequestsDatabaseReference.child(current_user_id).child(user_id).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.hasChild("request_type")) {
String request_type = dataSnapshot.child("request_type").getValue().toString();
viewHolder.setRequest_type(request_type);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
};
recyclerView_friendRequestsList.setAdapter(firebaseRecyclerAdapter);
}
public static class FriendRequestsViewHolder extends RecyclerView.ViewHolder {
View mView;
public FriendRequestsViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setName(String name) {
TextView userNameView = mView.findViewById(R.id.user_single_displayName);
userNameView.setText(name);
}
public void setRequest_type(String request_type) {
TextView userStatusView = mView.findViewById(R.id.user_single_status);
userStatusView.setText(request_type);
}
public void setImage(final String thumb_image) {
CircleImageView userImageView = mView.findViewById(R.id.user_single_image);
Picasso.get().load(thumb_image).placeholder(R.mipmap.default_avatar).into(userImageView);
}
public void setUserOnline(String online_status) {
ImageView userOnlineView = mView.findViewById(R.id.user_single_online);
if (online_status.equals("true")) {
userOnlineView.setVisibility(View.VISIBLE);
} else {
userOnlineView.setVisibility(View.INVISIBLE);
}
}
}
}

Cannot receive Strings from Android Firebase Database

I want to get the name (String) and the location (String) from my firebase database into a listview of a fragment page of my app. It doesnt give any errors but the name and location text just dont appear on the app. thanks for help. I think there is a problem to get the strings from the firebase server.
Firebase hierarchy : FIREBASE -> Events -> XmasParty -> location = Germany
-> name = XmasParty
FRAGMENT :
public class RequestsFragment extends Fragment {
private Button create_event_btn;
private View mMainView2;
private RecyclerView mEventList;
private DatabaseReference mEventsDatabase;
private LinearLayoutManager mLayoutManager;
public void ChatsFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mMainView2 = inflater.inflate(R.layout.fragment_requests, container, false);
mEventsDatabase = FirebaseDatabase.getInstance().getReference().child("Events");
mLayoutManager = new LinearLayoutManager(getContext());
create_event_btn = (Button) mMainView2.findViewById(R.id.create_btn);
mEventList = (RecyclerView) mMainView2.findViewById(R.id.event_list);
mEventList.setHasFixedSize(true);
mEventList.setLayoutManager(mLayoutManager);
create_event_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), Create_EventActivity.class);
startActivity(intent);
}
});
// Inflate the layout for this fragment
return mMainView2;
}
#Override
public void onStart() {
super.onStart();
FirebaseRecyclerAdapter<Events, RequestsFragment.EventsViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Events, EventsViewHolder>(
Events.class,
R.layout.users_single_layout,
RequestsFragment.EventsViewHolder.class,
mEventsDatabase
) {
#Override
protected void populateViewHolder(RequestsFragment.EventsViewHolder eventsViewHolder, Events events, int position) {
eventsViewHolder.setDisplayName(events.getName());
eventsViewHolder.setUserStatus(events.getLocation());
// usersViewHolder.setUserImage(users.getThumb_image(), getApplicationContext());
final String event_id = getRef(position).getKey();
eventsViewHolder.mView2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Intent profileIntent = new Intent(UsersActivity.this, ProfileActivity.class);
// profileIntent.putExtra("user_id", user_id);
// startActivity(profileIntent);
}
});
}
};
mEventList.setAdapter(firebaseRecyclerAdapter);
}
public static class EventsViewHolder extends RecyclerView.ViewHolder {
View mView2;
public EventsViewHolder(View itemView2) {
super(itemView2);
mView2 = itemView2;
}
public void setDisplayName(String name){
TextView userNameView = (TextView) mView2.findViewById(R.id.user_single_name);
userNameView.setText(name);
}
public void setUserStatus(String status){
TextView userStatusView = (TextView) mView2.findViewById(R.id.user_single_status);
userStatusView.setText(status);
}
}
}
}
EVENTS CLASS
public class Events {
public String name;
public String location;
public String time;
public Events(){
}
public Events(String name, String location, String time) {
this.name = name;
this.location = location;
this.time = time;
}
public String getName() {return name;}
public void setName(String name) {
this.name = name;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getTime() {return time;}
public void setTime(String time) {this.time = time;}
}

To get the value of location and name, please use the following code:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference yourRef = rootRef.child("Events").child("XmasParty");
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String location = dataSnapshot.child("location").getValue(String.class);
String name = dataSnapshot.child("name").getValue(String.class);
Log.d("TAG", location + " / " + name);
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
yourRef.addListenerForSingleValueEvent(eventListener);
The output will be:
Germany / XmasParty