Develop Reference

Empty Space in Recycler View using Firebase Adapter with View.GONE

So basically I have implemented a fragment for my app using firebase Recycler Adapter. I have searched through out the internet to hide a row in the recycler view without occupying white space. I have applied various people solutions but result is same.
My Fragment code is like this:
public class RequestFragment extends Fragment {
...
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
mMainView = inflater.inflate(R.layout.fragment_request, container, false);
mReqList = (RecyclerView) mMainView.findViewById(R.id.req_list);
mRootRef =FirebaseDatabase.getInstance().getReference();
mAuth = FirebaseAuth.getInstance();
if(mAuth.getCurrentUser() !=null)
mCurrent_user_id = mAuth.getCurrentUser().getUid();
if(mCurrent_user_id !=null) {
mReqDatabase = FirebaseDatabase.getInstance().getReference().child("Friend_req").child(mCurrent_user_id);
mReqDatabase.keepSynced(true);
}
text = (TextView) mMainView.findViewById(R.id.request_fragment_text);
mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("Users");
mUsersDatabase.keepSynced(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
mReqList.setHasFixedSize(true);
mReqList.setLayoutManager(linearLayoutManager);
// Inflate the layout for this fragment
return mMainView;
}
#Override
public void onStart() {
super.onStart();
if(mReqDatabase != null) {
final Query requestQuery = mReqDatabase.orderByChild("request_type");
FirebaseRecyclerAdapter<Request, RequestFragment.ReqViewHolder> firebaseReqAdapter = new FirebaseRecyclerAdapter<Request, RequestFragment.ReqViewHolder>(
Request.class,
R.layout.single_request_layout,
ReqViewHolder.class,
requestQuery
) {
#Override
protected void onDataChanged() {
if(getItemCount() == 0){
text.setText("No New Friend Request");
}
else{
text.setText("");
}
}
#Override
protected void populateViewHolder(final RequestFragment.ReqViewHolder reqViewHolder, final Request req, int i) {
final String list_user_id = getRef(i).getKey();
mAcceptBtn = reqViewHolder.mView.findViewById(R.id.single_req_accept_btn2);
mDeclineBtn = reqViewHolder.mView.findViewById(R.id.single_req_decline_btn);
if (req.getRequest_type().equals("received")) {
mUsersDatabase.child(list_user_id).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
text.setText("");
final String userName = dataSnapshot.child("name").getValue().toString();
String userThumb = dataSnapshot.child("thumb_image").getValue().toString();
if (dataSnapshot.hasChild("online")) {
String userOnline = dataSnapshot.child("online").getValue().toString();
reqViewHolder.setUserOnline(userOnline);
}
reqViewHolder.setName(userName);
reqViewHolder.setUserImage(userThumb, getContext());
mAcceptBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final String currentDate = DateFormat.getDateTimeInstance().format(new Date());
Map friendsMap = new HashMap();
friendsMap.put("Friends/" + mCurrent_user_id + "/" + list_user_id + "/date", currentDate);
friendsMap.put("Friends/" + list_user_id + "/" + mCurrent_user_id + "/date", currentDate);
friendsMap.put("Friend_req/" + mCurrent_user_id + "/" + list_user_id, null);
friendsMap.put("Friend_req/" + list_user_id + "/" + mCurrent_user_id, null);
mRootRef.updateChildren(friendsMap, new DatabaseReference.CompletionListener() {
#Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError == null) {
reqViewHolder.mView.setVisibility(View.INVISIBLE);
} else {
String error = databaseError.getMessage();
Toast.makeText(getActivity(), error, Toast.LENGTH_SHORT).show();
}
}
});
}
});
mDeclineBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final String currentDate = DateFormat.getDateTimeInstance().format(new Date());
Map friendsMap = new HashMap();
friendsMap.put("Friend_req/" + mCurrent_user_id + "/" + list_user_id, null);
friendsMap.put("Friend_req/" + list_user_id + "/" + mCurrent_user_id, null);
mRootRef.updateChildren(friendsMap, new DatabaseReference.CompletionListener() {
#Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError == null) {
reqViewHolder.mView.setVisibility(View.INVISIBLE);
} else {
String error = databaseError.getMessage();
Toast.makeText(getActivity(), error, Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
} else {
reqViewHolder.Invisible();
text.setText("No New Friend Request");
}
}
};
mReqList.setAdapter(firebaseReqAdapter);
}
}
public static class ReqViewHolder extends RecyclerView.ViewHolder {
View mView;
public ReqViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setStatus(String status) {
TextView fragmentStatus = mView.findViewById(R.id.request_fragment_text);
fragmentStatus.setText(status);
}
public void setName(String name){
TextView userNameView = (TextView) mView.findViewById(R.id.req_single_name);
userNameView.setText(name);
}
public void setUserImage(String thumb_image, Context ctx){
CircleImageView userImageView = (CircleImageView) mView.findViewById(R.id.req_single_image);
Picasso.get().load(thumb_image).placeholder(R.drawable.default_avatar).into(userImageView);
}
public void setUserOnline(String online_status) {
ImageView userOnlineView = (ImageView) mView.findViewById(R.id.req_single_online_icon);
if(online_status.equals("true")){
userOnlineView.setVisibility(View.VISIBLE);
} else {
userOnlineView.setVisibility(View.INVISIBLE);
}
}
public void Invisible(){
mView.setVisibility(View.INVISIBLE);
}
}
}
My fragment in the app is looking like this:
Can anyone help me how to get rid of this white space?

Unable to display all images from firebase database and I want to show all images from one id into grid view

This is my firebase storage image and I want to display all images from url into gridview by taking the current user id
This is my main activity onstart() that leads to adapter class.
I want to show all the images under current user id like grid view.
How to display all user image posts in grid view from firebase above image.
#Override
protected void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
uploads = new ArrayList<Blog>();
if (currentUser != null && !currentUser.isAnonymous()) {
mUserf.child("online").setValue("true");
mProgressbar.setMessage("Welcome.....");
mProgressbar.show();
mProgressbar.dismiss();
ConnectivityManager check = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info = check.getActiveNetworkInfo(); //for checking whether app is connected to a network or not..
if(info!=null && info.isConnected()) {
//Toast.makeText(MainActivity.this, "network available", Toast.LENGTH_SHORT).show();
firebaseAuth.addAuthStateListener(authStateListener);
mProgressbar.setMessage("Fetching Blogs.....");
mProgressbar.show();
mProgressbar.dismiss();
list = new ArrayList<>();
adapter = new MyCustomAdapter(this,list,firebaseAuth,mdatabaseReference,likesdatabaseReference);
recyclerView = (RecyclerView) findViewById(R.id.blog_list);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
alpha = FirebaseDatabase.getInstance().getReference().child("Blog").child(mAuth.getCurrentUser().getUid());
mchildEventListener = new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
mProgressbar.dismiss();
String j = dataSnapshot.getKey();
Log.v("GETKEYZZZ", j);
Blog friendlyMessage = dataSnapshot.getValue(Blog.class);
friendlyMessage.setPostkey(j);
list.add(friendlyMessage);
adapter.notifyDataSetChanged();
}
public void onChildChanged(DataSnapshot dataSnapshot, String s) {}
public void onChildRemoved(DataSnapshot dataSnapshot){}
public void onChildMoved(DataSnapshot dataSnapshot, String s) {}
public void onCancelled(DatabaseError databaseError) {}
};
mquery.addChildEventListener(mchildEventListener);
} else {
//Toast.makeText(MainActivity.this, "No network available", Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(),"Please Check Your Internet Connection", Toast.LENGTH_LONG).show();
}
// mDatabseUsers.child("online").setValue("true");
} else {
Intent user1 = new Intent(MainActivity.this, LoginActivity.class);
startActivity(user1);
}
}
This is my adapter class where
public class MyCustomAdapter extends RecyclerView.Adapter<MyCustomAdapter.myviewholder> {
Context context;
ArrayList<Blog> list;
List <String> imageUrls;
//List<String> imageUrls ;
LayoutInflater inflator;
int lastPosition = 1;
boolean mprogressLike = true,mprogressview = true;
DatabaseReference likeDatabaseReference;
FirebaseAuth firebaseAuth;
DatabaseReference blogDatabaseReference;
public MyCustomAdapter(Context context, ArrayList<Blog> list,FirebaseAuth firebaseAuth,DatabaseReference blogDatabaseReference, DatabaseReference likeDatabaseReference) {
this.context=context;
this.list=list;
inflator=LayoutInflater.from(context);
this.likeDatabaseReference=likeDatabaseReference;
this.firebaseAuth=firebaseAuth;
this.blogDatabaseReference=blogDatabaseReference;
}
#Override
public myviewholder onCreateViewHolder(ViewGroup parent, int position) {
View v=inflator.inflate(R.layout.posts,parent,false);//this view will contain appearance of each layout i.e each row..
myviewholder holder=new myviewholder(v);// we are passing the view of each row to the myviewholder class
return holder;
}
#Override
public void onBindViewHolder(final myviewholder holder, int position) {//here we will inflate datas in the widgets i.e image and title..
//It is called for each row..so every row is inflated here..
final Blog p=list.get(position);
holder.title.setText(p.getTitle());
holder.username.setText(p.getUsername());
holder.viewno.setText(p.getTimestamp());
/*int count = 0;
for(HospitalModel.Images images: hospitalModelList.get(position).getImagesList()) {
count += images.size();
}*/
for(Blog model : list) {
imageUrls = new ArrayList<>();;
imageUrls.addAll(model.getUrl());
Log.v("IMURLSSS", String.valueOf(imageUrls));
Picasso.with(context).load(imageUrls.get(position)).into(holder.imageview);
Log.v("IMGGPOS", imageUrls.get(position));
}
Picasso.with(context).load(p.getImage()).into(holder.userdp);
}
#Override
public int getItemCount() {
return list.size();
}
public class myviewholder extends RecyclerView.ViewHolder implements View.OnClickListener {
// It contains the elements in each row that we will inflate in the recyclerView..
TextView title,desc,username,likeno,viewno;
ImageView imageview,userdp, over, comments, likes;
ImageButton likebtn,viewbtn;
public myviewholder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.blog_desc);//here we link with the elements of each view i.e each row and
// desc = (TextView) itemView.findViewById(R.id.postdesc);//here we link with the elements of each view i.e each row and
username = (TextView) itemView.findViewById(R.id.blog_user_name);
viewno = (TextView) itemView.findViewById(R.id.blog_date);
likeno = (TextView) itemView.findViewById(R.id.blog_like_count);
userdp = (ImageView) itemView.findViewById(R.id.blog_user_image);
imageview = (ImageView) itemView.findViewById(R.id.blog_image);
comments = (ImageView) itemView.findViewById(R.id.blog_comment_icon);
//here we link with the elements of each view i.e each row and
// likebtn = (ImageButton)itemView.findViewById(R.id.likebtn);
// viewbtn = (ImageButton)itemView.findViewById(R.id.viewbtn);
comments.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mprogressview = true;
int pos = getAdapterPosition();
Blog b = list.get(pos);
Intent intent = new Intent(context,CommentBox.class);
Bundle bundle = new Bundle();
bundle.putString("post_key",b.getUid().toString());
intent.putExtras(bundle);
context.startActivity(intent);
}
});
over = (ImageView) itemView.findViewById(R.id.overflow);
over.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showFilterPopup(v);
}
});
});
itemView.setOnClickListener(this);
}
}

To display all those url's, please use the following lines of code:
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference urlRef = rootRef.child("Blog").child(uid).child("url");
ValueEventListener valueEventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String url = ds.getValue(String.class);
Log.d("TAG", url);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
urlRef.addListenerForSingleValueEvent(valueEventListener);
And here is a recommended way in which you can retrieve data from a Firebase Realtime database and display it in a RecyclerView using FirebaseRecyclerAdapter.
Edit:
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference uidRef = rootRef.child("Blog").child(uid);
ValueEventListener valueEventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String uid = dataSnapshot.child("uid").getValue(String.class);
String title = dataSnapshot.child("title").getValue(String.class);
String timestamp = dataSnapshot.child("timestamp").getValue(String.class);
Log.d("TAG", uid + " / " + title + " / " + timestamp);
for(DataSnapshot ds : dataSnapshot.child("url").getChildren()) {
String url = ds.getValue(String.class);
Log.d("TAG", url);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
uidRef.addListenerForSingleValueEvent(valueEventListener);

RecyclerView shuffling items images

I'm new to android and I wanted to create a chat in my app, it's like a global roomchat based on firebase. Messages are displayed via RecyclerView and the problem is that when it's loaded the images of people, their names are somehow mixed up. When I go back to previous activity and open the chat activity again everything becomes OK. But the when a new message is added the rows shuffle again. I'm sure that it should be very ease to fix, but I can't...Please help. Thank you!
This is the chat activity oncreate:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_chat);
main_recycler_view = (RecyclerView) findViewById(R.id.messages_list);
main_recycler_view.setVisibility(View.GONE);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setVisibility(View.VISIBLE);
mAuth = FirebaseAuth.getInstance();
if (mAuth.getCurrentUser() != null) {
mUserRef = FirebaseDatabase.getInstance().getReference().child("Users").child(mAuth.getCurrentUser().getUid());
}
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser == null) {
sendToStart();
} else {
mUserRef.child("online").setValue("true");
String transp = "https://firebasestorage.googleapis.com/v0/b/chatqs-a4c10.appspot.com/o/profile_images%2Ftransp.png?alt=media&token=fc7b2315-f24b-453a-926e-364fff55e31b";
mUserRef.child("version").setValue(transp);
mToolbar = (Toolbar) findViewById(R.id.chattb);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle(R.string.chat_title);
imageButton_send = (Button) findViewById(R.id.chat_send_btn);
editText_message = (EditText) findViewById(R.id.chat_message_view);
database = FirebaseDatabase.getInstance();
databaseRef = database.getReference();
mContext = (MainChatPage.this);
adapter = new MainAdapter(mContext, messageArrayList);
main_recycler_view.setAdapter(adapter);
main_recycler_view.setLayoutManager(new LinearLayoutManager(c));
databaseRef.child("the_messages").limitToLast(50).addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
progressBar.setVisibility(View.GONE);
main_recycler_view.setVisibility(View.VISIBLE);
final Message new_message = dataSnapshot.getValue(Message.class);
final String userid = dataSnapshot.child("userID").getValue().toString();
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
final String current_uid = mCurrentUser.getUid();
mDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(current_uid).child("blocked");
mDatabase.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.child(userid).exists()) {
messageArrayList.remove(new_message);
}
adapter.notifyDataSetChanged();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
main_recycler_view.scrollToPosition(adapter.getItemCount() - 1);
messageArrayList.add(new_message);
adapter.notifyDataSetChanged();
}
#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) {
}
});
My adapter:
public MainAdapter(MainChatPage context, ArrayList<Message> data) {
this.data = data;
this.mContext = context;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.message_single_layout, null);
message_profile_layout = (CircleImageView) view.findViewById(R.id.message_profile_layout);
MyViewHolder viewHolder = new MyViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(final MyViewHolder myViewHolder, final int i) {
final Message message = data.get(i);
final String userid = message.getUserID();
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
final String current_uid = mCurrentUser.getUid();
mDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(current_uid).child("blocked");
mDatabase.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
mUserDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(userid);
mUserDatabase.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String thumb = dataSnapshot.child("thumb_image").getValue().toString();
String nome = dataSnapshot.child("name").getValue().toString();
String dialog_name = nome;
String vers = dataSnapshot.child("version").getValue().toString();
//String proic = "https://firebasestorage.googleapis.com/v0/b/chatqs-a4c10.appspot.com/o/profile_images%2Ficonfinder-pro-icon-icon.png?alt=media&token=1ca05e32-f3e7-4f73-af54-2be17ad0fed6";
// Picasso.with(myViewHolder.mes_proicon.getContext()).load(proic)
// .placeholder(R.drawable.transp).into(myViewHolder.mes_proicon);
// myViewHolder.name_text_layout.setText(nome);
Picasso.with(myViewHolder.message_profile_layout.getContext()).load(thumb)
.placeholder(R.drawable.default_avatar).into(myViewHolder.message_profile_layout);
Picasso.with(myViewHolder.mes_proicon.getContext()).load(vers)
.placeholder(R.drawable.transp).into(myViewHolder.mes_proicon);
myViewHolder.name_text_layout.setText(nome);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
String formatted_date = SCUtils.formatted_date(message.getTimestamp());
myViewHolder.message_text_layout.setText(Html.fromHtml(message.getMessage()));
myViewHolder.time_text_layout.setText(Html.fromHtml(formatted_date));
myViewHolder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (!userid.equals(current_uid)) {
final AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
LayoutInflater inflater = mContext.getLayoutInflater();
View dialogView = inflater.inflate(R.layout.dialog, null);
TextView dialog_name = (TextView) dialogView.findViewById(R.id.dialog_name);
CircleImageView dialog_icon = (CircleImageView) dialogView.findViewById(R.id.dialog_icon);
builder.setView(dialogView);
dialog_name.setText(myViewHolder.name_text_layout.getText());
dialog_icon.setImageDrawable(myViewHolder.message_profile_layout.getDrawable());
builder.setPositiveButton(R.string.block, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int id) {
mDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(current_uid).child("blocked");
mDatabase.child(userid).push().setValue("");
}
})
.setNegativeButton(R.string.open_profile, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent chatIntent = new Intent(mContext, UserProfileActivity.class);
chatIntent.putExtra("user_id", userid);
mContext.startActivity(chatIntent);
mContext.finish();
}
});
builder.show();
} else {
Intent Intent = new Intent(mContext, ProfileFragment.class);
mContext.startActivity(Intent);
mContext.finish();
}
}
});
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
#Override
public int getItemCount() {
return data.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
View mView;
protected TextView message_text_layout;
protected TextView name_text_layout;
protected TextView time_text_layout;
protected CircleImageView message_profile_layout;
protected CircleImageView mes_proicon;
public MyViewHolder(View itemView) {
super(itemView);
mView = itemView;
this.message_text_layout = (TextView) mView.findViewById(R.id.message_text_layout);
this.name_text_layout = (TextView) mView.findViewById(R.id.name_text_layout);
this.time_text_layout = (TextView) mView.findViewById(R.id.time_text_layout);
this.mes_proicon = (CircleImageView) mView.findViewById(R.id.mes_proicon);
this.message_profile_layout = (CircleImageView) mView.findViewById(R.id.message_profile_layout);
}
}

just remove .placeholder. I dont know why but sometimes it happens because of this method

RecyclerView Adapter notify data changed

There is my activity:
public class EventDetailsActivity extends AppCompatActivity {
private Event event;
private ArrayList<User> subscribedUsers;
private RecyclerView mRecyclerView;
private String eventId;
private SubscribedUsersAdapter adapter;
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_event_details);
context = this;
Bundle extras = getIntent().getExtras();
eventId = extras.getString("eventId");
setUpEvent();
}
private void setUpEvent() {
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
final DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference().child("events").child(eventId);
mDatabase.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String eventType = dataSnapshot.child("eventType").getValue().toString();
String description = dataSnapshot.child("description").getValue().toString();
Object object = dataSnapshot.child("startingDate").getValue();
HashMap result = (HashMap) object;
int year = Integer.parseInt(result.get("year").toString());
int month = Integer.parseInt(result.get("month").toString());
int day = Integer.parseInt(result.get("date").toString());
int hour = Integer.parseInt(result.get("hours").toString());
int minute = Integer.parseInt(result.get("minutes").toString());
Date startingDate = new Date(year,month,day,hour,minute,0);
object = dataSnapshot.child("location").getValue();
result = (HashMap) object;
double latitude = Double.parseDouble(result.get("latitude").toString());
double longitude = Double.parseDouble(result.get("longitude").toString());
LatLng location = new LatLng(latitude,longitude);
String userId = dataSnapshot.child("userId").getValue().toString();
String userName = dataSnapshot.child("userName").getValue().toString();
String userPicture = dataSnapshot.child("userPicture").getValue().toString();
subscribedUsers = new ArrayList<User>();
if (dataSnapshot.hasChild("subscribedUsers")) {
mDatabase.child("subscribedUsers").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot childSnapshot : dataSnapshot.getChildren()) {
String userId = childSnapshot.child("userId").getValue().toString();
String name = childSnapshot.child("name").getValue().toString();
String picture = childSnapshot.child("picture").getValue().toString();
User subscribedUser = new User(userId, name, picture);
if (containsUser(subscribedUsers, subscribedUser) == -1) {
subscribedUsers.add(subscribedUser);
}
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
event = new Event(eventId, eventType,description,startingDate,location,userId, userName, userPicture);
setText();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void setText()
{
ImageView mProfilePicture = (ImageView) findViewById(R.id.profilePicture);
if (!EventDetailsActivity.this.isFinishing()) {
Glide
.with(this)
.load(event.getUserPicture())
.into(mProfilePicture);
}
TextView mUserName = (TextView) findViewById(R.id.userName);
mUserName.setText(event.getUserName());
TextView mEventType = (TextView) findViewById(R.id.eventType);
mEventType.setText(event.getEventType());
TextView mDescription = (TextView) findViewById(R.id.description);
mDescription.setText(event.getDescription());
if (!EventDetailsActivity.this.isFinishing()) {
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.mapView);
mapFragment.getMapAsync(new OnMapReadyCallback()
{
#Override
public void onMapReady(GoogleMap googleMap) {
googleMap.clear();
googleMap.addMarker(new MarkerOptions().position(event.getLocation()));
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(event.getLocation(),12.0f));
}
});
}
TextView mStartingDate = (TextView) findViewById(R.id.startingDate);
Date startingDate = event.getStartingDate();
String displayText = String.valueOf(startingDate.getYear());
int month = startingDate.getMonth() + 1;
if (month/10 == 0)
{
displayText = displayText + ".0" + month;
}
else
{
displayText = displayText + "." + month;
}
if (startingDate.getDate()/10 == 0)
{
displayText = displayText + ".0" + startingDate.getDate();
}
else
{
displayText = displayText + "." + startingDate.getDate();
}
if (startingDate.getHours()/10 == 0)
{
displayText = displayText + ". 0" + startingDate.getHours();
}
else
{
displayText = displayText + ". " + startingDate.getHours();
}
if (startingDate.getMinutes()/10 == 0)
{
displayText = displayText + ":0" + startingDate.getMinutes();
}
else
{
displayText = displayText + ":" + startingDate.getMinutes();
}
mStartingDate.setText(displayText);
setUpRecyclerView();
subscribe();
}
private void setUpRecyclerView() {
adapter = new SubscribedUsersAdapter(this,subscribedUsers);
mRecyclerView.setAdapter(adapter);
}
private void subscribe()
{
FirebaseAuth mAuth = FirebaseAuth.getInstance();
if (mAuth.getCurrentUser() != null) {
final String userId = mAuth.getCurrentUser().getUid();
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference().child("users").child(userId);
mDatabase.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String userName = dataSnapshot.child("name").getValue().toString();
String userPicture = dataSnapshot.child("picture").getValue().toString();
User user = new User(userId, userName, userPicture);
userSubscribe(user);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
else
{
userSubscribe(null);
}
}
private void userSubscribe(final User user) {
Button mSubscribeButton = (Button) findViewById(R.id.subscribeButton);
if (user == null)
{
mSubscribeButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(EventDetailsActivity.this, getResources().getString(R.string.logInToSubscribe), Toast.LENGTH_LONG).show();
Intent loginIntent = new Intent(EventDetailsActivity.this, LoginActivity.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(loginIntent);
}
});
}
else if (containsUser(subscribedUsers,user) == -1)
{
mSubscribeButton.setText(getResources().getString(R.string.subscribe));
mSubscribeButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference().child("events").child(event.getEventId());
subscribedUsers.add(user);
mDatabase.child("subscribedUsers").setValue(subscribedUsers);
}
});
}
else
{
mSubscribeButton.setText(getResources().getString(R.string.unsubscribe));
mSubscribeButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference().child("events").child(event.getEventId());
int position = containsUser(subscribedUsers,user);
subscribedUsers.remove(position);
mDatabase.child("subscribedUsers").removeValue();
mDatabase.child("subscribedUsers").setValue(subscribedUsers);
}
});
}
}
#Override
public void onBackPressed() {
super.onBackPressed();
this.finish();
}
private int containsUser(ArrayList<User> users, User user)
{
for (int i=0; i<users.size(); ++i)
{
if (users.get(i).getUserId().equals(user.getUserId()))
{
return i;
}
}
return -1;
}
}
And my adapter:
public class SubscribedUsersAdapter extends RecyclerView.Adapter<SubscribedUsersAdapter.ViewHolder>{
private Context context;
private ArrayList<User> items;
public SubscribedUsersAdapter(Context context, ArrayList<User> items) {
this.context = context;
this.items = items;
}
protected static class ViewHolder extends RecyclerView.ViewHolder {
public ImageView mProfilePictureView;
public TextView mUserName;
public ViewHolder(View itemView) {
super(itemView);
mProfilePictureView = (ImageView) itemView.findViewById(R.id.profilePictureView);
mUserName = (TextView) itemView.findViewById(R.id.userName);
}
}
#Override
public SubscribedUsersAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_user, parent, false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
final User item = items.get(position);
Glide
.with(context)
.load(item.getPicture())
.into(holder.mProfilePictureView);
holder.mUserName.setText(item.getName());
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent profileIntent = new Intent(context, ProfileActivity.class);
profileIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
profileIntent.putExtra("userId", item.getUserId());
context.startActivity(profileIntent);
}
});
}
#Override
public int getItemCount() {
return items.size();
}
}
When the activity starts firstly, the data is displayed well in RecyclerView, but if a user subscribes to the event or unsubscribe from it, the RecyclerView will be empty.
I tried with notifyDataSetChanged, notifyItemRangeInserted, notifyItemRangeRemoved, but none of them worked or I didn't use it well. I don't know.
Thanks for your help!

for (DataSnapshot childSnapshot : dataSnapshot.getChildren()) {
String userId = childSnapshot.child("userId").getValue().toString();
String name = childSnapshot.child("name").getValue().toString();
String picture = childSnapshot.child("picture").getValue().toString();
User subscribedUser = new User(userId, name, picture);
if (containsUser(subscribedUsers, subscribedUser) == -1) {
subscribedUsers.add(subscribedUser);
}
}
after that just add this line
adapter.notifyDataSetChanged();

Firebase timestamp show int number

I am using firebase to view timestamp and after I save the stored the timestamp in my firebase the issue is how to convert the int number value to correctly value like "1 hr" ...
When I retrieve the timestamp it get int number ex:"1487330278409"
here's my value which named "creationDate"
how to get timestamp ex: 3 hours ago, 1 day, just now.
here's my fragment
public class Challenges extends Fragment{
private RecyclerView mPostList;
private DatabaseReference mDatabase,mDatabaseFriends,mDatabaseLike;
private SwipeRefreshLayout mRefreshLayout;
private boolean mProcessLike = false;
private String AA;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mListener;
private Query mQuery;
private FirebaseUser mCurrentUser;
public Challenges() {}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MultiDex.install(getActivity());}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v= inflater.inflate(R.layout.challenges, container, false);
mListener = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
final FirebaseUser User = firebaseAuth.getCurrentUser();
if (User == null) {
Intent A = new Intent(getActivity(), Login.class);
startActivity(A);}}};
mPostList=(RecyclerView)v.findViewById(R.id.PostList);
mPostList.setHasFixedSize(true);
mPostList.setItemAnimator(new DefaultItemAnimator());
mPostList.setLayoutManager(new LinearLayoutManager(getActivity()));
//AA = getActivity().getIntent().getExtras().getString("QQ");
//Firebase
mDatabase= FirebaseDatabase.getInstance().getReference().child("Posts");
mDatabaseFriends= FirebaseDatabase.getInstance().getReference().child("Friends");
mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
mDatabase.keepSynced(true);
mDatabaseLike.keepSynced(true);
mAuth = FirebaseAuth.getInstance();
mCurrentUser = mAuth.getCurrentUser();
mRefreshLayout=(SwipeRefreshLayout)v.findViewById(R.id.RefreshLayout);
//mQuery = mDatabase.orderByChild("UID").equalTo(String.valueOf(mDatabaseFriends.child(mCurrentUser.getUid()).child("Accepted")));
mRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
onStart();}});
return v;}
#Override
public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mListener);
mRefreshLayout.setRefreshing(true);
final FirebaseRecyclerAdapter<Getting_Posts, PostViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Getting_Posts, PostViewHolder>(
Getting_Posts.class, R.layout.post_card_design, PostViewHolder.class, mDatabase) {
#SuppressLint("SetTextI18n")
#Override
protected void populateViewHolder(final PostViewHolder viewHolder, final Getting_Posts model, int position) {
final String Post_Key = getRef(position).getKey();
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent A = new Intent(getActivity(), com.pcsoftgroup.test.activities.Single_view.class);
A.putExtra("Key", Post_Key);
startActivity(A);}
});
viewHolder.setUsername(model.getUsername());
viewHolder.setProfile(getActivity().getApplicationContext(), model.getProfile());
viewHolder.setDescribe(model.getDescribe());
viewHolder.setWallpaper(getActivity().getApplicationContext(), model.getWallpaper());
viewHolder.setLike(Post_Key);
viewHolder.setLikeNum(Post_Key);
viewHolder.setCommentNum(Post_Key);
viewHolder.mPostTime.setText(model.getTime());
//viewHolder.mPostTime.setText(model.getDate());
//viewHolder.mPostATime.setText(model.getTime());
viewHolder.mLike.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mProcessLike = true;
mDatabaseLike.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (mProcessLike) {
if (dataSnapshot.child(Post_Key).hasChild(mCurrentUser.getUid())) {
mDatabaseLike.child(Post_Key).child(mCurrentUser.getUid()).removeValue();
mProcessLike = false;
} else {
mDatabaseLike.child(Post_Key).child(mCurrentUser.getUid()).setValue("LIKED");
mProcessLike = false;
}
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
viewHolder.mShare.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
//sendIntent.putExtra(Intent.EXTRA_TEXT,viewHolder.mComment.getText().toString());
sendIntent.setType("text/plain");
Intent.createChooser(sendIntent, "Share via");
startActivity(sendIntent);
}
});
mRefreshLayout.setRefreshing(false);
mRefreshLayout.setEnabled(true);
}
};
mPostList.setAdapter(firebaseRecyclerAdapter);}
public static class PostViewHolder extends RecyclerView.ViewHolder{
//Main
View mView;
ImageButton mLike;
ImageButton mCommentBtn;
ImageButton mShare;
//Firebase
TextView mPostTime;
TextView mPostATime;
FirebaseAuth mAuth;
FirebaseUser mCurrentUser;
DatabaseReference mDatabaseLike;
DatabaseReference mDatabaseComment;
public PostViewHolder(View itemView) {
super(itemView);
//Main
mView=itemView;
mPostATime = (TextView) mView.findViewById(R.id.PostATime);
mLike=(ImageButton) mView.findViewById(R.id.PostLike);
mCommentBtn = (ImageButton) mView.findViewById(R.id.PostCommentBtn);
mShare = (ImageButton) mView.findViewById(R.id.PostShare);
mPostTime = (TextView) mView.findViewById(R.id.PostTime);
//Firebase
mAuth =FirebaseAuth.getInstance();
mCurrentUser=mAuth.getCurrentUser();
mDatabaseComment = FirebaseDatabase.getInstance().getReference().child("Comments");
mDatabaseLike= FirebaseDatabase.getInstance().getReference().child("Likes");
mDatabaseLike.keepSynced(true);
mDatabaseComment.keepSynced(true);
}
//Like
void setLike(final String Post_Key){
mDatabaseLike.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.child(Post_Key).hasChild(mCurrentUser.getUid())){
mLike.setImageResource(R.drawable.like_icon);
}else {mLike.setImageResource(R.drawable.unlike_icon);}}
#Override
public void onCancelled(DatabaseError databaseError) {}});}
void setLikeNum(final String Post_Key){
mDatabaseLike.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String A = String.valueOf(dataSnapshot.child(Post_Key).getChildrenCount());
TextView PostLikeNum = (TextView) mView.findViewById(R.id.PostLikeNum);
PostLikeNum.setText(A);}
#Override
public void onCancelled(DatabaseError databaseError) {}});}
void setCommentNum(final String Post_Key){
mDatabaseComment.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String C = String.valueOf(dataSnapshot.child(Post_Key).getChildrenCount());
TextView PostCommentNum = (TextView) mView.findViewById(R.id.PostCommentNum);
PostCommentNum.setText(C);}
#Override
public void onCancelled(DatabaseError databaseError) {}});}
//Username
public void setUsername(String Username){
TextView PostUsername = (TextView) mView.findViewById(R.id.PostUsername);
PostUsername.setText(Username);}
//Profile
void setProfile(Context ctx2, String Profile){
ImageView PostProfile = (ImageView) mView.findViewById(R.id.PostUserImage);
if (Profile == null){PostProfile.setVisibility(View.VISIBLE);}
else {PostProfile.setVisibility(View.VISIBLE);
Picasso.with(ctx2).load(Profile).resize(120,120).into(PostProfile);}}
//Describe
void setDescribe(String Describe){
TextView PostDescribe = (TextView) mView.findViewById(R.id.PostDesc);
PostDescribe.setText(Describe);}
//Image Load
void setWallpaper(Context ctx, String Image){
ImageView PostWallpaper = (ImageView) mView.findViewById(R.id.PostWallpaper);
if (Image == null){PostWallpaper.setVisibility(View.VISIBLE);}
else {
PostWallpaper.setVisibility(View.VISIBLE);
Picasso.with(ctx).load(Image).resize(1200,600).into(PostWallpaper);}}
}}
and here's my getter and setter java:
public class Getting_Posts {
private String Username;
private String Profile;
private String Describe;
private String Wallpaper;
private String Time;
public Getting_Posts() {
}
public Getting_Posts(String Time, String Username, String Profile, String Describe, String Wallpaper) {
this.Username = Username;
this.Profile = Profile;
this.Describe = Describe;
this.Wallpaper = Wallpaper;
this.Time = Time;
}
public String getDescribe() {
return Describe;
}
public void setDescribe(String describe) {
Describe = describe;
}
public String getWallpaper() {
return Wallpaper;
}
public void setWallpaper(String wallpaper) {
Wallpaper = wallpaper;
}
public String getUsername() {
return Username;
}
public void setUsername(String username) {
Username = username;
}
public String getProfile() {
return Profile;
}
public void setProfile(String profile) {
Profile = profile;
}
public String getTime() {
return Time;
}
public void setTime(String time) {
Time = time;
}
}
Any help please

The retrieved value is a long value representing Milliseconds elapsed since the Epoch time.
You can set this inside a Date object and get the normal human readable version:
Date currentDate = new Date(your_retreived_long_timestamp);
System.out.println(currentDate);
Difference between the currenttimestamp long value and an old timestamp will give the time passed since the old value..
eg : if currenttimestamp - oldtimestamp = 60000
It shows that the oldtimestamp happened a minute ago (60sec * 1000), similarly find the other values as you want
You can then use the current time and the obtained time and find the difference yourself.