Examples with ValueEventListener com.google.firebase.database.ValueEventListener used on opensource projects

Example 86 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project MadMax by deviz92.

the class ExpenseEdit method onCreate.

@Override
@TargetApi(23)
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.edit_expense);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    expenseImageView = (ImageView) this.findViewById(R.id.expense_image);
    expenseBillView = (ImageView) this.findViewById(R.id.expense_bill);
    expenseDescriptionView = (EditText) this.findViewById(R.id.expense_description);
    expenseAmountView = (EditText) this.findViewById(R.id.expense_amount);
    expenseCurrencyView = (Spinner) this.findViewById(R.id.expense_currency);
    saveButton = (Button) this.findViewById(R.id.btn_save);
    // creating spinner for currencies
    final ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.currencies, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    expenseCurrencyView.setAdapter(adapter);
    Intent intent = getIntent();
    String expenseID = intent.getStringExtra("expenseID");
    if (intent.getStringExtra("EXPENSE_TYPE").equals("EXPENSE_EDIT")) {
        EXPENSE_TYPE = Event.EventType.EXPENSE_EDIT;
        expense_type = "expenses";
    } else {
        EXPENSE_TYPE = Event.EventType.PENDING_EXPENSE_EDIT;
        expense_type = "proposedExpenses";
    }
    databaseReference.child(expense_type).child(expenseID).addListenerForSingleValueEvent(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            expense = new Expense();
            expense.setID(dataSnapshot.getKey());
            expense.setDescription(dataSnapshot.child("description").getValue(String.class));
            expense.setCurrency(dataSnapshot.child("currency").getValue(String.class));
            expense.setExpensePhoto(dataSnapshot.child("expensePhoto").getValue(String.class));
            expense.setBillPhoto(dataSnapshot.child("billPhoto").getValue(String.class));
            final String groupID = dataSnapshot.child("groupID").getValue(String.class);
            expenseDescriptionView.setText(expense.getDescription());
            if (EXPENSE_TYPE.equals(Event.EventType.PENDING_EXPENSE_EDIT)) {
                expense.setAmount(dataSnapshot.child("amount").getValue(Double.class));
                expenseAmountView.setText(String.valueOf(expense.getAmount()));
            }
            // set the defaultCurrency value for the spinner based on the user preferences
            int spinnerPosition = adapter.getPosition(expense.getCurrency());
            expenseCurrencyView.setSelection(spinnerPosition);
            // progressDialog = new ProgressDialog(ProfileEdit.this);
            // loading expense photo (if present)
            String expenseImage = expense.getExpensePhoto();
            if (expenseImage != null && !expenseImage.equals("")) {
                // Loading image
                Glide.with(getApplicationContext()).load(expenseImage).centerCrop().diskCacheStrategy(DiskCacheStrategy.ALL).into(expenseImageView);
            } else {
                // Loading image
                expenseImageView.setImageResource(R.drawable.add_photo);
            /* Glide.with(getApplicationContext()).load(R.drawable.add_photo)
                            .centerCrop()
                            //.bitmapTransform(new CropCircleTransformation(this))
                            .diskCacheStrategy(DiskCacheStrategy.ALL)
                            .into(expenseImageView);*/
            }
            expenseImageView.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    Log.i(TAG, "expense image clicked");
                    if (MainActivity.shouldAskPermission()) {
                        String[] perms = { "android.permission.READ_EXTERNAL_STORAGE" };
                        int permsRequestCode = 200;
                        requestPermissions(perms, permsRequestCode);
                    }
                    // allow to the user the choose image
                    Intent intent = new Intent();
                    // Show only images, no videos or anything else
                    intent.setType("image/*");
                    intent.setAction(Intent.ACTION_GET_CONTENT);
                    // Always show the chooser (if there are multiple options available)
                    startActivityForResult(Intent.createChooser(intent, "Select picture"), PICK_IMAGE_REQUEST);
                // now see onActivityResult
                }
            });
            // loading expense bill (if present)
            String expenseBill = expense.getBillPhoto();
            if (expenseBill != null && !expenseBill.equals("")) {
                // Loading image
                Glide.with(getApplicationContext()).load(expenseBill).centerCrop().diskCacheStrategy(DiskCacheStrategy.ALL).into(expenseBillView);
            } else {
                // Loading image
                expenseImageView.setImageResource(R.drawable.add_photo);
            /*Glide.with(getApplicationContext()).load(R.drawable.add_photo)
                            .centerCrop()
                            //.bitmapTransform(new CropCircleTransformation(this))
                            .diskCacheStrategy(DiskCacheStrategy.ALL)
                            .into(expenseBillView);*/
            }
            expenseBillView.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    Log.i(TAG, "expense bill clicked");
                    if (MainActivity.shouldAskPermission()) {
                        String[] perms = { "android.permission.READ_EXTERNAL_STORAGE" };
                        int permsRequestCode = 200;
                        requestPermissions(perms, permsRequestCode);
                    }
                    // allow to the user the choose image
                    Intent intent = new Intent();
                    // Show only images, no videos or anything else
                    intent.setType("image/*");
                    intent.setAction(Intent.ACTION_GET_CONTENT);
                    // Always show the chooser (if there are multiple options available)
                    startActivityForResult(Intent.createChooser(intent, "Select picture"), PICK_BILL_REQUEST);
                // now see onActivityResult
                }
            });
            saveButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    Log.i(TAG, "save clicked");
                    if (updateExpense(expense)) {
                        Toast.makeText(ExpenseEdit.this, getString(R.string.saved), Toast.LENGTH_SHORT).show();
                        Intent intent;
                        if (EXPENSE_TYPE.equals(Event.EventType.EXPENSE_EDIT)) {
                            intent = new Intent(getApplicationContext(), ExpenseDetailActivity.class);
                            intent.putExtra("groupID", expense.getGroupID());
                            intent.putExtra("expenseID", expense.getID());
                            intent.putExtra("userID", MainActivity.getCurrentUser().getID());
                        } else {
                            intent = new Intent(getApplicationContext(), MainActivity.class);
                            intent.putExtra("currentFragment", 2);
                        }
                        startActivity(intent);
                        finish();
                    }
                }
            });
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.w(TAG, databaseError.getMessage());
        }
    });
}

Example 87 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project MadMax by deviz92.

the class NewExpenseActivity method addEqualExpense.

void addEqualExpense(final Expense newExpense, final String groupID) {
    DatabaseReference groupRef = databaseReference.child("groups");
    groupRef.child(groupID).child("members").addListenerForSingleValueEvent(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot membersSnapshot) {
            int participantsCount = 0;
            // Attenzione! Non contare i membri eliminati tra i partecipanti alla spesa
            for (DataSnapshot memberSnap : membersSnapshot.getChildren()) {
                if (!memberSnap.child("deleted").getValue(Boolean.class)) {
                    participantsCount++;
                }
            }
            Double amountPerMember = 1 / (double) participantsCount;
            for (DataSnapshot member : membersSnapshot.getChildren()) {
                // Aggiungo alla spesa solo i membri non eliminati dal gruppo
                if (!member.child("deleted").getValue(Boolean.class)) {
                    newExpense.getParticipants().put(member.getKey(), amountPerMember);
                }
            }
            String timeStamp = new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss").format(new java.util.Date());
            newExpense.setTimestamp(timeStamp);
            if (!IMAGE_CHANGED)
                expensePhoto = null;
            if (!BILL_CHANGED)
                billPhoto = null;
            // Aggiungo una pending expense
            if (callingActivity.equals("ChooseGroupActivity")) {
                newExpense.setGroupName(groupName);
                if (groupImage != null)
                    newExpense.setGroupImage(groupImage);
                FirebaseUtils.getInstance().addPendingExpenseFirebase(newExpense, expensePhoto, getApplicationContext());
                // add event for PENDING_EXPENSE_ADD
                User currentUser = MainActivity.getCurrentUser();
                Event event = new Event(groupID, Event.EventType.PENDING_EXPENSE_ADD, currentUser.getName() + " " + currentUser.getSurname(), newExpense.getDescription(), newExpense.getAmount());
                event.setDate(new SimpleDateFormat("yyyy.MM.dd").format(new java.util.Date()));
                event.setTime(new SimpleDateFormat("HH:mm").format(new java.util.Date()));
                FirebaseUtils.getInstance().addEvent(event);
                Intent myIntent = new Intent(NewExpenseActivity.this, MainActivity.class);
                myIntent.putExtra("UID", MainActivity.getCurrentUID());
                myIntent.putExtra("currentFragment", 2);
                startActivity(myIntent);
            } else // Aggiungo una spesa normale
            {
                FirebaseUtils.getInstance().addExpenseFirebase(newExpense, expensePhoto, billPhoto, getApplicationContext());
                // add event for EXPENSE_ADD
                User currentUser = MainActivity.getCurrentUser();
                Event event = new Event(newExpense.getGroupID(), Event.EventType.EXPENSE_ADD, currentUser.getName() + " " + currentUser.getSurname(), newExpense.getDescription(), newExpense.getAmount());
                event.setDate(new SimpleDateFormat("yyyy.MM.dd").format(new java.util.Date()));
                event.setTime(new SimpleDateFormat("HH:mm").format(new java.util.Date()));
                FirebaseUtils.getInstance().addEvent(event);
            }
        }

        @Override
        public void onCancelled(DatabaseError error) {
            // Failed to read value
            Log.w(TAG, "Failed to read value.", error.toException());
        }
    });
}

Example 88 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project MadMax by deviz92.

the class NewExpenseActivity method onCreate.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_new_expense);
    context = NewExpenseActivity.this;
    SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
    String defaultCurrency = sharedPref.getString(SettingsFragment.DEFAULT_CURRENCY, "");
    IMAGE_CHANGED = false;
    BILL_CHANGED = false;
    Intent intent = getIntent();
    if (groupID == null)
        groupID = intent.getStringExtra("groupID");
    userID = intent.getStringExtra("userID");
    callingActivity = intent.getStringExtra("callingActivity");
    groupName = intent.getStringExtra("groupName");
    groupImage = intent.getStringExtra("groupImage");
    isNewPending = intent.getBooleanExtra("newPending", false);
    description = (EditText) findViewById(R.id.edit_description);
    amount = (EditText) findViewById(R.id.edit_amount);
    currency = (Spinner) findViewById(R.id.currency);
    expensePhoto = (ImageView) findViewById(R.id.img_expense);
    billPhoto = (ImageView) findViewById(R.id.img_bill);
    billPhotoText = (TextView) findViewById(R.id.tv_bill_expense);
    splitButton = (Button) findViewById(R.id.btn_split);
    unequalCheckBox = (CheckBox) findViewById(R.id.check_unequal);
    splitButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Double value = null;
            String text = amount.getText().toString();
            if (!text.isEmpty()) {
                try {
                    value = Double.parseDouble(text);
                // it means it is double
                } catch (Exception e1) {
                    // this means it is not double
                    e1.printStackTrace();
                }
                Intent intent = new Intent(NewExpenseActivity.this, SplitPolicyActivity.class);
                intent.putExtra("amount", value);
                intent.putExtra("currency", currency.getSelectedItem().toString());
                intent.putExtra("participants", members);
                intent.putExtra("totalSplit", totalSplit);
                intent.putExtra("groupID", groupID);
                intent.putExtra("userID", userID);
                intent.putExtra("callingActivity", "SplitPolicyActivity");
                intent.putExtra("groupName", groupName);
                intent.putExtra("groupImage", groupImage);
                startActivityForResult(intent, PICK_SPLIT_REQUEST);
            } else {
                Toast.makeText(getBaseContext(), "Fill amount field", Toast.LENGTH_SHORT).show();
                return;
            }
        }
    });
    // Add listener to checkbox
    addListenerOnUnequalSplit();
    if (unequalCheckBox.isChecked()) {
        equalSplit = false;
    } else {
        equalSplit = true;
        splitButton.setClickable(false);
    }
    // creating spinner for currencies
    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.currencies, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    currency.setAdapter(adapter);
    // set the defaultCurrency value for the spinner based on the user preferences
    int spinnerPosition = adapter.getPosition(defaultCurrency);
    currency.setSelection(spinnerPosition);
    // Add members of this group to a map. It's needed to pass them to SplitPolicyActivity
    databaseReference.child("groups").child(groupID).child("members").addListenerForSingleValueEvent(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot memberSnap : dataSnapshot.getChildren()) {
                if (!memberSnap.child("deleted").getValue(Boolean.class)) {
                    if (!members.containsKey(memberSnap.getKey()))
                        members.put(memberSnap.getKey(), 0d);
                }
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    });
    expensePhoto.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Log.i(TAG, "image clicked");
            // allow to the user the choose his profile image
            Intent intent = new Intent();
            // Show only images, no videos or anything else
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            // Always show the chooser (if there are multiple options available)
            startActivityForResult(Intent.createChooser(intent, "Select picture"), PICK_EXPENSE_PHOTO_REQUEST);
        // now see onActivityResult
        }
    });
    if (isNewPending) {
        billPhotoText.setVisibility(View.GONE);
        billPhoto.setVisibility(View.GONE);
        splitButton.setVisibility(View.GONE);
        unequalCheckBox.setVisibility(View.GONE);
    } else {
        billPhotoText.setVisibility(View.VISIBLE);
        billPhoto.setVisibility(View.VISIBLE);
        splitButton.setVisibility(View.VISIBLE);
        unequalCheckBox.setVisibility(View.VISIBLE);
        billPhoto.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Log.i(TAG, "image clicked");
                // allow to the user the choose his profile image
                Intent intent = new Intent();
                // Show only images, no videos or anything else
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                // Always show the chooser (if there are multiple options available)
                startActivityForResult(Intent.createChooser(intent, "Select picture"), PICK_BILL_PHOTO_REQUEST);
            // now see onActivityResult
            }
        });
    }
}

Example 89 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project MadMax by deviz92.

the class MainActivity method onStart.

@Override
protected void onStart() {
    super.onStart();
    Log.i(TAG, "onStart");
    startingIntent = getIntent();
    currentFragment = startingIntent.getIntExtra("currentFragment", 1);
    // start declaration of a listener on all the current user data -> attached in onStart()
    currentUserListener = new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Log.d(TAG, "onDataChange currentUserref");
            if (currentUser == null) {
                // makeText(MainActivity.this, "Ricreato user", Toast.LENGTH_SHORT).show(); // todo: di debug, da rimuovere
                currentUser = new User();
            }
            currentUser.setID(currentUID);
            currentUser.setName(dataSnapshot.child("name").getValue(String.class));
            currentUser.setSurname(dataSnapshot.child("surname").getValue(String.class));
            currentUser.setUsername(dataSnapshot.child("username").getValue(String.class));
            currentUser.setProfileImage(dataSnapshot.child("image").getValue(String.class));
            currentUser.setEmail(dataSnapshot.child("email").getValue(String.class));
            currentUser.setPassword(dataSnapshot.child("password").getValue(String.class));
            Log.d(TAG, "taken basic data of currentUser " + currentUser.toString());
            // get user friends's IDs
            if (dataSnapshot.child("friends").hasChildren())
                for (DataSnapshot friend : dataSnapshot.child("friends").getChildren()) {
                    if (!friend.hasChild("deleted") || !friend.child("deleted").getValue(Boolean.class))
                        currentUser.getUserFriends().put(friend.getKey(), null);
                }
            // get user groups's IDs
            if (dataSnapshot.child("groups").hasChildren())
                for (DataSnapshot group : dataSnapshot.child("groups").getChildren()) {
                    if (group.getValue(Boolean.class))
                        currentUser.getUserGroups().put(group.getKey(), null);
                }
            Log.d(TAG, "Taken friends and groups, now creating the adapter");
            if (currentFragment != null) {
                viewPager.setCurrentItem(currentFragment);
                updateFab(currentFragment);
            } else {
                viewPager.setCurrentItem(1);
                updateFab(1);
            }
            // load nav menu header data for the current user
            loadNavHeader();
            Log.d(TAG, "logged user name: " + currentUser.getName());
            Log.d(TAG, "logged user surname: " + currentUser.getSurname());
            Uri data = startingIntent.getData();
            if (data != null) {
                inviterID = data.getQueryParameter("inviterID");
                groupToBeAddedID = data.getQueryParameter("groupToBeAddedID");
            } else {
                // retrieving data from the intent inviterID & groupToBeAddedID as the group ID where to add the current user
                if (startingIntent.hasExtra("inviterID")) {
                    // to be used to set the current user as friend of the inviter
                    Log.d(TAG, "there is an invite");
                    inviterID = startingIntent.getStringExtra("inviterID");
                    startingIntent.removeExtra("inviterID");
                }
                if (startingIntent.hasExtra("groupToBeAddedID")) {
                    groupToBeAddedID = startingIntent.getStringExtra("groupToBeAddedID");
                    startingIntent.removeExtra("groupToBeAddedID");
                }
            }
            // control if user that requires the friendship is already a friend
            if (inviterID != null) {
                if (!currentUser.getUserFriends().containsKey(inviterID)) {
                    FirebaseUtils.getInstance().addFriend(inviterID);
                    inviterID = null;
                    makeText(MainActivity.this, getString(R.string.new_friend), Toast.LENGTH_LONG).show();
                }
            /*else
                        makeText(MainActivity.this, getString(R.string.already_friends), Toast.LENGTH_LONG).show();*/
            }
            // control if user is already part of requested group
            if (groupToBeAddedID != null) {
                if (!currentUser.getUserGroups().containsKey(groupToBeAddedID)) {
                    // currentUser.joinGroup(groupToBeAddedID); //todo usare questa? non aggiorna il numero dei membri
                    currentUser.getUserGroups().put(groupToBeAddedID, null);
                    FirebaseUtils.getInstance().joinGroupFirebase(currentUID, groupToBeAddedID);
                    groupToBeAddedID = null;
                    makeText(MainActivity.this, getString(R.string.join_group), Toast.LENGTH_LONG).show();
                }
            // else
            // makeText(MainActivity.this, getString(R.string.already_in_group) + "\""+currentUser.getUserGroups().get(groupToBeAddedID).getName()+"\"", Toast.LENGTH_LONG).show();
            }
            if (startingIntent.hasExtra("notificationTitle")) {
                Intent notificationIntent = null;
                switch(startingIntent.getStringExtra("notificationTitle")) {
                    case "notification_invite":
                        if (startingIntent.hasExtra("groupID")) {
                            notificationIntent = new Intent(getApplicationContext(), GroupDetailActivity.class);
                            notificationIntent.putExtra("groupID", startingIntent.getStringExtra("groupID"));
                        }
                        break;
                    case "notification_expense_added":
                        if (startingIntent.hasExtra("groupID")) {
                            notificationIntent = new Intent(getApplicationContext(), ExpenseDetailActivity.class);
                            notificationIntent.putExtra("groupID", startingIntent.getStringExtra("groupID"));
                            if (startingIntent.hasExtra("expenseID")) {
                                notificationIntent.putExtra("expenseID", startingIntent.getStringExtra("expenseID"));
                            }
                        }
                        break;
                    case "notification_expense_removed":
                        if (startingIntent.hasExtra("groupID")) {
                            notificationIntent = new Intent(getApplicationContext(), GroupDetailActivity.class);
                            notificationIntent.putExtra("groupID", startingIntent.getStringExtra("groupID"));
                        }
                        break;
                    case "notification_proposalExpense_added":
                        if (startingIntent.hasExtra("expenseID")) {
                            notificationIntent = new Intent(getApplicationContext(), PendingExpenseDetailActivity.class);
                            notificationIntent.putExtra("expenseID", startingIntent.getStringExtra("expenseID"));
                        }
                        break;
                }
                if (notificationIntent != null) {
                    notificationIntent.putExtra("userID", currentUID);
                    startingIntent.removeExtra("notificationTitle");
                    startActivityForResult(notificationIntent, REQUEST_NOTIFICATION);
                }
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            // TODO: come gestire?
            Log.d(TAG, "getting current user failed");
        }
    };
    // end of listener declaration on all the current user data
    authListener = new FirebaseAuth.AuthStateListener() {

        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            Log.d(TAG, "onAuthStateChanged");
            currentFirebaseUser = firebaseAuth.getCurrentUser();
            if (currentFirebaseUser != null && currentFirebaseUser.isEmailVerified()) {
                // getting reference to the user from db
                currentUID = currentFirebaseUser.getUid();
                currentUserRef = usersRef.child(currentUID);
                // take refreshed toked and save it to use FCM
                currentUserRef.child("token").setValue(FirebaseInstanceId.getInstance().getToken());
                Log.d(TAG, "device token: " + FirebaseInstanceId.getInstance().getToken());
                // attach a listener on all the current user data
                currentUserRef.addValueEventListener(currentUserListener);
            } else {
                Log.d(TAG, "current user is null, so go to login activity");
                Intent goToLogin = new Intent(getApplicationContext(), LoginSignUpActivity.class);
                // currentUser = null;
                startActivity(goToLogin);
                auth.removeAuthStateListener(authListener);
                finish();
            }
        }
    };
    // attach the listener to the FirebaseAuth instance
    auth.addAuthStateListener(authListener);
}

Example 90 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project MadMax by deviz92.

the class ExpenseDetailFragment method onCreateView.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    Log.i(TAG, "onCreateView");
    setInterface((OnItemClickInterface) getActivity());
    // Read expenseID from ExpenseDetailPagerAdapter
    Bundle b = this.getArguments();
    expenseID = b.getString("expenseID");
    final View view = inflater.inflate(R.layout.skeleton_list, container, false);
    RecyclerView.ItemDecoration divider = new InsetDivider.Builder(getContext()).orientation(InsetDivider.VERTICAL_LIST).dividerHeight(getResources().getDimensionPixelSize(R.dimen.divider_height)).color(ContextCompat.getColor(getContext(), R.color.colorDivider)).insets(getResources().getDimensionPixelSize(R.dimen.divider_inset), 0).overlay(true).build();
    recyclerView = (RecyclerView) view.findViewById(R.id.rv_skeleton);
    layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.addItemDecoration(divider);
    participantsViewAdapter = new ParticipantsViewAdapter(this.getContext(), this, participants);
    recyclerView.setAdapter(participantsViewAdapter);
    // Ascolto i participants alla spesa
    databaseReference.child("expenses").child(expenseID).addListenerForSingleValueEvent(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            // Per ogni participant
            for (DataSnapshot participantSnap : dataSnapshot.child("participants").getChildren()) {
                Double alreadyPaid = participantSnap.child("alreadyPaid").getValue(Double.class);
                Double dueImport = alreadyPaid - participantSnap.child("fraction").getValue(Double.class) * dataSnapshot.child("amount").getValue(Double.class);
                String currency = dataSnapshot.child("currency").getValue(String.class);
                User u = new User();
                u.setAlreadyPaid(alreadyPaid);
                u.setDueImport(dueImport);
                u.setExpenseCurrency(currency);
                String participantID = participantSnap.getKey();
                FirebaseUtils.getInstance().getParticipantName(participantID, participants, participantsViewAdapter, u);
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.w(TAG, databaseError.toException());
        }
    });
    return view;
}