Firebase with android 2 nodes with the same database reference, is it possible?

Question

I am trying to avoid the asynchronous layout pefromaed naturally with Firebase. so I am trying to complete my method in the one dataonchanged method.

I need to know is it possible and how i can reference 2 nodes as you can see , using the one reference. iv tried something like

dataBaseLastIn = FirebaseDatabase.getInstance().getReference("clockInDate" + "clockOutDate");

//and

dataBaseLastIn = FirebaseDatabase.getInstance().getReference("clockInDate");
dataBaseLastIn = FirebaseDatabase.getInstance().getReference("clockOutDate");

//Method that works to set text to one reference but not both

protected void onStart() {
        super.onStart();
        final String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
        dataBaseLastIn.addValueEventListener(new ValueEventListener(){

            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                dateinList.clear();
                dateOutList.clear();
                for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                    Date date = postSnapshot.getValue(Date.class);
                    String datt = date.getDate().toString().trim();
                    String user = date.getCurrUser().toString().trim();
                    if (DateNew.equals(datt) && user.equals(uid)) {
                        dateinList.add(date);
                    } else {
                        dateinList.remove(date);
                    }

                    DateOut dateOut = postSnapshot.getValue(DateOut.class);
                    String dattOut = dateOut.getDate().toString().trim();
                    String userOut = dateOut.getCurrUser().toString().trim();
                    if (DateNew.equals(dattOut) && userOut.equals(uid)) {
                        dateOutList.add(dateOut);
                    } else {
                        dateOutList.remove(date);
                    }
                }

                newList = dateinList;
                outList = dateOutList;
                try {
                    totalINList();
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
            }
        });

    }

//setting the text

 public void totalINList() throws ParseException {
        for(int i = 0 ; i < newList.size(); i++) {
            timeDuration.add(newList.get(i).getClockTime());
        }
        Date e = newList.get(newList.size() - 1);
        String timeIn = e.getClockTime();
        txtCurrentTime.setText(timeIn);

        for(int i = 0 ; i < outList.size(); i++) {
            timeDurationOut.add(outList.get(i).getTime());
        }
        DateOut f = outList.get(outList.size() - 1);
        String timeOut = f.getTime();
        txtCurrentTimeOut.setText(timeOut);
    }

May be something simple but i only get the value of the last reference i declare which obviously makes sense but was wondering is ther a way i can reference both nodes in the one

Possible duplicate of [How to handle asynchronous Database with Firebase?](https://stackoverflow.com/questions/48720701/how-to-handle-asynchronous-database-with-firebase) — Peter Haddad, Feb 21 '18 at 17:44
https://medium.com/google-developers/why-are-the-firebase-apis-asynchronous-e037a6654a93 — Doug Stevenson, Feb 21 '18 at 18:00

score 0 · Accepted Answer · answered Feb 21 '18 at 17:36

0

No, you cannot achieve something like with Firebase.

The initial response for most developers is to try and "fix" this asynchronous behavior, which I personally recommend against this. The web is asynchronous, and the sooner you accept that, the sooner you can learn how to become productive with modern web APIs.

answered Feb 21 '18 at 17:36

Alex Mamo

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I defiantly agree, I was just short on time so hoped there may have been a quick fix/(work around). I can resolve it by putting all the data under the one node in Fire-base but again its not good practice. I will read up a bit more on asynchronous, I know it will benefit me more in the long run – James Ferry Feb 21 '18 at 17:58
For a better understanding, take a look at my answer from this [post](https://stackoverflow.com/questions/47847694/how-to-return-datasnapshot-value-as-a-result-of-a-method/47853774). – Alex Mamo Feb 21 '18 at 18:30
Thanks for the link, I re-framed the code in the ondata changed and linked 2 entities together in another table in the database so was able to get it that way. Thanks for your help, much appreciated :-) – James Ferry Feb 26 '18 at 17:37

Firebase with android 2 nodes with the same database reference, is it possible?

1 Answers1