CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
Mohan
Mohan

Reputation: 75

How to retrieve the list of data under 1 child in Firebase Database in Android Studio

Data stored in firebase:

 29-06-2018(date)

     -AAAA
           -25142(jobno)
           -Park station(address)
           -BMW(model)

     -BBBB 
           -85142(jobno)
           -Base station(address)
           -Ford(model)

Here I want all the children under -BBBB. Don't want to loop through AAAA. How to get directly the child of BBBB. I'm having data (date, BBBB). Just want to get jobno, address, model of BBBB. Please suggest me a solution.

My code is here

DatabaseReference database = FirebaseDatabase.getInstance().getReference();
        DatabaseReference pwd = database.child("29-06-2018").child("BBBB");

        pwd.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot ds : dataSnapshot.getChildren()) {    
                        String a = ds.child("jobno").getValue(String.class);
                        String b = ds.child("address").getValue(String.class);
                        String c = ds.child("model").getValue(String.class);

                }
            }

            @Override
            public void onCancelled(DatabaseError error) {

            }

        });

Upvotes: 1

Views: 132

Answers (2)

Frank van Puffelen
Frank van Puffelen

Reputation: 599551

You're listening to a single child /29-06-2018/BBBB. By looping over dataSnapshot.getChildren() you're looping over each property, and then try to reach a child property for each. That won't work, so you should get rid of the loop in onDataChange:

pwd.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot ds) {
        String a = ds.child("jobno").getValue(String.class);
        String b = ds.child("address").getValue(String.class);
        String c = ds.child("model").getValue(String.class);
    }

Upvotes: 2

Mohan
Mohan

Reputation: 75

DatabaseReference database = FirebaseDatabase.getInstance().getReference();
        DatabaseReference pwd = database.child("29-06-2018").child("BBBB");

        pwd.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                        String a = dataSnapshot.child("jobno").getValue(String.class);
                        String b = dataSnapshot.child("address").getValue(String.class);
                        String c = dataSnapshot.child("model").getValue(String.class);


            }

            @Override
            public void onCancelled(DatabaseError error) {

            }

        });

Upvotes: 0

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