How To Retrieve All The Data Within Nested Firebase Database

In the code sample the key nodes below Bookings are userIds(2 users) followed by a random push() key. I want to retrieve the data nested within both the userIds. databaseReference

Solution 1:

Please use this code:

databaseReference = FirebaseDatabase.getInstance().getReference().child("Bookings");
ValueEventListener eventListener = newValueEventListener() {
    @OverridepublicvoidonDataChange(DataSnapshot dataSnapshot) {
        String userId = dataSnapshot.getKey();

        DatabaseReference keyRef = FirebaseDatabase.getInstance().getReference().child("Bookings").child(userId);
        ValueEventListener valueEventListener = newValueEventListener() {
            @OverridepublicvoidonDataChange(DataSnapshot dataSnapshot) {
                for(DataSnapshot ds : dataSnapshot.getChildren()) {
                    StringClient_name = ds.child("Client_name").getValue(String.class);
                    StringData = ds.child("Data").getValue(String.class);
                    //and so on
                }
            }

            @OverridepublicvoidonCancelled(DatabaseError databaseError) {}
        };
        keyRef.addListenerForSingleValueEvent(valueEventListener);
    }

    @OverridepublicvoidonCancelled(DatabaseError databaseError) {}
};
databaseReference.addListenerForSingleValueEvent(eventListener);

Hope it helps.