How to move Firebase child from one node to another in Android?

Question

I am working on a project where user request for our valet services and on the other end valet accepts request.

I am using using Firebase as backend and on request c

Answer 1

If you want to perform a move which also erases the original, you might make use of the following snippet:

// In this piece of code, "fromPath" and "toPath" parameters act like directories.
private void removeFromFirebase(final DatabaseReference fromPath, final DatabaseReference toPath, final String key) {
    fromPath.child(key).addListenerForSingleValueEvent(new ValueEventListener() {
        // Now "DataSnapshot" holds the key and the value at the "fromPath".
        // Let's move it to the "toPath". This operation duplicates the
        // key/value pair at the "fromPath" to the "toPath".
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            toPath.child(dataSnapshot.getKey())
                    .setValue(dataSnapshot.getValue(), new DatabaseReference.CompletionListener() {
                        @Override
                        public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
                            if (databaseError == null) {
                                Log.i(TAG, "onComplete: success");
                                // In order to complete the move, we are going to erase
                                // the original copy by assigning null as its value.
                                fromPath.child(key).setValue(null);
                            }
                            else {
                                Log.e(TAG, "onComplete: failure:" + databaseError.getMessage() + ": "
                                        + databaseError.getDetails());
                            }
                        }
                    });
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.e(TAG, "onCancelled: " + databaseError.getMessage() + ": "
                    + databaseError.getDetails());
        }
    });
}