CODEWITHSUNDEEP
javaandroidfirebasefirebase-realtime-database
zkvsl
zkvsl

Reputation: 89

How do you append to an array list in realtime database?

I have a database of users with their emails, role and list of contacts.

enter image description here

I have code to add contacts that when you input into the EditText, it checks through the database if the email exists and if it does, it appends the email into the contacts list. However, nothing gets added in my database.

    public void searchContacts(final String emailInput){
    final DatabaseReference users;

    users = FirebaseDatabase.getInstance().getReference("users");
    users.orderByChild("email").equalTo(emailInput).addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for (DataSnapshot userSnapshot: dataSnapshot.getChildren()){
                if((userSnapshot.child("email").getValue(String.class).equals(emailInput))){
                    users.child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("contacts").child(emailInput).setValue(true);
                }
            }
        }

Upvotes: 0

Views: 73

Answers (1)

Alex Mamo
Alex Mamo

Reputation: 1

Nothing is added, because you haven't create a list yet. To solve this, please use the following code:

public void searchContacts(final String emailInput){
    DatabaseReference users = FirebaseDatabase.getInstance().getReference("users");
    users.orderByChild("email").equalTo(emailInput).addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            List<String> list = new ArrayList<>(); //Create the list
            for (DataSnapshot userSnapshot: dataSnapshot.getChildren()){
                String email = userSnapshot.child("email").getValue(String.class);
                if(email.equals(emailInput)){
                    users.child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("contacts").child(emailInput).setValue(true);
                    list.add(email); //Add the email the list
                }
            }

            //Do what you need to do with list
        }
    }
}

Upvotes: 1

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