android firebase : NOT EQUAL query in Firebase Database

Question

I have users object as below:

{
  \"deviceTokens\" : {
    \"SgJd7o1hK7YbJnygnYWvaz4qkr42\" : {
      \"c-sfcTB3iEA:APA91bEvuzhX1nlrhoxVmR69lvwu0H1zyRjOXd5b1         


        

Answer 1

Actually, I didn't wanted to create my own adapter, because I believed that FirebaseUI would not have such a limitation, but I was wrong. Anyways, this is how I approached:

First of all fetch all the data from the User Object from FirebaseDatabase and then, filter on our end and finally, set that data:

FirebaseDatabase.getInstance().getReference().child("users")
   .addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Iterable list = dataSnapshot.getChildren();

            // Getting current user Id
            String uid = getCurrentUserId();

            // Filter User
            List userList = new ArrayList<>();
            for (DataSnapshot dataSnapshot1 : list) {
                if (!dataSnapshot1.getKey().equals(uid)) {
                    userList.add(dataSnapshot1.getValue(User.class));
                }
            }

            // Setting data
            mBaseRecyclerAdapter.setItems(userList);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

I have created my own generic recycler adapter here: https://gist.github.com/chintansoni202/3c61aea787ae4bd49f26adee9dd40a08