Xtykutl

How to display new data at the top position of an adapter? Here are the coding:-

Sorry just now, I wrongly copy the coding, now I just noticed. Sorry my bad. The issues now is I want to display the latest advertisement at the top of the adapter....

mDatabase.child("Advertisement").child(mAuth.getUid()).addValueEventListener(new ValueEventListener()

    {

        @Override

        public void onDataChange(@NonNull DataSnapshot dataSnapshot)

        {

            //iterating through all the values in database

            mChildrenList = new ArrayList<>();

            for (DataSnapshot postSnapshot : dataSnapshot.getChildren())

            {

                Advertisement advertisement = postSnapshot.getValue(Advertisement.class);

                mChildrenList.add(advertisement);

            }

            //Creating adapter

            mAdapter = new AdvertisementAdapter(getApplicationContext(), mChildrenList, "AddAds");



            //Adding adapter to recyclerview

            mRecyclerView.setAdapter(mAdapter);



            //mAdapter.notifyItemChanged(0);

        }



        @Override

        public void onCancelled(@NonNull DatabaseError databaseError)

        {



        }

    });

This line:

tuitionPackageList.add(0, new TuitionPackage(tuitionPackageList));

you get an error because you are instantiating a TuitionPackage object with tuitionPackageList as a parameter and I believe this is not correct.

Earlier in the code you made the same instantiation with just:

TuitionPackage tuitionPackage = new TuitionPackage();

and you added the item to the end of the list.

Is it this item that you wanted to add at position 0?
Edit change to this:

else {

    TuitionPackage tuitionPackage = new TuitionPackage();

    tuitionPackage.setPrice(mPriceView.getText().toString());

    tuitionPackageList.add(0, tuitionPackage);

    mPackageAdapter.notifyItemInserted(0);

}

replace last else block with this

    TuitionPackage tuitionPackage = new TuitionPackage();

    tuitionPackage.setPrice(mPriceView.getText().toString());

    tuitionPackageList.add(tuitionPackage);

    mPackageAdapter.notifyDataSetChanged();

Here are my answer with the help from the above coding to sort the first ads at the top position:-

//Iterating through all the values in database

            mChildrenList = new ArrayList<>();

            for (DataSnapshot postSnapshot : dataSnapshot.getChildren())

            {

                Advertisement advertisement = postSnapshot.getValue(Advertisement.class);

                mChildrenList.add(0, advertisement);

            }



            //Creating adapter

            mAdapter = new AdvertisementAdapter(getApplicationContext(), mChildrenList, "AddAds");



            //Adding adapter to recyclerview

            mRecyclerView.setAdapter(mAdapter);

            mAdapter.notifyItemInserted(0);