Android ListView with fast scroll and alphabetical section index

Question

How to add testview when touching a letter on right alphabet panel as shown in images? Could you please help me? Below is my code.

In details, I am looking for an e

Answer 1

I have displayed the list inside a fragment, if you want to display in main activity then you can pass this, instead of getActivity()

//method to display the side indexed scroll list of alphabets 
    public void displayAlphabetsList() {
        final List listOfAlphabet = new ArrayList<>();
        for (int i = 0; i < 26; i++) {
            char alphabet = (char) (ASCII_VALUE_OF_A + i);
            listOfAlphabet.add(String.valueOf(alphabet));
        }

        ArrayAdapter adapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, listOfAlphabet);
       alphabets_List_View.setAdapter(adapter);

        alphabets_List_View.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView parent, View view, int position, long id) {
                ///scroll the recycler view to that position where matching letter was found
                int positionToScroll = 0;
                for (int i = 0; i < mContacts.size(); i++) {
                    if (mContacts.get(i).getFirstName().startsWith(listOfAlphabet.get(position)))
                        break;
                    else
                        positionToScroll++;
                }
                recyclerView.scrollToPosition(positionToScroll);
            }
        });
    }