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

If you want to show the alphabet clicked as a Toast (a custom toast like the one shown in the image) use this:

view.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        LayoutInflater inflater = getLayoutInflater();
        View layout = inflater.inflate(R.layout.toast_custom_layout,
        (ViewGroup) findViewById(R.id.toast_layout_root));
        Toast toast = new Toast(getApplicationContext());
        toast.setGravity(Gravity.BOTTOM, 0, 0);
        // to position the Toast on the screen
        toast.setDuration(Toast.LENGTH_LONG);
        // to set the duration, the toast should appear
        toast.setView(layout);
        // a custom layout for the toast
        toast.show();
    }
});

and your toast_custom_layout.xml will be a 100 x 100 layout with large text size

Answer 2

Hear is one cool example of what you need https://github.com/woozzu/IndexableListView

IN order to compile the project and get rid of korean text update the StringMatcher class

package com.woozzu.android.util;

public class StringMatcher {
    public static boolean match(String value, String keyword) {
        if (value == null || keyword == null)
            return false;
        if (keyword.length() > value.length())
            return false;

        int i = 0, j = 0;
        do {
            int vi = value.charAt(i);
            int kj = keyword.charAt(j);
            if (isKorean(vi) && isInitialSound(kj)) {
            } else {
                if (vi == kj) {
                    i++;
                    j++;
                } else if (j > 0)
                    break;
                else
                    i++;
            }
        } while (i < value.length() && j < keyword.length());

        return (j == keyword.length())? true : false;
    }

    private static boolean isKorean(int i) {
        return false;
    }

    private static boolean isInitialSound(int i) {
        return false;
    }
}

Answer 3

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<String> listOfAlphabet = new ArrayList<>();
        for (int i = 0; i < 26; i++) {
            char alphabet = (char) (ASCII_VALUE_OF_A + i);
            listOfAlphabet.add(String.valueOf(alphabet));
        }

        ArrayAdapter<String> 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);
            }
        });
    }