public class FlashCardsAdapter extends ArrayAdapter<FileManager> {
    interface Callback {
        void onFileDeleted(String fileName);
    }

    private final Callback mCallback;

    public FlashCardsAdapter(Context context, ArrayList<FileManager> users, final Callback callback) {
        super(context, 0, users);
        mCallback = callback;
    }
    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        final FileManager manager = getItem(position);

        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.list_view_item, parent, false);
        }

        TextView mainTextView = convertView.findViewById(R.id.deck_name_id);

        Button addCardButton = convertView.findViewById(R.id.action_add_card);

        Button deleteDeckButton = convertView.findViewById(R.id.action_delete);

        mainTextView.setText(manager.getFileName());

        mainTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getContext(), FlashCardActivity.class);
                intent.putExtra("fileName", manager.getFileName());
                getContext().startActivity(intent);
            }
        });

        addCardButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(getContext(), AddCardActivity.class);
                intent.putExtra("fileName", manager.getFileName());
                getContext().startActivity(intent);
            }
        });

        deleteDeckButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch (which){
                            case DialogInterface.BUTTON_POSITIVE:
                                manager.deleteFile();
                                mCallback.onFileDeleted(manager.getFileName());
                                break;

                            case DialogInterface.BUTTON_NEGATIVE:
                                //No button clicked
                                break;
                        }
                    }
                };
                AlertDialog.Builder builder = new AlertDialog.Builder(getContext().getApplicationContext());
                builder.setMessage("Are you sure?").setPositiveButton("Yes", dialogClickListener)
                        .setNegativeButton("No", dialogClickListener).show();
                AlertDialog areYouSureDialog = builder.create();
                areYouSureDialog.show();
            }
        });
        return convertView;
    }
}