public class TransactionAdapter extends BaseAdapter implements OnCheckedChangeListener {

    private LayoutInflater inflater;
    private Account account;
    private List<Transaction> transactions = new LinkedList<Transaction>();
    private Context context;

    private Set<Integer> selection = new HashSet<Integer>();

    /* Some basic adapter logic */

    public int countSelected() {
        return selection.size();
    }

    public void clearSelection() {
        selection.clear();
        notifyDataSetChanged();
    }

    public void checkedStateChanged(int position, boolean checked) {
        if (checked && !selection.contains(position)) {
            selection.add(position);
        } else if (!checked && selection.contains(position)) {
            selection.remove(position);
        }
        notifyDataSetChanged();
    }

    @Override
    public View getView(int location, View view, ViewGroup parent) {

        if (view == null) {
            view = this.inflater.inflate(R.layout.row_transaction, null);
            CheckBox checkbox = (CheckBox) view.findViewById(R.id.row_transaction_checkbox);
            checkbox.setOnCheckedChangeListener(this);
        }

        TextView date = (TextView) view.findViewById(R.id.row_transaction_date);
        TextView description = (TextView) view.findViewById(R.id.row_transaction_description);
        TextView amount = (TextView) view.findViewById(R.id.row_transaction_amount);
        CheckBox checkbox = (CheckBox) view.findViewById(R.id.row_transaction_checkbox);

        NumberFormat amountFormat = NumberFormat.getCurrencyInstance();

        if (location == 0) { // First is the balance
            /* Not usefull code */
        } else {
            Transaction transaction = (Transaction) getItem(location);

            if (transaction != null) {
                DateFormat dateFormat = android.text.format.DateFormat.getDateFormat(context);

                date.setText(dateFormat.format(transaction.getDate()));

                    description.setText(transaction.getShownDescription(context));

                amount.setText(amountFormat.format(transaction.getAmount()));


                checkbox.setVisibility(View.VISIBLE);
                checkbox.setTag(location);

                if (selection.contains((Integer) location)) {
                    checkbox.setChecked(true);
                    view.setBackgroundColor(context.getResources().getColor(android.R.color.holo_blue_light));
                } else {
                    checkbox.setChecked(false);
                    view.setBackgroundColor(context.getResources().getColor(android.R.color.background_light));
                }

            }
        }

        return view;
    }

    // Not used at the moment but i want to have a callback to my activity to manually start the action bar
    public void setOnCheckedChangeListener(OnCheckedChangeListener callback) {
        this.callback = callback;
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked) {
            selection.add((Integer) buttonView.getTag());
        } else {
            selection.remove((Integer) buttonView.getTag());
        }

        ListView list = (ListView) buttonView.getParent().getParent();
        if (list != null) {
            list.setItemChecked((Integer) buttonView.getTag(), isChecked);
        }

        if (callback != null) { //Call the activity to start the action bar
            callback.onCheckedChanged(buttonView, isChecked);
        }
    }

}


// In my activity
    private boolean contextModeActivated = false;
    public MultiChoiceModeListener multiChoiceMode = new MultiChoiceModeListener() {
        @Override
        public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
            transactionAdapter.checkedStateChanged(position, checked);

            NumberFormat amountFormat = NumberFormat.getCurrencyInstance();
            mode.setTitle(amountFormat.format(transactionAdapter.getTotalAmountSelected()));
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {

            Intent intent;

            switch (item.getItemId()) {
            case R.id.menu_conciliate:
                account.addToBalance(transactionAdapter.getTotalAmountSelected());
                transactionAdapter.removeConciliateTransaction();
                account.save();
                mode.finish();
                return true;
            case R.id.menu_add_transaction:
                intent = new Intent(getActivity(), AddTransaction.class);
                intent.putExtra(AddTransaction.ACCOUNT_ID_TAG, getActivity().getActionBar()
                        .getSelectedNavigationIndex());

                startActivityForResult(intent, MainActivity.ADD_TRANSACTION_REQUEST);
                return true;

            case R.id.menu_settings:
                intent = new Intent(getActivity(), Preference.class);
                startActivityForResult(intent, MainActivity.PREFERENCE_REQUEST);
                return true;

            default:
                return false;
            }
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            MenuInflater inflater = mode.getMenuInflater();
            inflater.inflate(R.menu.transaction_context_menu, menu);
            return true;
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            transactionAdapter.clearSelection();
        }

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false;
        }
    };

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Intent intent = new Intent(getActivity(), AddTransaction.class);
        intent.putExtra(AddTransaction.ACCOUNT_ID_TAG, getActivity().getActionBar().getSelectedNavigationIndex());
        intent.putExtra(AddTransaction.TRANSACTION_ID_TAG, transactionAdapter.getTransaction(position).getId());

        startActivityForResult(intent, MainActivity.ADD_TRANSACTION_REQUEST);
    }

    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
        ((CheckBox) view.findViewById(R.id.row_transaction_checkbox)).setChecked(true);
        return true;
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (transactionAdapter.countSelected() > 0 && !contextModeActivated) {
            getActivity().startActionMode(multiChoiceMode);
            contextModeActivated = true;
        } else if (transactionAdapter.countSelected() == 0 && contextModeActivated){
            // Close the context menu ??
            contextModeActivated = false;
        }
    }