public class AdapterContacts extends BaseAdapter implements OnClickListener {

ToggleButton btnIsSending;
     .
     .
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   public View getView(int position, View convertView, ViewGroup viewGroup) {
    Contact entry = contactsList.get(position);
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.contact_row, null);
    }
     .
     .
     .
   // isSending button
    btnIsSending = (ToggleButton) convertView.findViewById(R.id.btnIsSending);
    btnIsSending.setFocusableInTouchMode(false);
    btnIsSending.setFocusable(false);
    btnIsSending.setOnClickListener(this);
    btnIsSending.setTag(entry);

    return convertView;
}

    public void onClick(View view) {
    final Contact entry = (Contact) view.getTag();
    Log.d(TAG, "entry " + entry.getPhoneNr());

    LookalizeData lookData = (LookalizeApp.getContext()).lookalizeData;
    // Toggle send button
    if( view.getId() == btnIsSending.getId()){
        if(btnIsSending.isChecked())
             ...
        else
                     ...
      }

ListView lv = ((ListActivity)context).getListView();
// Containing all check states
SparseBooleanArray sba = lv.getCheckedItemPositions();

btnIsSending = (ToggleButton) convertView.findViewById(R.id.btnIsSending);
btnIsSending.setFocusableInTouchMode(false);
btnIsSending.setFocusable(false);
btnIsSending.setTag(entry);

btnIsSending.setChecked(false);

// Cursor is passed as an argument.
if(sba != null)
  if(sba.get(cursor.getPosition()))
     btnIsSending.setChecked(true);