How can I set checkbox list items as Checked by DEFAULT in AlertDialog android?

I need to show a list of checkbox list items as CHECKED in ALERTDIALOG by default(when the alertbox pops up) in android.

This is my code,

 final String[] items = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
    final List<String> itemlist = Arrays.asList(items);


    AlertDialog dialog = new AlertDialog.Builder(this)
            .setTitle("Working days")
            .setMultiChoiceItems(items, seletedvaluesbool, new DialogInterface.OnMultiChoiceClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int indexSelected, boolean isChecked) {

                    if (isChecked) {
                        // If the user checked the item, add it to the selected items

                    } else if (seletedItems.contains(indexSelected)) {
                        // Else, if the item is already in the array, remove it

                    }
                }
            }).setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {

                }
            }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    //  Your code when user clicked on Cancel
                }
            }).create();
    dialog.show();

    }

When the dialog pops up, I need to show few items as Checked by default. I tried below code for that but it's not working.

    ListView lv = ((AlertDialog) dialog).getListView();
    dialog.getListView().setSelection(0); //To set the 0th position as checked

Any help would be great. Thanks in advance.