如何在android中将现有数据设置为多选微调器

public class MultiSelectSpinner extends Spinner implements Spinner.OnItemSelectedListener {
    private List<String> items;
    private boolean[] selectedItems;

    public MultiSelectSpinner(Context context) {
        super(context);
        init();
    }

    public MultiSelectSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        setOnItemSelectedListener(this);
    }

    public void setItems(List<String> items) {
        this.items = items;
        selectedItems = new boolean[items.size()];
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        selectedItems[position] = !selectedItems[position];
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        // Do nothing
    }

    public List<String> getSelectedItems() {
        List<String> selected = new ArrayList<>();
        for (int i = 0; i < items.size(); i++) {
            if (selectedItems[i]) {
                selected.add(items.get(i));
            }
        }
        return selected;
    }

    @Override
    public boolean performClick() {
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        builder.setMultiChoiceItems(items.toArray(new CharSequence[items.size()]), selectedItems,
                new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        selectedItems[which] = isChecked;
                    }
                })
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // Do nothing
                    }
                })
                .show();
        return true;
    }
}

List<String> data = Arrays.asList("Option 1", "Option 2", "Option 3", "Option 4");
MultiSelectSpinner multiSelectSpinner = findViewById(R.id.multiSelectSpinner);
multiSelectSpinner.setItems(data);