android - AlertDialog MultiChoiceItems - 一次只选择 2 个项目

Question

我的警报对话框中有 4 个复选框:A、B、C 和 D。我正在尝试让 A 只能用 B、C 或 D 选择，所以只有 2 个被选中一度。

是否有能够实现此行为的解决方案？我已经查看了我可以通过谷歌找到的内容，但我找不到任何东西。我想我需要使用共享首选项，然后单击 B、C 和 D 中的每一个后，我可以在 SP 中存储一个字符串，引用 B、C、D 中的每一个，然后它可以检查 SP 中的字符串每次单击一个时，如果从 B、C 或 D 中存储的值之一在那里，请取消选中已勾选的复选框(希望这是有意义的)，或者是否有更好的解决方案？谢谢

我目前拥有的:

boolean[] checked = new boolean[] { true, false, false, false }; //This is defined at the top of my class, so that once the dialog is first opnened, A is selected by default

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.filteroptions, menu);
    super.onCreateOptionsMenu(menu, inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.filter:

        AlertDialog dialog;

        final CharSequence[] items = { "A", "B", "C", "D" };
        // arraylist to keep the selected items
        final ArrayList<Integer> seletedItems = new ArrayList<Integer>();

        shfObject = getActivity().getSharedPreferences("NAME",
                Context.MODE_PRIVATE);
        final SharedPreferences.Editor shfEditorObject = shfObject.edit();
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("Filter");



        builder.setMultiChoiceItems(items, checked,
                new DialogInterface.OnMultiChoiceClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog,
                            int indexSelected, boolean isChecked) {

                        if (isChecked) {
                            seletedItems.add(indexSelected);

                            switch (indexSelected) {

                            case 0:
                                shfEditorObject.putString(
                                        "checkbox1Ticked", "Ticked1");

                                shfEditorObject.commit();
                                break;

                            case 1:

                                shfEditorObject.putString(
                                        "checkbox2Ticked", "Ticked2");

                                shfEditorObject.commit();

                                break;

                            case 2:

                                shfEditorObject.putString(
                                        "checkbox3Ticked", "Ticked3");

                                shfEditorObject.commit();

                                break;

                            case 3:

                                shfEditorObject.putString(
                                        "checkbox4Ticked", "Ticked4");

                                shfEditorObject.commit();

                                break;

                            }

                        }

                        else if (seletedItems.contains(indexSelected)) {
                            // Else, if the item is already in the
                            // array, remove it
                            // write your code when user Uchecked the
                            // checkbox

                        }

                    }
                })
                // Set the action buttons
                .setPositiveButton("OK",
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                    int id) {
                                // Your code when user clicked on OK
                                // You can write the code to save the
                                // selected item here

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

                            }
                        });

        dialog = builder.create();// AlertDialog dialog; create like this
                                    // outside onClick
        dialog.show();

        return true;

    default:
        break;
    }

    return true;
}

Answer 1

您应该在检查每个项目时更新计数器。当达到最大限制时，您可以禁用其他复选框。

这个问题很好地回答了- How to disable checkbox when a limit is reached in android?