如何从Alert.Builder中的多项选项中获取已检查的项目？

Question

有没有办法在下一个Alert.Builder中获取有关已检查项目的信息？当有人点击肯定按钮时,我需要在SharedPreferences中保存一些布尔值.这些布尔值来自用户在警报中所做的选择.我怎么能得到它们？

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        final SharedPreferences preferences = getSharedPreferences("type_settings", MODE_PRIVATE);

        boolean[] selectedTypes = getSelectedTypes(preferences);

        builder.setIcon(R.drawable.menu_type)
                .setTitle(R.string.list_dialog_title)
                .setMultiChoiceItems(R.array.select_type_items, selectedTypes,
                        new DialogInterface.OnMultiChoiceClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton, boolean isChecked) {
                            }
                        })
                .setPositiveButton(R.string.types_save, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        SharedPreferences.Editor prefEditor = preferences.edit();
                    }
                })
                .setNegativeButton(R.string.types_cancel, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        dialog.cancel();
                    }
                })
                .create();
        builder.show();

Answer 1

您可以使用getCheckedItemIds()或getCheckedItemPositions ()从列表视图中获取已检查项目的列表.您应该首先使用AlertDialog.getListView()对话框的列表视图.

mAlert.getListView().getCheckedItemPositions ();

Answer 2

我设法以某种方式解决了这个问题，但我不知道这是否是一个好的做法。这是代码：

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        final SharedPreferences preferences = getSharedPreferences("type_settings", MODE_PRIVATE);

        final String[] availableTypes = getResources().getStringArray(R.array.select_type_items);
        final boolean[] selectedTypes = getSelectedTypes(preferences, availableTypes);

        builder.setIcon(R.drawable.menu_type)
                .setTitle(R.string.list_dialog_title)
                .setMultiChoiceItems(R.array.select_type_items, selectedTypes,
                        new DialogInterface.OnMultiChoiceClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton, boolean isChecked) {
                                selectedTypes[whichButton] = isChecked;
                            }
                        })
                .setPositiveButton(R.string.types_save, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        SharedPreferences.Editor prefEditor = preferences.edit();
                        saveSelectedTypes(prefEditor, availableTypes, selectedTypes);
                    }
                })
                .setNegativeButton(R.string.types_cancel, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        dialog.cancel();
                    }
                })
                .create();
        builder.show();