Question

我从服务器获得List，我在MultiChoice AlertDialog中显示为字段。当用户检查字段时，我将其放在另一个List中。但我只把它们作为整数。我怎么知道哪一个被检查了，因为我需要该项目的名称？

List<Integer> mSelectedItems = new ArrayList<>();

    @Override
    public void renderGenreList(List<Genre> genreList) {
        CharSequence[] genreChar = convertGenreList(genreList);
        genreDialog(genreChar);
    }

private CharSequence[] convertGenreList(List<Genre> genreList) {
    List<String> genreString = new ArrayList<>();
    for (int i = 0; i < genreList.size(); i++) {
        Genre genre = genreList.get(i);
        genreString.add(genre.getName());
    }
    return genreString.toArray(new CharSequence[genreString.size()]);
}

private void genreDialog(CharSequence[] genres) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
    builder
            .setTitle(R.string.multiple_choice_title)
            .setMultiChoiceItems(genres, null, (dialog, which, isChecked) -> {
                if (isChecked) {
                    mSelectedItems.add(which);
                } else if (mSelectedItems.contains(which)) {
                    mSelectedItems.remove(Integer.valueOf(which));
                }
            })
            .setPositiveButton(R.string.OK_button, (dialog, which) -> {

                dialog.dismiss();
            })
            .setNegativeButton(R.string.CANCEL_button, (dialog, which) -> dialog.dismiss());
    d = builder.create();
}

Answer 1

您的mSelectedItems列表包含所选项目列表的位置。所以你可以在下面做所有项目

for (int i = 0; i < mSelectedItems.size(); i++) {
        Genre genre = genreList.get(mSelectedItems.get(i));
        // Here genre is one of the items selected and you can get all items in this loop
}

或第二方法是将值添加到mSelectedItems而不是添加哪个获取值然后添加

替换 -

mSelectedItems.add(which);

带

mSelectedItems.add(genreList.get(which));

然后您将拥有mSelectedItems所选项目列表。更新上面的删除方法。

第三种方式是拥有对话框的实例并从那里开始。

AlertDialog mAlert = builder.create();
// Display the alert dialog on interface
mAlert.show();

// get list of selected items
mAlert.getListView().getCheckedItemPositions();

Multichoice AlertDialog将选定的值作为字符串

1 个答案: