Recyclerview Single Item Selector

Question

I added a selector background for my RecyclerView items, but I need to allow only single item selection at a time. i.e if one item is selected all the rest of the items must not be selected. How can I achieve this?

Here is my adapter class

a.values_at(1..3).map! {|i| i = 0}

Answer 1

This is my sample solution:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *cellId = @"itemCell";

    NSDictionary *dictDetailList = [_arrItemList objectAtIndex:indexPath.row];

    HomeRestuTableViewCell *cell = (HomeRestuTableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellId];

    if(!cell) {
        [tableView registerNib:[UINib nibWithNibName:@"itemCell" bundle:nil] forCellReuseIdentifier:cellId];
        cell = (HomeRestuTableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellId];
    }
    [cell setupHomeRestuCell:dictDetailList];

    return cell;
}

Hope it helps you... Thanks

Answer 2

您还可以考虑使用 SelectionTracker 扩展的RecyclerView。然后，必须将一些代码添加到当前的实现中，以实现所有必需的方法。最后，在构建SelectionTracker的地方，您可以将如下所示的代码放置到Adapter类中。

构造SelectionTracker的示例代码：

SelectionTracker selectionTracker = new SelectionTracker.Builder<>(
        "example-unique-id",
        mRecyclerView,
        new UsersListAdapter.UserItemKeyProvider(list),
        new UsersListAdapter.UserItemLookup(mRecyclerView),
        StorageStrategy.createStringStorage()
    ).withSelectionPredicate(SelectionPredicates.<String>createSelectSingleAnything()).build();

方法：

withSelectionPredicate(SelectionPredicates.<String>createSelectSingleAnything())

在这里至关重要，因为它定义了“选择方法”。这里的字符串是可能的键之一。有关更多信息，请遵循：

1. 有关RecyclerView的官方指南：https://developer.android.com/guide/topics/ui/layout/recyclerview
2. Dev文档：https://developer.android.com/reference/androidx/recyclerview/selection/SelectionPredicates