android - 我想在列表视图中检测哪个 onFling 事件的 ListItem

Question

当识别出左右交换的投掷事件时，我需要更改列表项的视图（在 ListView 中）。

我能够识别出投掷事件，但问题是 我如何确定该投掷事件发生在哪个项目（我想知道列表中的位置）上。

Answer 1

I'm not sure if it's the best way but you can try something like this:

1. get screen height
2. count currently visible items (listView.getLastVisiblePosition() - listView.getFirstVisiblePosition())
3. calculate height of one item (I assume here that all items have the same height): screenheight/numOfItems
4. if you have Y coordinate of your touch event when fling starts you can calculate which item from the top was clicked: posY/itemHeight
5. now you can get your item: listView.getItemAtPosition(listView.getFirstVisiblePosition() + valueCalculatedInPreviousPoint)

I didn't tested it so it may not work, it's just an idea.

EDIT: And there is also this lib: https://github.com/47deg/android-swipelistview you can use it or look how they implemented it.