Android:如何刷新 ListView 内容? [英] Android: how to refresh ListView contents?

问题描述

我的 ListView 正在使用 BaseAdapter 的扩展，我无法正确刷新它.当我刷新时，旧数据似乎在新数据之上绘制，直到发生滚动事件.旧行绘制在新行之上，但当我开始滚动时旧行消失.

My ListView is using an extension of BaseAdapter, I can not get it to refresh properly. When I refresh, it appears that the old data draws on top of the new data, until a scroll event happens. The old rows draw on top of the new rows, but the old rows disappear when I start scrolling.

我尝试过调用 invalidateViews()、notifyDataSetChanged() 和 notifyDataSetInvalidated().我的代码看起来像:

I have tried calling invalidateViews(), notifyDataSetChanged(), and notifyDataSetInvalidated(). My code looks something like:

private void updateData()
{
   List<DataItems> newList = getNewList();

   MyAdapter adapter = new MyAdapter(getContext());
   //my adapter holds an internal list of DataItems
   adapter.setList(newList);
   mList.setAdapter(adapter);
   adapter.notifyDataSetChanged();
   mList.invalidateViews();
}

推荐答案

对于那些仍然有问题的人，我是这样解决的:

To those still having problems, I solved it this way:

List<Item> newItems = databaseHandler.getItems();
ListArrayAdapter.clear();
ListArrayAdapter.addAll(newItems);
ListArrayAdapter.notifyDataSetChanged();
databaseHandler.close();

我首先从适配器清除数据，然后添加新的项目集合，然后才设置 notifyDataSetChanged();一开始我并不清楚这一点，所以我想指出这一点.请注意，如果不调用 notifyDataSetChanged()，视图将不会更新.

I first cleared the data from the adapter, then added the new collection of items, and only then set notifyDataSetChanged(); This was not clear for me at first, so I wanted to point this out. Take note that without calling notifyDataSetChanged() the view won't be updated.

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