使用 SimpleCursorAdapter 更新 Android ListView [英] Android ListView update with SimpleCursorAdapter

问题描述

嘿，我使用列表视图来演示存储在数据库中的条目.我还有一个 EditText 元素和一个按钮，用于将 EditText 的内容添加到数据库中.要将视图绑定到数据库内容，我使用 SimpleCursorAdapter 和以下填充函数:

Hey i use a listview for demonstrate entries which are stored in a database. I also have a EditText element and a button which adds the content of the EditText into the Database. To bind the view to the database content i use the SimpleCursorAdapter and following populate function:

private void populate() {
    cursor = dbAdapter.getAllItems();
    startManagingCursor(cursor);

    String[] from = new String[] { DBAdapter.KEY_TASK };
    int[] to = new int[] { android.R.id.text1 };

    // Now create an array adapter and set it to display using our row
    cursorAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, cursor, from, to);
    list.setAdapter(cursorAdapter);
}

如果我添加了一个新条目，我想通过单击按钮刷新列表视图，但这仅适用于 populate 函数，而不适用于通用适配器函数 notifyDataSetChanged();.我有错误还是刷新列表视图的正确方法?

If i added a new entry, by clicking on the button i want to refresh the listview but this only works with the populate function and not with the common adapter function notifyDataSetChanged();. Do i have a bug or is this the right way to refresh a listview?

推荐答案

你见过 this，尝试了 swap cursor 方法，或者尝试简单地调用 setAdapter() 又来了?

Have you seen this, tried the swap cursor method, or tried just simply calling setAdapter() again?

我遇到了类似的问题，我无法更新我的列表，我所做的只是创建了一个 refreshListView() 方法.现在，您可以从 onCreate() 开始调用它，并且可以在用户向数据库添加内容的任何时候调用它.它所做的只是将列表视图重新绑定到光标.考虑到所有弃用方法 (requery()) 和 notifyDataSetChanged() 问题，我认为这是最简单的方法.

I had a similar issue where I could not get my list to update, and what I did was just create a refreshListView() method. Now you can call this initially from your onCreate(), AND anytime a user adds something to the DB. All it does is re-bind the listview to a cursor. With all the deprecating methods (requery()), and issues with notifyDataSetChanged(), I decided this was the easiest way.

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