android - 在 ListView 中更新或更改适配器

Question

我对 ListView 有疑问，请看我下面的代码

private void set_adapter() {

    Cursor list_scan_curson = scan_result.getScanResult();
    List<String> list_scan = new ArrayList<String>();
    try {

        if (list_scan_curson.moveToFirst()) {
            do {

                String name = list_scan_curson.getString(0);

                // Adding contact to list
                list_scan.add(name);
            } while (list_scan_curson.moveToNext());
        }

        ArrayAdapter<String> list_item_scan = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, list_scan);
        this.list_scan.setAdapter(list_item_scan);

    } catch (Exception e) {

    }

}

现在我想在我的数据库更新时更改或更新适配器，并且基于该 ListView 将更新所以任何伙伴都可以告诉我如何执行此操作

Answer 1

你创建一个新的游标，并替换旧的，像这样:

Private ArrayAdapter<String> mAdapter; // adapter declared as field
...
mAdapter =  ..., // create adapter
...
mAdapter.notifyDataSetChanged(); // update listview