我从数据库填充listpreference。之后我想从数据库中删除一些行并使用listpreference刷新活动。我想我需要从数据库中选择数据并再次填充lispreference。但我不知道该怎么做。你能帮我个忙吗？这是我的代码。
public class CustomListPreference extends ListPreference {
CustomListPreferenceAdapter customListPreferenceAdapter = null;
...
@Override
protected void onPrepareDialogBuilder(Builder builder)
{
List<String> entries = new ArrayList<String>();
db = dbHelp.getReadableDatabase();
// Here I fill entries from database
customListPreferenceAdapter = new CustomListPreferenceAdapter(mContext);
builder.setAdapter(customListPreferenceAdapter, new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
}
});
}
private class CustomListPreferenceAdapter extends BaseAdapter
{
public CustomListPreferenceAdapter(Context context)
{
}
public void updateResults() {
notifyDataSetChanged();
}
public View getView(final int position, View convertView, ViewGroup parent)
{
// Here I fill my listpreference with elements from entries.
return row;
}
}
public void openDialog(View v){
AlertDialog.Builder builder = new AlertDialog.Builder(Context)
// Dialog to delete row from database. After that I want to refresh activity with listpreference.
.setItems(R.array.edit, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
db = dbHelp.getWritableDatabase();
db.delete("tuser", "name = ?", new String[] { selected_elem });
db.close();
customListPreferenceAdapter.updateResults(); // This doesn't work.
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}