Android how do you code now if requery is deprecat

问题:

as per the topic. If we used to call cursor.requery(), but it is now deprecated, how do you call this function now?

"This method is deprecated. Don't use this. Just request a new cursor, so you can do this asynchronously and update your list view once the new cursor comes back."

So how does one request a new cursor and pass it back to the adapter?

回答1:

again re-initialize cursor when your any DML query execute, can refer this

回答2:

Just think about a block where you need to use cursor again and again. Populate it with the query. Work with it and then close before reusing

{
    Cursor c =//Populating cursor again
    while (c.moveToNext()) {
    }
    if (c != null) c.close();
}

回答3:

Use a Loader to manage your cursors. It will return a new Cursor as needed and you can use swapCursor() on the adapter to refresh the data.

回答4:

I used ListAdapter.notifyDataSetChanged(); this worked only on list (like ArrayList), when the listcontent changed. Using databaseoutput, it doesn't work anymore. Therefore I took cursor.requery(); which is not only depricated. It also works only, if database entries changed.

But now, I want to change my view (switch between birthdays and dates) by changing my settings in a database, so requery does not recognize it.

For all changes works (a little bit dirty): this.onCreate(null);