How to save cursor in activity?

I'm population my listView using Cursor, but when I nav开发者_运维百科igate away from my activity and then return back my listview is empty. Here is my code:

@Override
public void onCreate(Bundle savedInstanceState) {

...

DBAdapter db = new DBAdapter(context);
db.open();
Cursor c = db.getAll();
db.close();

startManagingCursor(c);
String[] columns = new String[] { ... };
int[] to = new int[] { ... };
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, R.layout.list_item, c, columns, to);
this.setListAdapter(mAdapter);

...

}

I've seen here questions about saving position of Cursor, but not the Cursor itself. Probably I just missing something, shall I save my cursor (how can I do it?) or it's better(faster, cheaper) to create new cursor every time using my DBadapter?

Thanks

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startManagingCursor() makes your close() call unnecessary. As long as you didnt get exceptions about not finalizing or closing your cursor you have done anything right.