Question

For a listView, when you register an OnItemClickListener, the method you specify looks like this:

public abstract void onItemClick (AdapterView parent, View view, int position, long id)

The id corresponds to the row that the user clicked on. My question is simply why is it a long and not an int? When would you use it as a long? I’ve been casting it to an int when I use it, so it makes me think that maybe I’m using it wrong.

Answer 1

I think this comes to us straight from SQLite:

In SQLite, every row of every table
has an 64-bit signed integer ROWID.
The ROWID for each row is unique among
all rows in the same table.

Given that, it seems natural that the Android APIs would specify 64 bits for the ID for a database row.