Android使用光标填充listview

Question

My app uses a simple SQLite database. Everything works fine I can now present a Toast with a chosen row from the return query using:

{
    //etc etc etc...

    c.movetofirst();
    DisplayTitle(c);
}
public void DisplayTitle(Cursor c)
{
    Toast.makeText(main.this, 
            "id: " + c.getString(0) + "\n" +
            "reg: " + c.getString(1) + "\n" +
            "type: " + c.getString(2) + "\n",
            Toast.LENGTH_LONG).show();        
}

I want to prsent all the data in the cursor to the screen using a view but I am not sure how to go about this. Which view should I use? I just wnt a simple looking grid representation which allows me to scroll through each row in the cursor

Thanks in advance.

Answer 1

How can I show ALL rows in the Cursor?

There are several ways if you are working with a Cursor , for example see the "moveTo" related methods, here's an example:

Set<Item> items = new HashSet<Item>(c.getCount());
if (c.moveToFirst()) {
            do {
               Item i = new Item(select(c.getString(0), c.getString(1), c.getString(2));
               set.add(i);
            } while (c.moveToNext());
         }
         if (!c.isClosed()) {
            c.close();
         }

This assumes Item is a data class that has a constructor with three String parameters. Going with your code, id, reg, and type. Usually column 0 will be a numeric ID (not getString, but SQLite uses "manifest typing" so it will sort of dyna-type a String/Long from column 0 -- you may want to AUTOINCREMENT and use getLong there though).

One you have a collection of items, you can do anything you want with them to display them. If you want a scrolling/selectable list, then ListView is an excellent choice. And, you can back it with a CursorAdapter .

Here's an example of a ListView that is populated by a CursorAdapter from an open source project: http://code.google.com/p/and-bookworm/source/browse/trunk/src/com/totsp/bookworm/Main.java (see the inner BookCursorAdapter class, it should get you pointed in the right direction).