onListItemClick,获取值需要什么语句？

Question

我可以添加到数据库并列表作为列表视图.当我使用onListItemClick单击列表项时,我需要什么语句来获取值？

提前致谢.

public class Main extends ListActivity {
private static String[] FROM = { _ID, DESCRIPTION, UN };
private static String ORDER_BY = DESCRIPTION + " ASC";
private static int[] TO = {R.id.itemrowid, R.id.itemdescription, R.id.itemun };
private EventsData events;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    events = new EventsData(this);
    try {
        Cursor cursor = getEvents();
        showEvents(cursor);
     } finally {
        events.close();
     }

**public void onListItemClick(ListView parent, View v, int position, long id) {
    // What statement to put here to get the value of _ID,DESCRIPTION, UN
    // selected**?
}

private Cursor getEvents() {
    // Perform a managed query. The Activity will handle closing
    // and re-querying the cursor when needed.
    SQLiteDatabase db = events.getReadableDatabase();
    Cursor cursor = db.query(TABLE_NAME, FROM, null, null, null,
            null, ORDER_BY);
    startManagingCursor(cursor);
    return cursor;
}

private void showEvents(Cursor cursor) {
    // Set up data binding
    SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
            R.layout.item, cursor, FROM, TO);
    setListAdapter(adapter);
}

Answer 1

首先,您需要在点击位置获取项目:

Cursor cursor = getListAdapter().getItem(position);

然后你可以从这个光标获取数据(我不知道你使用什么类型,所以只是例如它将是int和String):

int id = cursor.getInt(cursor.getColumnIndex(_ID));
String description = cursor.getString(cursor.getColumnIndex(DESCRIPTION));

请参阅Cursor可用方法的文档.