我遇到了ExpandableListView问题。我想要的是每个组都来自列“bond”,这是非唯一的,但我希望这些组是唯一的(即每个“bond”的值应该只有一个组)。组中的每个值都应显示其他列中的数据。问题是,我似乎可以对一列使用SQL DISTINCT运算符(然后getChildrenCursor()抛出IllegalStateException),或者不使用DISTINCT运算符并使每个组都重复。Android中的不同值ExpandableListView
任何人都可以提出一个解决这个问题吗?
public void onCreate(Bundle saved) {
super.onCreate(saved);
DatabaseHelper dh = new DatabaseHelper(this);
dh.openDataBase();
db = dh.getReadableDatabase();
String query = "SELECT DISTINCT bond FROM spectro";
Cursor c = db.rawQuery(query, null); //throws exception when group opened
//Cursor c = db.query("spectro", new String[] { "_id", "name", "bond", ir },
//null, null, null, null, null) - gives duplicate groups
ExpandableListAdapter a = new IRCursorAdapter (this,
c, android.R.layout.simple_expandable_list_item_1, new String[] { "bond" },
new int[] { android.R.id.text1 }, R.layout.row_doubleend,
new String[] { "name", "ir" }, new int[] { R.id.double_item1, R.id.double_item2 });
this.setListAdapter(a);
}
protected class IRCursorAdapter extends SimpleCursorTreeAdapter {
public IRCursorAdapter(Context context, Cursor cursor, int groupLayout,
String[] groupFrom, int[] groupTo, int childLayout,
String[] childFrom, int[] childTo) {
super(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childFrom,
childTo);
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor) {
Cursor c = db.query("spectro", new String[] {"_id", "name", "bond", "ir"},
"bond=?", new String[] { groupCursor.getString(0) }, null, null, null);
startManagingCursor(c);
return c;
}
};
这里是我的表看起来什么喜欢 - 债券是什么,我想是唯一的:
_id |名称| bond | ir
1 |名字1 | bond 1 | ir 1
2 |名称2 | bond 1 | ir 2
3 |名字3 | bond 2 | ir 3
4 |名字4 | bond 3 | ir 4
对不起,如果这不是特别清楚,但感谢您的帮助!
是的,在查询中使用了该组并且完美地工作 – 2011-05-18 13:49:49