我有这样的 SQLite 数据库表:
_id || Column1 || Column2 ||
1 || test1 || a,b,c,d,e,f ||
2 || test2 || g,h,i,j,k,l ||
3 || test3 || m,n,o,p,q,r ||
如何从此表中随机选择一个 Column2?
我想要这样的结果:
_id || Column1 || Column2 ||
1 || test1 || d ||
2 || test2 || k ||
3 || test3 || r ||
假设 d, k, r 是每条记录的 Column2 的随机值。
谢谢
更新:我创建了 CustomAdapter 并添加了一些这样的视图:
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
Cursor c = getCursor();
final LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(layout, parent, false);
int column2Name= c.getColumnIndex(DBAdapter.COLUMN2);
String col2Name= c.getString(column2Name);
String[] temp;
Random random = new Random();
temp = col2Name.split(",");
String col2 = temp[random.nextInt(temp.length)];
TextView col2_name = (TextView) v.findViewById(R.id.column2_label);
if (col2_name != null) {
col2_name .setText(col2);
}
return v;
}
@Override
public void bindView(View v, Context context, Cursor c) {
int column2Name= c.getColumnIndex(DBAdapter.COLUMN2);
String col2Name= c.getString(column2Name);
String[] temp;
Random random = new Random();
temp = col2Name.split(",");
String col2 = temp[random.nextInt(temp.length)];
TextView col2_name = (TextView) v.findViewById(R.id.column2_label);
if (col2_name != null) {
col2_name .setText(col2);
}
}
现在,只需在您的活动上使用该 customAdapter,以便 column2 可以显示为 1 个随机值。