问在Android2.2上未调用SimpleCursorTreeAdapter构造函数

EN

public class ExpListCursorAdapter extends SimpleCursorTreeAdapter {
    Context mContext;

    public ExpListCursorAdapter(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);
        mContext=context;
}

    @Override
    protected Cursor getChildrenCursor(Cursor groupCursor) {
        int id=groupCursor.getInt(DatabasePazienti.ROWID);
        DatabaseTests mDbTests=new DatabaseTests(mContext);
        mDbTests.open();

        Cursor cursor=mDbTests.fetchPatientTests(id);
        return cursor;
    }