在Android android-sqlite中，Days只能获得过去7天的数据

Question

我创建了一个使用Sqlite数据库的应用程序。我想显示从今天到过去7天的数据。不应选择上面的数据。所以为此，我写了一个查询，但它似乎没有起作用。在列表中，我收到了过去7天以上的数据

代码

public ArrayList<DbModel> getRecentDocs() {
        database = getWritableDatabase();
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

        Date date = new Date();
        String todate = dateFormat.format(date);

        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.DATE, -7);
        Date todate1 = cal.getTime();
        String fromdate = dateFormat.format(todate1);
        alGetRecentFiles = new ArrayList<DbModel>();
        dbModel = new DbModel();
        String query = "Select * From " + saveFileTable + " where " + postedOn + " >= " + fromdate;
        Cursor c = database.rawQuery(query, null);
        while (c.moveToNext()) {
            dbModel = new DbModel(c.getString(c.getColumnIndexOrThrow(userId)), c.getString(c.getColumnIndexOrThrow(docId)), c.getString(c.getColumnIndexOrThrow(fileName)), c.getString(c.getColumnIndexOrThrow(fileExt)), c.getString(c.getColumnIndexOrThrow(title)), c.getString(c.getColumnIndexOrThrow(filePath)), c.getString(c.getColumnIndexOrThrow(postedOn)), c.getString(c.getColumnIndexOrThrow(favourite)));
            alGetRecentFiles.add(dbModel);
        }
        c.close();
        database.close();
        return alGetRecentFiles;
    }