java – 将Long(从构造函数)转换为String后过滤ArrayList

public List<DatabaseSource> getListSched() {
 List<DatabaseSource> taskList = new ArrayList<DatabaseSource>();
    // Select All Query
    String selectQuery = "SELECT  * FROM schedTBL" ;
    SQLiteDatabase db = dbHelper.getReadableDatabase();
    Cursor cursor = db.rawQuery(selectQuery,null);
    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
        do {
            DatabaseSource tasks = new DatabaseSource();
            tasks.setId(cursor.getInt(0));
            tasks.setSubject(cursor.getString(1));
            tasks.setDescription(cursor.getString(2));
            tasks.setDueDateTime(cursor.getLong(3));
            // Adding contact to list
            taskList.add(tasks);
        } while (cursor.moveToNext());
    }
    db.close();
    // return contact list
    return taskList;
}

我的构造函数

public DatabaseSource(int id,String subject,String description,Long dueDateTime) {

        this.id = id;
        this.subject = subject;
        this.description = description;
        this.dueDateTime = dueDateTime;
    }

现在,当我尝试将getDueDateTime(Long)中的值转换为字符串的日期时,它可以完全显示为日期和时间.转换后,我想根据日期字符串(来自sharedpref)过滤记录.我的布局流程是,从日历中选择日期后,下一个活动会显示具有相似日期但时间不同的已过滤记录.
这是我在列表视图中显示记录的方式

@Override
public View getView(int position,View convertView,ViewGroup parent) {
    sharedPreference = new SharedPreferenceUID();
    text = sharedPreference.getValue2(mContext);
    String dateString= DateFormat.format("yyyy-MM-dd hh:mm a",new Date(mSchedLists.get(position).getDueDateTime())).toString();
    View v = View.inflate(mContext,R.layout.item_listview,null);
    TextView subj = (TextView)v.findViewById(R.id.txtSubject);
    TextView duedate = (TextView) v.findViewById(R.id.txtDueDateTime);
    subj.setText(mSchedLists.get(position).getSubject());
    duedate.setText(dateString);
    v.setTag( mSchedLists.get(position).getId());
    return v;
}

如您所见,日期和时间已成功转换但显示所有记录,我只想在将其与sharedpref中的保存日期进行比较后显示具有相同日期的记录,而不管时间如何.假设您单击了日历中的日期,并且该日期已保存到sharedpref,并且下一个活动已根据从上一个活动单击的日期过滤了记录.