使用viewpager同時更新多個相同數據的列表

我正在構建一個應用程序，它將用戶輸入的開銷存儲到SQLite數據庫中，並將它們顯示在RecyclerView中。我的應用程序目前有一個帶3個選項卡的視圖分頁器。每個選項卡切換到一個新的片段，該片段從SQLite數據庫中獲取來自不同時間段的費用，特別是「今日，本週」和所有顯示在RecyclerView中的費用。在每個列表中，我可以長按一個項目並刪除它，它將從SQLite數據庫和當前的RecyclerView中刪除它並更新列表。因爲有可能一個列表中的項目會出現在其他列表中，所以我想實現一種方法，以便我可以檢查其他兩個片段中的列表，以便刪除任何項目，並將其從中刪除，但我有難以找出最好的方法來做到這一點。使用viewpager同時更新多個相同數據的列表

現在，我可以很容易地認爲尋呼機重建每一個將再次調用數據庫，並創造全新的列表片段，但這是低效的。有沒有人對我如何實現這一目標有任何想法？下面是我當前的代碼：

ExpensePagerAdapter

class ExpensePagerAdapter extends FragmentPagerAdapter { 
    private String[] tabTitles = {getString(R.string.label_today), 
      getString(R.string.label_week), getString(R.string.label_all)}; 


    ExpensePagerAdapter(FragmentManager fm){ 
     super(fm); 
    } 

    @Override 
    public int getCount() { 
     return tabTitles.length; 
    } 

    @Override 
    public Fragment getItem(int position) { 
     return ExpenseListFragment.newInstance(position); 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return tabTitles[position]; 
    } 

}

ExpenseListFragment

public class ExpenseListFragment extends Fragment{ 
private static final String LOG_TAG = "ExpenseListFragment"; 
private static final String ARG_TYPE = "viewType"; 
private RecyclerView rv; 
private List<Expense> dayViewExpenses; 
private List<LocalDate> weekViewDay; 
private List<List<Expense>> weekViewExpenses; 
private List<Expense> allExpenses; 

public static ExpenseListFragment newInstance(int viewType){ 
    Bundle bundle = new Bundle(); 
    bundle.putInt(ARG_TYPE, viewType); 
    ExpenseListFragment f = new ExpenseListFragment(); 
    f.setArguments(bundle); 
    return f; 
} 

@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    Log.d(LOG_TAG, "onCreateView"); 
    View v = inflater.inflate(R.layout.fragment_list, container, false); 
    rv = (RecyclerView) v.findViewById(R.id.rv_list); 
    rv.setLayoutManager(new LinearLayoutManager(getActivity())); 
    int viewType = getArguments().getInt(ARG_TYPE); 
    switch(viewType) { 
     case 0: 
      setupDayView(); 
      break; 
     case 1: 
      setupWeekView(); 
      break; 
     case 2: 
      setUpAllView(); 
      break; 
     default: 
    } 
    return v; 
} 

private void setupDayView(){ 
    dayViewExpenses = new ArrayList<>(); 
    LocalDate currentDate = new LocalDate(); 
    for (Expense e : ExpenseDb.getInstance(getActivity()).getAllExpenses()) { 
     if (currentDate.getMonthOfYear() == e.getMonth() 
       && currentDate.getDayOfMonth() == e.getDay() && currentDate.getYear() == e.getYear()) { 
      dayViewExpenses.add(e); 
     } 
    } 
    rv.setAdapter(new ExpenseAdapter(getActivity(), dayViewExpenses)); 
} 

private void setupWeekView(){ 
    weekViewDay = new ArrayList<>(); 
    weekViewExpenses = new ArrayList<>(); 
    LocalDate weekStart = new LocalDate().withDayOfWeek(DateTimeConstants.MONDAY); 
    for (int i = 0; i < 7; i++) { 
     LocalDate dayOfWeek = weekStart.plusDays(i); 
     weekViewDay.add(dayOfWeek); 
     List<Expense> expensesForDay = new ArrayList<>(); 
     for (Expense expense: ExpenseDb.getInstance(getActivity()).getAllExpenses()) { 
      if (expense.getDay() == dayOfWeek.getDayOfMonth() && expense.getMonth() == dayOfWeek.getMonthOfYear() 
        && expense.getYear() == dayOfWeek.getYear()) { 
       expensesForDay.add(expense); 
      } 
     } 
     weekViewExpenses.add(expensesForDay); 
    } 
    rv.setAdapter(new WeekViewAdapter(getActivity(), weekViewDay, weekViewExpenses)); 
} 

private void setUpAllView(){ 
    allExpenses = ExpenseDb.getInstance(getActivity()).getAllExpenses(); 
    rv.setAdapter(new ExpenseAdapter(getActivity(), allExpenses)); 
}

}

任何幫助將是巨大的，因爲我一直在努力找出一種理想的方式來完成這個。

來源

2017-02-15 BroccolliBeef