Android遊標循環遍歷欄

Question

我試圖改變名爲「日期」的列中的每個值。這基本上是需要循環通過專欄，並將每個條目更改爲最新的日期差異。問題是，我的代碼不斷改變一切到相同的價值。所以基本上，即使每個條目的「剩餘天數」應該是不同的，但這一切都歸結爲相同的數字。這是我的代碼。

String[] projection = { HabitTable.COLUMN_ENDDATE, HabitTable.COLUMN_ID }; 
     //Get end date from database 
     Cursor mCursor = getContentResolver().query(MyHabitContentProvider.CONTENT_URI, projection, 
       null, null, null); 
     //Store end date in array 
     if(mCursor != null){ 
      do{ 
       endDate = mCursor.getString(mCursor.getColumnIndexOrThrow(HabitTable.COLUMN_ENDDATE)); 

       //Whole bunch of code to calculate days left 
       String[] eDate = endDate.split("-"); 
       int eDay = Integer.parseInt(eDate[0]); 
       int eMonth = Integer.parseInt(eDate[1]); 
       eMonth--; 
       int eYear = Integer.parseInt(eDate[2]); 
       Calendar cNow = Calendar.getInstance(); 
       Calendar cEnd = Calendar.getInstance(); 
       cEnd.set(Calendar.DAY_OF_MONTH, eDay); 
       cEnd.set(Calendar.MONTH, eMonth); 
       cEnd.set(Calendar.YEAR, eYear); 
       long diff = cEnd.getTimeInMillis() - cNow.getTimeInMillis(); 
       long days = diff/(24 * 60 * 60 * 1000); 
       if(days <= 0){ 
        days = 0; 
       } 

       String y = String.valueOf(days); 

       ContentValues values = new ContentValues(); 
       values.put(HabitTable.COLUMN_DAYSLEFT, y); 
       getContentResolver().update(MyHabitContentProvider.CONTENT_URI,values, null, null); 
      }while(mCursor.moveToNext()); 
     }mCursor.close(); 

我有沒有犯過很大的錯誤，我沒有發現？

Answer 1

我認爲烏拉圭回合缺少的是更新

嘗試這樣

ContentValues values = new ContentValues(); 
values.put(HabitTable.COLUMN_DAYSLEFT, y); 
// Apply condition here 
String where = HabitTable.COLUMN_ID+"="+mCursor.getString(mCursor.getColumnIndexOrThrow(HabitTable.COLUMN_ID)); 
getContentResolver().update(MyHabitContentProvider.CONTENT_URI,values, where , null); 

here ID是一個很好的例子..