更新適配器數據更改後ListView項目的背景

Question

我有一個列出ListFragment中項目的應用程序。每個項目根據項目狀態具有不同的背景顏色。該適配器從SimpleCursorAdapter分類，因爲這些項目存儲在SQL中。這些項目的編輯發生在不同的片段中。當狀態發生變化時，我使用AsyncTask在GUI線程上觸發適配器上的notifyDataSetChanged（）。但我的清單並未更新。

我知道我在GUI線程上，因爲我覆蓋了notifyDataSetChanged類來檢查。相同的痕跡也告訴我，我正在達到例程。：

@Override 
public void notifyDataSetChanged() { 
    String tag = TAG + ".notifyDataSetChanged()"; 
    Log.d(tag,"DATA SET CHANGE NOTIFICATION!"); 
    if (Looper.getMainLooper().getThread() == Thread.currentThread()) { 
     Log.d(tag,"On GUI thread!"); 
    } else { 
     Log.d(tag,"NOT on GUI thread!"); 
    } 
    super.notifyDataSetChanged(); 
} 

我希望有任何建議。感謝您的時間與興趣。

這裏是整個適配器：

public class OrderListAdapter extends SimpleCursorAdapter { 

    private static final String TAG = "OrderListAdapter"; 
    Context _context = null; 
    int layoutResourceId = 0; 

    /** 
    * Constructor 
    * @param context - Context 
    * @param layout - Layout 
    * @param c - Cursor 
    * @param from - String array with column names 
    * @param to - Int array with destination field ids 
    * @param flags - Integer with flags 
    */ 
    public OrderListAdapter(Context context, int layout, Cursor c, 
      String[] from, int[] to, int flags) { 
     super(context, layout, c, from, to, flags); 
     _context = context; 
    } 

    /** 
    * This override version changes the color of the background of the 
    * row based on the order status. 
    */ 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View view = super.getView(position, convertView, parent); 

     if (view == null) { 
      LayoutInflater inflater = ((Activity)_context).getLayoutInflater(); 
      view = inflater.inflate(R.layout.fragment_order_list_row, null); 
     } 
     setRowColor(view); 
     return view; 
    } 

    private void setRowColor(View view) { 
     Cursor cursor = getCursor(); 
     int col = cursor 
       .getColumnIndex(DBContract.DeliveryOrderTable.ENROUTE_FLAG); 
     String enroute_flag = cursor.getString(col); 
     col = cursor 
       .getColumnIndex(DBContract.DeliveryOrderTable.DELIVERED_DATETIME); 
     String deliveredDateStr = cursor.getString(col); 
     int bgColorId = 0; 
     if (!deliveredDateStr.equals("")) { 
      bgColorId = R.color.bg_status_delivered_color; 
     } else if (enroute_flag.startsWith("t") || enroute_flag.startsWith("y")) { 
      bgColorId = R.color.bg_status_enroute_color; 
     } else { 
      bgColorId = R.color.bg_status_assigned_color; 
     } 
     view.setBackgroundColor(_context.getResources().getColor(bgColorId)); 

    } // setRowColor() 

    ///// DEBUG 

    @Override 
    public void notifyDataSetChanged() { 
     String tag = TAG + ".notifyDataSetChanged()"; 
     Log.d(tag,"DATA SET CHANGE NOTIFICATION!"); 
     if (Looper.getMainLooper().getThread() == Thread.currentThread()) { 
      Log.d(tag,"On GUI thread!"); 
     } else { 
      Log.d(tag,"NOT on GUI thread!"); 
     } 
     super.notifyDataSetChanged(); 
    } 

} // class 

Answer 1

必須更新使用數據adapter.changeCursor更改時光標。看到這個答案：https://stackoverflow.com/a/1986071/198996