如何刪除所有視圖並重新添加？

Question

我正在創建視圖來顯示事件。我正在從數據庫檢索記錄並根據記錄顯示事件。事件現在正在創建。

現在我想刪除記錄時刪除視圖。現在，如果我刪除了該記錄，那麼也會在片段中創建視圖。

我添加事件活動，我添加和刪除記錄。記錄在數據庫中被刪除，但我完成後仍能看到視圖（）;活動。

創建視圖：

private void createEvent(LayoutInflater inflater, ViewGroup dayplanView, int fromMinutes, int toMinutes, String title,String location,final int id) { 

    final View eventView = inflater.inflate(R.layout.event_view, dayplanView, false); 
    RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) eventView.getLayoutParams(); 

    container = (RelativeLayout) eventView.findViewById(R.id.container); 
    TextView tvTitle = (TextView) eventView.findViewById(R.id.textViewTitle); 


    if (tvTitle.getParent() != null) 
     ((ViewGroup) tvTitle.getParent()).removeView(tvTitle); 

    if(location.equals("")) 
    { 
     tvTitle.setText("Event : " + title); 

    } 
    else 
    { 
     tvTitle.setText("Event : " + title + " (At : " + location +")"); 
    } 

    int distance = (toMinutes - fromMinutes); 
    layoutParams.topMargin = dpToPixels(fromMinutes + 9); 
    layoutParams.height = dpToPixels(distance); 

    eventView.setLayoutParams(layoutParams); 
    dayplanView.addView(eventView); 
    container.addView(tvTitle); 

    // eventView.setTag(tag); 
    eventView.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      i = new Intent(getActivity(), AddEventActivity.class); 
      editMode = true; 
      i.putExtra("EditMode", editMode); 
      int tag = 0; 
      // tag =(int)v.getTag(); 
      // i.putExtra("tag",tag); 
      // EventData e =new EventData(); 
      // int id=0;/ id = e.getId(); 
      i.putExtra("id", id); 
      startActivityForResult(i, 1); 

     } 
    }); 
} 

@Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    removeView(); 
    showEvents(); 
} 

public void showEvents() 
{ 
    mDb = new EventTableHelper(getActivity()); 
    events = mDb.getAllEvents("Mon"); 

    int tag = 0; 

    for (EventData eventData : events) { 

     int id = eventData.getId(); 

     String datefrom = eventData.getFromDate(); 

     if (datefrom != null) { 

      String[] times = datefrom.substring(11, 16).split(":"); 
      minutesFrom = Integer.parseInt(times[0]) * 60 + Integer.parseInt(times[1]); 
     } 
     String title = eventData.getTitle(); 
     String location = eventData.getLocation(); 

     String dateTo = eventData.getToDate(); 

     if (dateTo != null) { 
      //times = dateTo.substring(11,16).split(":"); 
      String[] times1 = dateTo.substring(11, 16).split(":"); 
      minutesTo = Integer.parseInt(times1[0]) * 60 + Integer.parseInt(times1[1]); 
     } 
     createEvent(inflater, dayplanView, minutesFrom, minutesTo, title, location, id); 
     tag++; 
     id++; 
    } 

} 

試圖刪除視圖：

public void removeView() 
{ 
    ArrayList<View> list = new ArrayList<View>(); 

    for(int i=0; i<list.size(); i++) 
    { 
     dayplanView.removeAllViews(); 
    } 
} 

dayplanview是ViewGroup

dayplanView = (ViewGroup) view.findViewById(R.id.hoursRelativeLayout); 

我仍然可以看到該視圖。請問怎麼回事？

編輯：

例外：

了java.lang.RuntimeException：失敗遞送結果ResultInfo {誰= NULL，請求= 131073，結果= -1，數據=意向{CMP = com。示例。 siddhi.timetablelayout/.AddEventActivity（has extras）}} to activity {com.example.siddhi.timetablelayout/com.example.siddhi.timetablelayout.MainActivity}：java.lang.NullPointerException：試圖調用虛方法'void android.widget .RelativeLayout.removeAllViews（）'null對象引用 02-05 08：02：37.871 29485-29485/com.example.siddhi.timetablelayout E/AndroidRuntime：at android.app.ActivityThread.deliverResults（ActivityThread.java:35 74）

at：parent.removeAllViews（）;

Answer 1

你不需要做dayplanView.removeAllViews（）;在for循環中。從你的代碼看起來，因爲列表的大小爲0，所以甚至沒有輸入for循環。這就是你需要的全部內容：

public void removeView() 
{ 
    dayplanView.removeAllViews(); 
}