更新ListView控件從數據庫的Android

Question

刪除從數據庫中我的ListView不更新刪除後，我發現在計算器由它不工作的方法，這裏是我如何填充我的列表：

... 
private ListView list; 
ListAdapter adapter; (ListAdapter is a class from here i set the layout of a row) 
... 
... 

protected void onCreate(Bundle savedInstanceState) { 
    ... 
    ... 
     database info = new database(this); 
    info.open(); 
    data = info.getData2(); 
    data2 = info.getData3(); 
    info.close(); 
    list=(ListView)findViewById(R.id.list); 
    adapter=new ListAdapter(this, data , data2); 
    list.setAdapter(adapter); 
     registerForContextMenu(list); 
     ... 
     ... 
} 

... 
... 
public boolean onContextItemSelected(MenuItem item) { 
    AdapterView.AdapterContextMenuInfo info =(AdapterView.AdapterContextMenuInfo)item.getMenuInfo(); 
     ... 
     ... 
     if(menuItemName.equals("Delete")){ 
     menuItemName = "2"; 
     Log.i(TAG,"Primul "+listItemName + " " + " al doilea " + listItemName2); 
     database delete = new database(this); 
     delete.open();   
    delete.deleteEntryFromList(listItemName,listItemName2); 
    delete.close(); 
     //here i am suposed to do 
      adapter.notifyDataSetChanged(); 
     //but it does not work 
     } 
} 

能

有人幫助我在這 ？

Answer 1

我一直有與通知方法的問題。最簡單的辦法：創建一個名爲updateAdapter（）方法，更換的通知電話，把這個在它：

private void updateAdapter(){ 
    database info = new database(this); 
    info.open(); 
    data = info.getData2(); 
    data2 = info.getData3(); 
    info.close(); 
    list=(ListView)findViewById(R.id.list); 
    adapter=new ListAdapter(this, data , data2); 
    list.setAdapter(adapter); 
     registerForContextMenu(list); 
} 

調用，而不是通知*方法。

Answer 2

您需要更新您在varibals data = info.getData2（）中的數據;和 data2 = info.getData3（）;那你說adapter.notifiDataSetChanged，它會更新列表視圖的youre

編輯 bettter的answere

database delete = new database(this); 
    delete.open();   
delete.deleteEntryFromList(listItemName,listItemName2); 
delete.close(); 
    database info = new database(this); 
info.open(); 
data = info.getData2(); 
data2 = info.getData3(); 
info.close(); 
adapter.notifyDataSetChanged();