notifyDataSetChanged不會被觸發，即使我調用了兩次

Question

我知道數據被插入到數據庫中，並且它已正確列出，但notifydatasetchanges不起作用，列表視圖不會刷新，所以我必須重新啓動我的活動....

Cursor c = db.selectAll(); 
      final ListView lv = (ListView) findViewById(R.id.listView1); 
      adapter=new MyContactsAdapter(this, c); 
      lv.setAdapter(adapter); 
      db.insertInTable("asd","asd"); 
      //insertion in table works, I am sure, cause when I start the activity the new values are listed 

    //this the part that doesn't works 
     ((MyContactsAdapter)lll.getAdapter()).notifyDataSetChanged(); 
        adapter.notifyDataSetChanged(); 
        lll.refreshDrawableState(); 





    private class MyContactsAdapter extends CursorAdapter{ 
      private Cursor mCursor; 
      private Context mContext; 
      private final LayoutInflater mInflater; 

      public MyContactsAdapter(Context context, Cursor cursor) { 
       super(context, cursor, true); 
       mInflater = LayoutInflater.from(context); 
       mContext = context; 
      } 

      @Override 
      public void bindView(View view, Context context, Cursor cursor) { 
       TextView t = (TextView) view.findViewById(R.id.textView2); 
       t.setText(cursor.getString(0)); 

       t = (TextView) view.findViewById(R.id.TextView01); 
       t.setText(cursor.getString(1)); 

      } 

      @Override 
      public View newView(Context context, Cursor cursor, ViewGroup parent) { 
       final View view = mInflater.inflate(R.layout.item, parent, false); 
       return view; 
      } 
     }//adapter 

Answer 1

好吧，有點像，從你的代碼，

Cursor c; 
     @Override 
     onCreate(.... {  

     setContentView(...); 
     final ListView lv = (ListView) findViewById(R.id.listView1); 
     db.insertInTable("asd","asd"); 
     c = db.selectAll(); 
     adapter=new MyContactsAdapter(this, c); 
     lv.setAdapter(adapter); 

     // some button click... 
     button.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 

      db.insertInTable("xyz","xyz"); 
         c = db.selectAll(); 

      adapter.notifyDataSetChanged(); 
      } 
     }); 

試試這個，讓我們看看會發生什麼......