從列表視圖與HashMap創建ArrayList重複，而不是添加

Question

所以，我有一個由JSON解析創建的ListView，我希望一旦從ListView中選擇一個項目被添加到另一個ArrayList，在那裏我使用HashMap，因爲它是一個數據包。問題是，如果我選擇一個它可以正常工作，但是一旦我選擇第二個，那麼我的ArrayList將會有第二個兩次，如果我再次執行第三個三等等。我附上下面的代碼部分，任何幫助將不勝感激。

lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

       public void onItemClick(AdapterView<?> adapter, View v, int position, long id) { 

        Toast.makeText(getApplicationContext(), 
          "Bookmarked", 
          Toast.LENGTH_LONG) 
          .show(); 


//adding the data from the list view to the HashMap object 

        HashMap<String, String> obj = (HashMap<String, String>) adapter.getItemAtPosition(position); 
        String name = (String) obj.get("name"); 
        String rating = (String) obj.get("rating"); 
        String summary = (String) obj.get("summary"); 
        String date = (String) obj.get("publ. date"); 
        String type = (String) obj.get("type"); 
        String suggested_link = (String) obj.get("suggested_link_text"); 
        String link = (String) obj.get("link"); 


        bookmarked.put("rating", rating); 
        bookmarked.put("name", name); 
        bookmarked.put("summary", summary); 
        bookmarked.put("publ. date", date); 
        bookmarked.put("type", type); 
        bookmarked.put("suggested_link_text", suggested_link); 
        bookmarked.put("link", link); 


//the ArrayList that contains the HashMap data 
        selected.add(bookmarked); 

        Log.v("Selected: ", selected.toString()); 

       }}); 

Answer 1

那是因爲你覆蓋的每次點擊的bookmarked對象，你每次添加此相同的對象添加到列表。 該解決方案是創建一個新的bookmarked對象每次：

HashMap<String, String> bookmarked = new HashMap<String, String>(); 
bookmarked.put("rating", rating); 
       bookmarked.put("name", name); 
       bookmarked.put("summary", summary); 
       bookmarked.put("publ. date", date); 
       bookmarked.put("type", type); 
       bookmarked.put("suggested_link_text", suggested_link); 
       bookmarked.put("link", link);