Adapter報錯：The content of the adapter has changed的解決

阿新 • • 發佈：2019-01-19

The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread。
從DDMS中的log也無法定位到準確的出錯位置，後來仔細檢查下發現，自己在後臺的Background thread中直接呼叫adapter的notifyDataSetChanged()造成的。從網上查詢資料需要將相關程式碼到Handler中處理，即解決此問題。
Handler的定義：

主要接受子執行緒傳送的資料，並用此資料配合主執行緒更新UI。當應用程式啟動時，Android首先會開啟一個主執行緒 (也就是UI執行緒)，主執行緒為管理介面中的UI控制元件，進行事件分發，比如說，你要是點選一個 Button，Android會分發事件到Button上，來響應你的操作。如果此時需要一個耗時的操作，例如，聯網讀取資料，或者讀取本地較大的一個檔案的時候，你不能把這些操作放在主執行緒中，如果你放在主執行緒中的話，介面會出現假死現象，如果5秒鐘還沒有完成的話，會收到Android系統的一個錯誤提示 "強制關閉"。這個時候我們需要把這些耗時的操作，放在一個子執行緒中，因為子執行緒涉及到UI更新，Android主執行緒是執行緒不安全的，也就是說，更新UI只能在主執行緒中更新，子執行緒中操作是危險的。這個時候，Handler就出現了來解決這個複雜的問題，由於Handler執行在主執行緒中(UI執行緒中)，它與子執行緒可以通過Message物件來傳遞資料，這個時候，Handler就承擔著接受子執行緒傳過來的(子執行緒用sedMessage()方法傳弟)Message物件，(裡面包含資料) ，把這些訊息放入主執行緒佇列中，配合主執行緒進行更新UI。

繼承Handler的子類：
//Handler類
   private class MyHandler extends Handler{
       public MyHandler(){

       }
       public MyHandler(Looper L){
           super(L);
       }
       //子類重寫此方法
       @Override
       public void handleMessage(Message msg){
           super.handleMessage(msg);
           //此處更新UI
           if(msg.what==1){
               MyAdapter adapter = new MyAdapter();
               adapter.notifyDataSetChanged();
               listView.setAdapter(adapter);
           }

       }
   }

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