如何在自定义适配器中调用notificationdatasetchanged()后更新OnStart()中的变量

   private List<Data> mDataList;

   private OnDataChangedListener mListener;

   // ...

   public void setOnDataChangedListener(OnDataChangedListener listener) {

       mListener = listener;

   }

   // ...

   private void onDataChange() {

       if (mListener != null) {

           mListener.onDataChanged();

       }

   }

   // ...

   private int mVariable;

   // ...

   @Override

   protected void onStart() {

       super.onStart();

       // 初始化变量

       CustomAdapter adapter = new CustomAdapter();

       adapter.setOnDataChangedListener(this);

       // ...

   }

   @Override

   public void onDataChanged() {

       // 更新变量

       mVariable = newValue;

   }

   // ...