重新启动应用程序后，不会保存ListView中的更新

Question

我的申请包含2项活动。 第一个包含一个列表，从中我逐行向第二个活动发送行：http://postimg.org/image/5pmlso0ct/ 第二个活动（我添加了一些行）：http://postimg.org/image/sr9zvqp2d/

当我关闭应用程序并再次启动时出现我的问题，在第二个活动中，我只获得了第一个活动发送的最后一行： http://postimg.org/image/7tuu2ptdl/ 我还尝试创建另一个类来保存填充listview的arraylist，但它似乎不起作用我想

〜第一次活动〜

 @Override
public boolean onItemLongClick(AdapterView<?> arg0, View view,
                               int position, long arg3) {
    SharedPreferences sp = context.getSharedPreferences("Save",
            Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sp.edit();
    textView4 = (TextView)view.findViewById(R.id.titleTextView);
    textView5 = (TextView)view.findViewById(R.id.userNameTextView);
    n =textView4.getText().toString();
    m=textView5.getText().toString();
    MyObject=new CustomObject(n,m);




    Gson gson = new Gson();
    String json = gson.toJson(MyObject);
    editor.putString("MyObject", json);
    editor.apply();

〜第二次活动〜

   public class Favorites extends Activity{
   private ListView lv;
  private String n, m;
  private CustomObject obj;
  private SaveData save;
  SharedPreferences sharedpreferences;

List<CustomObject> favorites=new ArrayList<>();



protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_favorites);
    lv = (ListView) findViewById(R.id.forthlistview);



    sharedpreferences = getSharedPreferences("Save",
            Context.MODE_PRIVATE);


}


private void fillFavoriteList() {
    Gson gson = new Gson();
    String json = sharedpreferences.getString("MyObject", "");
    obj = gson.fromJson(json, CustomObject.class);
    favorites.add(obj);
    HashSet<CustomObject> hs = new HashSet<CustomObject>();
    hs.addAll(favorites);
    favorites.clear();
    favorites.addAll(hs);
    save.setGlobalArrayOfCustomObjects(favorites);

            adapter = new AdapterFavorites(Favorites.this, favorites);
            lv.setAdapter(adapter);

}




protected void onResume() {
    super.onResume();
  if(favorites==null)
  {favorites=save.getGlobalArrayOfCustomObjects(); fillFavoriteList();}
else fillFavoriteList();

    }

 }

~SaveData类〜

   public class SaveData extends Favorites {



      private List<CustomObject> globalArray;

       public void setGlobalArrayOfCustomObjects(List<CustomObject> newArray){
       globalArray = newArray;
   }

    public List<CustomObject> getGlobalArrayOfCustomObjects(){
    return globalArray;
   }

 }