Question

当用户点击链接时，我正在调用另一个片段来显示其内容，我正在使用fragmentTransaction.addToBackStack(null)来恢复上一个片段，当我删除它时没有问题，但是backpage没有保存，请帮助我< / p>

所以在这里我想回到页面但没有重新添加数据。

我的第二个问题是当我转到那个片段的第二个片段时，我想在工具栏/操作栏上添加backbutton图标

片段一：

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view= inflater.inflate(R.layout.fragment_notification, container, false);
        recyclerView=(RecyclerView)view.findViewById(R.id.notification_recyclerview);
        load_data_from_server();
        linearLayoutManager=new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(linearLayoutManager);
        notificationAdapter=new NotificationAdapter(notification,getActivity());
        recyclerView.setAdapter(notificationAdapter);


        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                //super.onScrolled(recyclerView, dx, dy);
                if(linearLayoutManager.findLastCompletelyVisibleItemPosition()==notification.size()-1)
                {
                    databaseHelper=new DatabaseHelper(getActivity());
                    Cursor all_data=databaseHelper.get_all_scrolled_data_from_news(notification.get(notification.size()-1).getServer_id());
                    if(all_data.getCount()>0)
                    {
                        Toast.makeText(getActivity(),"total"+all_data.getCount(),Toast.LENGTH_SHORT).show();
                        try {
                            while (all_data.moveToNext())
                            {
                                Notification_Data n_data=new Notification_Data(all_data.getInt(0),all_data.getInt(1),all_data.getString(2),all_data.getString(3));
                                notification.add(n_data);
                            }
                            notificationAdapter.notifyDataSetChanged();

                        }
                        finally
                        {
                            all_data.close();
                        }
                    }
                    else
                    {
                        Toast.makeText(getActivity(),"No more data available",Toast.LENGTH_SHORT).show();
                    }

                }

            }
        });

        swipeRefreshLayout=(SwipeRefreshLayout)view.findViewById(R.id.notification_swiperefresh);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {

                refreshItems();
            }
        });




        return view;
    }

recyclerAdapter类：

NotificationDescriptionFragment noti_desc=new NotificationDescriptionFragment();
                Bundle bundle=new Bundle();
                bundle.putInt("server_id",noti_data.get(position).getServer_id());
                noti_desc.setArguments(bundle);
                MainActivity mainActivity=(MainActivity)context;
                fragmentTransaction=mainActivity.getSupportFragmentManager().beginTransaction();
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.replace(R.id.main_container,noti_desc);
                fragmentTransaction.commit();





public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment

        //int value=getArguments().getInt("server_id");

        View view= inflater.inflate(R.layout.fragment_notification_description, container, false);
        TextView notification_content=(TextView) view.findViewById(R.id.notification_content);


        databaseHelper=new DatabaseHelper(getActivity());
        Cursor c=databaseHelper.get_contnt_by_id_from_news(server_id);
        while (c.moveToNext())
        {

            notification_content.setText(Html.fromHtml(c.getString(0)));

        }


        return view;
    }

截图：

1 - 第一个片段，我在其中创建了带有回收站视图的列表

现在当用户点击任何项目转到另一个片段的内容时，这是第二个片段：

当我按下第二个片段的后退按钮时添加到回收站视图中的相同数据是屏幕截图：

Answer 1

在添加之前清除列表（即您的情况下的通知）。

从recyclerview开始碎片，当我按下按钮recyclelerview再次添加相同的数据

1 个答案: