Question

所以，我有一些代码，我认为它远非伟大，但现在我有一个特别有趣的问题。

我使用PkRSS填充List。每次我来回更改片段时，列表都会在顶部添加新获取的项目，即使我在填充之前调用public class UpcommingFragment extends Fragment { public static final String rss = "XYZ.RSS"; public static List<Article> rssItems = Collections.emptyList(); public RecyclerAdapter recAdapter; private RecyclerView recList; public UpcommingFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.recycler, container, false); recList = (RecyclerView) rootView.findViewById(R.id.recyclerview); // recList.setHasFixedSize(true); LinearLayoutManager llm = new LinearLayoutManager(getActivity()); llm.setOrientation(LinearLayoutManager.VERTICAL); recList.setLayoutManager(llm); recList.setItemAnimator(new DefaultItemAnimator()); recAdapter = new RecyclerAdapter(rssItems); recList.setAdapter(recAdapter); recList.addOnItemTouchListener( new RecyclerItemClickListener(getActivity(), new RecyclerItemClickListener.OnItemClickListener() { @Override public void onItemClick(View view, int position) { Article a; a = rssItems.get(position); String date = a.getDescription().substring(0, 12); String uri = String.valueOf(a.getSource()); Intent i = new Intent(getActivity(), EventDetailActivity.class); i.putExtra("date", date); i.putExtra("head", a.getTitle()); i.putExtra("url", uri); startActivity(i); } }) ); new RSSget().execute(); return rootView; } public void onDestroy() { super.onDestroy(); rssItems = Collections.emptyList(); } public boolean isOnline() { ConnectivityManager connectivity = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity != null) { NetworkInfo[] info = connectivity.getAllNetworkInfo(); if (info != null) for (NetworkInfo anInfo : info) if (anInfo.getState() == NetworkInfo.State.CONNECTED) { return true; } } return false; } // AsyncTask private class RSSget extends AsyncTask<Void, Void, Void> { protected void onPreExecute() { super.onPreExecute(); } @Override protected Void doInBackground(Void... params) { try { rssItems = Collections.emptyList(); rssItems = PkRSS.with(getActivity()).load(rss).get(); Log.e("LISTCOUNTER", String.valueOf(rssItems.size())); } catch (Exception e) { Log.i("Error", "eror"); } return null; } @Override protected void onPostExecute(Void result) { recAdapter = new RecyclerAdapter(rssItems); recList.setAdapter(recAdapter); } } public void onResume() { super.onResume(); } }。

继承守则：

    09-12 11:33:08.050  23259-23329/com.mikebdev.douala E/LISTCOUNTER﹕ 12
09-12 11:33:11.701  23259-23306/com.mikebdev.douala E/LISTCOUNTER﹕ 24
09-12 11:33:15.017  23259-23323/com.mikebdev.douala E/LISTCOUNTER﹕ 36

并且继承了LogCat

req = "POST /incomingData/addData/"                      
        .." HTTP/1.1\r\n" 
        .."Host: secret-spire-9368.herokuapp.com\r\n" 
        .."Connection: close\r\n"
        .."Accept: */*\r\n" 
        .."User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)\r\n" 
        .."Content-Type: application/json\r\n"
        .."Content-Length: "..string.len(json).."\r\n"
        .."\r\n"
        ..json.."\r\n"

正如您所看到的，每次我来回更改片段时，List都会将这12个元素添加到顶部。

当然，如果您在此代码中找到我可以做得更好的话，我会感激不尽

如果您还需要查看其他内容，请告知我们。

提前致谢

Answer 1

不熟悉PkRSS，但在github页面上快速一瞥，似乎这是一种有状态的RSS阅读器。也许您不能简单地调用其加载方法而不清除以前读取的数据？

Answer 2

试试这个

       @Override
        protected void onPostExecute(Void result) {

        recAdapter = new RecyclerAdapter(rssItems);
        recList.setAdapter(recAdapter);
recAdapter.notifyDataSetChange();
    }
}

即使我尝试清空它，也会在AsyncTask中添加列表元素

2 个答案: