java - 实现从主到片段的菜单项

问题描述

祝大家有美好的一天。在选项菜单项上单击我运行一个方法它工作正常但如果再次单击列表更新但列表的第一项不会延迟它显示两次。需要单击列表视图刷新并且列表仅显示新项目。

这是选项卡布局，所以我只写一些代码

主要活动

TAZA taza;

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter ( FragmentManager fm ) {
        super(fm);
    }

    @Override
    public Fragment getItem ( int position ) {


        switch (position) {
            case 0:
                 taza = new TAZA();

                return taza;


        return null;
    }


    @Override
public boolean onCreateOptionsMenu ( Menu menu ) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected ( MenuItem item ) {

    int id = item.getItemId();

    if (id == R.id.refresh) {

       taza.aa();


        return true;
}

这是片段选项卡；塔扎.java

 public class TAZA extends Fragment {


public TAZA () {
    // Required empty public constructor
}


ArrayList <NewsItem> newsItemsList;
ListView lvRss;
NewsAdaptor adapter;
Button button;
ProgressDialog pDialog;
@Override
public View onCreateView ( LayoutInflater inflater, ViewGroup container,
                           Bundle savedInstanceState ) {

    View view = inflater.inflate(R.layout.taza, container, false);
    lvRss = (ListView) view.findViewById(R.id.listtaza);
    newsItemsList = new ArrayList <>();
    RequestQueue queue = MySingleton.getInstance(getActivity().getApplicationContext()).
            getRequestQueue();


    return view;
}



    public void aa(){
    StringRequest stringRequest1 = new StringRequest
        ("https://politepol.com/feed/18863", new Response.Listener <String>() {

            @Override
            public void onResponse ( String response ) {
                Log.d("asd","aa");
                Document documentgeo = Jsoup.parse(response);
                Elements itemElementsge = documentgeo.getElementsByTag("item");
                for (int i = 0; i < itemElementsge.size(); i++) {
                    Element itemge = itemElementsge.get(i);

                    String s = itemge.child(0).text();
                    Document document1 = Jsoup.parse(s);
                    String img = document1.getElementsByTag("img").first().attr("src");
                    String title = document1.getElementsByTag("img").first().attr("title");
                    String link = document1.getElementsByTag("a").first().attr("href");
                    String dateeee = rem1(itemge.child(3).text());
                    Log.d("zxc",""+link);
                    String datevee = dateeee;
                    SimpleDateFormat spf = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss");
                    Date newDate = null;
                    try {
                        newDate = spf.parse(datevee);
                    } catch (ParseException e) {
                        e.printStackTrace();
                    }
                    spf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
                    datevee = spf.format(newDate);

                    NewsItem newsItem = new NewsItem();
                    newsItem.setImagePath(img);
                    newsItem.setDate(datevee);
                    newsItem.setTitle(title);
                    newsItem.setLink(link);
                    newsItem.setDatedisplay("DATE" + "  " + rem(datevee));
                    newsItemsList.add(newsItem);

                }
                adapter = new NewsAdaptor(getContext(), newsItemsList);
                lvRss.setAdapter(adapter);
                lvRss.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick ( AdapterView <?> parent, View view, int position, long id ) {

                        NewsItem currentNews = newsItemsList.get(position);
                        Intent intent = new Intent(getContext(), Detail.class);
                        intent.putExtra("NEWS", currentNews);
                        startActivity(intent);
                    }
                });
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse ( VolleyError error ) {
                aa();
                Log.d("asd","a");
            }
        });
    MySingleton.getInstance(getContext()).addToRequestQueue(stringRequest1);
}

新闻笔记本

public class NewsAdaptor extends BaseAdapter {
TextView tvtitle;
RelativeLayout view2;
Context context;

private int color;
private int colorback;
private int textSize;

public NewsAdaptor ( Context context, ArrayList <NewsItem> newsList ) {
    this.context = context;
    this.newsList = newsList;
    this.color = Color.RED;

}

ArrayList <NewsItem> newsList;


@Override
public int getCount () {

    return newsList.size();
}

@Override
public Object getItem ( int position ) {

    return newsList.get(position);
}

@Override
public long getItemId ( int position ) {
    return 0;
}

@SuppressLint("ResourceAsColor")
@Override
public View getView ( int position, View convertView, ViewGroup parent ) {
    if (convertView == null) {
        convertView = View.inflate(context, R.layout.newsitemlist_layout, null);

    }
    NewsItem currentNews = newsList.get(position);
    ImageView iv1 = (ImageView) convertView.findViewById(R.id.mainimg);
    tvtitle = (TextView) convertView.findViewById(R.id.textView1id);

    TextView tvdate = (TextView) convertView.findViewById(R.id.pubDateid);

    tvtitle.setText(currentNews.getTitle());
    tvdate.setText(currentNews.getDatedisplay());
    return convertView;
}

标签： javaandroidandroid-menu

java - 实现从主到片段的菜单项

问题描述

解决方案

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