Day02Fragment.java

package com.example.bettingsignals.Fragment;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import com.example.bettingsignals.Activity.MainActivity;
import com.example.bettingsignals.Adapter.FragmentLifeCycles;
import com.example.bettingsignals.Adapter.RecyclerViewAdapterHome;
import com.example.bettingsignals.Database.Article;
import com.example.bettingsignals.OnDataLoaded;
import com.example.bettingsignals.R;

import java.util.ArrayList;
import java.util.List;

public class Day02Fragment extends Fragment implements FragmentLifeCycles, SwipeRefreshLayout.OnRefreshListener, OnDataLoaded {

    private View v;
    private SwipeRefreshLayout refreshLayout;

    @Override
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);
        ((MainActivity) getActivity()).setOnDataLoadedListener(this);
    }

    public Day02Fragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        if (savedInstanceState == null) {
            v = inflater.inflate(R.layout.fragment_day02, container, false);
        }
        return v;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        refreshLayout = view.findViewById(R.id.swipe_container);
        refreshLayout.setOnRefreshListener(this);
        //refreshLayout.setColorScheme();
    }

    /* Imposta il RecyclerView */
    private void setUpRecyclerView(View v) {
        RecyclerView recyclerView = v.findViewById(R.id.recyclerView);
        RecyclerViewAdapterHome adapter = new RecyclerViewAdapterHome(MainActivity.getDay02List(), getActivity());
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerView.setHasFixedSize(true);
        recyclerView.setAdapter(adapter);
    }

    @Override
    public void dataChanged() {
        if (!MainActivity.getDay02List().isEmpty()) {
            setUpRecyclerView(v);
        }
    }

    @Override
    public void onResumeFragment() {
        if (!MainActivity.getDay02List().isEmpty()) {
            setUpRecyclerView(v);
        }
    }

    @Override
    public void onRefresh() {
        new MainActivity().updateDay02(getActivity());
        refreshLayout.setRefreshing(false);
    }
}

MainActivity.java

package com.example.bettingsignals.Activity;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.viewpager.widget.ViewPager;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.example.bettingsignals.Adapter.FragmentLifeCycles;
import com.example.bettingsignals.Adapter.PagerAdapter;
import com.example.bettingsignals.Database.Article;
import com.example.bettingsignals.Fragment.Day01Fragment;
import com.example.bettingsignals.Fragment.Day02Fragment;
import com.example.bettingsignals.Fragment.Day03Fragment;
import com.example.bettingsignals.Fragment.Day04Fragment;
import com.example.bettingsignals.Fragment.Day05Fragment;
import com.example.bettingsignals.Fragment.Day06Fragment;
import com.example.bettingsignals.Fragment.Day07Fragment;
import com.example.bettingsignals.HelpActivity;
import com.example.bettingsignals.OnDataLoaded;
import com.example.bettingsignals.R;
import com.google.android.material.tabs.TabLayout;
//import com.squareup.picasso.Picasso;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Toolbar toolbar;
    private ViewPager viewPager;
    private TabLayout tabLayout;
    private String responseRequest;
    private OnDataLoaded onDataLoaded;
    private static List<Article> day01List;
    private static List<Article> day02List;
    private static List<Article> day03List;
    private static List<Article> day04List;
    private static List<Article> day05List;
    private static List<Article> day06List;
    private static List<Article> day07List;
    private Context mContext;
    private PagerAdapter adapter;
    ImageButton help_button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        help_button = (ImageButton) findViewById(R.id.icon_help_button);
        help_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intentLoadNewActivity = new Intent(MainActivity.this, HelpActivity.class);
                startActivity(intentLoadNewActivity);
            }
        });

        toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mContext = getApplicationContext();

        // Inizializa Liste
        day01List = new ArrayList<>();
        day02List = new ArrayList<>();
        day03List = new ArrayList<>();
        day04List = new ArrayList<>();
        day05List = new ArrayList<>();
        day06List = new ArrayList<>();
        day07List = new ArrayList<>();

        viewPager = findViewById(R.id.viewPager);
        tabLayout = findViewById(R.id.tabLayout);
        setUpViewPager(viewPager);

        tabLayout.setupWithViewPager(viewPager);

        // Download Xml e creo Liste
        downloadData("https://os.betsig.com/rss/1.php?rssapikey=yw8o3%C3%A0hr!", day01List, mContext);
        downloadData("https://os.betsig.com/rss/2.php?rssapikey=yw8o3%C3%A0hr!", day02List, mContext);
        downloadData("https://os.betsig.com/rss/3.php?rssapikey=yw8o3%C3%A0hr!", day03List, mContext);
        downloadData("https://os.betsig.com/rss/4.php?rssapikey=yw8o3%C3%A0hr!", day04List, mContext);
        downloadData("https://os.betsig.com/rss/5.php?rssapikey=yw8o3%C3%A0hr!", day05List, mContext);
        downloadData("https://os.betsig.com/rss/6.php?rssapikey=yw8o3%C3%A0hr!", day06List, mContext);
        downloadData("https://os.betsig.com/rss/7.php?rssapikey=yw8o3%C3%A0hr!", day07List, mContext);

        // Image Load
        /*ImageView imageView = findViewById(R.id.imageBandiera);
        String url = "https://cdn.sportmonks.com/images/soccer/leagues/501.png";
        Picasso.with(this).load(url).into(imageView);*/

        // Move to actual date tab when open app
        viewPager.setCurrentItem(1);

    }

    public void setOnDataLoadedListener(OnDataLoaded onDataLoaded) {
        this.onDataLoaded = onDataLoaded;
    }


    public void updateDay01(Context context) {
        day01List.clear();
        downloadData("https://os.betsig.com/rss/1.php?rssapikey=yw8o3%C3%A0hr!", day01List, context);
    }

    public void updateDay02(Context context) {
        day02List.clear();
        downloadData("https://os.betsig.com/rss/2.php?rssapikey=yw8o3%C3%A0hr!", day02List, context);
    }

    public void updateDay03(Context context) {
        day03List.clear();
        downloadData("https://os.betsig.com/rss/3.php?rssapikey=yw8o3%C3%A0hr!", day03List, context);
    }

    public void updateDay04(Context context) {
        day04List.clear();
        downloadData("https://os.betsig.com/rss/4.php?rssapikey=yw8o3%C3%A0hr!", day04List, context);
    }

    public void updateDay05(Context context) {
        day05List.clear();
        downloadData("https://os.betsig.com/rss/5.php?rssapikey=yw8o3%C3%A0hr!", day05List, context);
    }

    public void updateDay06(Context context) {
        day06List.clear();
        downloadData("https://os.betsig.com/rss/6.php?rssapikey=yw8o3%C3%A0hr!", day06List, context);
    }

    public void updateDay07(Context context) {
        day07List.clear();
        downloadData("https://os.betsig.com/rss/7.php?rssapikey=yw8o3%C3%A0hr!", day07List, context);
    }

    private void setUpViewPager(ViewPager viewPager) {

        /* Generazione Date dei Giorni */
        Calendar calendar = Calendar.getInstance();
        /* Giorno 1 */
        calendar.add(Calendar.DAY_OF_YEAR, -1);
        Date Day01Date = calendar.getTime();
        String Day01 = new SimpleDateFormat("EEE\ndd").format(Day01Date);
        /* Giorno 2 */
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        Date Day02Date = calendar.getTime();
        String Day02 = new SimpleDateFormat("EEE\ndd").format(Day02Date);
        /* Giorno 3 */
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        Date Day03Date = calendar.getTime();
        String Day03 = new SimpleDateFormat("EEE\ndd").format(Day03Date);
        /* Giorno 4 */
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        Date Day04Date = calendar.getTime();
        String Day04 = new SimpleDateFormat("EEE\ndd").format(Day04Date);
        /* Giorno 5 */
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        Date Day05Date = calendar.getTime();
        String Day05 = new SimpleDateFormat("EEE\ndd").format(Day05Date);
        /* Giorno 6 */
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        Date Day06Date = calendar.getTime();
        String Day06 = new SimpleDateFormat("EEE\ndd").format(Day06Date);
        /* Giorno 7 */
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        Date Day07Date = calendar.getTime();
        String Day07 = new SimpleDateFormat("EEE\ndd").format(Day07Date);

        adapter = new PagerAdapter(getSupportFragmentManager());
        adapter.addFragment(Day01, new Day01Fragment());
        adapter.addFragment(Day02, new Day02Fragment());
        adapter.addFragment(Day03, new Day03Fragment());
        adapter.addFragment(Day04, new Day04Fragment());
        adapter.addFragment(Day05, new Day05Fragment());
        adapter.addFragment(Day06, new Day06Fragment());
        adapter.addFragment(Day07, new Day07Fragment());
        viewPager.setAdapter(adapter);
        viewPager.setOnPageChangeListener(pageChangeListener);

    }

    public void downloadData(String url, final List<Article> articles, Context context) {

        final StringRequest request = new StringRequest(Request.Method.GET, url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        if (response.length() > 0) {
                            responseRequest = response;
                            try {
                               parseXML(articles);
                            } catch (XmlPullParserException e) {
                                e.printStackTrace();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }

                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });

        Volley.newRequestQueue(context).add(request);

    }

    private void parseXML(List<Article> articles) throws XmlPullParserException, IOException {
        XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
        XmlPullParser parser = factory.newPullParser();

        InputStream is = new ByteArrayInputStream(responseRequest.getBytes("UTF-8"));
        parser.setInput(is, null);
        parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
        processParsing(parser, articles);

        if (onDataLoaded != null) {
            onDataLoaded.dataChanged();
        }
    }

    private void processParsing(XmlPullParser parser, List<Article> articles) throws XmlPullParserException, IOException {
        int evenType = parser.getEventType();
        Article article = null;

        while (evenType != XmlPullParser.END_DOCUMENT) {
            String valName;

            switch (evenType) {
                case XmlPullParser.START_DOCUMENT:
                    break;

                case XmlPullParser.START_TAG:
                    valName = parser.getName();

                    if (valName.equals("item")) {
                        article = new Article();
                        articles.add(article);
                    } else if (article != null) {
                        if (valName.equals("nazione")) {
                            article.setNazione(parser.nextText());
                        } else if (valName.equals("data")) {
                            article.setData(parser.nextText());
                        } else if (valName.equals("campionato")) {
                            article.setCampionato(parser.nextText());
                        } else if (valName.equals("squadracasa")) {
                            article.setSquadracasa(parser.nextText());
                        } else if (valName.equals("squadraospite")) {
                            article.setSquadraospite(parser.nextText());
                        } else if (valName.equals("squadracasalvresult")) {
                            article.setSquadracasalvresult(parser.nextText());
                        } else if (valName.equals("squadraospitelvresult")) {
                            article.setSquadraospitelvresult(parser.nextText());
                        } else if (valName.equals("squadracasahtresult")) {
                            article.setSquadracasahtresult(parser.nextText());
                        } else if (valName.equals("squadraospitehtresult")) {
                            article.setSquadraospitehtresult(parser.nextText());
                        } else if (valName.equals("squadracasaftresult")) {
                            article.setSquadracasaftresult(parser.nextText());
                        } else if (valName.equals("squadraospiteftresult")) {
                            article.setSquadraospiteftresult(parser.nextText());
                        } else if (valName.equals("market")) {
                            article.setMarket(parser.nextText());
                        } else if (valName.equals("quota")) {
                            article.setQuota(parser.nextText());
                        } else if (valName.equals("probabilita")) {
                            article.setProbabilita(parser.nextText());
                        }
                    }
                    break;
            }
            evenType = parser.next();
        }

    }

    public static List<Article> getDay01List() {
        return day01List;
    }

    public static List<Article> getDay02List() {
        return day02List;
    }

    public static List<Article> getDay03List() {
        return day03List;
    }

    public static List<Article> getDay04List() {
        return day04List;
    }

    public static List<Article> getDay05List() {
        return day05List;
    }

    public static List<Article> getDay06List() {
        return day06List;
    }

    public static List<Article> getDay07List() {
        return day07List;
    }

    private ViewPager.OnPageChangeListener pageChangeListener = new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            FragmentLifeCycles fragmentLifeCycles = (FragmentLifeCycles) adapter.getItem(position);
            fragmentLifeCycles.onResumeFragment();
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    };
}

OnDataLoaded.java

package com.example.bettingsignals;

import com.example.bettingsignals.Database.Article;
import java.util.List;

public interface OnDataLoaded {
    void dataChanged();
}