我想,他们中的GiPagerAdapter想到活动,不知道如何去做。 这一格式适应者。 添加Frag(新的RsFragment,“新闻”;如何改变变换者。 增加Frag(新活动,“新闻”)

   `public class ScrollableTabsActivity extends AppCompatActivity {
    private Toolbar toolbar;
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private AdView mAdView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scrollable_tabs);
        mAdView = findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);
        toolbar = (Toolbar) findViewById(R.id.toolbar2);
        setSupportActionBar(toolbar);

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        setupViewPager(viewPager);

        tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(viewPager);
    }

    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFrag(new RssFragment(), "వార్తలు");
        adapter.addFrag(new RssFragment2(), "సినిమా");
        adapter.addFrag(new RssFragment3(), "చదువు");

        adapter.addFrag(new RssFragment4(), "జ్యోతిషశాస్త్రం");
        adapter.addFrag(new RssFragment5(), "క్రీడలు");

        adapter.addFrag(new RssFragment6(), "రాజకీయాలు");
        adapter.addFrag(new RssFragment7(), "సాధారణ");
        adapter.addFrag(new RssFragment8(), "వంటకాలు");


        viewPager.setAdapter(adapter);
    }
    @Override
    public void onBackPressed() {
        new AlertDialog.Builder(this).setIcon(android.R.drawable.ic_dialog_alert).setTitle("Exit")
                .setMessage("Are you sure you want to exit?")
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        finish();
                    }
                }).setNegativeButton("No", null).show();
    }

    class ViewPagerAdapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();

        public
        ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        }

        @Override
        public int getCount() {
            return mFragmentList.size();
        }

        public void addFrag(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }
    }
    }

ViewPagerAdapter Adaptationer = New ViewPagerAdapter (getSupportFragmentManager()); tjis how to set activity category