RecyclerView с разными типами и разными адаптерами

Question

и спасибо за внимание к моей просьбе.Я новичок в Andorid Studio и разрабатываю приложение, оно должно показывать список событий, курсов и новостей.Существует DrawerLayout, который позволяет перемещаться в область событий, курсов и новостей, каждая область имеет каждый отдельный RecyclerView, но в домашнем задании я должен показать все элементы (событие, курс и новости).Я создаю Адаптер для каждого элемента (потому что они имеют разные свойства), и каждый раздел (фрагмент) работает правильно, но теперь я застрял с основным действием (дом).

Вот модели для объясненияразница между ними: Событие

public class Event {

    private int id;
    private String title;
    private String description;
    private LocalDateTime startingDate;
    private LocalDateTime endingDate;
    private String cost;
    private String website;
    private Category category;
    private Venue venue;
    private Organizer organizer;
    private String status;
    private int resImage;

    public Event(int id, String title, String description, LocalDateTime startingDate, LocalDateTime endingDate, String cost, String website, Category category, Venue venue, Organizer organizer, int image) {
        this.id = id;
        this.title = title;
        this.description = description;
        this.startingDate = startingDate;
        this.endingDate = endingDate;
        this.cost = cost;
        this.website = website;
        this.category = category;
        this.venue = venue;
        this.organizer = organizer;
        this.resImage = image;
    }

    public Event(){}

    public int getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String name) {
        this.title = title;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public LocalDateTime getStartingDate() {
        return startingDate;
    }

    public void setStartingDate(LocalDateTime startingDate) {
        this.startingDate = startingDate;
    }

    public LocalDateTime getEndingDate() {
        return endingDate;
    }

    public void setEndingDate(LocalDateTime endingDate) {
        this.endingDate = endingDate;
    }

    public String getCost() {
        return cost;
    }

    public void setCost(String cost) {
        this.cost = cost;
    }

    public String getWebsite() {
        return website;
    }

    public void setWebsite(String website) {
        this.website = website;
    }

    public Category getCategory() {
        return category;
    }

    public Venue getVenue() {
        return venue;
    }

    public Organizer getOrganizer() {
        return organizer;
    }

    public String getStatus() {
        return status;
    }

    public int getResImage() {
        return resImage;
    }
}

Новости:

public class News {

    private int id;
    private String title;
    private String content;
    private int resImage;

    public News(int id, String title, String content, int image) {
        this.id = id;
        this.title = title;
        this.content = content;
        this.resImage = image;
    }

    public News(){}

    public int getId(){
        return this.id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setDescription(String description) {
        this.content = content;
    }

    public int getResImage() {
        return resImage;
    }

    public void setResImage(int resImage) {
        this.resImage = resImage;
    }

}

Курсы

public Course(int id, String title, String content, float price, LocalDate startingDate, int availablePlace, Teacher teacher, CourseCategory courseCategory, Location location, Duration duration, Level level, int resImage) {
        this.id = id;
        this.title = title;
        this.content = content;
        this.price = price;
        this.startingDate = startingDate;
        this.availablePlace = availablePlace;
        this.teacher = teacher;
        this.courseCategory = courseCategory;
        this.location = location;
        this.duration = duration;
        this.level = level;
        this.resImage = resImage;
    }

    public int getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public LocalDate getStartingDate() {
        return startingDate;
    }

    public void setStartingDate(LocalDate startingDate) {
        this.startingDate = startingDate;
    }

    public int getAvailablePlace() {
        return availablePlace;
    }

    public void setAvailablePlace(int availablePlace) {
        this.availablePlace = availablePlace;
    }

    public Teacher getTeacher() {
        return teacher;
    }

    public void setTeacher(Teacher teacher) {
        this.teacher = teacher;
    }

    public CourseCategory getCourseCategory() {
        return courseCategory;
    }

    public void setCourseCategory(CourseCategory courseCategory) {
        this.courseCategory = courseCategory;
    }

    public Location getLocation() {
        return location;
    }

    public void setLocation(Location location) {
        this.location = location;
    }

    public Duration getDuration() {
        return duration;
    }

    public void setDuration(Duration duration) {
        this.duration = duration;
    }

    public Level getLevel() {
        return level;
    }

    public int getResImage() {
        return resImage;
    }

    public void setResImage(int resImage) {
        this.resImage = resImage;
    }
}

Адаптеры: EventAdapter

public class EventViewAdapter extends RecyclerView.Adapter<EventViewAdapter.EventViewHolder> {

    ArrayList<Event> eventList;
    Context context;

    public EventViewAdapter(ArrayList<Event> eventList, Context context) {
        this.eventList = eventList;
        this.context = context;
    }

    public EventViewAdapter() {
    }

    public static class EventViewHolder extends RecyclerView.ViewHolder {

        ImageView eventImage;
        TextView startingDate, place, title;
        LinearLayout cellLayout;

        EventViewHolder(View eventView) {
            super(eventView);
            eventImage = eventView.findViewById(R.id.event_image);
            startingDate = eventView.findViewById(R.id.event_starting_date);
            place = eventView.findViewById(R.id.event_place);
            title = eventView.findViewById(R.id.event_title);
            cellLayout = eventView.findViewById(R.id.event_cell_layout);
        }
    }

    @NonNull
    @Override
    public EventViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.event_cell_def, parent, false);
        EventViewHolder evh = new EventViewHolder(view);
        return evh;
    }

    @Override
    public void onBindViewHolder(@NonNull EventViewHolder holder, int position) {
        final String title = eventList.get(position).getTitle();
        final String description = eventList.get(position).getDescription();
        final String place = eventList.get(position).getVenue().getCity();
        final String address = eventList.get(position).getVenue().getAddress();
        final String startDate = String.valueOf(eventList.get(position).getStartingDate().toLocalDate());
        final String startTime = String.valueOf(eventList.get(position).getStartingDate().getHour() + ":" + String.valueOf(eventList.get(position).getStartingDate().getMinute()));
        final String endDate = String.valueOf(eventList.get(position).getEndingDate().toLocalDate());
        final String cost = eventList.get(position).getCost();
        final String website = eventList.get(position).getWebsite();
        final String category = eventList.get(position).getCategory().getName();
        final String organizer = eventList.get(position).getOrganizer().getOrganizer();
        final String organizerWebsite = eventList.get(position).getOrganizer().getWebsite();
        final int image = eventList.get(position).getResImage();

        holder.eventImage.setImageResource(image);
        holder.startingDate.setText(startDate);
        holder.place.setText(place);
        holder.title.setText(title);

        holder.cellLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(v.getContext(), DetailEventActivity.class);
                intent.putExtra("title", title);
                intent.putExtra("description", description);
                intent.putExtra("place", place);
                intent.putExtra("address", address);
                intent.putExtra("startDate", startDate);
                intent.putExtra("startTime", startTime);
                intent.putExtra("endDate", endDate);
                intent.putExtra("cost", cost);
                intent.putExtra("website", website);
                intent.putExtra("category", category);
                intent.putExtra("organizer", organizer);
                intent.putExtra("orgWebsite", organizerWebsite);
                intent.putExtra("image", image);

                v.getContext().startActivity(intent);
                Toast.makeText(context, "Hai premuto su: " + title, Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return eventList.size();
    }

    public void eventSetSearchOperation(ArrayList<Event> newList){
        eventList = new ArrayList<>();
        eventList.addAll(newList);
        notifyDataSetChanged();
    }
}

CourseAdapter:

public class CourseViewAdapter extends RecyclerView.Adapter<CourseViewAdapter.CourseViewHolder> {

    ArrayList<Course> courseList;
    Context context;

    public CourseViewAdapter(ArrayList<Course> courseList, Context context) {
        this.courseList = courseList;
        this.context = context;
    }

    public CourseViewAdapter(){}

    public static class CourseViewHolder extends RecyclerView.ViewHolder {

        ImageView courseImage;
        TextView startingDate, place, title;
        LinearLayout courseLinear;

        CourseViewHolder(View courseView){
            super(courseView);
            courseImage = courseView.findViewById(R.id.course_image);
            startingDate = courseView.findViewById(R.id.course_starting_date);
            place = courseView.findViewById(R.id.course_place);
            title = courseView.findViewById(R.id.course_title);
            courseLinear = courseView.findViewById(R.id.course_cell_layout);
        }
    }

    @NonNull
    @Override
    public CourseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.course_cell_def, parent, false);
        CourseViewHolder cvh = new CourseViewHolder(view);
        return cvh;
    }

    @Override
    public void onBindViewHolder(@NonNull CourseViewHolder holder, int position) {
        final String title = courseList.get(position).getTitle();
        final String category = courseList.get(position).getCourseCategory().getName();
        final String description = courseList.get(position).getContent();
        final String place = courseList.get(position).getLocation().getName();
        final String startDate = String.valueOf(courseList.get(position).getStartingDate());
        final int availablePlace = courseList.get(position).getAvailablePlace();
        final String teacher = courseList.get(position).getTeacher().getName();
        final String teacherEmail = courseList.get(position).getTeacher().getEmail();
        final String teacherMobile = courseList.get(position).getTeacher().getPhone();
        final String duration = courseList.get(position).getDuration().getName();
        final String level = courseList.get(position).getLevel().getName();
        final String price = String.valueOf(courseList.get(position).getPrice());
        final int image = courseList.get(position).getResImage();

        holder.courseImage.setImageResource(image);
        holder.startingDate.setText(startDate);
        holder.place.setText(place);
        holder.title.setText(title);

        holder.courseLinear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(v.getContext(), DetailCourseActivity.class);
                intent.putExtra("title", title);
                intent.putExtra("category", category);
                intent.putExtra("content", description);
                intent.putExtra("startDate", startDate);
                intent.putExtra("availablePlace", availablePlace);
                intent.putExtra("teacher", teacher);
                intent.putExtra("teacherEmail", teacherEmail);
                intent.putExtra("teacherMobile", teacherMobile);
                intent.putExtra("duration", duration);
                intent.putExtra("price", price);
                intent.putExtra("place", place);
                intent.putExtra("level", level);
                intent.putExtra("image", image);
                v.getContext().startActivity(intent);
                Toast.makeText(context, "Hai premuto su: " + title, Toast.LENGTH_SHORT).show();
            }
        });

    }

    @Override
    public int getItemCount() {
        return courseList.size();
    }

    public void courseSetSearchOperation(ArrayList<Course> newList){
        courseList = new ArrayList<>();
        courseList.addAll(newList);
        notifyDataSetChanged();
    }
}

Новости:

public class NewsViewAdapter extends RecyclerView.Adapter<NewsViewAdapter.NewsViewHolder> {

    ArrayList<News> newsList;
    Context context;

    public NewsViewAdapter(ArrayList<News> newsList, Context context) {
        this.newsList = newsList;
        this.context = context;
    }

    public NewsViewAdapter(){}

    public static class NewsViewHolder extends RecyclerView.ViewHolder {
        ImageView newsImage;
        TextView newsTitle, newsContent;
        LinearLayout newsLayout;

        NewsViewHolder(View newView){
            super(newView);
            newsImage = newView.findViewById(R.id.news_image);
            newsTitle = newView.findViewById(R.id.news_title);
            newsContent = newView.findViewById(R.id.news_content);
            newsLayout = newView.findViewById(R.id.news_cell_layout);
        }
    }

    @NonNull
    @Override
    public NewsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_cell_def, parent, false);
        NewsViewHolder nvh = new NewsViewHolder(view);
        return nvh;
    }

    @Override
    public void onBindViewHolder(@NonNull NewsViewHolder holder, int position) {

        final String title = newsList.get(position).getTitle();
        final String content = newsList.get(position).getContent();
        final int image = newsList.get(position).getResImage();


        holder.newsImage.setImageResource(image);
        holder.newsTitle.setText(title);
        holder.newsContent.setText(content);

        holder.newsLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(v.getContext(), DetailNewsActivity.class);
                intent.putExtra("title", title);
                intent.putExtra("content", content);
                intent.putExtra("image", image);
                v.getContext().startActivity(intent);
                Toast.makeText(context, "Premuto su: " + title, Toast.LENGTH_SHORT).show();
            }
        });

    }

    @Override
    public int getItemCount() {
        return newsList.size();
    }

    public void newsSetSearchOperation(ArrayList<News> newList){
        newsList = new ArrayList<>();
        newsList.addAll(newList);
        notifyDataSetChanged();
    }
}

Каждый конкретный список элементов находится во фрагменте, на самом деле, это Основная активность (главная), где я хотел бы отобразить RecyclerViewиз всех тем:

public class MainActivity extends AppCompatActivity {

    private DrawerLayout drawerLayout;
    private NavigationView mNavigationView;
    private Toolbar toolbar;
    private ActionBarDrawerToggle drawerToggle;
    private FloatingActionButton fab;
    private RecyclerView mRecyclerView;
    private ImageView openFilter;
    private SearchView searchView;
    private DataMock dataMock = new DataMock();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mRecyclerView = findViewById(R.id.recycler_view_main);
        drawerLayout = findViewById(R.id.drawer_layout);
        mNavigationView = findViewById(R.id.nav_view);
        toolbar = findViewById(R.id.toolbar);
        openFilter = findViewById(R.id.filter_icon);
        searchView = findViewById(R.id.action_search);
        fab = findViewById(R.id.fab);
        fab.show();

        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        searchView.setQueryHint(getString(R.string.search_hint));

        drawerToggle = setupDrawerToggle();
        drawerToggle.setDrawerIndicatorEnabled(true);
        drawerToggle.syncState();

        drawerLayout.setDrawerListener(drawerToggle);

        drawerLayout.setDrawerListener(new DrawerLayout.SimpleDrawerListener() {

            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
            }
        });

        mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                Fragment nextFragment;
                switch (menuItem.getItemId()){
                    case R.id.event_list:
                        nextFragment = new EventFragment();
                        break;
                    case R.id.course_list:
                        nextFragment = new CourseFragment();
                        break;
                    case R.id.news_list:
                        nextFragment = new NewsFragment();
                        break;
                    default:
                        throw new IllegalArgumentException("No Fragment for the given menu item");
                }
                if (nextFragment != null){
                    getSupportFragmentManager()
                            .beginTransaction()
                            .replace(R.id.anchor_point, nextFragment)
                            .commit();
                    menuItem.setChecked(true);
                    setTitle(menuItem.getTitle());
                    drawerLayout.closeDrawer(mNavigationView);
                }
                return false;
            }
        });

        openFilter.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                BottomSheetDialog filterDialog = new BottomSheetDialog();
                filterDialog.show(getSupportFragmentManager(), "filter dialog opened!");
            }
        });

//        mRecyclerView.setHasFixedSize(true);
//        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
//        mRecyclerView.setLayoutManager(layoutManager);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // The action bar home/up action should open or close the drawer.
        switch (item.getItemId()) {
            case android.R.id.home:
                drawerLayout.openDrawer(GravityCompat.START);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private ActionBarDrawerToggle setupDrawerToggle() {
        // NOTE: Make sure you pass in a valid toolbar reference.  ActionBarDrawToggle() does not require it
        // and will not render the hamburger icon without it.
        return new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.drawer_open,  R.string.drawer_close);
    }

    public void backToHome(View view){

        for (Fragment fragment : getSupportFragmentManager().getFragments()){
            if (fragment != null && (fragment instanceof CourseFragment || fragment instanceof EventFragment || fragment instanceof NewsFragment)){
                getSupportFragmentManager().beginTransaction().remove(fragment).commit();
                toolbar.setTitle("WePress");
                fab.show();
            }
        }
        Toast.makeText(this, "Premuto sul logo", Toast.LENGTH_SHORT).show();
        drawerLayout.closeDrawer(mNavigationView);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        drawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggles
        drawerToggle.onConfigurationChanged(newConfig);
    }

    public void addItem(View view){
        PopupMenu popupMenu = new PopupMenu(MainActivity.this, fab);
        popupMenu.getMenuInflater().inflate(R.menu.fab_main_menu, popupMenu.getMenu());
        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                switch (item.getItemId()){
                    case R.id.add_event:
                        Toast.makeText(MainActivity.this, "Pronti per aggiungere un evento", Toast.LENGTH_SHORT).show();
                        Intent intentEvent = new Intent(MainActivity.this, AddItemActivity.class);
                        intentEvent.putExtra("isFrom", "event");
                        startActivity(intentEvent);
                        break;
                    case R.id.add_course:
                        Toast.makeText(MainActivity.this, "Pronti per aggiungere un corso", Toast.LENGTH_SHORT).show();
                        Intent intentCourse = new Intent(MainActivity.this, AddItemActivity.class);
                        intentCourse.putExtra("isFrom", "course");
                        startActivity(intentCourse);
                        break;
                    case R.id.add_news:
                        Toast.makeText(MainActivity.this, "Pronti per aggiungere una news", Toast.LENGTH_SHORT).show();
                        Intent intentNews = new Intent(MainActivity.this, AddItemActivity.class);
                        intentNews.putExtra("isFrom", "news");
                        startActivity(intentNews);
                        break;
                }
                return true;
            }
        });
        popupMenu.show();
    }
}

если можно отобразить список с разными макетами, можете ли вы предложить способ улучшить качество моего кода, избегая повторения строк кода?Если я не ошибаюсь, я хотел бы повторно использовать каждый адаптер или его часть, которые я могу поместить в определенный класс (?).Спасибо большое за вашу помощь!Если мне не хватает какой-либо информации, пожалуйста, спросите меня, чтобы отредактировать пост.

Answer 1

Вы должны сделать только один адаптер (используя тип представления) с классом модели представления, который содержит событие, или новость, или курс

адаптер должен быть примерно таким:

public class EventViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private static final int TYPE_EVENT = 10;
    private static final int TYPE_COURSE = 11;
    private static final int TYPE_NEWS = 12;

    ArrayList<EventViewModel> eventList;
    Context context;

    public EventViewAdapter(ArrayList<EventViewModel> eventList, Context context) {
        this.eventList = eventList;
        this.context = context;
    }

    public EventViewAdapter() {
    }

    @Override
    public int getItemViewType(int position) {
        EventViewModel event = eventList.get(position);
        if (event.isEvent()) {
            return TYPE_EVENT ;
        } else if(event.isCourse()) {
            return TYPE_COURSE;
        } else {
            return TYPE_NEWS;
        }
    }

    public static class EventViewHolder extends RecyclerView.ViewHolder {

        ImageView eventImage;
        //....
        EventViewHolder(View eventView) {
            super(eventView);
            eventImage = eventView.findViewById(R.id.event_image);
            //.....
        }
    }

    public static class CourseViewHolder extends RecyclerView.ViewHolder {

        ImageView courseImage;
        //.....

        CourseViewHolder(View courseView) {
        super(courseView);
            courseImage = courseView.findViewById(R.id.course_image);
            //.....
        }

    public static class NewsViewHolder extends RecyclerView.ViewHolder {
        ImageView newsImage;
        //.....

        NewsViewHolder(View newView){
            super(newView);
            newsImage = newView.findViewById(R.id.news_image);
            //.....
        }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        if (viewType == TYPE_EVENT) {
            View rootView =     LayoutInflater.from(parent.getContext()).inflate(R.layout.event_cell_def, parent, false);
            return new EventViewHolder (rootView);
        } else if (viewType == TYPE_COURSE) {
            View rootView = LayoutInflater.from(parent.getContext()).inflate(R.layout.course_cell_def, parent, false);
            return new CourseViewHolder(rootView);
        } else {
            View rootView = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_cell_def, parent, false);
            return new NewsViewHolder(rootView);
        }

    }

    @Override
    public void onBindViewHolder(@NonNull EventViewHolder holder, int position) 
    {
        final EventViewModel eventViewModel = eventList.get(position);
        if (eventViewModel .isEvent()) {
            onBindEvent(holder, eventViewModel.getEvent());
        } else if(eventViewModel .isCourse()) {
            onBindCourse(holder, eventViewModel.getCourse());
        } else {
            onBindNews(holder, eventViewModel.getNews());
        }
    }

    private void onBindEvent(RecyclerView.ViewHolder holder, Event event) {
        EventViewHolder eventHolder= (EventViewHolder ) holder;

        final String title = event.getTitle();
        final String description = event.getDescription();
        // others ...

        holder.eventImage.setImageResource(image);
        holder.startingDate.setText(startDate);
        // others ...

        holder.cellLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            }
        });
        // ...
    }

    @Override
    public int getItemCount() {
        return eventList.size();
    }

    public void eventSetSearchOperation(ArrayList<Event> newList){
        eventList = new ArrayList<>();
        eventList.addAll(newList);
        notifyDataSetChanged();
    }
}

И такие классы View Model:

public class EventViewModel() {

    private Event mEvent;
    private Course mCourse;
    private News mNews;

    private EventViewModel(Event event, Course course, News news) {
        this.mEvent = event;
        this.mCourse = course;
        this.mNews = news;
    }

    public boolean isEvent() {
        return mEvent != null
    }
    public boolean isCourse() {
        return mCourse != null
    }
    public boolean isNews() {
        return mNews != null
    }

    public static EventViewModel getEventInstance(Event event) {
        return new EventViewModel(event, null, null 
    } 
    public static EventViewModel getCourseInstance(Course course) {
        return new EventViewModel(null, course, null 
    } 
    public static EventViewModel getNewsInstance(News news) {
        return new EventViewModel(null, null, news
    } 

    public Event getEvent() {
        return mEvent;
    }
    public Event getCourse() {
        return mScore;
    }
    public Event getNews() {
        return mNews;
    }


}

Вы можете использовать этот адаптер во всех своих фрагментах (событие, курс,news), и каждый фрагмент содержит список EventViewModel только с его конкретным типом.Отображение адаптера в основном действии содержит EventViewModel всех типов для отображения всех событий.