Хоризонтален и вертикален RecyclerView под един и същ свитък

Съжалявам, ако това обяснение е твърде абстрактно. Уведомете ме, ако имате нужда да бъда по-ясен.

public class VerticalAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{

private static final int TYPE_HEADER = 0;
private static final int TYPE_POST = 1;

List<Post> posts;
List<FeedItems> feedItems; //this array is going to populate the horizontal recycler view. Notice that is passed it on the adapter constructor

public VerticalAdapter(List<Post> posts,List<FeedItems> feedItems) {
    this.posts = posts;
    this.feedItems = feedItems;
}

public void notifyFeedChanged(List<FeedItems> newFeedItems){
    this.feedItems.clear();
    this.feedItems = newFeedItems; //set the new feed items in the array
    notifyItemChanged(0); //tell the main recycler view "Hey, update your first position". This will cause the onBindViewHolder to be called again an thus, the new items will be set into the horizontal recycler view
}

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

    if (viewType == TYPE_HEADER)
        return new HeaderViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.your_header_layout, false));
    else if (viewType == TYPE_POST)
        return new PostViewHolder (LayoutInflater.from(parent.getContext()).inflate(R.layout.your_post_layout, false));

    throw new RuntimeException("Don't know this type");
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {


    if (holder instanceof HeaderViewHolder){
        //set adapter for the horizontal recycler view
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(((HeaderViewHolder) holder).recyclerView.getContext(),LinearLayoutManager.HORIZONTAL, false)
        ((HeaderViewHolder) holder).recyclerView.setLayoutManager(linearLayoutManager);

        if (((HeaderViewHolder) holder).recyclerView.getAdapter() == null){ //only create the adapter the first time. the following times update the values
            AnotherAdaterYouNeedToCreateForTheHorizontalRecyclerView adapter = new AnotherAdaterYouNeedToCreateForTheHorizontalRecyclerView(feedItems);
            ((HeaderViewHolder) holder).recyclerView.setAdapter(adapter);
        }else {
            ((HeaderViewHolder) holder).recyclerView.getAdapter().notifyDataSetChanged();
        }

    }else if (holder instanceof PostViewHolder){
        //just do the normal post binding
    }
}

@Override
public int getItemCount() {
    return posts.size() + 1; // +1 because of the header
}

@Override
public int getItemViewType(int position) {
    return position == 0 ? TYPE_HEADER : TYPE_POST;
}

private class HeaderViewHolder extends RecyclerView.ViewHolder{

    RecyclerView recyclerView;

    public HeaderViewHolder(View itemView) {
        super(itemView);
        recyclerView = itemView.findViewById(R.id.the_recycler_view_id_on_the_heaedr_layout_file);
    }
}

private class PostViewHolder extends RecyclerView.ViewHolder{

    ImageView imageView;

    public PostViewHolder(View itemView) {
        super(itemView);
        imageView = itemView.findViewById(R.id.post_image_view_or_whatever);
    }
}}

И така, вашият вертикален recyclerview има Post елементите (или каквото и да е вашият пост клас) начертани вертикално, това е лесното нещо за постигане. Сега, за хоризонталния изглед, трябва да внедрите заглавка на recyclerview (вижте моя пример за адаптер). Оформлението на заглавката ще има друг хоризонтален рециклиращ изглед.

Във вашето XML оформление опитайте да запазите изгледа за рециклиране на „заглавка“ и изгледа на рециклиращ инструмент „Публикуване“ във вложен изглед за превъртане. При мен работи.

    <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF">

    <androidx.core.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/tv"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:paddingStart="16dp"
                    android:paddingTop="8dp"
                    android:text="Welcome"
                    android:textAppearance="@style/TextAppearance.AppCompat.Large"
                    android:textColor="#000000"
                    android:textSize="24sp"
                    android:textStyle="bold" />

                <TextView
                    android:id="@+id/date"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:paddingStart="16dp"
                    android:paddingTop="8dp"
                    android:textAppearance="@style/TextAppearance.AppCompat.Body1"
                    android:textColor="@color/black_80" />

                <androidx.recyclerview.widget.RecyclerView
                    android:id="@+id/rv"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="8dp"
                    android:orientation="horizontal" />
            </LinearLayout>

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/rvv"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical" />

        </LinearLayout>
    </androidx.core.widget.NestedScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>