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我的布局有 3 个 Recyclerview。第一个和第二个是Vertical，第三个是Horizontal。因为我需要显示3个Recyclerview，所以我必须使用NestedScrollView它们来包装它们。NestedScrollView + Recyclerview是一件坏事，即使没有多少数据。喜欢： 在此处输入图像描述

我想做的是将3个Recyclerviews合并为一个Recyclerview.Like： 在此处输入图像描述

我尝试使用ConcatAdapter，但它似乎并不满足我。因为：

这是使用NestedScrollView：在此处输入图像描述

这是使用ConcatAdapter：在此处输入图像描述

是的，ConcatAdapter 不符合我的要求，因为每个 Recyclerview 都有不同的外包装。

使用 ConcatAdapter 应该怎么做？

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1 回答 1

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儿童 Recyclerview 适配器

public class ChildRecyclerViewAdapter extends 
     RecyclerView.Adapter<ChildRecyclerViewAdapter.MyViewHolder> {
     public ArrayList<ChildModel> childModelArrayList;
     Context cxt;

public static class MyViewHolder extends RecyclerView.ViewHolder{
    public ImageView heroImage;
    public TextView movieName;

    public MyViewHolder(View itemView) {
        super(itemView);
        heroImage = itemView.findViewById(R.id.hero_image);
        movieName = itemView.findViewById(R.id.movie_name);
    }
}

public ChildRecyclerViewAdapter(ArrayList<ChildModel> arrayList, Context mContext) {
    this.cxt = mContext;
    this.childModelArrayList = arrayList;
}

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

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    ChildModel currentItem = childModelArrayList.get(position);
    holder.heroImage.setImageResource(currentItem.getHeroImage());
    holder.movieName.setText(currentItem.getMovieName());

}

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

父 Recyclerview 适配器

 public class ParentRecyclerViewAdapter extends 
     RecyclerView.Adapter<ParentRecyclerViewAdapter.MyViewHolder> {
     private ArrayList<ParentModel> parentModelArrayList;
     public Context cxt;

public static class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView category;
    public RecyclerView childRecyclerView;

    public MyViewHolder(View itemView) {
        super(itemView);

        category = itemView.findViewById(R.id.Movie_category);
        childRecyclerView = itemView.findViewById(R.id.Child_RV);
    }
}

public ParentRecyclerViewAdapter(ArrayList<ParentModel> exampleList, Context context) {
    this.parentModelArrayList = exampleList;
    this.cxt = context;

}

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

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

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

    ParentModel currentItem = parentModelArrayList.get(position);
    RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(cxt, LinearLayoutManager.HORIZONTAL, false);
    holder.childRecyclerView.setLayoutManager(layoutManager);
    holder.childRecyclerView.setHasFixedSize(true);

    holder.category.setText(currentItem.movieCategory());
    ArrayList<ChildModel> arrayList = new ArrayList<>();

    // added the first child row
    if (parentModelArrayList.get(position).movieCategory().equals("Category1")) {
        arrayList.add(new ChildModel(R.drawable.themartian,"Movie Name"));
        arrayList.add(new ChildModel(R.drawable.moana,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.mov2,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.blackp,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.moviedubbedinhindi2,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood1,"Movie Name"));
    }

    // added in second child row
    if (parentModelArrayList.get(position).movieCategory().equals("Category2")) {
        arrayList.add(new ChildModel(R.drawable.moviedubbedinhindi2,"Movie Name"));
        arrayList.add(new ChildModel(R.drawable.moviedubbedinhindi3,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.moviedubbedinhindi1,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.moviedubbedinhindi4,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.moviedubbedinhindi5,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.moviedubbedinhindi6,"Movie Name"));
    }

    // added in third child row
    if (parentModelArrayList.get(position).movieCategory().equals("Category3")) {
        arrayList.add(new ChildModel(R.drawable.hollywood6,"Movie Name"));
        arrayList.add(new ChildModel(R.drawable.hollywood5,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood4,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood3,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood2,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood1,"Movie Name"));
    }

    // added in fourth child row
    if (parentModelArrayList.get(position).movieCategory().equals("Category4")) {
        arrayList.add(new ChildModel(R.drawable.bestofoscar6,"Movie Name"));
        arrayList.add(new ChildModel(R.drawable.bestofoscar5,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.bestofoscar4,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.bestofoscar3,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.bestofoscar2,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.bestofoscar1,"Movie Name"));
    }

    // added in fifth child row
    if (parentModelArrayList.get(position).movieCategory().equals("Category5")) {
        arrayList.add(new ChildModel( R.drawable.moviedubbedinhindi4,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood2,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.bestofoscar4,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.mov2,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood1,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.bestofoscar1,"Movie Name"));
    }

    // added in sixth child row
    if (parentModelArrayList.get(position).movieCategory().equals("Category6")) {
        arrayList.add(new ChildModel(R.drawable.hollywood5,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.blackp,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.bestofoscar4,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.moviedubbedinhindi6,"Movie Name"));
        arrayList.add(new ChildModel( R.drawable.hollywood1,"Movie Name"));
        arrayList.add(new ChildModel(R.drawable.bestofoscar6,"Movie Name"));
    }

    ChildRecyclerViewAdapter childRecyclerViewAdapter = new ChildRecyclerViewAdapter(arrayList,holder.childRecyclerView.getContext());
        holder.childRecyclerView.setAdapter(childRecyclerViewAdapter);
    }
 }

MainActivity.java

public class MainActivity extends AppCompatActivity {
  private RecyclerView parentRecyclerView;
  private RecyclerView.Adapter ParentAdapter;
  ArrayList<ParentModel> parentModelArrayList = new ArrayList<>();
  private RecyclerView.LayoutManager parentLayoutManager;


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

    //set the Categories for each array list set in the `ParentViewHolder`
    parentModelArrayList.add(new ParentModel("Category1"));
    parentModelArrayList.add(new ParentModel("Category2"));
    parentModelArrayList.add(new ParentModel("Category3"));
    parentModelArrayList.add(new ParentModel("Category4"));
    parentModelArrayList.add(new ParentModel("Category5"));
    parentModelArrayList.add(new ParentModel("Category6"));
    parentRecyclerView = findViewById(R.id.Parent_recyclerView);
    parentRecyclerView.setHasFixedSize(true);
    parentLayoutManager = new LinearLayoutManager(this);
    ParentAdapter = new ParentRecyclerViewAdapter(parentModelArrayList, MainActivity.this);
    parentRecyclerView.setLayoutManager(parentLayoutManager);
    parentRecyclerView.setAdapter(ParentAdapter);
    ParentAdapter.notifyDataSetChanged();
}

}

于 2021-08-05T17:47:05.350 回答