添加View将RecyclerView作为父级，但视图不是真正的孩子

2 回答

• 0

  我遇到了同样的问题......我通过使用 Context 从 parent.getContext() 充气 ViewHolder 并在 inflate 的调用中指定 false 解决了这个问题：

  final override fun onCreateViewHolder(parent:ViewGroup,viewType:Int):RecyclerView.ViewHolder
  {
      View view = LayoutInflater.from(parent.getContext())
          .inflate(R.layout.listitem,parent,false);
      return new RecyclerView.ViewHolder(view) {};
  }
  

  回复于 2024-05-03T14:54:05+08:00
• 0

  我们实际通过编写自己的适配器解决它：

  public abstract class BaseRVAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
  
      static final int HEADER_VIEW_TYPE = Integer.MAX_VALUE;
      static final int FOOTER_VIEW_TYPE = Integer.MAX_VALUE - 1;
  
      private BaseRVAdapterHeaderImpl adapterHeader;
  
      private BaseRVAdapterFooterImpl adapterFooter;
  
      public void setFooterImpl(BaseRVAdapterFooterImpl footerImpl) {
          adapterFooter = footerImpl;
      }
  
      public void setHeaderImpl(BaseRVAdapterHeaderImpl headerImpl) {
          adapterHeader = headerImpl;
      }
  
      public abstract RecyclerView.ViewHolder onCreateContentItemViewHolder(ViewGroup parent, int viewType);
  
      public abstract void onBindContentItemViewHolder(RecyclerView.ViewHolder holder, int position);
  
      public abstract int getContentItemCount();
  
      public int getContentItemViewType(int position) {
          return 0;
      }
  
      @Override
      public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
          if (viewType == HEADER_VIEW_TYPE) {
              return new HeaderViewHolder(adapterHeader.getHeaderView());
          }
  
          if (viewType == FOOTER_VIEW_TYPE) {
              return new FooterViewHolder(adapterFooter.getFooterView());
          }
  
          return onCreateContentItemViewHolder(parent, viewType);
      }
  
      @Override
      public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
          if (holder instanceof HeaderViewHolder) {
              //bind header view holder
          } else if (holder instanceof FooterViewHolder) {
              adapterFooter.onBind(holder.itemView);
          } else {
              onBindContentItemViewHolder(holder, position - getHeaderItemCount());
          }
      }
  
      @Override
      public int getItemCount() {
          return getContentItemCount() + getHeaderItemCount() + getFooterItemCount();
      }
  
      @Override
      public int getItemViewType(int position) {
          if (hasHeader() && position < getHeaderItemCount()) {
              return HEADER_VIEW_TYPE;
          }
  
          if (position == getItemCount() - 1 && hasFooter()) {
              return FOOTER_VIEW_TYPE;
          }
  
          return getContentItemViewType(position - getHeaderItemCount());
      }
  
      public int getAdapterContentPosition(RecyclerView.ViewHolder holder) {
          return holder.getAdapterPosition() - getHeaderItemCount();
      }
  
      public void notifyContentItemRangeInserted(int positionStart, int itemCount) {
          notifyItemRangeInserted(positionStart + getHeaderItemCount(), itemCount);
      }
  
      public void notifyContentItemRangeRemoved(int positionStart, int itemCount) {
          notifyItemRangeRemoved(positionStart + getHeaderItemCount(), itemCount);
      }
  
      public void notifyContentItemRemoved(int position) {
          notifyItemRemoved(position + getHeaderItemCount());
      }
  
      public void notifyContentItemChanged(int position) {
          notifyItemChanged(position + getHeaderItemCount());
      }
  
      public void notifyFooterItemChanged() {
          notifyItemChanged(getContentItemCount() + getFooterItemCount());
      }
  
      public boolean hasHeader() {
          return adapterHeader != null;
      }
  
      boolean hasFooter() {
          return adapterFooter != null;
      }
  
      public int getHeaderItemCount() {
          return hasHeader() ? 1 : 0;
      }
  
      public int getFooterItemCount() {
          return hasFooter() ? 1 : 0;
      }
  
      public interface BaseRVAdapterHeaderImpl {
          View getHeaderView();
      }
  
      public static abstract class BaseRVAdapterFooterImpl {
          public abstract View getFooterView();
  
          public void onBind(View view) {
  
          }
      }
  
      private class HeaderViewHolder extends RecyclerView.ViewHolder {
          HeaderViewHolder(View itemView) {
              super(itemView);
          }
      }
  
      private class FooterViewHolder extends RecyclerView.ViewHolder {
          FooterViewHolder(View itemView) {
              super(itemView);
          }
      }
  
      public RecyclerView.ItemDecoration getBottomItemDecoration() {
          int marginBottom = App.getContext().getResources().getDimensionPixelSize(R.dimen.dimen_small);
  
          return new RecyclerView.ItemDecoration() {
              @Override
              public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
                  super.getItemOffsets(outRect, view, parent, state);
  
                  int position = parent.getChildAdapterPosition(view);
                  int contentItemCount = getContentItemCount();
                  if (position == contentItemCount) {
                      outRect.bottom = marginBottom;
                  }
              }
          };
      }
  }
  

  回复于 2024-05-03T14:54:05+08:00