public void onBindViewHolder(@NonNull final RecyclerView.ViewHolder holder, final int position) { if(getItemViewType(position)==0) { ((ItemViewHolder) holder).update(); //设置点击回调 if (mOnItemClickListener !=null){ holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mOnItemClickListener.onItemClick( holder.itemView,position); } }); } }else { ((FootViewHolder) holder).update(); } position报红

在你提供的代码中，`position`报红的原因可能是因为你的代码中没有在`onBindViewHolder`方法中声明`position`这个变量。你需要检查一下你的代码，看看是否有类似这样的声明：

int position = holder.getAdapterPosition();

如果没有，你需要加上这个声明，以便在方法中使用`position`这个变量。如果已经有这个声明了，那么可能是其他地方的问题导致的报错，你可以提供更多的上下文信息，让我能够更好地帮助你解决问题。

相关问题

public void onBindViewHolder(@NonNull final RecyclerView.ViewHolder holder, final int position) { if(getItemViewType(position)==0) { ((ItemViewHolder) holder).update(); //设置点击回调 if (mOnItemClickListener !=null){ holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mOnItemClickListener.onItemClick( holder.itemView,position); } }); } }else { ((FootViewHolder) holder).update(); } postiton报红

在你提供的代码中，`postiton`报红的原因是因为你在`onBindViewHolder`方法中使用了一个未声明的变量`postiton`，而实际上你想使用的是`position`。

正确的代码应该是这样的：

public void onBindViewHolder(@NonNull final RecyclerView.ViewHolder holder, final int position) {
    if(getItemViewType(position) == 0) {
        ((ItemViewHolder) holder).update();
        //设置点击回调
        if(mOnItemClickListener != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mOnItemClickListener.onItemClick(holder.itemView, position);
                }
            });
        }
    } else {
        ((FootViewHolder) holder).update();
    }
}

请注意，我只是将`postiton`改为了`position`，如果你在其他地方也有类似的错误，也需要进行相应的修改。

能否帮我完善下面代码中的点击项事件 ，显示短的toast .谢放。代码如下：package com.blog; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; import com.blog.R; public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.ViewHolder> { private String[] examples; public interface ViewHolderListener { void onItemClicked(View view, int adapterPosition); } private final ViewHolderListener viewHolderListener; public SimpleAdapter(String[] strs, ViewHolderListener viewHolderListener) { examples = strs; this.viewHolderListener = viewHolderListener; } @NonNull @Override public SimpleAdapter.ViewHolder onCreateViewHolder (@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()) .inflate(R.layout.list_item_layout, parent, false); return new SimpleAdapter.ViewHolder(view, viewHolderListener); } @Override public void onBindViewHolder(@NonNull SimpleAdapter.ViewHolder holder, int position) { holder.tvContent.setText(examples[position]); } @Override public int getItemCount() { return examples.length; } static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { private final TextView tvContent; private final ViewHolderListener viewHolderListener; ViewHolder(View itemView, ViewHolderListener viewHolderListener) { super(itemView); tvContent = itemView.findViewById(R.id.tv_content); this.viewHolderListener = viewHolderListener; itemView.findViewById(R.id.all_layout).setOnClickListener(this); } @Override public void onClick(View view) { if (null != viewHolderListener) { viewHolderListener.onItemClicked(view, getAdapterPosition()); } } } }

当用户点击列表项时，显示短时长的 Toast，你可以在 `ViewHolder` 类的 `onClick` 方法中添加以下代码：

@Override
public void onClick(View view) {
    if (null != viewHolderListener) {
        viewHolderListener.onItemClicked(view, getAdapterPosition());
        Toast.makeText(view.getContext(), "你点击了第 " + (getAdapterPosition() + 1) + " 个列表项", Toast.LENGTH_SHORT).show();
    }
}

这样，当用户点击列表项时，就会显示一个短时长的 Toast，提示用户点击了哪个列表项。完整的 `SimpleAdapter` 类如下：

package com.blog;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.blog.R;

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

    private String[] examples;

    public interface ViewHolderListener {
        void onItemClicked(View view, int adapterPosition);
    }

    private final ViewHolderListener viewHolderListener;

    public SimpleAdapter(String[] strs, ViewHolderListener viewHolderListener) {
        examples = strs;
        this.viewHolderListener = viewHolderListener;
    }

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

    @Override
    public void onBindViewHolder(@NonNull SimpleAdapter.ViewHolder holder, int position) {
        holder.tvContent.setText(examples[position]);
    }

    @Override
    public int getItemCount() {
        return examples.length;
    }

    static class ViewHolder extends RecyclerView.ViewHolder implements
            View.OnClickListener {

        private final TextView tvContent;
        private final ViewHolderListener viewHolderListener;

        ViewHolder(View itemView, ViewHolderListener viewHolderListener) {
            super(itemView);
            tvContent = itemView.findViewById(R.id.tv_content);
            this.viewHolderListener = viewHolderListener;
            itemView.findViewById(R.id.all_layout).setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (null != viewHolderListener) {
                viewHolderListener.onItemClicked(view, getAdapterPosition());
                Toast.makeText(view.getContext(), "你点击了第 " + (getAdapterPosition() + 1) + " 个列表项", Toast.LENGTH_SHORT).show();
            }
        }
    }
}