构建应用程序时RecyclerView适配器中的错误

我添加了RecyclerView及其适配器，但是当我构建该应用程序时，它会在Android Studio的消息视图中显示构建错误。它指出了我创建的RecycleAdapter中的错误。构建应用程序时RecyclerView适配器中的错误

Error:(63, 12) error: cannot access ScrollingView 
class file for android.support.v4.view.ScrollingView not found 

Error:(20, 8) error: cannot access NestedScrollingChild 
class file for android.support.v4.view.NestedScrollingChild not found 

Error:(20, 88) error: type argument CategoryRecycleAdapter.ViewHolder is not within bounds of type-variable VH 

where VH is a type-variable: 
VH extends android.support.v7.widget.RecyclerView.ViewHolder declared in class Adapter 
Error:(30, 9) error: cannot find symbol variable this 

Error:(31, 9) error: cannot find symbol variable this 

Error:(34, 5) error: method does not override or implement a method from a supertype 

Error:(37, 16) error: an enclosing instance that contains CategoryRecycleAdapter.ViewHolder is required 

Error:(40, 5) error: method does not override or implement a method from a supertype 
Error:(55, 9) error: cannot find symbol method notifyDataSetChanged() 

Error:(58, 5) error: method does not override or implement a method from a supertype

这里是适配器的代码：

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

Context mContext; 
ArrayList<Category> alData; 


public CategoryRecycleAdapter() { 
} 

public CategoryRecycleAdapter(Context mContext, ArrayList<Category> alData) { 
    this.mContext = mContext; 
    this.alData = alData; 
} 

@Override 
public CategoryRecycleAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View view = LayoutInflater.from(mContext).inflate(R.layout.row_category, parent, false); 
    return new CategoryRecycleAdapter.ViewHolder(view); 
} 

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

    holder.tvName.setText("" + alData.get(position).displayName); 
    Picasso.with(mContext) 
      .load(alData.get(position).iconUrl) 
      .into(holder.ivCategory); 

} 

public void addAll(ArrayList<Category> data) { 
    if (data != null) { 
     alData.clear(); 
     alData.addAll(data); 
    } 
    notifyDataSetChanged(); 
} 

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

public class ViewHolder extends RecyclerView.ViewHolder { 
    TextView tvName; 
    ImageView ivCategory; 

    public ViewHolder(View itemView) { 
     super(itemView); 
     tvName = (TextView) itemView.findViewById(R.id.tvCategory); 
     ivCategory = (ImageView) itemView.findViewById(R.id.ivCategory); 
    } 
}}

来源

2016-06-28 Asif Patel

我相信这行是你的罪魁祸首：

public class CategoryRecycleAdapter extends RecyclerView.Adapter<CategoryRecycleAdapter.ViewHolder>

你引用的类CategoryRecycleAdapter的基本ViewHolder。尝试扩展您声明为私有内部类的ViewHolder。

public class ViewHolder extends RecyclerView.ViewHolder

使这个版本，让我知道，如果它不工作：

public class CategoryRecycleAdapter extends RecyclerView.Adapter<ViewHolder>

来源

2016-06-28 19:53:15 apelsoczi

使用您的建议时出现同样的错误。 –

进行这些更改您的代码：

public class CategoryRecycleAdapter extends RecyclerView.Adapter< RecyclerView.ViewHolder>

和

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

和

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

变化onCreateViewHolder从CategoryRecycleAdapter.ViewHolder的返回类型RecyclerView.ViewHolder

这应该解决的问题。

来源

2016-06-28 20:19:58

构建应用程序时RecyclerView适配器中的错误

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