导致此异常的原因java.lang.RuntimeException：java.lang.NoSuchMethodException：< init> [类android.view.View] [英] What causing this exception java.lang.RuntimeException: java.lang.NoSuchMethodException: <init> [class android.view.View]

问题描述

我的 firebase 项目存在问题。
我遵循 firebase GitHub文档上的步骤，但是我得到了这个异常

  java.lang.RuntimeException：java.lang.NoSuchMethodException：< init> 
 [class android.view.View] 
  

这是一个

  public class ProductViewHolder extends RecyclerView.ViewHolder {
 public View mView; 
 public ImageView img; 
公共TextView标题; 
 public TextView价格; 
公开评级吧明星; 
 
 
 ProductViewHolder（查看itemView）{
 super（itemView）; 
 
 mView = itemView; 
 img =（ImageView）itemView.findViewById（R.id.productImg）; 
 title =（TextView）itemView.findViewById（R.id.txtTitle）; 
 price =（TextView）itemView.findViewById（R.id.txtPrice）; 
 stars =（RatingBar）itemView.findViewById（R.id.ratingBar）; 
} 
} 
  

这是firebase相关代码



$ $ $ $ $ $ $ $ $ $ $保护无效onStart（）{
super.onStart（）;

//回收站适配器
FirebaseRecyclerAdapter< Product，ProductViewHolder> adapter =
FirebaseRecyclerAdapter< Product，ProductViewHolder>（
Product.class，
ProductViewHolder.class，
firebaseRef.child（product ））{

@Override
protected void populateViewHolder（ProductViewHolder productViewHolder，Product product，int i）{
Picasso.with（ShopsApp.getLyShopsAppContext（））
.load（product.getImgUrl（））
.placeholder（R.drawable.none）
.into（productViewHolder.img）;
productViewHolder.title.setText（product.getTitle（））;
productViewHolder.price.setText（product.getPrice（））;
productViewHolder.stars.setRating（4.0f）;
}
};

recyclerView1.setAdapter（adapter）;


我使用 firebaseRecyclerView 来填充数据
和 viewHolder 类不是我的活动的内部类。当包含 recyclerView 的活动启动时会发生异常。

解决方案

很可能您的自定义 ViewHolder 子类是：

• 缺少构造函数 public MyViewHolder（View itemView）{...} OR


• 类是在另一个类中定义的，在这种情况下，将其标记为静态 public static class MyViewHolder 。

I'm having a problem with my firebase project. I followed the steps on firebase GitHub documentation, but I got this exception

java.lang.RuntimeException: java.lang.NoSuchMethodException: <init>
[class android.view.View]

this is a ViewHolder class which is not an inner class.

public class ProductViewHolder extends RecyclerView.ViewHolder{
public View mView;
public ImageView img;
public TextView title;
public TextView price;
public RatingBar stars;


ProductViewHolder(View itemView) {
    super(itemView);

    mView = itemView;
    img = (ImageView) itemView.findViewById(R.id.productImg);
    title = (TextView) itemView.findViewById(R.id.txtTitle);
    price = (TextView) itemView.findViewById(R.id.txtPrice);
    stars = (RatingBar) itemView.findViewById(R.id.ratingBar);
    }
}

and this is the firebase related code

@Override
protected void onStart() {
    super.onStart();

    // Recycler adapter
    FirebaseRecyclerAdapter<Product, ProductViewHolder> adapter =
            new FirebaseRecyclerAdapter<Product, ProductViewHolder>(
                    Product.class,
                    R.layout.product_list_item,
                    ProductViewHolder.class,
                    firebaseRef.child("product")) {

                @Override
                protected void populateViewHolder(ProductViewHolder productViewHolder, Product product, int i) {
                    Picasso.with(ShopsApp.getLyShopsAppContext())
                            .load(product.getImgUrl())
                            .placeholder(R.drawable.none)
                            .into(productViewHolder.img);
                    productViewHolder.title.setText(product.getTitle());
                    productViewHolder.price.setText(product.getPrice());
                    productViewHolder.stars.setRating(4.0f);
                }
            };

    recyclerView1.setAdapter(adapter);

I'm using firebaseRecyclerView to populate data model, and the viewHolder class is not inner class of my activity

Note: the exception occurs when the activity that contains the recyclerView starts.

解决方案

Most likely your custom ViewHolder subclass is:

• missing a constructor public MyViewHolder(View itemView) {... } OR
• the class is defined inside another class, in which case you need to mark it as static public static class MyViewHolder.

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