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 项目有问题.我按照 firebase GitHub 文档中的步骤操作，但出现此异常

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]

这是一个 ViewHolder 类，它不是内部类.

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);
    }
}

这是与firebase相关的代码

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);

我正在使用 firebaseRecyclerView 来填充数据模型，并且 viewHolder 类不是我活动的内部类

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

注意:当包含 recyclerView 的 Activity 启动时会发生异常.

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

推荐答案

很可能你的自定义 ViewHolder 子类是:

Most likely your custom ViewHolder subclass is:

• 缺少构造函数 public MyViewHolder(View itemView) {... } OR
• 该类定义在另一个类中，在这种情况下，您需要将其标记为 static public static class MyViewHolder.

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