getSnapshots()不适用于firestore分页适配器

Question

我是android开发的新手，无法解决为什么getSnapshots()不适用于分页适配器，尽管它适用于回收器适配器。

package com.applex.spectrumbiocides;
import android.net.Uri;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import com.firebase.ui.firestore.paging.FirestorePagingAdapter;
import com.firebase.ui.firestore.paging.FirestorePagingOptions;
import com.firebase.ui.firestore.paging.LoadingState;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestoreException;
import com.squareup.picasso.Picasso;
import java.util.Objects;
public class InventoryFirestoreAdaptor extends FirestorePagingAdapter<Inventory, InventoryFirestoreAdaptor.Products_view_holder> {
private onItemClickListener listener;

/*
*
* Create a new RecyclerView adapter that listens to a Firestore Query.  See {@link
* FirestoreRecyclerOptions} for configuration options.
*
* @param options
*/
public InventoryFirestoreAdaptor(@NonNull FirestorePagingOptions<Inventory> options) {
super(options);
}
@Override
protected void onBindViewHolder(@NonNull Products_view_holder holder, int position, @NonNull Inventory model) {
holder.item_name.setText(model.getName());
holder.item_description.setText("Description: " + model.getDescription());
holder.item_price.setText("Price: ₹" + model.getPrice());
holder.item_discount.setText("Discount: " + model.getDiscount() + " %");
holder.item_stock.setText("Stocks available: " + model.getStock());
//holder.item_img.setImageURI(Uri.parse(model.getImage_URL()));
//adding the image.
Picasso.get()
.load(model.getImage_URL())
.fit()
.centerCrop()
.into(holder.item_img);
}
@NonNull
@Override
public Products_view_holder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.inventory_single_item, parent ,false);
return new Products_view_holder(view);
}
/*
@Override
public void onError(FirebaseFirestoreException e){
Log.e("error", Objects.requireNonNull(e.getMessage()));
}
*/


// view holder class.....
public class Products_view_holder extends RecyclerView.ViewHolder {
private final TextView item_name;
//private TextView item_category;
private final TextView item_description;
private final TextView item_price;
private final TextView item_discount;
private final TextView item_stock;
private final ImageView item_img;

public Products_view_holder(@NonNull View itemView) {
super(itemView);
//item_name = itemView.findViewById(R.id.iname);
item_name = itemView.findViewById(R.id.item_name);
//item_category = findViewById(R.id.item_category);
item_description = itemView.findViewById(R.id.item_description);
item_price = itemView.findViewById(R.id.item_price);
item_discount = itemView.findViewById(R.id.item_discount);
item_stock = itemView.findViewById(R.id.item_stock);
item_img = itemView.findViewById(R.id.item_image);

itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION && listener != null){
listener.onItemClick(getSnapshots().getSnapshot(position),position);
}
//To sent a click from the adapter class to the underling activity an interface needs to be declared!!
}
});
}
}

public interface  onItemClickListener{
void onItemClick(DocumentSnapshot documentSnapshot, int position);
}
public void setOnItemCLickListener(onItemClickListener listener){
this.listener = listener;
}

}

它只是说无法解析getSnapshot()！！！

错误：找不到符号listener.oItemClick(getSnapshots().getSnapshot(position)，position)；^symbol：方法getSnapshots()

Answer 1

哦，我刚刚解决了！！

代替：

listener.onItemClick(getSnapshots().getSnapshot(position),position);

它需要：

listener.onItemClick(getItem(getAdapterPosition()), position);

不过，对于一个简单的回收器适配器，上面一行可以很好地获取文档的快照。