firebaserecycleradapter() cannot be applied to FirebaseRecyclerAdapter

问题

Can someone please tell what's the error in that specific line.

Here is the error message showing.

package com.example.souravkumar.sqaurewallpapers;

import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.squareup.picasso.Picasso;

/**
 * Created by Sourav Kumar on 11/3/2017.
 */

public class popular extends AppCompatActivity {

    private RecyclerView recyclerView;
    private DatabaseReference myRef;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        myRef = FirebaseDatabase.getInstance().getReference();
        FirebaseRecyclerAdapter<image_details, BlogViewHolder> adapter = new FirebaseRecyclerAdapter<image_details, BlogViewHolder>(
                image_details.class,
                R.layout.individual_row,

                myRef) {
            @Override
            protected void onBindViewHolder(BlogViewHolder holder, int position, image_details model) {
                holder.setDate(model.getDate());
                holder.setUrl(model.getUrl());
            }

            @Override
            public BlogViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                return null;
            }
        };

        recyclerView.setAdapter(adapter);

    }

    public static  class BlogViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        ImageView imageView;
        public BlogViewHolder(View itemView) {
            super(itemView);
            textView = (TextView)itemView.findViewById(R.id.date);
            imageView = (ImageView)itemView.findViewById(R.id.imageView);
        }

        public void setDate(Long date) {
            textView.setText(date.toString());
        }

        public void setUrl(String url) {
            Picasso.with(itemView.getContext())
                    .load(url)
                    .resize(50, 50)
                    .centerCrop()
                    .into(imageView);
        }
    }
}

Link to the whole code

回答1:

The latest version (3.x) of FirebaseUI implements a different method of initializing a FirebaseRecyclerAdapter than previous versions. From the using the FirebaseRecyclerAdapter documentation:

First, configure the adapter by building FirebaseRecyclerOptions. In this case we will continue with our chat example:

 FirebaseRecyclerOptions<Chat> options =
                new FirebaseRecyclerOptions.Builder<Chat>()
                        .setQuery(query, Chat.class)
                        .build();

Next create the FirebaseRecyclerAdapter object. You should already have a ViewHolder subclass for displaying each item.

So, for your example, you'll need to do something similar to:

FirebaseRecyclerOptions<image_details> options =
        new FirebaseRecyclerOptions.Builder<image_details>()
                .setQuery(myRef, image_details.class)
                .build();

FirebaseRecyclerAdapter adapter = new FirebaseRecyclerAdapter<image_details, BlogViewHolder>(options) {
    @Override
    public BlogViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.individual_row, parent, false);

        return new BlogViewHolder(view);
    }

    @Override
    protected void onBindViewHolder(BlogViewHolder holder, int position, image_details model) {
        // Bind the image_details object to the BlogViewHolder
        // ...
    }
};

Finally, the FirebaseRecyclerAdapter uses an event listener to monitor changes to the Firebase query. To begin listening for data, call adapter.startListening() and adapter.stopListening() to stop the listener. It's recommended to call these in onStart() and onStop() respectively. Further details on this are available in the FirebaseRecyclerAdapter lifecycle documentation.

回答2:

You missed a method to start the activity. Add this in onStart() method:

firebaseRecyclerAdapter.startListening();

回答3:

Hello your error is due to a missing argument in these () that are found beside this

<image_details, BlogViewHolder>

so you missed one more argument of your BlogViewHolder class so I will add the piece of code and refer your missing argument by a comment in this :

FirebaseRecyclerAdapter<image_details, BlogViewHolder> adapter = new FirebaseRecyclerAdapter<image_details, BlogViewHolder>(
            image_details.class,
            R.layout.individual_row,
            BlogViewHolder.class //see this is missing so you should add it       
            myRef) {

回答4:

This is the right way :

FirebaseRecyclerOptions<image_details> options =
    new FirebaseRecyclerOptions.Builder<image_details>()
            .setQuery(myRef, image_details.class)
            .build();

FirebaseRecyclerAdapter adapter = new FirebaseRecyclerAdapter<image_details, BlogViewHolder>(options) {
    @Override
    public BlogViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.individual_row, parent, false);

        return new BlogViewHolder(view);
    }

    @Override
    protected void onBindViewHolder(BlogViewHolder holder, int position, image_details model) {
        // Bind the image_details object to the BlogViewHolder
        // ...
    }
};

回答5:

I had the same error and this worked very well for me. Hope it helps someone

//loads data into recycler view onstart up
@Override
protected void onStart() {
    super.onStart();

    FirebaseRecyclerOptions<Data> options =
            new FirebaseRecyclerOptions.Builder<Data>()
                    .setQuery(dbReference, Data.class)
                    .build();

    FirebaseRecyclerAdapter firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Data, DataViewHolder>(options) {
        @Override
        public DataViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.row, parent, false);

            return new DataViewHolder(view);
        }

        @Override
        protected void onBindViewHolder(@NonNull DataViewHolder holder, int position, @NonNull Data model) {
            // Bind the image_details object to the BlogViewHolder
            // ...
            holder.setDetails(getApplicationContext(), model.getName(), model.getDepartment(), model.getDescription());
        }
    };



    firebaseRecyclerAdapter.startListening();
    recyclerView.setAdapter(firebaseRecyclerAdapter);

}

来源：https://stackoverflow.com/questions/47091837/firebaserecycleradapter-cannot-be-applied-to-firebaserecycleradapter