firebaserecycleradapter() 不能应用于 FirebaseRecyclerAdapter

问题描述

谁能告诉我该特定行中的错误是什么.

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

这是显示的错误消息.

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);
        }
    }
}

链接到整个代码

推荐答案

FirebaseUI 的最新版本 (3.x) 实现了与以前版本不同的 FirebaseRecyclerAdapter 初始化方法.从使用 FirebaseRecyclerAdapter 文档:

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

首先，通过构建 FirebaseRecyclerOptions 来配置适配器.在在这种情况下，我们将继续我们的聊天示例:

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

接下来创建 FirebaseRecyclerAdapter 对象.你应该已经有一个 ViewHolder 子类用于显示每个项目.

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

因此，对于您的示例，您需要执行以下操作:

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
        // ...
    }
};

最后，FirebaseRecyclerAdapter 使用事件侦听器来监控 Firebase 查询的更改.要开始侦听数据，请调用 adapter.startListening() 和 adapter.stopListening() 以停止侦听器.建议分别在 onStart() 和 onStop() 中调用它们.详情请参见 FirebaseRecyclerAdapter 生命周期文档.

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.

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