尝试使用毕加索显示FirebaseFirestore中的图像时出错

问题描述

我正在尝试显示来自firebasefirestore的图像和文本。文本显示得很好，但是我一直试图显示图像。显示图像的正确方法是什么，因为我遵循的教程似乎不正确或丢失了某些内容 我尝试寻找一些答案，但并没有得到足够的帮助 下面是我的主要活动和模型类

主要活动

package com.example.tutorscape;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.linearlayoutmanager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;
import com.squareup.picasso.Picasso;

public class MainActivity extends AppCompatActivity {

    private RecyclerView mFirebaseList;
    private FirebaseFirestore firebaseFirestore;

    private FirestoreRecyclerAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        firebaseFirestore=FirebaseFirestore.getInstance();
        mFirebaseList= findViewById(R.id.recyclerView);


        Query query = firebaseFirestore.collection("Admin");


        FirestoreRecyclerOptions<Model> options = new FirestoreRecyclerOptions.Builder<Model>()
                .setQuery(query,Model.class)
                .build();
         adapter= new FirestoreRecyclerAdapter<Model,MyViewHolder>(options) {
            @NonNull
            @Override
            public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
               View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item,parent,false);

                return new MyViewHolder(view);
            }

            @Override
            protected void onBindViewHolder(@NonNull MyViewHolder holder,int position,@NonNull Model model) {


                 holder.list_name.setText(model.getName());
                 holder.list_title.setText(model.getTitle());
              //  Picasso.get().load(model.getimage()).into(imageView);


             }
        };


        mFirebaseList.setHasFixedSize(true);
        mFirebaseList.setLayoutManager(new linearlayoutmanager(this));
        mFirebaseList.setAdapter(adapter);

    }
    private class MyViewHolder extends RecyclerView.ViewHolder{

        private TextView list_name;
        private TextView list_title;
      //  private ImageView imageView;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);

            list_name=itemView.findViewById(R.id.textViewName);
            list_title=itemView.findViewById(R.id.textViewTitle);
       //     imageView=itemView.findViewById(R.id.imageView);

        }
    }


    @Override
    protected void onStart() {
        super.onStart();
        adapter.startListening();
    }

    @Override
    protected void onStop() {
        super.onStop();
        adapter.stopListening();
    }
}

模型类

package com.example.tutorscape;

public class Model {
    private String name;
    private String title;

    private String image;
    private Model(){}

    public Model(String name,String title,String image) {
        this.name = name;
        this.title = title;
        this.image=image;
    }
    public String getimage() {
        return image;
    }

    public void setimage(String image) {
        this.image = image;
    }
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

图片的网址在浏览器中可以很好地打开

解决方法

取消注释所有内容并在此将imageView删除到holder.imageView Picasso.get（）。load（model.getImage（））。into（imageView）

,

我认为您必须像这样致电Picasso，

Picasso.get().load(model.getImage()).into(holder.imageView);

就像调用holder.list_name来设置文本一样。

取消注释这些行，这是正确的。

private ImageView imageView;

imageView=itemView.findViewById(R.id.imageView);

希望它现在可以工作！