图像未显示在ImageView中选项卡式活动的ViewPager内的Fragent-毕加索未替换占位符

问题描述

我有一个选项卡式活动，每个选项卡都包含一个带有recyclerView的片段。 recyclerView中的一个项目由带有文本的图像组成，两者均从Firebase实时数据库中获取。

一切似乎都正常，没有错误，但是当我运行该应用程序时，会提取并显示名称，而不显示图像。

here is the database structure from Firebase

here is the emulator displaying the name of the item but not replacing the placeholder with the image from the database

这是片段

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.linearlayoutmanager;
import androidx.recyclerview.widget.RecyclerView;

import com.andrei.bucatariadebuzunar.Clases.ImageUploadInfo;
import com.andrei.bucatariadebuzunar.Clases.ImageUploadInfoViewHolder;
import com.andrei.bucatariadebuzunar.R;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.squareup.picasso.Picasso;

public class FripturiFragment extends Fragment {


    public RecyclerView recyclerView;
    private DatabaseReference databaseReference;
    FirebaseRecyclerOptions<ImageUploadInfo> options;
    FirebaseRecyclerAdapter<ImageUploadInfo,ImageUploadInfoViewHolder>adapter;


    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_layout,container,false);
        databaseReference = FirebaseDatabase.getInstance().getReference().child("Recipes_Images").child("Fripturi");
        databaseReference.keepSynced(true);
        recyclerView = rootView.findViewById(R.id.recyclerViewRecipes);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new linearlayoutmanager(getContext()));

        LoadData();

        return rootView;
    }

    private void LoadData() {
        options = new FirebaseRecyclerOptions.Builder<ImageUploadInfo>().setQuery(databaseReference,ImageUploadInfo.class).build();
        adapter = new FirebaseRecyclerAdapter<ImageUploadInfo,ImageUploadInfoViewHolder>(options) {
            @Override
            protected void onBindViewHolder(@NonNull ImageUploadInfoViewHolder imageUploadInfoViewHolder,int position,@NonNull ImageUploadInfo model) {
                imageUploadInfoViewHolder.textView.setText(model.getimageName());
                Picasso.get().load(model.getimageURL()).placeholder(R.drawable.hat).into(imageUploadInfoViewHolder.imageView);
            }

            @NonNull
            @Override
            public ImageUploadInfoViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
                View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recipe_card_view,parent,false);
                return new ImageUploadInfoViewHolder(view);
            }
        };
        adapter.startListening();
        recyclerView.setAdapter(adapter);
    }
}

这是ImageUploadInfo类

public class ImageUploadInfo {

    public String imageName;
    public String imageURL;

    public ImageUploadInfo() {
    }


    public ImageUploadInfo(String imageName,String imageURL) {
        this.imageName = imageName;
        this.imageURL = imageURL;
    }

    public String getimageName() {
        return imageName;
    }
    public String getimageURL() {
        return imageURL;
    }

    public void setimageName(String imageName) {
        this.imageName = imageName;
    }

    public void setimageURL(String imageURL) {
        this.imageURL = imageURL;
    }
}

解决方法

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