Picasso 上传后不加载图像，甚至将对象保存在 firebase 中

如何解决Picasso 上传后不加载图像，甚至将对象保存在 firebase 中

这是布局代码-

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".DealActivity">


    <EditText
        android:id="@+id/txtTitle"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/text_margin_standard"
        android:layout_marginTop="@dimen/text_margin_large"
        android:layout_marginEnd="@dimen/text_margin_standard"
        android:hint="@string/title_hint"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/txtPrice"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/text_margin_standard"
        android:layout_marginTop="@dimen/text_margin_standard"
        android:layout_marginEnd="@dimen/text_margin_standard"
        android:inputType="numberDecimal"
        android:hint="@string/price_hint"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtTitle" />

    <EditText
        android:id="@+id/txtDescription"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/text_margin_standard"
        android:layout_marginTop="@dimen/text_margin_standard"
        android:layout_marginEnd="@dimen/text_margin_standard"
        android:hint="@string/description_hint"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtPrice" />

    <Button
        android:id="@+id/btnImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/text_margin_standard"
        android:layout_marginTop="@dimen/text_margin_standard"
        android:layout_marginEnd="@dimen/text_margin_standard"
        android:text="@string/upload_image"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtDescription" />

    <ImageView
        android:id="@+id/image"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="@dimen/text_margin_standard"
        android:layout_marginTop="@dimen/text_margin_standard"
        android:layout_marginEnd="@dimen/text_margin_standard"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnImage"
        app:srcCompat="@android:color/transparent" />
</androidx.constraintlayout.widget.ConstraintLayout>

这是Java代码-

package com.example.travelmantics;

import android.content.Intent;
import android.content.res.Resources;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import com.squareup.picasso.Picasso;

public class DealActivity extends AppCompatActivity {
    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference mDatabaseReference;
    private static final int PICTURE_RESULT = 42; //the answer to everything
    EditText txtTitle;
    EditText txtDescription;
    EditText txtPrice;
    ImageView imageView;
    TravelDeal deal;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_deal);
        mFirebaseDatabase = FirebaseUtil.mFirebaseDatabase;
        mDatabaseReference = FirebaseUtil.mDatabaseReference;
        txtTitle = (EditText) findViewById(R.id.txtTitle);
        txtDescription = (EditText) findViewById(R.id.txtDescription);
        txtPrice = (EditText) findViewById(R.id.txtPrice);
        imageView = (ImageView) findViewById(R.id.image);
        Intent intent = getIntent();
        TravelDeal deal = (TravelDeal) intent.getSerializableExtra("Deal");
        if (deal==null) {
            deal = new TravelDeal();
        }
        this.deal = deal;
        txtTitle.setText(deal.getTitle());
        txtDescription.setText(deal.getDescription());
        txtPrice.setText(deal.getPrice());
        showImage(deal.getimageUrl());
        Button btnImage = findViewById(R.id.btnImage);
        btnImage.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.setType("image/jpeg");
                intent.putExtra(Intent.EXTRA_LOCAL_ONLY,true);
                startActivityForResult(intent.createChooser(intent,"Insert Picture"),PICTURE_RESULT);
            }
        });
    }
    @Override
    public boolean onoptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.save_menu:
                saveDeal();
                Toast.makeText(this,"Deal saved",Toast.LENGTH_LONG).show();
                clean();
                backToList();
                return true;
            case R.id.delete_menu:
                deleteDeal();
                Toast.makeText(this,"Deal Deleted",Toast.LENGTH_LONG).show();
                backToList();
                return true;
            default:
                return super.onoptionsItemSelected(item);

        }

    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.save_menu,menu);
        if (FirebaseUtil.isAdmin) {
            menu.findItem(R.id.delete_menu).setVisible(true);
            menu.findItem(R.id.save_menu).setVisible(true);
            enableEditTexts(true);
        }
        else {
            menu.findItem(R.id.delete_menu).setVisible(false);
            menu.findItem(R.id.save_menu).setVisible(false);
            enableEditTexts(false);
        }


        return true;
    }

    @Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data) {
        super.onActivityResult(requestCode,resultCode,data);
        if (requestCode == PICTURE_RESULT && resultCode == RESULT_OK) {
            Uri imageUri = data.getData();
            final StorageReference ref = FirebaseUtil.mStorageRef.child(imageUri.getLastPathSegment());
            ref.putFile(imageUri).addOnSuccessListener(this,new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                    String url = ref.getDownloadUrl().toString();
                    //String url = taskSnapshot.getDownloadUrl().toString();
                    String pictureName = taskSnapshot.getStorage().getPath();
                    deal.setimageUrl(url);
                    deal.setimageName(pictureName);
                    Log.d("Url: ",url);
                    Log.d("Name",pictureName);
                    showImage(url);
                }
            });

        }
    }

    private void saveDeal() {
        deal.setTitle(txtTitle.getText().toString());
        deal.setDescription(txtDescription.getText().toString());
        deal.setPrice(txtPrice.getText().toString());
        if(deal.getId()==null) {
            mDatabaseReference.push().setValue(deal);
        }
        else {
            mDatabaseReference.child(deal.getId()).setValue(deal);
        }
    }
    private void deleteDeal() {
        if (deal == null) {
            Toast.makeText(this,"Please save the deal before deleting",Toast.LENGTH_SHORT).show();
            return;
        }
        mDatabaseReference.child(deal.getId()).removeValue();
        Log.d("image name",deal.getimageName());
        if(deal.getimageName() != null && deal.getimageName().isEmpty() == false) {
            StorageReference picRef = FirebaseUtil.mStorage.getReference().child(deal.getimageName());
            picRef.delete().addOnSuccessListener(new OnSuccessListener<Void>() {
                @Override
                public void onSuccess(Void aVoid) {
                    Log.d("Delete Image","Image Successfully Deleted");
                }
            }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Log.d("Delete Image",e.getMessage());
                }
            });
        }

    }
    private void backToList() {
        Intent intent = new Intent(this,ListActivity.class);
        startActivity(intent);
    }
    private void clean() {
        txtTitle.setText("");
        txtPrice.setText("");
        txtDescription.setText("");
        txtTitle.requestFocus();
    }
    private void enableEditTexts(boolean isEnabled) {
        txtTitle.setEnabled(isEnabled);
        txtDescription.setEnabled(isEnabled);
        txtPrice.setEnabled(isEnabled);
    }
    private void showImage(String url) {
        if (url != null && url.isEmpty() == false) {
            int width = Resources.getSystem().getdisplayMetrics().widthPixels;
            Picasso.get()
                    .load(url)
                    .resize(width,width*2/3)
                    .centerCrop()
                    .into(imageView);
        }
    }

}

在活动中，即使上传图片后，上传的图片也不会显示在 imageview 中，但 imageUrl 已添加到 firebase。此外，当再次打开保存的交易时，不会显示图像。默认图像颜色为透明，但不会使用 firebase 的图像 url 设置图像视图。