试试这个

Question

我想在Android应用中的firebase存储上下载图片。

这是我的形象

我试试这个但是没有用

storageRef.child("1/1.jpg").getDownloadUrl().getResult();

Answer 1

试试这个

// Create a storage reference from our app
StorageReference storageRef = storage.getReference();

// Or Create a reference to a file from a Google Cloud Storage URI
StorageReference gsReference = 
    storage.getReferenceFromUrl("gs://bucket/images/stars.jpg");


/*In this case we'll use this kind of reference*/
//Download file in Memory
StorageReference islandRef = storageRef.child("images/island.jpg");

final long ONE_MEGABYTE = 1024 * 1024;
islandRef.getBytes(ONE_MEGABYTE).addOnSuccessListener(new         
OnSuccessListener<byte[]>() {
    @Override
    public void onSuccess(byte[] bytes) {
        // Data for "images/island.jpg" is returns, use this as needed
    }
}).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        // Handle any errors
    }
});

有关详情Download Files on Android

Answer 2

试试这个

// Create a storage reference from our app
StorageReference storageRef = storage.getReferenceFromUrl("gs://<your-bucket-name>");

// Create a reference with an initial file path and name
StorageReference pathReference = storageRef.child("users/me/yourpics.png");



storageRef.child("users/me/yourpics.png").getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
            @Override
            public void onSuccess(Uri uri) {
                // Got the download URL for 'users/me/profile.png'
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception exception) {
                // Handle any errors
            }
        });

下载-文件

https://firebase.google.com/docs/storage/android/download-files

Answer 3

要下载文件，请首先为要下载的文件创建云存储引用。

您可以通过将子路径附加到存储根目录来创建引用，也可以从引用云存储中的对象的现有gs://或https:// URL创建引用。

// Create a storage reference from our app
StorageReference storageRef = storage.getReference();

// Create a reference with an initial file path and name
StorageReference pathReference = storageRef.child("images/stars.jpg");

images是root的孩子。

storageRef.child("images/stars.jpg").getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
    @Override
    public void onSuccess(Uri uri) {
        // Got the download URL for 'users/me/profile.png'
    }
}).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        // Handle any errors
    }
});

Answer 4

我在这个问题上有点迟了。我遇到了同样的问题，但是获取文件的URL（即getDownloadUrl()为shown in the Firebase docs）不能解决整个问题，该问题是下载文件。

这是因为向浏览器发送下载（或附件）响应需要文件内容（而不是URL）。为了获取URL并获取实际文件内容，需要HTTP请求，使用免费的Spark Firebase帐户对我们来说这不是一个选择。

要解决此问题，我使用了存储桶中的download()方法，该方法使我可以将存储文件另存为本地tmp文件。然后，我使用fs read流将文件内容通过管道传递到云函数响应...

const fireapp = '<thebucket>.appspot.com'; const gcs = require('@google-cloud/storage')({keyFilename:'serviceAccount.json'}); const bucket = gcs.bucket(fireapp); // storage path let fn = 'folder/theimage.png'; // allow CORS res.set('Access-Control-Allow-Origin', '*'); // download w/o external http request // by download file from bucket // and saving to tmp folder const tempFilePath = path.join(os.tmpdir(), "tmpfile.jpg"); bucket.file(fn).download({destination: tempFilePath}).then(()=>{ console.log('Image downloaded locally to', tempFilePath); var filestream = fs.createReadStream(tempFilePath); filestream.pipe(response); });

Answer 5

package com.example.package.myfirestore;

import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.MimeTypeMap;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.OnProgressListener;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

import java.io.IOException;
import java.net.URI;

/**
 * Created by Yeshveer on 6/9/2018.
 */

public class UploadImg extends AppCompatActivity{
    private TextView textView1;
    private ImageView img1;
    private EditText edittext1;
    private Button Btn1;
    private Button Btn2;
    int Image_requestcode=7;
    ProgressDialog pd;
    Uri filpath;
    FirebaseStorage storage1;
    StorageReference storageReference;
    StorageReference storageReference2;
    FirebaseFirestore db;

  FirebaseStorage storage;

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

        textView1 = (TextView) findViewById(R.id.textView1);
        img1 = (ImageView) findViewById(R.id.img1);
        edittext1 = (EditText) findViewById(R.id.edittext1);
        Btn1 = (Button) findViewById(R.id.Btn1);
        Btn2 = (Button) findViewById(R.id.Btn2);

        // Create Storage Referece
        storage1=FirebaseStorage.getInstance();
        storageReference = storage1.getReference();

        //PD details
        pd=new ProgressDialog(this);
        pd.setTitle("Uploading Image");



// Image Chooser
        Btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Creating Intent
                Intent intent = new Intent();

                //Setting Intent of Image type and select Image from Mobile Storage
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, "Please Select Image"), Image_requestcode);
            }
        });

        Btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                UploadingStart();
            }
        });
    }

    private void UploadingStart() {
        // Image path Print

        textView1.setText(GetFileExtension(filpath));
        pd.show();
        storageReference2=storageReference.child("images/"+"hello"+"."+GetFileExtension(filpath));
        storageReference2.putFile(filpath)
                .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        pd.dismiss();
                        Toast.makeText(UploadImg.this, "Uploaded Successfully", Toast.LENGTH_SHORT).show();
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        pd.dismiss();
                        Toast.makeText(UploadImg.this, "Error in Uploading, Please check Internet connection", Toast.LENGTH_SHORT).show();
                    }
                })
                .addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                        double progress=(100.0* taskSnapshot.getBytesTransferred()/taskSnapshot.getTotalByteCount());
                        pd.setMessage("Progress is "+(int)progress+"%");
                    }
                });



    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode==Image_requestcode && resultCode==RESULT_OK && data != null && data.getData() != null){
            filpath=data.getData();

            try {
                // Image content resolver
                Bitmap bitmap= MediaStore.Images.Media.getBitmap(getContentResolver(),filpath);
                img1.setImageBitmap(bitmap);


            } catch (IOException e) {
                e.printStackTrace();
            }


        }
    }



    // Method for file etention and path
    public String GetFileExtension(Uri uri){
        ContentResolver contentResolver=getContentResolver();
        MimeTypeMap mimeTypeMap=MimeTypeMap.getSingleton();

        // Return file Extension
        return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(uri));

    }

}

如何在firebase存储上下载图像？

5 个答案:

试试这个