如何獲取正在上傳的圖片的Firebase下載網址？

Question

我使用下面的代碼將圖片上傳到firebase存儲，但是當圖片上傳時，我希望能夠使用下載網址來調用圖片。這可能嗎？

ViewUserMapActivity

package uk.co.jaunt_app.jaunt; 

import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.location.Location; 
import android.net.Uri; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.support.annotation.NonNull; 
import android.support.v4.app.FragmentActivity; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.OnMapReadyCallback; 
import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.model.BitmapDescriptorFactory; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MapStyleOptions; 
import com.google.android.gms.maps.model.MarkerOptions; 
import com.google.android.gms.tasks.OnFailureListener; 
import com.google.android.gms.tasks.OnSuccessListener; 
import com.google.firebase.storage.FirebaseStorage; 
import com.google.firebase.storage.StorageReference; 
import com.google.firebase.storage.UploadTask; 

import java.util.UUID; 

import static uk.co.jaunt_app.jaunt.R.id.MapDistance; 
import static uk.co.jaunt_app.jaunt.R.id.map; 

public class ViewUserMapActivity extends FragmentActivity implements OnMapReadyCallback { 

    private GoogleMap mMap; 
    Button HomeButt; 
    TextView MapName; 
    TextView MapStartLocLat; 
    TextView MapStartLocLong; 
    TextView MapEndLocLat; 
    TextView MapEndLocLong; 
    TextView mapDistance; 
    Button chooseImg, uploadImg; 
    ImageView imgView; 
    int PICK_IMAGE_REQUEST = 111; 
    Uri filePath; 
    ProgressDialog pd; 
    TextView imgUrl; 

    FirebaseStorage storage = FirebaseStorage.getInstance(); 
    StorageReference storageRef = storage.getReferenceFromUrl("gs://jaunt-ddc86.appspot.com/"); 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_view_user_map); 
     SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
       .findFragmentById(map); 
     mapFragment.getMapAsync(this); 

     HomeButt = (Button) findViewById(R.id.backHome); 
     MapName = (TextView) findViewById(R.id.MapName); 
     MapStartLocLat = (TextView) findViewById(R.id.MapStartLocLat); 
     MapStartLocLong = (TextView) findViewById(R.id.MapStartLocLong); 
     MapEndLocLat = (TextView) findViewById(R.id.MapEndLocLat); 
     MapEndLocLong = (TextView) findViewById(R.id.MapEndLocLong); 
     mapDistance = (TextView) findViewById(MapDistance); 
     imgUrl = (TextView) findViewById(R.id.imgurl); 

     Intent intent = getIntent(); 
     final String mapName = intent.getStringExtra("mapName"); 
     String mapStartLat = intent.getStringExtra("mapStartLat"); 
     String mapStartLong = intent.getStringExtra("mapStartLong"); 
     String mapEndLat = intent.getStringExtra("mapEndLat"); 
     String mapEndLong = intent.getStringExtra("mapEndLong"); 
     MapName.setText(mapName); 
     MapStartLocLat.setText(mapStartLat); 
     MapStartLocLong.setText(mapStartLong); 
     MapEndLocLat.setText(mapEndLat); 
     MapEndLocLong.setText(mapEndLong); 


     chooseImg = (Button)findViewById(R.id.chooseImg); 
     uploadImg = (Button)findViewById(R.id.uploadImg); 
     imgView = (ImageView)findViewById(R.id.imgView); 

     pd = new ProgressDialog(this); 
     pd.setMessage("Uploading...."); 


     chooseImg.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(); 
       intent.setType("image/*"); 
       intent.setAction(Intent.ACTION_PICK); 
       startActivityForResult(Intent.createChooser(intent, "Select Image"), PICK_IMAGE_REQUEST); 
      } 
     }); 

     uploadImg.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if(filePath != null) { 
        pd.show(); 
        String imageID = UUID.randomUUID().toString(); 
        StorageReference childRef = storageRef.child(imageID); 

        //uploading the image 
        UploadTask uploadTask = childRef.putFile(filePath); 

        uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() { 
         @Override 
         public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) { 
          pd.dismiss(); 
          Toast.makeText(ViewUserMapActivity.this, "Image Uploaded Successfully", Toast.LENGTH_LONG).show(); 
         } 

        }).addOnFailureListener(new OnFailureListener() { 
         @Override 
         public void onFailure(@NonNull Exception e) { 
          pd.dismiss(); 
          Toast.makeText(ViewUserMapActivity.this, "Upload Failed -> " + e, Toast.LENGTH_LONG).show(); 
         } 
        }); 

       } 
       else { 
        Toast.makeText(ViewUserMapActivity.this, "Select An Image", Toast.LENGTH_LONG).show(); 
       } 
      } 
     }); 
    } 



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

     if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) { 
      filePath = data.getData(); 

      try { 
       //getting image from gallery 
       Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath); 
       //Setting image to ImageView 
       imgView.setImageBitmap(bitmap); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 

    } 


    @Override 
    public void onMapReady(GoogleMap googleMap) { 
     mMap = googleMap; 
     googleMap.setMapStyle(MapStyleOptions.loadRawResourceStyle(this, R.raw.style_json)); 

     String mapstartlat = MapStartLocLat.getText().toString().trim(); 
     String mapstartlong = MapStartLocLong.getText().toString().trim(); 
     String mapendlat = MapEndLocLat.getText().toString().trim(); 
     String mapendlong = MapEndLocLong.getText().toString().trim(); 

     double startlat = Double.valueOf(mapstartlat); 
     double startlong = Double.valueOf(mapstartlong); 
     double endlat = Double.valueOf(mapendlat); 
     double endlong = Double.valueOf(mapendlong); 

     LatLng Start = new LatLng(startlat, startlong); 
     LatLng End = new LatLng(endlat, endlong); 
     mMap.addMarker(new MarkerOptions().position(Start) 
       .icon(BitmapDescriptorFactory.fromResource(R.drawable.mappin))); 
     mMap.addMarker(new MarkerOptions().position(End) 
       .icon(BitmapDescriptorFactory.fromResource(R.drawable.mappin))); 
     mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(End, 6)); 

     Location loc1 = new Location(""); 
     loc1.setLatitude(startlat); 
     loc1.setLongitude(startlong); 

     Location loc2 = new Location(""); 
     loc2.setLatitude(endlat); 
     loc2.setLongitude(endlong); 

     float distanceInMeters = loc1.distanceTo(loc2); 
     Double value = 0.00062137; 
     Double distanceValue = (distanceInMeters)*value; 
     mapDistance.setText(String.format("%.1f mi", distanceValue)); 

     HomeButt.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(ViewUserMapActivity.this, MainActivity.class); 
       startActivity(intent); 
      } 
     }); 

    } 

} 

Answer 1

使用getDownloadUrl()在你的成功回調。一旦上傳完成，它就會被填充。

更多信息here。

Answer 2

從Firebase documentation on uploading a local file：

您可以上傳設備上的本地文件，如從相機的照片和視頻，與putFile()方法。 putFile()需要一個文件並返回UploadTask，您可以使用它來管理和監視上載的狀態。

Uri file = Uri.fromFile(new File("path/to/images/rivers.jpg")); 
StorageReference riversRef = storageRef.child("images/"+file.getLastPathSegment()); 
uploadTask = riversRef.putFile(file); 

// Register observers to listen for when the download is done or if it fails 
uploadTask.addOnFailureListener(new OnFailureListener() { 
    @Override 
    public void onFailure(@NonNull Exception exception) { 
     // Handle unsuccessful uploads 
    } 
}).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() { 
    @Override 
    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) { 
     // taskSnapshot.getMetadata() contains file metadata such as size, content-type, and download URL. 
     Uri downloadUrl = taskSnapshot.getDownloadUrl(); 
    } 
});