问题
Once you have uploaded a file to Firebase how can you get it's URL so that you can store that for later use? I want to write the URL to a Firebase Database so that other users can access the image.
I am uploading the file like so:
public void uploadFile()
{
StorageReference filepath = mstorageRef.child("folder").child(filename);
Uri File= Uri.fromFile(new File(mFileName));
filepath.putFile(File).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot)
{
Toast.makeText(MtActivity.this, "Upload Done", Toast.LENGTH_LONG).show();
}
});
}
I have confirmed that the files are in fact uploading so now I just need the URL which I can write to my Database. However when I tried to do this:
Uri downloadUrl = taskSnapshot.getMetadata().getDownloadUrl();
It gives me an error and says This method should only be accessed from tests or within private scope
I'm not sure what that means and I also don't know why I would be getting that error since I'm following this example provided by Firebase.
Is there a new way of getting the URL?
Also, is that URL unique to that item in particular? Meaning if I store it to a database and try to access it later will I be able to do so?
回答1:
You're using UploadTask.getDownloadUrl() which is deprecated. You can use StorageReference.getDownloadUrl().
In your case you can try this as -
filepath.putFile(File).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot)
{
filepath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Uri downloadUrl = uri;
//Do what you want with the url
}
Toast.makeText(MtActivity.this, "Upload Done", Toast.LENGTH_LONG).show();
}
});
Take care that StorageReference.getDownloadUrl() returns Task, which must be handled asynchronously, you cannot do Uri downloadUrl = photoRef.getDownloadUrl().getResult(); else you will get java.lang.IllegalStateException: Task is not yet complete
回答2:
This method works too and is a little bit simpler.
It's not something "incredible", but it reduces your code to a few lines. Hope that it's a helpful answer.
StorageReference filepath = mstorageRef.child("folder").child(filename);
filepath.putFile(File).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot){
Uri downloadUrl = filepath.getDownloadUrl(); // here is Url for photo
Toast.makeText(MtActivity.this, "Upload Done", Toast.LENGTH_LONG).show();
}
});
回答3:
Here is hot I did it
1) This is my Upload and get http url code:
UploadTask uploadTask = FirebaseStorage.getInstance().getReference().child("id").child("filename")
.putFile(uri);
Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
@Override
public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
if (!task.isSuccessful()) {
throw task.getException();
}
// Continue with the task to get the download URL
return FirebaseStorage.getInstance().getReference().child(user.getUid()).child(avatarName).getDownloadUrl();
}
}).addOnCompleteListener(new OnCompleteListener<Uri>() {
@Override
public void onComplete(@NonNull Task<Uri> task) {
if (task.isSuccessful()) {
Uri downloadUri = task.getResult();
FirebaseDatabase.getInstance().getReference().child(user.getUid())
.child(avatarName)
.child("avatar_image")
.setValue(downloadUri.toString());
Toast.makeText(getContext(), "Success", Toast.LENGTH_SHORT).show();
} else {
// Handle failures
// ...
Toast.makeText(getContext(), "Failed", Toast.LENGTH_SHORT).show();
}
}
});
2) This my onActivityResult code after pickup image from gallery
@Override
public 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) {
uri = data.getData();
try {
bitmap = MediaStore.Images.Media.getBitmap(getContext().getContentResolver(), uri);
// Log.d(TAG, String.valueOf(bitmap));
ivAvatarPic.setImageBitmap(bitmap);
//ImageView imageView = (ImageView) findViewById(R.id.imageView);
//imageView.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
回答4:
As already mentioned above, StorageReference.getDownloadUrl()
returns Task.
Here is my code:
filepath.putFile(imageUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if(task.isSuccessful()){
filepath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Uri downloadUri = uri;
String download_url = uri.toString();
mUserDatabase.child("image").setValue(download_url).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if(task.isSuccessful()) {
mProgressDialog.dismiss();
Toast.makeText(SettingActivity.this, "Successfully uploaded", Toast.LENGTH_LONG).show();
}else {
Toast.makeText(SettingActivity.this, "Error happened during the upload process", Toast.LENGTH_LONG).show();
}
}
});
}
});
}else{
Toast.makeText(SettingActivity.this, "Error happened during the upload process", Toast.LENGTH_LONG ).show();
}
}
});
回答5:
Try this one:
filepath.putFile(File).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if(task.isSuccessful()){
String fileUri = task.getResult().getUploadSessionUri().toString();
// Do whatever you want with fileUri
}
}
}) ;
回答6:
Use following code
val imageGalleryRef = storageReference?.child(name + "_gallery")
val uploadTask = imageGalleryRef.putFile(file)
uploadTask.addOnFailureListener({ e ->
Log.e(TAG, "onFailure sendFileFirebase " + e.message)
}).addOnCompleteListener(
object : OnCompleteListener<UploadTask.TaskSnapshot> {
override fun onComplete(p0: Task<UploadTask.TaskSnapshot>) {
imageGalleryRef.downloadUrl.addOnSuccessListener { e ->
run {
downloadUrl = e.toString() // e is image download Uri
}
}
}
}
)
回答7:
filePath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
String category = spinner.getSelectedItem().toString();
String title = ((EditText) findViewById(R.id.post_title)).getText().toString();
String description = ((EditText) findViewById(R.id.post_description)).getText().toString();
final Post post = new Post(userId, category, title, description, latitude, longitude, true);
post.setAddressList(addressLine);
post.setContact(contact);
if (addressLine != null) {
post.setPlace(addressLine.split(",")[2]);
}
post.setId(key);
post.setImage(uri.toString());
databaseReference.setValue(post).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()) {
((EditText) findViewById(R.id.post_title)).setText("");
((EditText) findViewById(R.id.post_description)).setText("");
postImageButton.setImageURI(null);
progressBarDialog.dismiss();
Toast.makeText(PostActivity.this, "Your request is sucessfully completed", Toast.LENGTH_SHORT).show();
} else if (!task.isSuccessful()) {
progressBarDialog.dismiss();
Toast.makeText(PostActivity.this, "Your request is not completed", Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
回答8:
change the URI to URL
val urlTask = uploadTask.continueWith { task ->
if (!task.isSuccessful) {
task.exception?.let {
throw it
}
}
spcaeRef.downloadUrl
}.addOnCompleteListener { task ->
if (task.isSuccessful) {
val downloadUri = task.result
//URL
val url = downloadUri!!.result
} else {
//handle failure here
}
}
回答9:
Did you try taskSnapshot.getDownloadUrl()?
if that also doesn't work you can get the image location in success listener by mstorageRef.child("folder").child(filename).toString()
回答10:
Try This :
final Uri uri = data.getData();
StorageReference filepath = mStorageRef.child("folder").child(filename);
filepath.putFile(uri).addOnSuccessListener(new
OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Uri downloadUri = taskSnapshot.getDownloadUrl();
//Getting url where image is stored
//downloadUri will store image URI
}
});
来源：https://stackoverflow.com/questions/43641941/how-to-get-file-url-after-uploading-them-to-firebase