Develop Reference

How to choose specified File to upload to Firebase Storage?

I would like to upload my SQLite database File to Firebase Storage. My problem is that I can only find tutorials where the user has to choose the file manually, but I would like to send a fixed file, so you can't send other data to Firebase storage.
How can I do that?
Thank you.

First get the reference to the firebase storage
// Create a storage reference from our app
StorageReference storageRef = storage.getReference();
Then to upload the file do the following:
Uri file = Uri.fromFile("sqlite_file");
StorageReference filesRef = storageRef.child("files");
uploadTask = filesRef.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, etc.
// ...
}
});

Firebase Storage error: error getting token

I am building an android app which allows users to upload pictures to firebase storage. I am still in development mode so I set up my storage rules to public. When the user selects a picture to upload, the file is not uploaded but the download URL is returned. Logcat shows the following error
E/StorageUtil: error getting token java.util.concurrent.ExecutionException: com.google.firebase.internal.api.FirebaseNoSignedInUserException: Please sign in before trying to get a token.
And here is my storage rules
service firebase.storage {
match /b/{bucket}/o {
match /{allPaths=**} {
allow read, write;
}
}
}
And my android java code:
private void uploadPic() {
StorageReference mStorageRef = FirebaseStorage.getInstance().getReference();
Uri fileUrl = Uri.fromFile(new File(filePath));
String fileExt = MimeTypeMap.getFileExtensionFromUrl(fileUrl.toString());
final String fileName = UUID.randomUUID().toString()+"."+fileExt;
StorageReference profilePicsRef = mStorageRef.child("profile_pics/"+fileName);
profilePicsRef.putFile(fileUrl)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
#Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
// Get a URL to the uploaded content
Uri downloadUrl = taskSnapshot.getDownloadUrl();
Log.d("DOWNLOAD_URL", downloadUrl.toString());
}
})
.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception exception) {
// Handle unsuccessful uploads
// ...
Toast.makeText(getApplicationContext(), "Error: "+exception.toString(), Toast.LENGTH_LONG).show();
}
});
}
Any help will be greatly appreciated.
UPDATE
I have narrowed down the problem: I have two folders in storage, I can upload to the "Videos" folder, but not to the "profile_pics" folder or any other folder. Why is this happening?

For some reason unknown to mere mortals, the gods have refused upload to any folder that starts with "profile". I had to create another folder "users_profile_pic". Three days wasted!

How to get all files from firebase storage?

I have uploaded some files into Firebase directory and I want to list them and download one by one.There is no API/Documentation fo this.Could you help me ?

As of July 2019, version 18.1.0 of the Cloud Storage SDK now supports listing all objects from a bucket. You simply need to call listAll() in a StorageReference:
StorageReference storageRef = FirebaseStorage.getInstance().getReference();
// Now we get the references of these images
storageRef.listAll().addOnSuccessListener(new OnSuccessListener<ListResult>() {
#Override
public void onSuccess(ListResult result) {
for(StorageReference fileRef : result.getItems()) {
// TODO: Download the file using its reference (fileRef)
}
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(Exception exception) {
// Handle any errors
}
});
If you want to download these files, you can use one of the options shown in the Docs.
Please note that in order to use this method, you must opt-in to version 2 of Security Rules, which can be done by making rules_version = '2'; the first line of your security rules:
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {

first , you should get the file download Url to retrieve it, the easiest way is to upload a file and generate the download Url in your database, so after that you just go and retrieve each file from the storage like this :
private void downloadFile() {
FirebaseStorage storage = FirebaseStorage.getInstance();
StorageReference storageRef = storage.getReferenceFromUrl("<your_bucket>");
StorageReference islandRef = storageRef.child("file.txt");
File rootPath = new File(Environment.getExternalStorageDirectory(), "file_name");
if(!rootPath.exists()) {
rootPath.mkdirs();
}
final File localFile = new File(rootPath,"imageName.txt");
islandRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
#Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
Log.e("firebase ",";local tem file created created " +localFile.toString());
// updateDb(timestamp,localFile.toString(),position);
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception exception) {
Log.e("firebase ",";local tem file not created created " +exception.toString());
}
});
}

I personally use this method, whenever you upload a file, save its download URL in your Firebase Database, if you are uploading multiple files then save it in an array. There is no method for Firebase Storage android to download and upload multiple files in one go.
Whenever you want to download files access your firebase database for those URL's.

Android - Download File from Firebase by means of only URL

I'm developing a simple Android application that downloads a file from Firebase storage.
Is there any way to download a file getting only a link to the file? I found a few methods but they were requiring also the name of file
I don't know the name of downloading file, I need to download the file knowing only its URL.

Just try this :
FirebaseStorage storage = FirebaseStorage.getInstance();
StorageReference httpsReference = storage.getReferenceFromUrl("YOUR_FIREBASE_STORAGE_URL");
File localFile = File.createTempFile("PREFIX_FILE", "SUFFIX_FILE");
httpsReference.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
#Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
// Local temp file has been created
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception exception) {
// Handle any errors
}
});
Firebase Storage documentation.

Firebase image download from storage failed

I believe my implementation is wrong but i can't get my head around it.
I have searched for tutorials but can't find, It's only the official documentation i can find which is too much detailed for me to understand :)
//initialize
FirebaseStorage storage = FirebaseStorage.getInstance();
// Points to the root reference
StorageReference storageRef = storage.getReferenceFromUrl("gs://nse-ninja.appspot.com");
// Create a child reference
// imagesRef now points to "images"
StorageReference imagesRef = storageRef.child("images");
StorageReference spaceRef = storageRef.child("images/games.png");
File localFile = null;
try {
localFile = File.createTempFile("games", "png");
} catch (IOException e) {
e.printStackTrace();
}
spaceRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
#Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_SHORT).show();
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception exception) {
Toast.makeText(MainActivity.this, "Failed to download", Toast.LENGTH_SHORT).show();
}
});
After running the failed toast keeps popping up
Here is logcat
E/StorageException: StorageException has occurred.
User does not have permission to access this object.
Code: -13021 HttpResult: 403

This is likely because your security rules don't allow access. You can change your rules "public" by using the following rules:
service firebase.storage {
match /b/nse-ninja.appspot.com/o {
match /{allPaths=**} {
allow read, write;
}
}
}
Read the docs for some more info!