How to Correctly Retrieve a Download URL from Firebase Storage?

Retrieving Download URL from Firebase Storage

Firebase Storage offers a comprehensive API for storing and retrieving files in the cloud. A common task is to obtain a HTTP URL that can be used to download the uploaded object. However, using taskSnapshot.getTask().getResult() to get the download URL is incorrect.

Using addOnSuccessListener

Instead, the recommended approach is to use the addOnSuccessListener method, as demonstrated in the following code:

uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
    @Override
    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
        storageRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
            @Override
            public void onSuccess(Uri uri) {
                String url = uri.toString();

                // Perform desired actions with the download URL
            }
        });
    }
});

Changes in Storage SDK

Previously, the StorageMetadata.getDownloadUrl() and UploadTask.TaskSnapshot.getDownloadUrl() methods were used for this purpose. However, they have been deprecated and are no longer available.

Asynchronous Nature of getDownloadUrl()

It's important to note that getDownloadUrl() is asynchronous, meaning it returns a Task object. A success or failure listener must be attached to this task to handle the result. In the example provided, addOnSuccessListener is utilized for this purpose.

Network Connectivity

Ensure that the device has an active internet connection before attempting to retrieve the download URL. The success or failure listeners will only be called if the device can establish a connection with Firebase Storage's backend.

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