请不要这样做:

while(!uri.isComplete());

即使可行，这也是一个循环，消耗的资源超过了需要.

Even if it works, it's a tight loop consuming more resources than needed.

相反，请遵循Firebase文档中显示的模式，该模式位于获取下载网址:

Instead follow the pattern shown in the Firebase documentation on getting a download URL:

reference.putFile(data)
    .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {


            Task<Uri> uriTask = taskSnapshot.getStorage().getDownloadUrl();
            uriTask.addOnSuccessListener(new OnSuccessListener<Uri>() {
                @Override
                public void onSuccess(Uri uri) {
                    Uri url = uriTask.getResult();

                    uploadPDF uploadPDF = new uploadPDF(editPDFName.getText().toString(),url.toString());
                    databaseReference.child(databaseReference.push().getKey()).setValue(uploadPDF);


                    Toast.makeText(MainActivity.this, "File uploaded", Toast.LENGTH_SHORT).show();
                    progressDialog.dismiss();
                }
            }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception exception) {
                    // Handle any errors
                }
            });
        }
    }).addOnProgressListener(