Firebase Storage - Download in local file

DownloadInLocalFile.java

private void downloadInLocalFile() {
  File dir = new File(Environment.getExternalStorageDirectory() + "/photos");
  final File file = new File(dir, UUID.randomUUID().toString() + ".png");
  try {
    if (!dir.exists()) {
      dir.mkdir();
    }
    file.createNewFile();
  } catch (IOException e) {
    e.printStackTrace();
  }

  final FileDownloadTask fileDownloadTask = imageRef.getFile(file);
  Helper.initProgressDialog(this);
  Helper.mProgressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialogInterface, int i) {
      fileDownloadTask.cancel();
    }
  });
  Helper.mProgressDialog.show();

  fileDownloadTask.addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
    @Override
    public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
      Helper.dismissProgressDialog();
      mTextView.setText(file.getPath());
      mImageView.setImageURI(Uri.fromFile(file));
    }
  }).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
      Helper.dismissProgressDialog();
      mTextView.setText(String.format("Failure: %s", exception.getMessage()));
    }
  }).addOnProgressListener(new OnProgressListener<FileDownloadTask.TaskSnapshot>() {
    @Override
    public void onProgress(FileDownloadTask.TaskSnapshot taskSnapshot) {
      int progress = (int) ((100 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount());
      Helper.setProgress(progress);
    }
  });
}