How do I get numbered entries in a beamer bibliography

Question

Instead of the default icons or the text option, I would like to have numbered entries in my bibliography.

I added the line:

\setbeamertemplate{bibliography item}{}

to get rid of the icons, but can't figure out how to get numbers to display in their place. The references in the content slides are numbered, but without the corresponding number in the bibliography it's not very helpful.

MWE:

\documentclass[t]{beamer}

\setbeamertemplate{navigation symbols}{}
\setbeamertemplate{bibliography item}{}
\setbeamertemplate{frametitle continuation}[from second]

\setbeamertemplate{footline}{
    \hspace*{0.1cm}
    \text{short title}
    \hspace{1cm}
    \insertshortauthor
    \hspace{3.5cm}
    \insertsectionhead
    \hfill
    \insertframenumber
    /
    \inserttotalframenumber
    \hspace{0.1cm}
}

\title{a title}
\author[me]{my full name}
\institute{where I work}
\date{today}

\begin{document}

\begin{frame}
    \titlepage
\end{frame}

\begin{frame}
    \frametitle{1st slide}
    Some text. \cite{ref_1} More interesting text. \cite{ref_2} Some even more interesting stuff. \cite{ref_3} 
\end{frame}

\begin{frame}[allowframebreaks]
\frametitle{References}
    \tiny{\bibliographystyle{abbrv} }
    \bibliography{refs}
\end{frame}

\end{document}

Bib file:

@inproceedings{ref_1,
  title={title 1},
  author={A. Author},
  booktitle={book title},
  year={2010}
}
@article{ref_2,
  title={title 2},
  author={B. Author},
  journal={Journal},
  volume={35},
  number={10},
  pages={1217--1256},
  year={2010},
  publisher={Publisher}
}
@incollection{ref_3,
  title={title 3},
  author={C. Author},
  booktitle={book title},
  pages={595--606},
  year={2012},
  publisher={publisher}
}

Resulting bibliography:

Answer 1

Edited answer

^{This works independently of the bibliography style, and with biblatex as well.}

According to the beamer documentation, subsection 10.6, you can use

\setbeamertemplate{bibliography item}{\insertbiblabel}

instead of

\setbeamertemplate{bibliography item}{}

so that the bib label is inserted for each bib item.

The result is:

Original answer

^{This works in the particular case of the OP, because using the bibliography style abbrv, \insertbiblabel inserts [\theenumiv].}

I think the beamer class uses the counter enumiv to number the items in the thebibliography environment as the standard classes.

So, substituting the line

\setbeamertemplate{bibliography item}{}

with

\setbeamertemplate{bibliography item}{[\theenumiv]}

you should obtain what you want:

Answer 2

The accepted answer didn't work with biblatex as all reference numbers became zero. What worked was to substitute the line:

\setbeamertemplate{bibliography item}{}

in the code example with:

\setbeamertemplate{bibliography item}[text]

and that works with both bibtex and biblatex.