title: ExoPlayer - how to play local mp3 file
body: <p>I'm trying to use ExoPlayer instead of MediaPlayer because it's a common bug that MediaPlayer returns wrong getCurrentPosition() and I need a substitute.</p>
  
  <p>But I can't find an info anywhere how to open a local file through the file path to the file same as MediaPlayer's <code>.setDataSource(String filepath)</code></p>
  
  <p>Google doesn't have any example and the official documentation site strangely crash my FireFox browser on both computers</p>