title: Cordova android_asset real path
body: <p>I want to open a PDF file but I must provide to 
  <code>cordova.plugins.fileOpener2.open</code> a real path (i.e. <code>/sdcard/Download/starwars.pdf</code>) because a path like i.e. <code>file:///android_asset/www/starwars.pdf</code>
  doesn't work and in fact the plugin returns <strong>file not found</strong>.</p>
  
  <p>Now, where is into device <code>android_asset</code> dir? How is it real mapped?</p>