title: VideoView can play mp4 file in application data directory
body: <p>While save mp4 file to /data/data/mypackage/files/my.mp4, then call VideoView's setVideoPath(); it can not work.</p>
  
  <p>For the same file, if I save the file to /mnt/sdcard/my.mp4, then call the same VideoView's setVideoPath, it plays correctly.</p>
  
  <p>Is there any way I can play mp4 file under /data/data/mypackage/files/?</p>