Uri of files in assets

I am using the RingtoneManager to play sounds. Everything works ok when I store sound files (.mp3) in the appropriate SD directories.

I find out the URI of the file and I give it to RingtoneManager to play.

sd_uri = Uri.parse( "/sdcard/media/path/to/file" );
Ringtone rt = RingtoneManager.getRingtone( getApplicationContext(), sd_uri );
rt.play();

Just wondering what to do in case of tablets that do not come with an SD card. My idea is to store sound files in res/开发者_如何转开发raw or res/assets dirs, but unlike MediaPlayer that accepts resource identifiers, RingtoneManager only wants Uri. How do I get the Uri of files in res/raw or res/assets dir? Ideally I would use res/raw, to get R.raw.* identifier, which might be handy.

Do not hardcode path as /sdcard use Environment.getExternalStorageDirectory() instead. This will remove the dependency on sdcard.

In my application I'm referencing to application res/asset located media file using URI like:

private static final String PLACEHOLDER="file:///android_asset/sample_video.3gp";