Stop a ringtone

Hi, can someone give me info and sample on how stop a ringtone?

Code:

  Dim jo As JavaObject
   jo.InitializeStatic("android.media.RingtoneManager")
Dim jo2 As JavaObject
   jo2.InitializeContext
Dim u As Uri
   u.Parse(rm.GetDefault(rm.TYPE_RINGTONE))
   ringtone =jo.RunMethodJO("getRingtone", Array(jo2, u))
'jo.RunMethod("stopPreviousRingtone", Null)
   ringtone.RunMethod("stop", Null)  

This Not stop the ringtone.

Help please.

Thank you.

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