I have device with some ringtones at /system/media/audio/ringtones by default. I would like to get that path as programatically.I mean i would like to get the ringtones directory path from my device as programetically.
If you want to work with ringtones use RingtoneManager because ringtones may be stored in few other directories. RingtoneManager gives you all possible ringtones from your device.
Check also http://developer.android.com/guide/topics/data/data-storage.html#AccessingExtFiles and DIRECTORY_RINGTONES.
To directly answer your question there is no environment variable querying it you get the default ringtone directory.