How to reset ringtone back in android programmatically -

i've used following code set ringtone in app working fine. provide option remove ringtone , reset ringtone back. please me on this. in advance.

            uri path = uri.parse("android.resource://"                                 + getpackagename() + "/raw/ringtone");             ringtonemanager.setactualdefaultringtoneuri(                                 getapplicationcontext(),                                 ringtonemanager.type_ringtone, path); 

after taking existingringtonepath, can set custom ringtone path.

uri existingringtonepath = getdefaulturi(ringtonemanager.type_ringtone); 

after can use revert back.

ringtonemanager.setactualdefaultringtoneuri(                                 getapplicationcontext(),                                 ringtonemanager.type_ringtone, existingrinftonepath); 

if want revert default then,

ringtonemanager.setactualdefaultringtoneuri(                                 getapplicationcontext(),                                 ringtonemanager.type_ringtone, ringtonemanager.default_ringtone_uri);