Change Default Notification Ringtone on Android -

i'm trying change notification ringtone within app. far can notification ringtones show, , select 1 of them, it's not changing it. i'm using far:

sharedpreferences settings = preferencemanager.getdefaultsharedpreferences(this);         uri notification = uri.parse(settings.getstring("timersound", ringtonemanager.getdefaulturi(ringtonemanager.type_notification).tostring()));          intent intent = new intent(ringtonemanager.action_ringtone_picker);         intent.putextra(ringtonemanager.extra_ringtone_type, ringtonemanager.type_notification);         intent.putextra(ringtonemanager.extra_ringtone_title, "select alert tone");         intent.putextra(ringtonemanager.extra_ringtone_existing_uri, notification);         intent.putextra(ringtonemanager.extra_ringtone_show_silent, false);              startactivityforresult(intent, 5); 

you can change notification ringtone following code

//new ringtone uri uri nuri = uri.parse("");  //change notification ringtonemanager.setactualdefaultringtoneuri(this,ringtonemanager.type_notification, nuri); 

if u want change ringtone sound can using following code

    audiomanager audio = (audiomanager) getsystemservice(context.audio_service); audio.setringermode(audiomanager.ringer_mode_normal); (int volumetype : (new int[] { audiomanager.stream_system,     audiomanager.stream_ring,audiomanager.stream_notification,audiomanager.stream_alarm })) {         int maxvolume = audio.getstreammaxvolume(volumetype);         audio.setstreamvolume(volumetype, maxvolume,                 audiomanager.flag_play_sound | audiomanager.flag_vibrate);         audio.setstreammute(volumetype, false);         audio.setvibratesetting(volumetype, audiomanager.vibrate_setting_on); 

thank you