code: public void setRingtone(String filepath) {
          if (filepath != null) {
              File file = new File(filepath);
              if (file.exists()) {
                  this.ringtoneUri = Uri.fromFile(file);
              } else {
                  Log.e(TAG, "ringtone file not found.");
              }
          }
      }
docs: Set ringtone file path.
  
  @param filepath