title: Deleting all but one SharedPreference
body: <p>I want to clear all but one SharedPreference. If I've saved 10+, is there a better way then removing each individually? This gets a bit redundant:</p>
  
  <pre><code>preferences.edit().remove("1").commit();
  preferences.edit().remove("2").commit();
  preferences.edit().remove("3").commit();
  ...
  preferences.edit().remove("15").commit();
  </code></pre>