title: Is it bad leaving SharedPreferences & Editor open
body: <p>e.g. you have this class</p>
  
  <pre><code>private SharedPreferences sp
  private SharedPreferences.Editor editor
  
  protected void onCreate(..) {
  this.sp = ...
  this.editor = this.sp.edit();
  }
  </code></pre>
  
  <p>Is it bad to do that?</p>