title: How to set multiple default values in a MultiSelectListPreference?
body: <p>I have preference.xml like this</p>
  
  <pre><code>&lt;MultiSelectListPreference
          android:key="store_select"
          android:title="@string/setting_store_title"
          android:summary="@string/setting_store_summary"
          android:dialogTitle="@string/setting_store_dialog_title"
          android:entries="@array/store_names"
          android:entryValues="@array/stores"
          android:defaultValue="@array/stores"
          /&gt;
  </code></pre>
  
  <p>with my two arrays:</p>
  
  <pre><code>    &lt;string-array name="stores"&gt;
      &lt;item&gt;1&lt;/item&gt;
      &lt;item&gt;2&lt;/item&gt;
      &lt;item&gt;3&lt;/item&gt;
      &lt;item&gt;4&lt;/item&gt;
      &lt;item&gt;5&lt;/item&gt;
  &lt;/string-array&gt;
  
  &lt;string-array name="store_names"&gt;
      &lt;item&gt;foodbasics&lt;/item&gt;
      &lt;item&gt;nofrills&lt;/item&gt;
      &lt;item&gt;metro&lt;/item&gt;
      &lt;item&gt;loblaws&lt;/item&gt;
      &lt;item&gt;sobeys&lt;/item&gt;
  &lt;/string-array&gt;
  </code></pre>
  
  <p>I want the default behaviour to be all of the options selected, but currently nothing is selected by default. Am I doing something wrong?</p>