title: Is there an equivalent widget in flutter to the "select multiple" element in HTML
body: <p>I am searching for a widget in flutter that is equal to</p>
  
  <pre><code>&lt;select multiple=""&gt;&lt;/select&gt;
  </code></pre>
  
  <p>in flutter.</p>
  
  <p>An example implementation (for the web) is <a href="https://materializecss.com/select.html" rel="noreferrer" title="MaterializeCSS Select Multiple">MaterializeCSS Select Multiple</a></p>
  
  <p>As seen above I should be able to provide a list of items (with some of them preselected) and at the end retrieve a list of selected items or a map or something else.</p>
  
  <p>An example implementation or a link to a documentation is very appreciated.</p>