title: How to add a Password input type in flutter makes the password user input is not visible , just like Android Native EditText 's inputtype:password?
body: <p>i meet a problem that Flutter 's TextInputType  do not have a password type:</p>
  
  <pre><code>/// All possible enum values.
  
  static const List&lt;TextInputType&gt; values = const &lt;TextInputType&gt;[
    text, multiline, number, phone, datetime, emailAddress, url,
  ];
  </code></pre>
  
  <p>how to make the  password user input not visible? any one has a  good idea ?</p>