title: Check image is loaded in Image.network widget in flutter
body: <p>I am new to Flutter. I try to load network images using <code>image.network</code> widget. it's working fine but sometimes it takes time to load. I added tap listener to <code>image.network</code> during tap I need to check image is fully loaded or not based on the result I need to redirect the page. how to check image is loaded or not?</p>
  <p><strong>Code:</strong></p>
  <pre><code>new Image.network('http://via.placeholder.com/350x150')
  </code></pre>
  <p>Any help will be appreciated, thank you in advance</p>