title: app-release.apk not installing in android device Flutter
body: <p>I am using <code>flutter build apk</code> to build apk. Now the apk is not installing on our android device. it was showing like App not installed as shown image.<a href="https://i.stack.imgur.com/4e632.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4e632.jpg" alt="enter image description here" /></a></p>
  <p>What may be the issue and how can I solve this?</p>