title: Data on screen updated when database changed on realtime database firebase using flutter
body: <p>Can u update the value of data on your screen base on the data in the firebase real time database without refreshing the screen.</p>
  <p>I have a sensor that send value each 10 second and when the database updated using that value. The value on my app screen still showing the last data and wont change unless you leave that screen or refresh it manually.</p>
  <p>can it be done automatically?</p>