Listening For Device Orientation Changes In Flutter

Question

I am looking for a way of listening for changes to the phones orientation, with the intent to hide something if the phone is Landscape.

My Layout is currently only displayed in portrait, as intended, but I want my app to do something if the device is rotated to Landscape, while keeping the layout in Portrait.

I have tried using a OrientationBuilder, but this only works if the layout changes to Landscape.

I have also tried using MediaQuery.of(context).orientation, but it continues to return portrait once the device is rotated, again only using the layouts orientation.

Answer 1

You can listen to screen size changes, but MediaQuery.of(...) should work as well and should cause rebuilds of your widget when orientation changes

https://stephenmann.io/post/listening-to-device-rotations-in-flutter/

import 'dart:ui';
import 'package:flutter/material.dart';

class WidthHeight extends StatefulWidget {
  WidthHeight({ Key key }) : super(key: key);

  @override
  WidthHeightState createState() => new WidthHeightState();
}

class WidthHeightState extends State
                       with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  double width = 0.0;
  double height = 0.0;

  @override void didChangeMetrics() {
    setState(() {
      width = window.physicalSize.width;
      height = window.physicalSize.height;
    });
  }

  @override
  Widget build(BuildContext context) {
    return new Text('Width: $width, Height $height');
  }
}