Add settings for Hass.io url and password

lib/settings.dart

@@ -0,0 +1,102 @@
+part of 'main.dart';
+
+class SettingsPage extends StatefulWidget {
+  SettingsPage({Key key, this.title}) : super(key: key);
+
+  final String title;
+
+  @override
+  _SettingsPageState createState() => new _SettingsPageState();
+}
+
+class _SettingsPageState extends State<SettingsPage> {
+  String _hassioDomain = "";
+  String _hassioPort = "";
+  String _hassioPassword = "";
+
+  @override
+  void initState() {
+    super.initState();
+    _loadSettings();
+  }
+
+  _loadSettings() async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+
+    setState(() {
+      _hassioDomain = prefs.getString("hassio-domain");
+      _hassioPort = prefs.getString("hassio-port");
+      _hassioPassword = prefs.getString("hassio-password");
+    });
+  }
+
+  _saveSettings() async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+
+    setState(() {
+      prefs.setString("hassio-domain", _hassioDomain);
+      prefs.setString("hassio-port", _hassioPort);
+      prefs.setString("hassio-password", _hassioPassword);
+      _hassioPassword = prefs.getString('hassio-password');
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // This method is rerun every time setState is called, for instance as done
+    // by the _incrementCounter method above.
+    //
+    // The Flutter framework has been optimized to make rerunning build methods
+    // fast, so that you can just rebuild anything that needs updating rather
+    // than having to individually change instances of widgets.
+    return new Scaffold(
+      appBar: new AppBar(
+        leading: IconButton(icon: Icon(Icons.arrow_back), onPressed: (){
+          _saveSettings();
+          Navigator.pop(context);
+        }),
+        // Here we take the value from the MyHomePage object that was created by
+        // the App.build method, and use it to set our appbar title.
+        title: new Text(widget.title),
+      ),
+      body: ListView(
+        padding: const EdgeInsets.all(20.0),
+        children: <Widget>[
+          new TextField(
+            decoration: InputDecoration(
+              labelText: "Home Assistant domain or ip address"
+            ),
+            controller: TextEditingController(
+              text: _hassioDomain
+            ),
+            onChanged: (value) {
+              _hassioDomain = value;
+            },
+          ),
+          new TextField(
+            decoration: InputDecoration(
+              labelText: "Home Assistant port"
+            ),
+            controller: TextEditingController(
+              text: _hassioPort
+            ),
+            onChanged: (value) {
+              _hassioPort = value;
+            },
+          ),
+          new TextField(
+            decoration: InputDecoration(
+                labelText: "Home Assistant password"
+            ),
+            controller: TextEditingController(
+                text: _hassioPassword
+            ),
+            onChanged: (value) {
+              _hassioPassword = value;
+            },
+          )
+        ],
+      ),
+    );
+  }
+}