main

main.dart

+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+void main() {
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  // This widget is the root of your application.
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'tank water level analysier from raspery pi',
+      theme: ThemeData(
+        primarySwatch: Colors.blue,
+        visualDensity: VisualDensity.adaptivePlatformDensity,
+      ),
+      home: MyHomePage(title: 'Tank water level from raspery pi'),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  MyHomePage({Key key, this.title}) : super(key: key);
+
+  final String title;
+
+  @override
+  _MyHomePageState createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  static const platform =
+      const MethodChannel('samples.flutter.dev/connect wit rasperypi');
+
+  String _tankLevel = 'you can find water level heair.';
+
+  Future<void> _gettankLevel() async {
+    String tankLevel;
+    try {
+      final int result = await platform.invokeMethod('gettankLevel');
+      tankLevel = 'tank level at $result % .';
+    } on PlatformException catch (e) {
+      tankLevel = "Failed to get tank level: '${e.message}'.";
+    }
+
+    setState(() {
+      _tankLevel = _tankLevel;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Center(
+        child: Column(
+          // horizontal).
+          mainAxisAlignment: MainAxisAlignment.center,
+          //padding: new EdgeInsets.all(20),
+          children: <Widget>[
+            Text(
+              _tankLevel,
+              style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
+            ),
+          ],
+        ),
+      ),
+      floatingActionButton: Padding(
+        child: FloatingActionButton.extended(
+          elevation: 4.0,
+
+          //icon: const Icon(Icons.add),
+          label: const Text('Get tank level'),
+          onPressed: _gettankLevel,
+        ),
+        padding: new EdgeInsets.only(bottom: 20),
+      ),
+      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
+    );
+  }
+}