kodlarım şu şekilde

import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
/*import 'package:flutter/services.dart';
import 'package:fluttertoast/fluttertoast.dart';*/


void main() {
  runApp(MyApp());

}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
 /* final GlobalKey<ScaffoldState> _scaffoldkey = new GlobalKey<ScaffoldState>();
  _showSnackBar(){
    final snackBar = new SnackBar(
      content: new Text('Silmek istiyotmusun'),
      duration: new Duration(seconds: 2),
      backgroundColor: Colors.red,
      action: new SnackBarAction(label: 'evet', onPressed: null),
    );
  }*/
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'zikirmatik',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.green,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter ZİKİRMATİK'),

    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  final snackBar =SnackBar(
    content: Text("Bu Benim İlk Mesajım."),
    backgroundColor: Colors.red,
    action: SnackBarAction(
      textColor: Colors.white,
      label: "Test Butonu",
      onPressed: (){
        // Buraya Butona Tıklayınca Yapılacak Olaylar Yazılacak.
      },
    ),
  );

  void _incrementCounter() {
    setState(() {

      _counter++;

    });
  }
  void sifirla() {
    setState(() {
     /* Fluttertoast.showToast(
          msg: "Sıfırlamak İstediğine Emin Misin ?!",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.CENTER,
          timeInSecForIosWeb: 2,
          backgroundColor: Colors.red,
          textColor: Colors.white,
          fontSize: 20.0,

      );*/
      _counter=0;

    });

  }
  void _incrementCounter1() {
    setState(() {
if(_counter>0)
      _counter--;
    });
  }


  @override
  Widget build(BuildContext context) {
    final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
    Scaffold(
      key:_scaffoldKey,

    );

    /*final snackBar =SnackBar(
      content: Text("sıfırlamak istediğinden emin misin"),
      backgroundColor: Colors.red,
      action: SnackBarAction(
        textColor: Colors.white,
        label: 'evet',
        onPressed: (){
          sifirla();
        },
      ),
    );*/

    return Scaffold(
      appBar: AppBar(
        // 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: Text(widget.title),
        centerTitle: true,
      ),
      body:

      Center(


        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.

        child: Column(


          mainAxisAlignment: MainAxisAlignment.center,
          children:

          <Widget>[

            Image(
              image: NetworkImage('http://ilerleyen.com.tr/Content/img/ilerleyen-teknoloji-logo.png'), width: 200,height: 150, alignment:Alignment.topLeft,
            /// istersem şu şekildede olabilir Image.network('source'),|| Image.asset('sorç') şeklinde
            ),
            Text(
              'Aşağıdaki butonlara tıkladığınızda zikirmatiğiniz çalışacaktır', style: TextStyle(fontSize: 22,fontWeight: FontWeight.bold, ) , textAlign: TextAlign.center,
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline2, textAlign: TextAlign.center,
            ),




            RaisedButton(
              onPressed: (){
                final snackBar = SnackBar(
                  content: Text('Yay! A SnackBar!'),
                  action: SnackBarAction(
                    label: 'Undo',
                    onPressed: () {
                      // Some code to undo the change.
                    },
                  ),
                );

                // Find the Scaffold in the widget tree and use
                // it to show a SnackBar.
                _scaffoldKey.currentState.showSnackBar(snackBar);
              },
              color: Colors.red,
              child: Text('Sıfırla'),
              padding: EdgeInsets.symmetric(vertical: 15.0, horizontal: 35),
              splashColor: Colors.green ,
            ),
         

          ],
          ),
      ),

        floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      floatingActionButton: Column(
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
       FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Zikiri Arttır',
        child: Icon(Icons.thumb_up),
        mini: false,

      ),

      FloatingActionButton(
        onPressed: _incrementCounter1,
        splashColor: Colors.green,
         tooltip: 'Zikiri Azalt',
         child: Icon(Icons.thumb_down), focusColor: Colors.blueGrey,
        mini: false,
        backgroundColor: Colors.red,


     ),

        ]


    )); }

}