RaisedButton(
          onPressed: _fonlsiyonadi, // bir fonksiyon tetikler
          textColor: Colors.white, // Yazı rengi
          padding: const EdgeInsets.all(0.0), // içten boşluk
          child: Text('BUTTON'), // Buton üzerindeki yazıyı belirler<br />        ),

    import 'package:flutter/material.dart';
    void main() {
      runApp(MyApp());
    }
    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
          home: Scaffold(
            appBar: AppBar(
              title: Text("Exploring Widgets"),
            ),
            body: myWidget(),
          ),
        );
      }
    }
    Widget myWidget() {
      return RaisedButton(
        child: const Text('Button'),
        color: Colors.blue,
        elevation: 4.0,
        splashColor: Colors.yellow,
        onPressed: () {
          // do something
        },
      );
    }