مشكله في flutter

هل يمكنك إرفاق كامل كود الصفحة لو سمحت ؟ 

بتاريخ الآن قال بلال زيادة:

هل يمكنك إرفاق كامل كود الصفحة لو سمحت ؟ 

هذا هو الكود 

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Welcome to Flutter',
      home: NewTest()
    );
  }
}

class NewTest extends StatefulWidget {
  const NewTest({Key? key}) : super(key: key);

  @override
  State<NewTest> createState() => _NewTestState();
}

class _NewTestState extends State<NewTest> {

  @override
  Widget build(BuildContext context) {
    int index_ = 0  ;
    return Scaffold(
      appBar: AppBar(),
      drawer: Drawer() ,
      body: null ,
      bottomNavigationBar: BottomNavigationBar(
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "one" ,
          )
          ,
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "one" ,
          )
          ,
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "one" ,
          )
          ,
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "one" ,
          )
          ,
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "one" ,
          )
        ],

        // styles
        unselectedItemColor: Colors.black ,
        selectedItemColor: Colors.blue ,
        showUnselectedLabels: true ,
        showSelectedLabels: true ,
        backgroundColor: Colors.red, // ---> not working why??

        // onTap doesn't working
        onTap: (val){
          setState(() {
            index_ = val ;
          });
        },
        currentIndex: index_,
      ),
    );
  }
}

في دالة 

BottomNavigationBarItem

يمكنك وضع لون الخلفية للون الأحمر بهذا الشكل 

BottomNavigationBarItem(
            backgroundColor: Colors.red,
            icon: Icon(Icons.add_chart_sharp),
            label: "one",
          ),

بخصوص المشكلة الثانية و هي عدم الأنتقال إلى الصفحات عند الضغط على الأيقونات أسفل ، لأنه لم تقوم بوضع صفحات للتنقل عليها فيمكنك إنشاء List بهذا الشكل 

final pages = [
    const Page1(),
    const Page2(),
    const Page3(),
    const Page4(),
  ];

ووضع في body هذه القائمة بهذا الشكل 

body: pages[pageIndex],

و الصفحات ممكن أن تكون 

class Page1 extends StatelessWidget {
  const Page1({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 1",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}

class Page2 extends StatelessWidget {
  const Page2({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 2",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}

class Page3 extends StatelessWidget {
  const Page3({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 3",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}

class Page4 extends StatelessWidget {
  const Page4({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 4",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}

فيكون كامل الكود 

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
        debugShowCheckedModeBanner: false,
        title: 'Welcome to Flutter',
        home: NewTest());
  }
}

class NewTest extends StatefulWidget {
  const NewTest({Key? key}) : super(key: key);

  @override
  State<NewTest> createState() => _NewTestState();
}

class _NewTestState extends State<NewTest> {
  @override
  Widget build(BuildContext context) {
    int _selectedIndex = 0;
    final pages = [
      const Page1(),
      const Page2(),
      const Page3(),
      const Page4(),
      const Page4(),
    ];

    void _onItemTapped(int index) {
      setState(() {
        _selectedIndex = index;
      });
    }

    return Scaffold(
      appBar: AppBar(),
      drawer: const Drawer(),
      body: pages.elementAt(_selectedIndex),
      bottomNavigationBar: BottomNavigationBar(
        items: const [
          BottomNavigationBarItem(
            backgroundColor: Colors.red,
            icon: Icon(Icons.add_chart_sharp),
            label: "one",
          ),
          BottomNavigationBarItem(
            backgroundColor: Colors.red,
            icon: Icon(Icons.add_chart_sharp),
            label: "two",
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "three",
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "foure",
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.add_chart_sharp),
            label: "five",
          )
        ],

        // styles
        unselectedItemColor: Colors.black,
        selectedItemColor: Colors.blue,
        showUnselectedLabels: true,
        showSelectedLabels: true,

        // onTap doesn't working
        onTap: _onItemTapped,
        currentIndex: _selectedIndex,
      ),
    );
  }
}

class Page1 extends StatelessWidget {
  const Page1({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 1",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}

class Page2 extends StatelessWidget {
  const Page2({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 2",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}

class Page3 extends StatelessWidget {
  const Page3({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 3",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}

class Page4 extends StatelessWidget {
  const Page4({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xffC4DFCB),
      child: Center(
        child: Text(
          "Page Number 4",
          style: TextStyle(
            color: Colors.green[900],
            fontSize: 45,
            fontWeight: FontWeight.w500,
          ),
        ),
      ),
    );
  }
}