How To Set Up Gradient Background With Tabbar In Flutter

TabBar(
      unselectedLabelColor: Colors.pinkAccent,
      indicatorSize: TabBarIndicatorSize.tab,
      indicator: BoxDecoration(
          gradient: LinearGradient(
              colors: [Colors.purple, Colors.orangeAccent]),
          borderRadius: BorderRadius.circular(40),
          color: Colors.pinkAccent),
      tabs: [
        Tab(
          child: Align(
            alignment: Alignment.center,
            child: Text("CAMERA"),
          ),
        ),
        Tab(
          child: Align(
            alignment: Alignment.center,
            child: Text("BIKE"),
          ),
        ),
        Tab(
          child: Align(
            alignment: Alignment.center,
            child: Text("TRAM"),
          ),
        ),
      ]),
),
body: TabBarView(children: [
  Icon(Icons.camera, size: 50,),
  Icon(Icons.directions_bike, size: 50,),
  Icon(Icons.tram, size: 50,),
]),

import 'package:flutter/material.dart';
import 'package:gradient_bottom_navigation_bar/gradient_bottom_navigation_bar.dart';


void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'App Design',
      home: MyHomePage(),
    );
  }
}

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;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
        length: 3,
        child: Scaffold(
          appBar: AppBar(
            centerTitle: true,
            title: Text('Gradiant TabBar'),
            backgroundColor: Colors.black,
            elevation: 0,
            bottom: TabBar(
                unselectedLabelColor: Colors.pinkAccent,
                indicatorSize: TabBarIndicatorSize.tab,
                indicator: BoxDecoration(
                    gradient: LinearGradient(
                        colors: [Colors.purple, Colors.orangeAccent]),
                    borderRadius: BorderRadius.circular(40),
                    color: Colors.pinkAccent),
                tabs: [
                  Tab(
                    child: Align(
                      alignment: Alignment.center,
                      child: Text("CAMERA"),
                    ),
                  ),
                  Tab(
                    child: Align(
                      alignment: Alignment.center,
                      child: Text("BIKE"),
                    ),
                  ),
                  Tab(
                    child: Align(
                      alignment: Alignment.center,
                      child: Text("TRAM"),
                    ),
                  ),
                ]),
          ),
          body: TabBarView(children: [
            Icon(Icons.camera, size: 50,),
            Icon(Icons.directions_bike, size: 50,),
            Icon(Icons.tram, size: 50,),
          ]),
        )
    );
  }
}