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Advance Flutter Code Snippet | Learn Flutter by Code

 Dropdownlist Example in Flutter:

import 'package:flutter/foundation.dart';

import 'package:flutter/material.dart';

class DropdownDemo extends StatefulWidget {

  const DropdownDemo({Key? key}) : super(key: key);

  @override

  State<DropdownDemo> createState() => _DropdownDemoState();

}

class _DropdownDemoState extends State<DropdownDemo> {

  String dropdownValue = 'Area of circle';

  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(title: const Text("DDDD")),

      body: Center(

        child: Column(

          children: [


            SizedBox(

              height: 50,

            ),

            // Step 2.

            DropdownButton<String>(

              // Step 3.

              value: dropdownValue,

              // Step 4.

              items: <String>['Area of circle', 'Area of Rectangle', 'Area of triangle ']

                  .map<DropdownMenuItem<String>>((String value) {

                return DropdownMenuItem<String>(

                  value: value,

                  child: Text(

                    value,

                    style: TextStyle(fontSize: 30),

                  ),

                );

              }).toList(),

              // Step 5.

              onChanged: (String? newValue) {

                setState(() {

                  dropdownValue = newValue!;

                });

              },

            ),

            SizedBox(

              height: 20,

            ),

            Text(

              'Selected Value: $dropdownValue',

              style: TextStyle(fontSize: 30, fontWeight: FontWeight.bold),

            ),


          ],

        ),

      ),

    );

  }

}


Richtext example in flutter:

import 'package:flutter/gestures.dart';

import 'package:flutter/material.dart';

class RitchTextExample extends StatelessWidget

{

  @override

  Widget build(BuildContext context) {

    return Scaffold(

     appBar: AppBar(title: Text("Richtext example")),

      body:Container(

    child: Center(

    child: RichText(

    text: TextSpan(

    text: 'Don\'t have an account',

    style: TextStyle(color: Colors.black, fontSize: 20),

    children: <TextSpan>[

    TextSpan(text: ' Sign up',

    style: TextStyle(color: Colors.blueAccent, fontSize: 20),

    recognizer: TapGestureRecognizer()

    ..onTap = () {}

    )

    ]

    ),

    )

      )

    ));

  }

  }

 Slider Widget in Flutter:

import 'package:flutter/material.dart';


class SliderImage extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(title: const Text("Image slider")),

      body: const SliderWidget(),

    );

  }

}


class SliderWidget extends StatefulWidget {

  const SliderWidget({super.key});


  @override

  State<SliderWidget> createState() => _SliderWidgetState();

}


class _SliderWidgetState extends State<SliderWidget> {

  double _currentSliderValue = 0;

  double _imageSize = 50; // Initial image size


  @override

  Widget build(BuildContext context) {

    return Center(

      child: Column(

        mainAxisAlignment: MainAxisAlignment.center,

        children: <Widget>[

          Text(

            'Slider Value: $_currentSliderValue',

            style: TextStyle(fontSize: 20),

          ),

          SizedBox(height: 20),

          Container(

            child: Image.asset("assets/images/congress.png"),

            width: _imageSize,

            height: _imageSize, // Change color as needed

          ),

          SizedBox(height: 20),

          Slider(

            value: _currentSliderValue,

            min: 0,

            max: 100,

            divisions: 10,

            label: _currentSliderValue.round().toString(),

            onChanged: (double value) {

              setState(() {

                _currentSliderValue = value;

                // Update image size based on slider value

                _imageSize = 50 + value; // Adjust this formula as needed

              });

            },

          ),

        ],

      ),

    );

  }

}

Snackbar Example in dart:

import 'package:flutter/material.dart';


class SnackBarPage extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return

      Scaffold(

        appBar: AppBar(

          title: Text('Flutter SnackBar Demo'),

        ),

        body: Center(

      child: TextButton(

        child: Text(

          'Show SnackBar',

          style: TextStyle(fontSize: 25.0),

        ),

        onPressed: () {

          final snackBar = SnackBar(

            content: Text('Hey! This is a SnackBar message.'),

            duration: Duration(seconds: 5),

            action: SnackBarAction(

              label: 'Undo',

              onPressed: () {

                // Some code to undo the change.

              },

            ),

          );

          ScaffoldMessenger.of(context).showSnackBar(snackBar);

        },

      ),

    )

      );

  }

}

Tabbar Example in dart:

import 'package:flutter/foundation.dart';

import 'package:flutter/material.dart';

class TabbarExample extends StatefulWidget {

  const TabbarExample({Key? key}) : super(key: key);

  @override

  State<TabbarExample > createState() => _MyCardExampleState();

}

class FirstScreen extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return Container(

      child: Center(

          child: Text('It is a contact tab, which is responsible for displaying the contacts stored in your mobile',

            style: TextStyle(fontSize: 32.0),

          )

      ),

    );

  }

}


class SecondScreen extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return Container(

      child: Center(

        child: Text('It is a second layout tab, which is responsible for taking pictures from your mobile.',

          style: TextStyle(fontSize: 35.0),

        ),

      ),

    );

  }

}

class _MyCardExampleState extends State<TabbarExample> {

  String dropdownValue = 'Mango';

  @override

  Widget build(BuildContext context) {

    return DefaultTabController(

      length: 3,

      child: Scaffold(

        appBar: AppBar(

          title: Text('Flutter Tabs Demo'),

          bottom: TabBar(

            tabs: [

              Tab(icon: Icon(Icons.contacts), text: "Tab 1"),

              Tab(icon: Icon(Icons.camera_alt), text: "Tab 2"),

              Tab(icon: Icon(Icons.camera_alt), text: "Tab 3")

            ],

          ),

        ),

        body: TabBarView(

          children: [

            FirstScreen(),

            SecondScreen(),

            SecondScreen()

          ],

        ),

      ),

    );

  }

}


Tooltip Example in Flutter:

import 'package:flutter/material.dart';


class ToolTipExample extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return

      Scaffold(

          appBar: AppBar(

            title: Text('Flutter SnackBar Demo'),

          ),

          body: Center(

            child: Tooltip(

              message: 'This is a tooltip',

              child: ElevatedButton(

                onPressed: () {

                  // Button action

                },

                child: Text('Hover over me'),

              ),

            ),

          )

      );

  }

}

Progress bar example in flutter:

import 'dart:async';


import 'package:flutter/material.dart';

class ProgressBarDemo extends StatefulWidget {

  @override

  _ProgressBarDemoState createState() => _ProgressBarDemoState();

}

class _ProgressBarDemoState extends State<ProgressBarDemo> {

  double _progressValue = 0.0;

  bool _loading = false;


  void _startProgress() {

    setState(() {

      _loading = true;

    });


    // Simulate some async operation

    Future.delayed(Duration(seconds: 10), () {

      setState(() {

        _loading = false;

        _progressValue = 0.0; // Reset progress when done

      });

    });


    // Update progress every 100 milliseconds

    const progressIncrement = 0.01;

    Timer.periodic(Duration(milliseconds: 100), (timer) {

      setState(() {

        if (_progressValue < 1.0) {

          _progressValue += progressIncrement;

        } else {

          timer.cancel();

        }

      });

    });

  }


  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(

        title: Text('Progress Bar Demo'),

      ),

      body: Center(

        child: _loading

            ? LinearProgressIndicator(value: _progressValue)

            : ElevatedButton(

          onPressed: _startProgress,

          child: Text('Start Progress'),

        ),

      ),

    );

  }

}


Linear Progress bar example in Flutter:

import 'package:flutter/material.dart';

class ProgressbarExampleWidget extends StatefulWidget {

  @override

  _ProgressbarExampleWidgetState createState() => _ProgressbarExampleWidgetState();

}


class _ProgressbarExampleWidgetState extends State<ProgressbarExampleWidget> {

  bool _loading = false;


  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(

        title: Text('Progress Bar Example'),

      ),

      body: Center(

        child: Container(

          padding: EdgeInsets.all(12.0),

          child: _loading

              ? LinearProgressIndicator()

              : Text("Press button for downloading", style: TextStyle(fontSize: 25)),

        ),

      ),

      floatingActionButton: FloatingActionButton(

        onPressed: () {

          setState(() {

            _loading = !_loading;

          });

        },

        tooltip: 'Download',

        child: Icon(Icons.cloud_download),

      ),

    );

  }

}

Range slider example in flutter:

import 'package:flutter/material.dart';

class RangeSliderDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Sum Program")),
      body: const RangeSliderWidget(),

    );
  }
}
class RangeSliderWidget extends StatefulWidget {
  const RangeSliderWidget({super.key});

  @override
  State<RangeSliderWidget> createState() => _RangeSliderWidgetState();
}

class _RangeSliderWidgetState extends State<RangeSliderWidget> {
  RangeValues _currentRangeValues = const RangeValues(20, 60);
  @override
  Widget build(BuildContext context) {
    return Center(

          child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              mainAxisSize: MainAxisSize.max,
              children: [
                Icon(
                  Icons.volume_up,
                  size: 40,
                ),
                new Expanded(
                    child: RangeSlider(
                      values: _currentRangeValues,
                      min: 0,
                      max: 100,
                      divisions: 10,
                      labels: RangeLabels(
                        _currentRangeValues.start.round().toString(),
                        _currentRangeValues.end.round().toString(),
                      ),
                      onChanged: (RangeValues values) {
                        setState(() {
                          _currentRangeValues = values;
                        });
                      },
                    )
                ),
              ]
          )
      );


  }
}

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