tsacdop-podcast-app-android/lib/home/about.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:tsacdop/util/custompaint.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:line_icons/line_icons.dart';

const String version = '0.3.2';

class AboutApp extends StatelessWidget {
  _launchUrl(String url) async {
    if (await canLaunch(url)) {
      await launch(url);
    } else {
      throw 'Could not launch $url';
    }
  }

  Widget _listItem(
          BuildContext context, String text, IconData icons, String url) =>
      InkWell(
        onTap: () => _launchUrl(url),
        child: Container(
          height: 50.0,
          padding: EdgeInsets.symmetric(horizontal: 20.0),
          alignment: Alignment.centerLeft,
          decoration: BoxDecoration(
            border: Border(
              bottom: Divider.createBorderSide(context),
            ),
          ),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              Icon(icons, color: Theme.of(context).accentColor),
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 10),
              ),
              Text(text),
            ],
          ),
        ),
      );

  @override
  Widget build(BuildContext context) {
    OverlayEntry _createOverlayEntry(TapDownDetails detail) {
      // RenderBox renderBox = context.findRenderObject();
      var offset = detail.globalPosition;
      return OverlayEntry(
        builder: (constext) => Positioned(
          left: offset.dx - 5,
          top: offset.dy - 120,
          child: Container(
              width: 20,
              height: 120,
              color: Colors.transparent,
              alignment: Alignment.topCenter,
              child: HeartSet(height: 120, width: 20)),
        ),
      );
    }

    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: SystemUiOverlayStyle(
        statusBarIconBrightness: Theme.of(context).accentColorBrightness,
        systemNavigationBarColor: Theme.of(context).primaryColor,
        systemNavigationBarIconBrightness:
            Theme.of(context).accentColorBrightness,
      ),
      child: Scaffold(
          backgroundColor: Theme.of(context).primaryColor,
          appBar: AppBar(
            title: Text('About'),
          ),
          body: SafeArea(
            child: SingleChildScrollView(
              scrollDirection: Axis.vertical,
              child: Padding(
                padding: const EdgeInsets.all(20.0),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: <Widget>[
                    Container(
                      height: 200.0,
                      alignment: Alignment.center,
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        mainAxisSize: MainAxisSize.min,
                        children: <Widget>[
                          Image(
                            image: AssetImage('assets/logo.png'),
                            height: 80,
                          ),
                          Text('Version: $version'),
                        ],
                      ),
                    ),
                    Container(
                      padding: EdgeInsets.symmetric(horizontal: 50),
                      child: Text(
                        'Tsacdop is a podcast player developed in flutter, a clean, simply beautiful and friendly app.',
                        textAlign: TextAlign.center,
                      ),
                    ),
                    Padding(
                      padding: EdgeInsets.all(10.0),
                    ),
                    Container(
                      padding: EdgeInsets.only(top: 20.0, bottom: 10.0),
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.all(Radius.circular(10)),
                        border: Border.all(
                            color: Theme.of(context).accentColor, width: 1),
                      ),
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.start,
                        mainAxisSize: MainAxisSize.min,
                        children: <Widget>[
                          Container(
                            padding: EdgeInsets.symmetric(horizontal: 20.0),
                            alignment: Alignment.centerLeft,
                            child: Text(
                              'Developer',
                              style: TextStyle(
                                  color: Theme.of(context).accentColor),
                            ),
                          ),
                          _listItem(context, 'Twitter', LineIcons.twitter,
                              'https://twitter.com/shimenmen'),
                          _listItem(context, 'GitHub', LineIcons.github_alt,
                              'https://github.com/stonega'),
                          _listItem(context, 'Medium', LineIcons.medium,
                              'https://medium.com/@stonegate'),
                        ],
                      ),
                    ),
                    //Spacer(),
                    Padding(
                      padding: EdgeInsets.symmetric(vertical: 50),
                    ),
                    Container(
                      height: 50,
                      alignment: Alignment.center,
                      child: GestureDetector(
                        onTapDown: (detail) async {
                          OverlayEntry _overlayEntry;
                          _overlayEntry = _createOverlayEntry(detail);
                          Overlay.of(context).insert(_overlayEntry);
                          await Future.delayed(Duration(seconds: 2));
                          _overlayEntry?.remove();
                        },
                        child: Row(
                          crossAxisAlignment: CrossAxisAlignment.center,
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: <Widget>[
                            Image.asset(
                              'assets/text.png',
                              height: 25,
                            ),
                            Padding(
                              padding: EdgeInsets.symmetric(horizontal: 5),
                            ),
                            Icon(
                              Icons.favorite,
                              color: Colors.blue,
                            ),
                            Padding(
                              padding: EdgeInsets.symmetric(horizontal: 5),
                            ),
                            FlutterLogo(
                              size: 18,
                            ),
                          ],
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          )),
    );
  }
}