packages.dart/deprecated/get_version/example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get_version/get_version.dart';

import 'dart:io' show Platform;
import 'package:flutter/foundation.dart';

// The existing imports
// !! Keep your existing impots here !!

/// main is entry point of Flutter application
void main() {
  // Desktop platforms aren't a valid platform.
  _setTargetPlatformForDesktop();

  return runApp(MyApp());
}

/// If the current platform is desktop, override the default platform to
/// a supported platform (iOS for macOS, Android for Linux and Windows).
/// Otherwise, do nothing.
void _setTargetPlatformForDesktop() {
  TargetPlatform targetPlatform;
  if (Platform.isMacOS) {
    targetPlatform = TargetPlatform.iOS;
  } else if (Platform.isLinux || Platform.isWindows) {
    targetPlatform = TargetPlatform.android;
  }
  if (targetPlatform != null) {
    debugDefaultTargetPlatformOverride = targetPlatform;
  }
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  String _projectVersion = '';
  String _projectCode = '';
  String _projectAppID = '';
  String _projectName = '';

  @override
  void initState() {
    _initPlatformState();
    super.initState();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  void _initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion = await GetVersion.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    String projectVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      projectVersion = await GetVersion.projectVersion;
    } on PlatformException {
      projectVersion = 'Failed to get project version.';
    }

    String projectCode;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      projectCode = await GetVersion.projectCode;
    } on PlatformException {
      projectCode = 'Failed to get build number.';
    }

    String projectAppID;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      projectAppID = await GetVersion.appID;
    } on PlatformException {
      projectAppID = 'Failed to get app ID.';
    }

    String projectName;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      projectName = await GetVersion.appName;
    } on PlatformException {
      projectName = 'Failed to get app name.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
      _projectVersion = projectVersion;
      _projectCode = projectCode;
      _projectAppID = projectAppID;
      _projectName = projectName;
    });
  }

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
        appBar: new AppBar(
          title: const Text('Get Version Example'),
        ),
        body: new SingleChildScrollView(
          child: new ListBody(
            children: <Widget>[
              new Container(
                height: 10.0,
              ),
              new ListTile(
                leading: const Icon(Icons.info),
                title: const Text('Name'),
                subtitle: new Text(_projectName),
              ),
              const Divider(height: 20.0),
              new ListTile(
                leading: const Icon(Icons.info),
                title: const Text('Running on'),
                subtitle: new Text(_platformVersion),
              ),
              const Divider(height: 20.0),
              new ListTile(
                leading: const Icon(Icons.info),
                title: const Text('Version Name'),
                subtitle: new Text(_projectVersion),
              ),
              const Divider(height: 20.0),
              new ListTile(
                leading: const Icon(Icons.info),
                title: const Text('Version Code'),
                subtitle: new Text(_projectCode),
              ),
              const Divider(height: 20.0),
              new ListTile(
                leading: const Icon(Icons.info),
                title: const Text('App ID'),
                subtitle: new Text(_projectAppID),
              ),
            ],
          ),
        ),
      ),
    );
  }
}