adding packages

deprecated/mobile_popup/example/README.md

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+# mobile_popup_example
+
+Demonstrates how to use the mobile_popup plugin.
+
+## Example
+
+``` dart
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+
+import 'package:flutter/foundation.dart'
+    show debugDefaultTargetPlatformOverride;
+import 'package:mobile_popup/mobile_popup.dart';
+
+void main() {
+  _setTargetPlatformForDesktop();
+  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() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: HomeScreen(),
+    );
+  }
+}
+
+class HomeScreen extends StatelessWidget {
+  const HomeScreen({
+    Key key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Popup Example'),
+      ),
+      body: Center(
+        child: RaisedButton(
+          child: Text("Show Popup"),
+          onPressed: () {
+            showMobilePopup(
+              context: context,
+              builder: (context) => MobilePopUp(
+                    title: 'App Settings',
+                    leadingColor: Colors.white,
+                    builder: Builder(
+                      builder: (navigator) => Scaffold(
+                            body: SingleChildScrollView(
+                              child: Column(
+                                children: <Widget>[
+                                  ListTile(
+                                    leading: Icon(Icons.brightness_auto),
+                                    title: Text('Brightness'),
+                                    trailing: Switch.adaptive(
+                                      value: true,
+                                      onChanged: (value) {},
+                                    ),
+                                  ),
+                                  ListTile(
+                                    leading: Icon(Icons.fingerprint),
+                                    title: Text('Fingerprint'),
+                                    trailing: Switch.adaptive(
+                                      value: false,
+                                      onChanged: (value) {},
+                                    ),
+                                  ),
+                                  ListTile(
+                                    leading: Icon(Icons.map),
+                                    title: Text('Navigation'),
+                                    trailing: Switch.adaptive(
+                                      value: true,
+                                      onChanged: (value) {},
+                                    ),
+                                  ),
+                                ],
+                              ),
+                            ),
+                          ),
+                    ),
+                  ),
+            );
+          },
+        ),
+      ),
+    );
+  }
+}
+
+```