Add a bottom navigation bar with a new About page in companion app

Foundation for future improvements, such as standalone operation.

Author: mrrfv

companion_app/android/app/build.gradle

@@ -72,7 +72,7 @@ android {
 }
 
 dependencies {
-    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.3'
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.1.4'
 }
 
 flutter {

companion_app/android/settings.gradle

@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "8.2.2" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "2.1.0" apply false
 }
 

companion_app/lib/info_screen.dart

@@ -0,0 +1,86 @@
+import 'package:flutter/material.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+class InfoScreen extends StatelessWidget {
+  const InfoScreen({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return SingleChildScrollView(
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: <Widget>[
+          Row(
+            children: const [
+              Icon(Icons.backup, size: 28, color: Colors.green),
+              SizedBox(width: 8),
+              Text(
+                "Open Android Backup",
+                style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
+              ),
+            ],
+          ),
+          const SizedBox(height: 8),
+          const Text(
+            "Open Android Backup is a tiny shell script & Flutter app that makes securely backing up Android devices easy, without vendor lock-ins or using closed-source software that could put your data at risk.",
+          ),
+          const SizedBox(height: 24),
+          Row(
+            children: const [
+              Icon(Icons.info_outline, size: 28, color: Colors.green),
+              SizedBox(width: 8),
+              Text(
+                "About this app",
+                style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
+              ),
+            ],
+          ),
+          const SizedBox(height: 8),
+          const Text(
+            "The Open Android Backup companion app allows for backups of data not normally accessible through adb. No data is uploaded to a remote server: it is saved to the internal storage and then read by the script running on your computer.",
+          ),
+          const SizedBox(height: 24),
+          Row(
+            children: const [
+              Icon(Icons.code, size: 28, color: Colors.green),
+              SizedBox(width: 8),
+              Text(
+                "Open Source",
+                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+              ),
+            ],
+          ),
+          const SizedBox(height: 8),
+          const Text(
+            "Both the app and script are open-source and available on GitHub. Contributions are welcome!",
+          ),
+          const SizedBox(height: 16),
+          Padding(
+            padding: const EdgeInsets.symmetric(vertical: 8.0),
+            child: InkWell(
+              onTap: () async {
+                final url = Uri.parse('https://github.com/mrrfv/open-android-backup');
+                await launchUrl(url, mode: LaunchMode.externalApplication);
+              },
+              child: Row(
+                mainAxisSize: MainAxisSize.min,
+                children: const [
+                  Icon(Icons.link, color: Colors.green),
+                  SizedBox(width: 6),
+                  Text(
+                    'View on GitHub',
+                    style: TextStyle(
+                      color: Colors.green,
+                      decoration: TextDecoration.underline,
+                      fontWeight: FontWeight.bold,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}