Progress on basic UI for testing

lib/pages/add_app.dart

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+import 'package:flutter/material.dart';
+import 'package:obtainium/pages/app.dart';
+import 'package:obtainium/services/apps_provider.dart';
+import 'package:obtainium/services/source_service.dart';
+import 'package:provider/provider.dart';
+
+class AddAppPage extends StatefulWidget {
+  const AddAppPage({super.key});
+
+  @override
+  State<AddAppPage> createState() => _AddAppPageState();
+}
+
+class _AddAppPageState extends State<AddAppPage> {
+  final _formKey = GlobalKey<FormState>();
+  final urlInputController = TextEditingController();
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Obtainium - Add App'),
+      ),
+      body: Center(
+          child: Form(
+        key: _formKey,
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            TextFormField(
+              controller: urlInputController,
+              validator: (value) {
+                if (value == null ||
+                    value.isEmpty ||
+                    Uri.tryParse(value) == null) {
+                  return 'Please enter a supported source URL';
+                }
+                return null;
+              },
+            ),
+            Padding(
+              padding: const EdgeInsets.symmetric(vertical: 16.0),
+              child: ElevatedButton(
+                onPressed: () {
+                  if (_formKey.currentState!.validate()) {
+                    SourceService()
+                        .getApp(urlInputController.value.text)
+                        .then((app) {
+                      var appsProvider = context.read<AppsProvider>();
+                      appsProvider.saveApp(app).then((_) {
+                        Navigator.push(
+                            context,
+                            MaterialPageRoute(
+                                builder: (context) => AppPage(appId: app.id)));
+                      });
+                    }).catchError((e) {
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(content: Text(e.toString())),
+                      );
+                    });
+                  }
+                },
+                child: const Text('Add'),
+              ),
+            ),
+          ],
+        ),
+      )),
+    );
+  }
+}

lib/pages/app.dart

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+import 'package:flutter/material.dart';
+import 'package:obtainium/services/apps_provider.dart';
+import 'package:obtainium/services/source_service.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+import 'package:provider/provider.dart';
+
+class AppPage extends StatefulWidget {
+  const AppPage({super.key, required this.appId});
+
+  final String appId;
+
+  @override
+  State<AppPage> createState() => _AppPageState();
+}
+
+class _AppPageState extends State<AppPage> {
+  @override
+  Widget build(BuildContext context) {
+    var appsProvider = context.watch<AppsProvider>();
+    App? app = appsProvider.apps[widget.appId];
+    if (app == null) {
+      Navigator.pop(context);
+    }
+    return Scaffold(
+        appBar: AppBar(
+          title: Text('App - ${app?.name} - ${app?.author}'),
+        ),
+        body: WebView(
+          initialUrl: app?.url,
+        ));
+  }
+}

lib/pages/apps.dart

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+import 'package:flutter/material.dart';
+import 'package:obtainium/pages/add_app.dart';
+import 'package:obtainium/services/apps_provider.dart';
+import 'package:provider/provider.dart';
+
+class AppsPage extends StatefulWidget {
+  const AppsPage({super.key});
+
+  @override
+  State<AppsPage> createState() => _AppsPageState();
+}
+
+class _AppsPageState extends State<AppsPage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Obtainium - Apps'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: () {
+            var appsProvider = context.watch<AppsProvider>();
+            if (appsProvider.loadingApps) {
+              return [const Text('Loading Apps...')];
+            } else if (appsProvider.apps.isEmpty) {
+              return [const Text('No Apps Yet.')];
+            } else {
+              return appsProvider.apps.values.map((e) => Text(e.id)).toList();
+            }
+          }(),
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {
+          Navigator.push(
+            context,
+            MaterialPageRoute(builder: (context) => const AddAppPage()),
+          );
+        },
+        tooltip: 'Add App',
+        child: const Icon(Icons.add),
+      ),
+    );
+  }
+}