Add intent wedge scanner, MDM support for Android (#863)

Add Android intent wedge scanner support with auto configuration for supported Zebra and Datalogic devices.
Intent wedge scans can be done without pressing the scan button first.

Adds the ability for an MDM server to push settings on Android.

lib/main.dart

@@ -1,16 +1,21 @@
 import "dart:async";
+import "dart:io";
 
+import "package:flutter/foundation.dart";
 import "package:flutter/material.dart";
 import "package:flutter/services.dart";
 
 import "package:adaptive_theme/adaptive_theme.dart";
 import "package:flutter_localizations/flutter_localizations.dart";
 import "package:flutter_localized_locales/flutter_localized_locales.dart";
+import "package:inventree/barcode/barcode.dart";
+import "package:inventree/barcode/wedge_detect.dart";
 import "package:one_context/one_context.dart";
 import "package:package_info_plus/package_info_plus.dart";
 import "package:sentry_flutter/sentry_flutter.dart";
 import "package:inventree/dsn.dart";
 
+import "package:inventree/managed_config.dart";
 import "package:inventree/preferences.dart";
 import "package:inventree/inventree/sentry.dart";
 import "package:inventree/l10n/supported_locales.dart";
@@ -22,7 +27,7 @@ import "package:inventree/widget/home.dart";
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
-  final savedThemeMode = await AdaptiveTheme.getThemeMode();
+  AdaptiveThemeMode? savedThemeMode = await AdaptiveTheme.getThemeMode();
 
   await runZonedGuarded<Future<void>>(
     () async {
@@ -58,6 +63,14 @@ Future<void> main() async {
         );
       };
 
+      // Get any config provided by the MDM server
+      await initManagedConfiguration();
+
+      final AdaptiveThemeMode? managedThemeMode =
+          await getPendingManagedThemeMode();
+
+      if (managedThemeMode != null) savedThemeMode = managedThemeMode;
+
       final int orientation =
           await InvenTreeSettingsManager().getValue(
                 INV_SCREEN_ORIENTATION,
@@ -116,6 +129,27 @@ class InvenTreeAppState extends State<StatefulWidget> {
 
     // Run some async init tasks
     runInitTasks();
+
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      applyPendingThemeMode();
+    });
+  }
+
+  Future<void> applyPendingThemeMode() async {
+    final AdaptiveThemeMode? mode = await getPendingManagedThemeMode();
+
+    if (mode == null) return;
+
+    final BuildContext? ctx = OneContext().context;
+
+    if (ctx == null) return;
+
+    final manager = AdaptiveTheme.maybeOf(ctx);
+
+    if (manager == null) return;
+
+    manager.setThemeMode(mode);
+    await clearPendingManagedThemeMode();
   }
 
   // Run app init routines in the background
@@ -124,6 +158,12 @@ class InvenTreeAppState extends State<StatefulWidget> {
     Locale? locale = await InvenTreeSettingsManager().getSelectedLocale();
     setLocale(locale);
 
+    await initWedgeScannerDefault();
+
+    if (!kIsWeb && Platform.isAndroid) {
+      initGlobalIntentListener();
+    }
+
     // First-run only: seed a demo server profile if none are configured
     await UserProfileDBManager().seedDemoProfileIfNeeded();