sharee.bike-App/ShareeBike/ShareeBike.Android/MainActivity.cs

using System.Collections.Generic;
using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Content.Res;
using Android.OS;
using Android.Util;
using Firebase;
using Java.Interop;
using Java.Security.Acl;
using Plugin.Permissions;
using Xamarin.Forms.Platform.Android.AppLinks;
using static Xamarin.Essentials.Permissions;
using Xamarin.Essentials;
using Android.Runtime;
using Xamarin.Forms;

namespace ShareeBike.Droid
{
	[Activity(
		Label = "Sharee",
		Icon = "@drawable/app_logo",
		Theme = "@style/MainTheme",
		MainLauncher = true,
		ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]

	[IntentFilter(new[] { Intent.ActionView },
			  Categories = new[] { Intent.ActionView, Intent.CategoryBrowsable, Intent.CategoryDefault },
			  DataScheme = "https",
			  DataHost = "app.sharee.bike",
			  DataPathPrefix = "/App-shareebike",
			  AutoVerify = true)]

	[IntentFilter(new[] { Intent.ActionView },
			  Categories = new[] { Intent.ActionView, Intent.CategoryBrowsable, Intent.CategoryDefault },
			  DataScheme = "http",
			  DataHost = "app.sharee.bike",
			  DataPathPrefix = "/App-shareebike",
			  AutoVerify = true)]

	public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
	{
		private void initFontScale()
		{
			Configuration configuration = Resources.Configuration;
			configuration.FontScale = (float)1;
			//0.85 small, 1 standard, 1.15 big，1.3 more bigger ，1.45 supper big 
			DisplayMetrics metrics = new DisplayMetrics();
			WindowManager.DefaultDisplay.GetMetrics(metrics);
			metrics.ScaledDensity = configuration.FontScale * metrics.Density;
			BaseContext.Resources.UpdateConfiguration(configuration, metrics);
		}
		protected override async void OnCreate(Bundle bundle)
		{
			initFontScale();

			TabLayoutResource = Resource.Layout.Tabbar;
			ToolbarResource = Resource.Layout.Toolbar;

			base.OnCreate(bundle);

			global::Xamarin.Forms.Forms.Init(this, bundle);

			FirebaseApp.InitializeApp(this);
			AndroidAppLinks.Init(this);

			// Initialize xamarin.essentials, see https://docs.microsoft.com/en-us/xamarin/essentials/get-started?tabs=macos%2Candroid.
			Xamarin.Essentials.Platform.Init(this, bundle);

			// Required for initialization of Maps, see https://developer.xamarin.com/guides/xamarin-forms/user-interface/map/
			Xamarin.FormsGoogleMaps.Init(this, bundle);

			// Required for initialization of binding package, see  https://github.com/nuitsjp/Xamarin.Forms.GoogleMaps.Bindings.
			Xamarin.FormsGoogleMapsBindings.Init();

			// Get version name of app.
			Context context = ApplicationContext;
			new Model.Device.AppInfo(context.PackageManager.GetPackageInfo(context.PackageName, 0).VersionName);

			Xamarin.Forms.Forms.ViewInitialized += (object sender, Xamarin.Forms.ViewInitializedEventArgs e) =>
			{
				if (!string.IsNullOrWhiteSpace(e.View.AutomationId))
				{
					e.NativeView.ContentDescription = e.View.AutomationId;
				}
			};

			await Permissions.RequestAsync<Permissions.LocationWhenInUse>();
			await Permissions.RequestAsync<BLEPermissions>();

			LoadApplication(new App());
		}

		//Bluetooth Permission on Android 12 "Detect Devices nearby"
		// https://stackoverflow.com/questions/71028853/xamarin-forms-ble-plugin-scan-issue-android-12
		public class BLEPermissions : BasePlatformPermission
		{
			public override (string androidPermission, bool isRuntime)[] RequiredPermissions => new List<(string androidPermission, bool isRuntime)>
			{
				(Android.Manifest.Permission.BluetoothScan, true),
				(Android.Manifest.Permission.BluetoothConnect, true),
			}.ToArray();
		}

		/// <summary>
		/// Handles opening the dialog to request for permissions.
		/// </summary>
		public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
		{
			Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
			PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);

			base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
		}

		[Export("TapStation")]
		public void TapStation(string stationNr)
		{
			BackdoorMethodHelpers.DoTapPage(stationNr);
		}
	}
}