修复启动屏延时过长的问题；修复主页按返回键后，恢复时错误加载启动页的问题；调整主页模式为SingleTask。

projects/Demo/Demo.Android/MainActivity.cs

@@ -5,7 +5,7 @@ using LibVLCSharp.Forms.Shared;
 
 namespace Demo.Droid
 {
-    [Activity(Label = "Demo", Icon = "@mipmap/icon", Theme = "@style/MainTheme", ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
+    [Activity(Label = "Demo", Icon = "@mipmap/icon", Theme = "@style/MainTheme", ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation, LaunchMode = LaunchMode.SingleTask)]
     public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
     {
         protected override void OnCreate(Bundle savedInstanceState)
@@ -25,5 +25,10 @@ namespace Demo.Droid
         {
             ZXing.Net.Mobile.Android.PermissionsHandler.OnRequestPermissionsResult(requestCode, permissions, grantResults);
         }
+
+        public override void OnBackPressed()
+        {
+            this.MoveTaskToBack(true);
+        }
     }
 }

projects/Demo/Demo.Android/SplashActivity.cs

@@ -2,7 +2,6 @@
 using Android.Content;
 using Android.OS;
 using Android.Support.V7.App;
-using Android.Util;
 using System.Threading.Tasks;
 
 namespace Demo.Droid
@@ -10,15 +9,11 @@ namespace Demo.Droid
     [Activity(Theme = "@style/MyTheme.Splash", MainLauncher = true, NoHistory = true)]
     public class SplashActivity : AppCompatActivity
     {
-        private static readonly string TAG = "X:" + typeof(SplashActivity).Name;
-
         public override void OnCreate(Bundle savedInstanceState, PersistableBundle persistentState)
         {
             base.OnCreate(savedInstanceState, persistentState);
-            Log.Debug(TAG, "SplashActivity.OnCreate");
         }
 
-        // Launches the startup task
         protected override void OnResume()
         {
             base.OnResume();
@@ -26,14 +21,10 @@ namespace Demo.Droid
             startupWork.Start();
         }
 
-        // Simulates background work that happens behind the splash screen
         private async void SimulateStartup()
         {
-            Log.Debug(TAG, "Performing some startup work that takes a bit of time.");
-            await Task.Delay(8000); // Simulate a bit of startup work.
-            Log.Debug(TAG, "Startup work is finished - starting MainActivity.");
+            await Task.Delay(1);
             StartActivity(new Intent(Application.Context, typeof(MainActivity)));
         }
-        public override void OnBackPressed() { }
     }
 }