ITブログ時々なんでもブログ

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item>
    <color android:color="@color/splash_background"/>
  </item>
  <item>
    <bitmap
        android:src="@drawable/splash_logo"
        android:tileMode="disabled"
        android:gravity="center"/>
  </item>
</layer-list>

<?xml version="1.0" encoding="UTF-8"?>
<resources>
  <style name="MyTheme.Splash" parent ="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">@drawable/splash_screen</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowActionBar">true</item>
  </style>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <color name="splash_background">#FFFFFF</color>
</resources>

using System.Threading.Tasks;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Support.V7.App;
using Android.Util;
namespace AppName.Droid
{
    [Activity(Theme = "@style/MyTheme.Splash", 
              MainLauncher = true, 
              NoHistory = true)]
    public class SplashActivity : AppCompatActivity
    {
        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();
            Task startupWork = new Task(() => { SimulateStartup(); });
            startupWork.Start();
        }

        // Simulates background work that happens behind the splash screen
        async void SimulateStartup()
        {
            Log.Debug(TAG, "Performing some startup work that takes a bit of time.");
            //非同期のスリープが無いとResume時にスプラッシュスクリーンが表示されない。
            await Task.Delay(1000); // Simulate a bit of startup work.
            Log.Debug(TAG, "Startup work is finished - starting MainActivity.");
            StartActivity(new Intent(Application.Context, typeof(MainActivity)));
        }
    }
}