我需要避免 android-12 API Xamarin 表单中的双闪屏问题

Question

SplashActivity.cs

namespace Splash12.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.");
            await Task.Delay(8000); // Simulate a bit of startup work.
            Log.Debug(TAG, "Startup work is finished - starting MainActivity.");
            StartActivity(new Intent(Application.Context, typeof(MainActivity)));
        }
     }
}

MainActivity.cs

[Activity(Label = "Splash12", Theme = "@style/MainTheme", Icon = "@mipmap/icon", MainLauncher = false, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize )]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
        LoadApplication(new App());
    }
    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

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

}

styles.xml

<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>

splash_screen.xml

Answer 1

在 Android 12 中，它有自己的启动屏幕，这是 Android 提供加载视图以等待应用程序启动的方式。

因此，您添加另一个启动屏幕会导致您有两个启动屏幕的问题。

要解决此问题，您可以将以下代码添加到您的

style.xml

。

<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>

        <item name="android:windowIsTranslucent">true</item>
</style>

这段代码

<item name="android:windowIsTranslucent">true</item>

可以让Android 12的闪屏变得透明。所以你只能看到你的启动屏幕。

Answer 2

这不是在 Android 12 上制作闪屏的方法。

查看示例 XamarinBasicSplashScreen，网址为 https://github.com/gmck/XamarinBasicSplashScreen。

有关更多文档https://developer.android.com/develop/ui/views/launch/splash-screen/migrate