Receive App Install/Uninstall Broadcasts in MAUI Android

Android 8.0 and earlier (untested)
Simply create a broadcast receiver class.

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[BroadcastReceiver(Enabled = true, Exported = true)]
[IntentFilter([Intent.ActionPackageAdded, Intent.ActionPackageReplaced, Intent.ActionPackageRemoved], DataScheme = "package")]
public class APKBroadcastReceiver : BroadcastReceiver
{
    public override void OnReceive(Context? context, Intent? intent)
    {
        Toast.MakeText(context, "APK installing...", ToastLength.Long)?.Show();
    }
}

Android 8.0 and later
Many static broadcasts are no longer available after Android 8.0. To receive broadcasts for app installation, replacement, or removal, dynamic registration is required.
Create a broadcast receiver class.

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public class APKBroadcastReceiver : BroadcastReceiver
{
    public override void OnReceive(Context? context, Intent? intent)
    {
        Toast.MakeText(context, "APK installing...", ToastLength.Long)?.Show();
    }
}

Add the following code in the overridden OnCreate method of the MainActivity class.

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IntentFilter intentFilter = new IntentFilter();
intentFilter.AddAction(Intent.ActionPackageAdded);
intentFilter.AddAction(Intent.ActionPackageRemoved);
intentFilter.AddAction(Intent.ActionPackageReplaced);
intentFilter.AddAction(Intent.ActionPackageInstall);
intentFilter.AddDataScheme("package");
APKBroadcastReceiver apkBroadcastReceiver = new APKBroadcastReceiver();
RegisterReceiver(apkBroadcastReceiver, intentFilter);