I'm trying to add a network security config file to an Android app built with Xamarin tools. (Xamarin forms version 2.5.1.527436).
I followed the steps in this article: https://devblogs.microsoft.com/xamarin/cleartext-http-android-network-security/
My network_security.config.xml file just contain two TLS overrides for sites accessed by an in-app browser, and where https/tls can't be enabled server-side at this point:
<?xml version="1.0" encoding="utf-8" ?> <network-security-config> <domain-config cleartextTrafficPermitted="true"> <domain includeSubdomains="true">xxx.somedomain.com</domain> <domain includeSubdomains="true">yyy.somedomain.com</domain> </domain-config> </network-security-config> In the AndroidManifest.xml file I just added android:networkSecurityConfig="@xml/network_security_config":
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.somecompany.someapp" android:versionName="1.2.3 (October 2019)" android:versionCode="3" android:installLocation="auto"> <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="28" /> ... <application android:largeHeap="true" android:label="Some App Name" android:icon="@drawable/icon" android:theme="@style/AppTheme" android:networkSecurityConfig="@xml/network_security_config"> ... </application> </manifest> However, on startup, the call to Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication throws a null reference exception without any further details.
[0:] System.NullReferenceException: Object reference not set to an instance of an object. at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage (Xamarin.Forms.Page page) [0x0005e] in D:\agent_work\1\s\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:315 at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.SetMainPage () [0x00000] in D:\agent_work\1\s\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:343 at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication (Xamarin.Forms.Application application) [0x0025c] in D:\agent_work\1\s\Xamarin.Forms.Platform.Android\AppCompat\FormsAppCompatActivity.cs:139 at SomeApp.MainActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x001db] in D:\work\xxx\MainActivity.cs:173 I'm not sure if I am missing something, or if there is some Xamarin version dependency involved when adding a network security config file..? Any ideas?
