Fixed: Unhandled Exception: Java.Lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.ContentFrameLayout.setId(int)' on a null object reference occurred

In my scenario:

I've just set up a new app using Xamarin int he latest version of Microsoft Visual Studio and all NuGet packages are up to date, but after deploying to my test device I'm presented with 'Unhandled Exception: Java.Lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.ContentFrameLayout.setId(int)' on a null object reference occurred', without spending too much time trying to debug the very much apparent Xamarin bug, I decided to take to Google.

Solution:

The only reason I'm posting this here is because it's a fairly awkward one to find on Google, and should prove a pretty easy and quick fix for most people is to change your Android application manifest from within Visual Studio to point to a newer target android version, such as Android 9.0 (API Level 28 - Pie) and a less obscure minimum version such as Android 4.4 (API Level 19 - Kit Kat).

Xamarin Android Manifest Settings to fix bug

As you can see from the image above, it's a simple fix, but once you save the project, you might have to reload it.

See also:

https://github.com/jamesmontemagno/MediaPlugin/issues/110#issuecomment-379917744


Published at

Tags: Xamarin,C#

Luke Alderton

Comments

Post a comment
Sit tight...
We're adding your comment.
Thank you.
Your comment has been added.
There's been a problem.
Please try again later.
Share with
Tags
Latest Comments
By Mr. Greymatter on Raspberry Pi - Running Java app on Raspbian
16 Feb 2021, 07:35 AM
By Mikko Seittenranta on Xamarin Forms multiple instances of same app open
16 Feb 2021, 04:34 AM
By Andrew on Auto/Custom height on Xamarin Forms WebView for Android and iOS
22 Jan 2021, 22:15 PM
By Rrrft on JQuery Unobtrusive Validation for dynamically created elements
5 Dec 2020, 09:18 AM
By Nick on Raspberry Pi - Running Java app on Raspbian
14 Oct 2020, 19:37 PM
By Ivan on Fixed: Value cannot be null Parameter Name: source
15 Sep 2020, 19:47 PM
By Anand on Raspberry Pi - Bluetooth using Bluecove on Raspbian
7 Sep 2020, 16:53 PM
By Aquif on Xamarin Forms - Working with threads
9 Jul 2020, 13:50 PM
Categories
App Development
Event
Game Development
Mapping
Modelling
Programming
Review
Robotics
Tutorial
Web Development