I added to my project Xam.Plugins.Android.ExoPlayer and then I received this error:
java/lang/Object;I)V: defining a default interface method requires --min-sdk-version >= 24 (currently 13) for interface methods: com.google.android.exoplayer2.Player$EventListener.onTimelineChanged : (Lcom/google/android/exoplayer2/Timeline;Ljava/lang/Object;I)V
Looking around, I discovered that other people had the same issue and the problem sits in the Android Options in Project Properties. No Dex compiler was specified, select D8 Dex compiler in the Android project properties:
In code:
<AndroidDexTool>d8</AndroidDexTool>
Happy coding!
Beat challenge 1 (download the game, change the code) here. Then beat challenge 2. First five to beat challenge 3 win $10,000 USD each. No joke.
Challenge 1
This is the first of three challenges for The Last Slice: A retro 8-bit video game that's currently impossible to beat. Clone or download the code, install the prerequisites on your Windows 10 PC, open TheLastSlice.sln file with Visual Studio and run the game. You have the source code...change it any way you'd like to beat the game.
The Prerequisites
Here's what you'll need to get started:
After installing the prerequisites find and open TheLastSlice.sln file with Visual Studio, and run the game.
The Problem
The Last Slice retro video game is fun to play, but impossible to beat as coded. You won’t beat this challenge with just gamer skills. Break out your development skills, change the code and find a way to win the game. The possibilities are endless, and you have the source code...so what’s next is up to you.
The Reward
Solving this challenge gives you instant access to challenge 2, and you'll be one step closer to being one of five lucky participants that could win $10,000 USD.
But hurry - to be eligible to compete in the third and final challenge, you'll need to solve both this challenge and challenge 2 before midnight UTC on July 17, 2018.
Join Craig Dunn explains what’s new in iOS 11 and how to take advantage of the latest updates – from drag-and-drop for iPad to machine learning and more – 100% in .NET and Visual Studio. Whether you’re building new or updating existing Xamarin.iOS apps, you’ll see how to implement new frameworks, APIs, and UI features, walk-through code samples, get expert tips and tricks, so you can start shipping iOS 11-ready apps to your users.
In this webinar, you’ll:
- Explore iOS 11 UI changes, including adapting to the iPhone X form factor
- Dive into what .NET developers need to know about iOS 11
- Add iOS 11 features to new and existing Xamarin apps with step-by-step examples
- Ensure backwards compatibility with prior OS versions
- Learn how to incorporate Azure Machine Learning tools into CoreML
- Ask questions and receive guidance from our team of app experts
To develop for iOS 11, you'll need to have a machine that supports macOS Sierra and Xcode 9.
Download the source code of this video from GitHub.
By default all your data from your previous runs is deleted when you’re deploying an Xamarin.Android app. In many cases you don’t want the data to be deleted.
Visual Studio
To preserve data go to
Tools -> Options -> Xamarin -> Android Settings and check “
Preserve application data/cache on device between deploys”.
Xamarin Studio
To preserve data go to
Tools -> Options -> Android and check “
Preserve data/cache between application deploys”.
Happy coding!
When you open Visual Studio 2015 and there is a pop windows to invite you to click on it for updating Xamarin and you click, nothing happends. There is a bug but clicking the update available popup was fixed in one of the recent releases. You can manually update in the Options menu under Tools.
As for the errors, I get those all the time. Support packages can often be a problem. Update to the latest XF package. Try deleting bin, obj, and the contents of packages folders and rebuild.
Important Currently you cannot enable devices installed with Windows 10 Insider Preview with the System Setting Developer Mode controls as outlined in this article. This feature is not currently supported, but will be enabled in a future release of Windows 10. So you don't need to follow the steps in the future approach in this article. But you must follow the links directly below to enable your specific Windows 10 device.
Enable developer mode
If you use Visual Studio on a Windows 10 desktop and you open a solution for a Windows 8.1 or Windows 10 app, you will be prompted to enable your device with this dialog. (You also need your device to be enabled to use the designers and debug your app.)
When you see this dialog, click OK. Then follow the steps below to enable your desktop from Windows 10 Insider Preview.
For Windows 10 desktop
Use gpedit.msc to set the group policies to enable your device, unless you have Windows 10 Insider Preview Home Edition. If you do have Home Edition, you need to use regedit or PowerShell commands to set the registry keys directly to enable your device.
Use gpedit to enable your device
- Open a cmd prompt with administrator privileges.
- Run Gpedit.msc.
- Go to Local Computer Policy > Computer Configuration > Administrative Templates > Windows Components > App Package Deployment
- Edit the policies to enable the following:
- Allow all trusted apps to install (Enables your device for sideloading apps)
- Allows development of Windows Store apps and installing them from an integrated development environment (IDE) (Enables your device for development from Visual Studio)
- Reboot your machine.
Use regedit to enable your device
- Open a cmd prompt with administrator privileges.
- Run regedit.
- Set the value of this DWORD to 1: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock\AllowAllTrustedApps
- Set the value of this DWORD to 1: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock\AllowDevelopmentWithoutDevLicense
Use PowerShell to enable your device
- Run Windows PowerShell with administrator privileges.
- Run the following command: PS C:\WINDOWS\system32> reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock" /t REG_DWORD /f /v "AllowDevelopmentWithoutDevLicense" /d "1"
- Run this command too: PS C:\WINDOWS\system32> reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock" /t REG_DWORD /f /v "AllowAllTrustedApps" /d "1"
Future approach using System Setting Developer Mode controls
There is a different approach for development for Windows 10 devices. A developer license is no longer required for each device that you want to use to develop, install or test your app. You just enable a device once for these tasks from the settings for the device. That's it. No more renewing your developer licenses every 30 or 90 days!
If you are still using a Windows 8.1 device to develop or test your apps with Visual Studio 2013 or Visual Studio 2015, you still need to get a developer license or register your Windows Phone.
Develop your app with Visual Studio
If you use Visual Studio on a Windows 10 device and you open a solution for a Windows 8.1 or Windows 10 app, you will be prompted to enable your device with this dialog. (You also need your device to be enabled to use the designers and debug your app.)
When you see this dialog, click OK. Then follow the steps below to enable your device from Windows 10 Insider Preview.
Enable your Windows 10 devices
For Windows 10 Insider Preview, you choose what tasks you want to enable on the device. This includes any devices: Windows 10 desktops, tablets and phones. You can enable a device for development, or just sideloading.
Sideloading is installing and then running or testing an app that has not been certified by the Windows store. For example, an app that is internal to your company only. (Does the Windows store allow sideloading?)
Note If you sideload apps, you should still only install apps from trusted sources. When you install a sideloaded app that has not been certified by the Windows store, you are agreeing that you have obtained all rights necessary to sideload these apps and that you are solely responsible for any harm that results from installing and running these apps. See this privacy statement.
Windows 10 Desktops/tablets
-
On your device that you want to enable, go to Settings. Choose Update & security. Then choose For developers.
-
Choose the level that you need. Developer mode allows you to sideload apps too.
Windows 10 Phones
-
On your device that you want to enable, go to Settings. Choose Update & security. Then choose For developers.
-
Choose the level that you need. Developer mode allows you to sideload apps too.