Migrate Android app using Xamarin.Android.Support.v4 to .NET6

Question

Hi,
I have a Xamarin.Android game, which I am trying to port to .NET6
I have a dependency on Xamarin.Android.Support.v4 - which provides functionality described below:

Android.Support.V4.View:

• IOnApplyWindowInsetsListener
• ViewCompat.SetOnApplyWindowInsetsListener

Android.Support.V4.Content:

• ContextCompat.CheckSelfPermission
• FileProvider.GetUriForFile

I want to continue targeting API 32 with minimal version set to API 19.
What do I need to reference instead? Many thanks for any useful tips!

Answer 1

Hello,

For using those APIs you mentioned, you could refer to the following documentations:

AndroidX.Core.View

• OnApplyWindowInsetsListener
• [ViewCompat.SetOnApplyWindowInsetsListener](https://developer.android.google.cn/reference/androidx/core/view/ViewCompat#setOnApplyWindowInsetsListener(android.view.View,androidx.core.view.OnApplyWindowInsetsListener\))

AndroidX.Core.Content:

• [ContextCompat.CheckSelfPermission](https://developer.android.google.cn/reference/kotlin/androidx/core/content/ContextCompat#checkSelfPermission(android.content.Context,java.lang.String\))
• [FileProvider.GetUriForFile](https://developer.android.google.cn/reference/androidx/core/content/FileProvider#getUriForFile(android.content.Context,java.lang.String,java.io.File\))

And here are the samples of using the APIs in Xamarin.Forms on Android platform:

Implement IOnApplyWindowInsetsListener:

   public class RootViewDeferringInsetsCallback : WindowInsetsAnimationCompat.Callback, IOnApplyWindowInsetsListener  
   {  
       public RootViewDeferringInsetsCallback(int dispatchMode) : base(dispatchMode)  
       {  
       }  
       public WindowInsetsCompat OnApplyWindowInsets(View v, WindowInsetsCompat insets)  
       {  
       }  
       public override WindowInsetsCompat OnProgress(WindowInsetsCompat insets, IList<WindowInsetsAnimationCompat> runningAnimations)  
       {  
       }  
   }  

ViewCompat.SetOnApplyWindowInsetsListener:

   RootViewDeferringInsetsCallback callback = new RootViewDeferringInsetsCallback(WindowInsetsAnimationCompat.Callback.DispatchModeStop);  
   ViewCompat.SetOnApplyWindowInsetsListener(your_view, callback);  

ContextCompat.CheckSelfPermission:

   var selfPermission = ContextCompat.CheckSelfPermission(this, Manifest.Permission.Camera);  
   if (selfPermission == Permission.Granted)  
   {  
     
   }  
   else  
   {  
     
   }  

FileProvider.GetUriForFile:

At first, please refer to FileProvider to configure your FileProvider.
Then, in you Xamarin project, you could use the following code to call FileProvider.GetUriForFile:

   File imagePath = new File(FilesDir, "my_images");  
   File newFile = new File(imagePath, "default_image.jpg");  
   Android.Net.Uri contentUri = FileProvider.GetUriForFile(this, "com.mydomain.fileprovider", newFile);  

Best Regards,

Alec Liu.

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