How to use ext to specify platform in maui?

Question

I know to create custom controls I need create Viewhandlers and create viewHandler PropertyMap and CommandMapper in each platform android ios or others

I create a folder MyEntry and create ViewHandler MyEntryHandler.cs and MyEntryHandler.Android.cs and MyEntryHandler.iOS.cs which are partial class.

but still tell me can not find namespace of Androidx means I can not use AndroidX in MyEntryHandler.Android.cs

  public partial class PoEntryHandler : ViewHandler<Controls.MyEntry, MyEntryHandler> 
{
     protected override AndroidX.AppCompat.Widget.AppCompatEditText CreatePlatformView() {
          return new AndroidX.AppCompat.Widget.AppCompatEditText(); 
     }
}

why?

Answer 1

Hello,

Because iOS and Windows platform do not have AndroidX.AppCompat.Widget.AppCompatEditText class.

To fix this error, you can refer to following steps.

Firstly, you need to add conditional-compilation for android namespace in your MyEntryHandler.Android.cs like following code.

#if  ANDROID

using AndroidX.AppCompat.Widget;
using Android.Content;


#endif

Then, Configure filename-based multi-targeting, open your .csprj file, add xml code from above document as children of the <Project> node, this error will disappear.The build system will know: Don't compile C# code whose filename ends with .Android.cs, if you aren't building for Android.

Best Regards, Leon Lu

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Answer 2

public partial class PoEntryHandler : ViewHandler<Controls.MyEntry, MyEntryHandler> { protected override AndroidX.AppCompat.Widget.AppCompatEditText CreatePlatformView() { return new AndroidX.AppCompat.Widget.AppCompatEditText(); } }