Accessing DisplayMetrics At Design Time

Question

I have a custom control in my Xamarin.Android app that includes the following property:

public bool WrapTakenString
{
    get { return this._wraptakenstring; }
    set
    {
        this._wraptakenstring = value;
        this.txtTaken.LayoutParameters.Width = this.WrapTakenString ? (int)TypedValue.ApplyDimension(ComplexUnitType.Sp, 125, Application.Context.Resources.DisplayMetrics) : LayoutParams.WrapContent;
    }
}

This works fine during runtime, but if I set it to true during design time, I receive an error in the designer. This leads me to believe that Application.Context.Resources.DisplayMetrics cannot be accessed during design time. However, I am not sure what to replace it with that can be accessed during design time. What should I do?

Answer 1

Hello @Nathan Sokalski ,​

Welcome to our Microsoft Q&A platform!

but if I set it to true during design time, I receive an error in the designer. T

I created a basic to test the code, it works as expected. After changing the layoutParameter, we need to reset it for the view. Check the code:

   private bool isWorked;  
   public bool IsWorked  
   {  
       get { return isWorked; }  
       set  
       {  
           this.isWorked = value;  
           var layoutParameter = text.LayoutParameters;  
           layoutParameter.Width = IsWorked ? (int)TypedValue.ApplyDimension(ComplexUnitType.Sp, 125, Application.Context.Resources.DisplayMetrics) : LayoutParams.WrapContent;  
           text.LayoutParameters = layoutParameter;  
       }  
   }  

Best Regards,

Jarvan Zhang

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