Application Current Width

Question

public partial class GridLayoutPage : ContentPage
{
  protected override void OnSizeAllocated(double width, double height) 
  { 
    base.OnSizeAllocated(width, height); 
 
    if (width > 0 && pageWidth != width) 
    {       
        var size = Application.Current.MainPage.Width / listView.ItemSize; 
        gridLayout.SpanCount = (int)size; 
        listView.LayoutManager = gridLayout; 
     } 
  }
}Application.Current.MainPage.Width show -1 , please ad

Suthi Yuvaraj · Answer

Hi Anson,We suspect that you have initialized the MainPage as
AppShell in App.xaml.cs, we suggest you to set the MainPage as page which you
want to get the size , Please refer the below code snippet for more
understanding Code snippet:

public partial class App :
  Application
  {
        
  public App()
        
  {
              
  InitializeComponent();

MainPage = new
  MainPage();
        
  }
  }

Also If you want to initialize
the MainPage as AppShell , you can get the width from the mainPage, we have
attached the code snippet for more reference.Code snippet:

protected override void OnSizeAllocated(double width, double height)
  { 
      base.OnSizeAllocated(width,
  height); 
      if (width > 0 &&
  pageWidth != width) 
      { 
          var size = this.Width /
  listView.ItemSize;
         
  gridLayout.SpanCount = (int)size; 
         
  listView.LayoutManager = gridLayout; 
      } 
  }

If you still facing the issue , please share the details of
ContentPage and listview details which will be more helpful for us to find the
solution as soon as possible.Regards,Suthi Yuvaraj.