Android Question How I can trap errors using LoadBitmap?

[Reproretro]

I have a number of small images in dirassets as a sort of cache. I read the name of the required image from HTML then attempt to load it from dirassets, e.g.:
Pic1.bitmap=LoadBitmap(File.dirassets, PicName)

The idea being that I read it form the website only if I have to.
How do I tell if the image already exists?

 

[Roycefer]

If File.Exists(File.DirAssets, "myimage.png") Then
        Pic1.Bitmap = LoadBitmap(File.DirAssets, "myimage.png")
Else
        Pic1.Bitmap = DownloadImage
End If

 

[Reproretro]

Thank you.