The constructor Argument radius should be a float value, calling as 10 passes an int, change the code to:
Dim pathEffect As JavaObject
Dim Radius As Float = 10
pathEffect.InitializeNewInstance("android.graphics.CornerPathEffect",Array(Radius))
Code:
Dim pathEffect As JavaObject
Dim Radius As Float = 10
pathEffect.InitializeNewInstance("android.graphics.CornerPathEffect",Array(Radius))