DrawText not appearing?

[PenguinHero]

Hi All,

I wanted to create a Gradient on a panel, and then write text to it.
I found a couple of different bits of code here on the forums and from the beginners guide. But when I combine them it doesn't work.

This is the code I'm using, and I tried it on both my device (a Kindle Fire) and on the virtual device. In both tests I get the gradient but no text.

I don't get any errors, but I'm guessing I've broken some coding rule?
Or is the text appearing somewhere I can't see? Like under the panel?

What am I doing wrong?

Sub Globals
  Dim pnlTest As Panel
  Dim csvTest As Canvas
  Dim gdwGradient As GradientDrawable
  Dim Cols(2) As Int
End Sub

Sub Activity_Create(FirstTime As Boolean)

  pnlTest.Initialize("pnlTest")
  Activity.AddView(pnlTest, 0, 0, 100%x, 100%y)
  csvTest.Initialize(pnlTest)
  
  Cols(0) = Colors.RGB(112,255,148)
  Cols(1) = Colors.White
  gdwGradient.Initialize("TOP_BOTTOM", Cols)
  gdwGradient.CornerRadius = 10dip
  pnlTest.Background = gdwGradient
  
  csvTest.DrawText( "Test", 25dip, 25dip, Typeface.DEFAULT, 30, Colors.Blue, "LEFT")

End Sub

Thanks.

 

[thedesolatesoul]

Add pnlTest.Invalidate after drawing on it.

 

[PenguinHero]

Add pnlTest.Invalidate after drawing on it.

I tried that and it made no difference.

And the example that I got the DrawText from (that works fine for me) in the guide/tutorial (SimpleDrawFunctions) doesn't seem to call it either, except when it calls DrawCircle.

Is it something else?

 

[Erel]

The problem is that you are setting the panel's background after you initialize the canvas.

The canvas continues to draw on the original background. You should first set the background and then initialize the canvas.

 

[PenguinHero]

Thanks Erel, that fixed it.

 

[Erel]

Note that it is required to call Invalidate after you finish drawing. In this specific case it will also work without calling this method as the panel was not drawn yet to the screen.