Why not Bitmap displayed in ImageView?

I have added the images files to FileManager tab, and my code is:

Code:

  Sub Globals
'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.

Private HSV_TOP_BAR As HorizontalScrollView
Private button1 As ImageView
End Sub

Sub Activity_Create(FirstTime As Boolean)
'Do not forget to load the layout file created with the visual designer. For example:
    'Activity.LoadLayout("Layout1")...  

Why not Bitmap displayed in ImageView?

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