Android Question Why not Bitmap displayed in ImageView?

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

    Private button_width As Float

    Private HSV_TOP_BAR As HorizontalScrollView
    Private button1 As ImageView  ' Not created with the Designer   
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")
    Activity.LoadLayout("mainLayout")
    button1.Initialize("button1")
    button1.Color=Colors.ARGB(255,0,255,0) 'worked well
   
    button_width=HSV_TOP_BAR.Height
   
    Log(button_width)
           
    HSV_TOP_BAR.Panel.AddView(button1,0,0,button_width,button_width)   
   
    Dim bmp As Bitmap=LoadBitmap(File.DirAssets,"move_left.png")       
    Log(bmp)       
    Dim r1,r2 As Rect
    r1.Initialize(0,0,bmp.Width,bmp.Height)
    r2.Initialize(0,0,button_width,button_width)
   
    Dim c As Canvas
    c.Initialize(button1)
    c.DrawBitmap(bmp,r1,r2)  '<-- HaHa , OK !
       
   
    'Causes: When ImageView is created with code dynamically, assigns to its Bitmap property not work.
    'button1.Bitmap=bmp'LoadBitmapSample(File.DirAssets,"move_left.png",128,128)  '<-- not work!
    'button1.Bitmap=LoadBitmap(File.DirAssets,"move_left.png")    '<-- not work!
   
    'bmp=LoadBitmap(File.DirAssets,"move_left.png")
    'Log(bmp)  'Load success.
    'button1.SetBackgroundImage(bmp)  '<-- not work
   
    'ImageView1.Bitmap=bmp
    'HSV_TOP_BAR.Panel.AddView(ImageView1,130,0,100%x/5,100%y)

End Sub