Android Code Snippet [B4X] Adding ImageViews above HugeImageView

Step 1: add an Updated event at the end of HugeImageView.SetImageViewLayout:

CallSub(mCallBack, mEventName & "_Updated")

Step 2: in the page class

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    Private HugeImageView1 As HugeImageView
    Private ImageView1 As B4XView
    Private ImageView1LayoutInPercentage As B4XRect
End Sub

Public Sub Initialize
End Sub

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
    'Left - 10%, Top - 10%, Right - 20%, Bottom - 20%
    ImageView1LayoutInPercentage.Initialize(0.10, 0.10, 0.20, 0.20) 'ignore (these are not pixels so we don't need dip units).
    HugeImageView1.SetBitmap(File.DirAssets, "CCI20210918.jpg")
    XUIViewsUtils.SetBitmapAndFill(ImageView1, xui.LoadBitmap(File.DirAssets, "logo.png"))
End Sub

Public Sub HugeImageView1_Updated
    UpdateImageViewBasedOnRect(ImageView1, ImageView1LayoutInPercentage)
End Sub

Private Sub UpdateImageViewBasedOnRect(ImageView As B4XView, PercentageRect As B4XRect)
    Dim ZoomOutLeft As Int = HugeImageView1.mBase.Left + HugeImageView1.pnlBackground.Left + HugeImageView1.ZoomOutImageView.Left
    Dim ZoomOutTop As Int = HugeImageView1.mBase.Top + HugeImageView1.pnlBackground.Top + HugeImageView1.ZoomOutImageView.Top
    ImageView.Left = ZoomOutLeft + PercentageRect.Left * HugeImageView1.ZoomOutImageView.Width
    ImageView.Top = ZoomOutTop + PercentageRect.Top * HugeImageView1.ZoomOutImageView.Height
    ImageView.Width = PercentageRect.Width * HugeImageView1.ZoomOutImageView.Width
    ImageView.Height = PercentageRect.Height * HugeImageView1.ZoomOutImageView.Height
End Sub

The new ImageViews position and size are relative to the huge image. They will move and zoom together with the large image.