Android Code Snippet [B4X] Use WebView to show large images

Better to use: [B4X] HugeImageView - show very large images

Depends on: XUI and JavaObject.

'xui is a global XUI object.
Private Sub ShowImage(WV As WebView, Dir As String, FileName As String)
#if B4A
    Dim jo As JavaObject = Me
    jo.InitializeContext 'comment this line if calling this code from class
    jo.RunMethod("zoom", Array(WV))
#End If
    If xui.IsB4J Then
        WV.LoadHtml($"<img src="${xui.FileUri(Dir, FileName)}"/>"$)
    Else
        If Dir = File.DirAssets Then FileName = FileName.ToLowerCase
        If xui.IsB4A Or Dir = File.DirAssets Then
            WV.LoadHtml($"<img src="${xui.FileUri(Dir, FileName)}"/>"$)
        Else
            WV.LoadUrl("file://" & File.Combine(Dir, FileName))
        End If
    End If
End Sub

#if B4A
#if Java
public void zoom(android.webkit.WebView wv) {
   wv.getSettings().setUseWideViewPort(true);
   wv.setInitialScale(1);
}
#End If
#End If

The inline java is required to start zoomed out.

Don't miss the bottom of the code snippet. Scroll it down.

 

[Erel]

I've updated the code snippet. The update is required to support the new underlying WKWebView control which replaced UIWebView in B4i.
It also works with B4J.

 

[Erel]

Updated the code to handle classes and activities in B4A. Note that you need to comment the jo.InitializeContext line when using this code from a class.