Question

I have a view I need to flip vertically, or mirror. There’s plenty of information out there about mirroring a single bitmap by scaling it by -1 and translating for the offset, as described here, but there doesn’t seem to be any information on how to draw all the contents of a View – specifically, all of it’s subviews – upside down.

I have multiple subviews in this container – text, images – and I was hoping for a way that would let me just add them to a single View and draw that View upside down/sideways, rather than having them all perform custom drawing code to draw them upside down and have the container reposition them all appropriately. Any ideas?

Answer 1

You could simply create a Canvas out of a Bitmap and then invoke your root view’s View.draw(Canvas) method. This will give you a snapshot of the view hierarchy in a Bitmap. You then apply the aforementioned transformations to mirror the image.