CODEWITHSUNDEEP
androidsurfaceviewtransparent
Vlad
Vlad

Reputation: 755

Placing an ImageView over a transparent SurfaceView

I have a SurfaceView with a transparent background, on which i draw stuff, and on top of that i want an ImageView to be drawn. In order for the SurfaceView to be transparent i have to set surfaceView.setZOrderOnTop(true), but the problem is that now, my surfaceview's canvas is drawn on top of the imageview, which makes sense because of setZOrderOnTop(true).
My question is, is there a way to achieve what i want? a SurfaceView with transparent background and an ImageView on top of it?

Thanks, Vlad

Edit: Ok so this isn't possible. See fadden's answer below, or https://www.youtube.com/watch?v=duefsFTJXzc&feature=feedwll&list=WL for deeper understanding.

Upvotes: 2

Views: 1928

Answers (2)

Derzu
Derzu

Reputation: 7146

You can do that placing the ImageView inside a PopupWindow. It can come from an xml layout.

Example:

View popupView = layoutInflater.inflate(R.layout.popuplayout, null);
PopupWindow myPopup = new PopupWindow(popupView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
myPopup.setOutsideTouchable(true);
myPopup.showAtLocation(rootView, Gravity.TOP | Gravity.LEFT, 100, 100);

Where 100, 100 is your x, y position.

Upvotes: 0

fadden
fadden

Reputation: 52313

You can't do what you want with a single SurfaceView.

All Views are composed onto a single layer. The SurfaceView has two parts, the "View" part (which is just a transparent place-holder) and the "Surface" part. The latter is a completely separate layer.

So you can put the "Surface" part above all other Views or below all other Views, but you can't put it in between. A TextureView will do what you want, but you need to be using API 14+ for that.

You can, however, have more than one SurfaceView, and put the "Surface" layers at different Z-levels. There are good reasons not to do this -- once you have more than N surfaces the system compositor may switch to a less-efficient operating mode -- but it's possible. See the "Multi-surface test" in Grafika for an example.

Upvotes: 2

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