Android transparent canvas (surfaceview)

Question

I\'ve got a panel which is placed on top of another view via a relativelayout.

I would like to give this panel a transparent background, but didn\'t find the correct

Answer 1

In the constructor:

setZOrderOnTop(true);

After holder.addCallback(this):

holder.setFormat(PixelFormat.TRANSPARENT);

At the beginning of drawing:

canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);

Answer 2

Try this:

getHolder().setFormat(PixelFormat.TRANSLUCENT);

Answer 3

After searching with keyword surfaceview instead of canvas iI found out that it isn't possible. For more information see: how to make surfaceview transparent

Because the background of the canvas is static I've gave it the exact same background. Now it looks like it is transparent :)

    Bitmap bg = BitmapFactory.decodeResource(getResources(), R.drawable.background_panel_800_480);
    canvas.drawBitmap(bg, 0, 0, null);

Answer 4

I copied the solution from the same question: how to make surfaceview transparent and got it to work with a setup similar to yours.

The critical piece for me was the 'setZOrderOnTop(true)' setting, which I foolishly ignored on the first pass. I put that in the constructor, and set my pixel format to RGBA_8888 inside surfaceCreated.

At this point, the background from the top-level layout was visible.