I have a background image that takes up the whole screen. I am drawing canvas over the background and setting its color to white so you can't see the image yet. What I am trying to achieve is to then draw a transparent shape onto the white canvas and have the background image show through where that shape is. I am using a surfaceView and implementing SurfaceView.Callback
.
to draw transparent shape follow this code
Paint paint = new Paint();
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
//draw any shape, here I am drawing Rect shape
Rect rect=new Rect(left, top, right, bottom);
canvas.drawRect(rect,paint);
You should make the white color transparent:
public void draw(Canvas canvas)
{
final RectF rectF = new RectF();
final Paint paint = new Paint();
paint.setARGB(128, 255, 255, 255);
rectF.set(0,0, getMeasuredWidth(), getMeasuredHeight());
canvas.drawRect(rectF, paint);
}
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