[android-developers] Re: setXfermode not working on pre-ICS

I forgot:

Initialization of pTouch (used in onDraw()):

pTouch = new Paint(Paint.ANTI_ALIAS_FLAG);         

pTouch.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT)); 

pTouch.setColor(Color.TRANSPARENT);

pTouch.setMaskFilter(new BlurMaskFilter(25, Blur.NORMAL));

Am Samstag, 20. April 2013 11:07:16 UTC+2 schrieb user123:

I have 2 images, one on top of the other. I paint a circle in the front-image with xfermode to let the image bellow show through.

I realized this with 2 views in a RelativeLayout. The front-view acts as "mask" and is a custom view. 

The problem: Works well in 4.x, but on 2.x the circle is black, instead of transparent.

The code:

@Override

public void onDraw(Canvas canvas){

super.onDraw(canvas);

c2.drawCircle(X, Y, 50, pTouch);

Paint new_paint = new Paint();

new_paint.setXfermode(new PorterDuffXfermode(Mode.SRC_ATOP));

rect.set (0, 0, getWidth(), getHeight());

canvas.drawBitmap(overlay, null, rect, new_paint);

}

And c2 was initialized to a canvas with bitmap "overlay", like this:

Bitmap overlay;

BitmapFactory.Options options = new BitmapFactory.Options();

options.inScaled = false;

overlay = BitmapFactory.decodeResource(getResources(), R.drawable.overlay, options);

//...

overlay = Bitmap.createScaledBitmap(overlay, newWidth, newHeight, false);

c2 = new Canvas(overlay);

Paint filterPaint = new Paint();

filterPaint.setColorFilter(new PorterDuffColorFilter(0xff000022,  PorterDuff.Mode.SRC_ATOP));

rect.set (0, 0, w, h);

c2.drawBitmap(overlay, null, rect, filterPaint);

Thanks!

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