Android PorterDuffXfermode on ICS

android, android-4.0-ice-cream-sandwich, paint

Solution

You need to disable Hardware Acceleration for that particular `View`. See the Hardware Acceleration - Unsupported Drawing Operations section for more details, and also for information on how to disable Hardware Acceleration selectively. For example:

myView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);

Problem

there is some code that works perfectly on Android 2.2, but in Android 4 produces only a black view. That is the onDraw method: ``` //Object initialization Paint paint=new Paint(); PorterDuffXfermode exclude=new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT); paint.setAntiAlias(true); paint.setDither(true); //The dimensions are OK and they are at the center of the screen canvas.drawBitmap(mask, screenWidth / 2 - pixelsToSp(100), screenHeight / 2 - pixelsToSp(100), paint); paint.setXfermode(exclude); //PS:targetRect is a portion of screen canvas.drawBitmap(source, null, targetRect, p); paint.setXfermode(null); ``` PS: mask and spotlight are two bitmap. Without setting Xfermode to paint the two bitmap are drawn (incorrectly for my scope, but drawn in the right place and with the right size)

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