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public void clear() { Paint paint = new Paint(); paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR)); canvas.drawPaint(paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC)); invalidate(); }
详细请看：http://trylovecatch.iteye.com/blog/1189452
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原文地址：http://www.cnblogs.com/csxcode/p/4174405.html
